Add Q_DECL_OVERRIDE in the src subdirectory

Done automatically with clang-modernize on linux (But does not add Q_DECL_OVERRIDE to the function that are marked as inline because it a compilation error with MSVC2010) Change-Id: I2196ee26e3e6fe20816834ecea5ea389eeab3171 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
author: Olivier Goffart <ogoffart@woboq.com> 2014-11-16 13:09:01 +0100
committer: Olivier Goffart <ogoffart@woboq.com> 2014-12-03 09:57:11 +0100
commit: 5180f32c5abe01acd65cde68c2c16aedda4028ec (patch)
tree: a8ed3b4af80751cdc0442c750f2915bfa9c8af40 /src/widgets
parent: 2e271795e7c460254a27ea617846ff7b598a7b9b (diff)
169 files changed, 1464 insertions, 1464 deletions
diff --git a/src/widgets/accessible/complexwidgets.cpp b/src/widgets/accessible/complexwidgets.cpp
index 30f9ccb1f4..1945fd8416 100644
--- a/src/widgets/accessible/complexwidgets.cpp
+++ b/src/widgets/accessible/complexwidgets.cpp
@@ -77,16 +77,16 @@ public:
         : m_parent(parent), m_index(index)
     {}
 
-    void *interface_cast(QAccessible::InterfaceType t) {
+    void *interface_cast(QAccessible::InterfaceType t) Q_DECL_OVERRIDE {
         if (t == QAccessible::ActionInterface) {
             return static_cast<QAccessibleActionInterface*>(this);
         }
         return 0;
     }
 
-    QObject *object() const { return 0; }
-    QAccessible::Role role() const { return QAccessible::PageTab; }
-    QAccessible::State state() const {
+    QObject *object() const Q_DECL_OVERRIDE { return 0; }
+    QAccessible::Role role() const Q_DECL_OVERRIDE { return QAccessible::PageTab; }
+    QAccessible::State state() const Q_DECL_OVERRIDE {
         if (!isValid()) {
             QAccessible::State s;
             s.invalid = true;
@@ -94,7 +94,7 @@ public:
         }
         return parent()->state();
     }
-    QRect rect() const {
+    QRect rect() const Q_DECL_OVERRIDE {
         if (!isValid())
             return QRect();
 
@@ -104,13 +104,13 @@ public:
         return rec;
     }
 
-    bool isValid() const { return m_parent.data() && m_parent->count() > m_index; }
+    bool isValid() const Q_DECL_OVERRIDE { return m_parent.data() && m_parent->count() > m_index; }
 
-    QAccessibleInterface *childAt(int, int) const { return 0; }
-    int childCount() const { return 0; }
-    int indexOfChild(const QAccessibleInterface *) const  { return -1; }
+    QAccessibleInterface *childAt(int, int) const Q_DECL_OVERRIDE { return 0; }
+    int childCount() const Q_DECL_OVERRIDE { return 0; }
+    int indexOfChild(const QAccessibleInterface *) const Q_DECL_OVERRIDE  { return -1; }
 
-    QString text(QAccessible::Text t) const
+    QString text(QAccessible::Text t) const Q_DECL_OVERRIDE
     {
         if (!isValid())
             return QString();
@@ -129,26 +129,26 @@ public:
         return QString();
     }
 
-    void setText(QAccessible::Text, const QString &) {}
+    void setText(QAccessible::Text, const QString &) Q_DECL_OVERRIDE {}
 
-    QAccessibleInterface *parent() const {
+    QAccessibleInterface *parent() const Q_DECL_OVERRIDE {
         return QAccessible::queryAccessibleInterface(m_parent.data());
     }
-    QAccessibleInterface *child(int) const { return 0; }
+    QAccessibleInterface *child(int) const Q_DECL_OVERRIDE { return 0; }
 
     // action interface
-    QStringList actionNames() const
+    QStringList actionNames() const Q_DECL_OVERRIDE
     {
         return QStringList(pressAction());
     }
 
-    void doAction(const QString &actionName)
+    void doAction(const QString &actionName) Q_DECL_OVERRIDE
     {
         if (isValid() && actionName == pressAction())
             m_parent->setCurrentIndex(m_index);
     }
 
-    QStringList keyBindingsForAction(const QString &) const
+    QStringList keyBindingsForAction(const QString &) const Q_DECL_OVERRIDE
     {
         return QStringList();
     }
diff --git a/src/widgets/accessible/qaccessiblewidgets.h b/src/widgets/accessible/qaccessiblewidgets.h
index b2459fe71e..50a01be397 100644
--- a/src/widgets/accessible/qaccessiblewidgets.h
+++ b/src/widgets/accessible/qaccessiblewidgets.h
@@ -67,7 +67,7 @@ class QAccessibleTextWidget : public QAccessibleWidget,
 public:
     QAccessibleTextWidget(QWidget *o, QAccessible::Role r = QAccessible::EditableText, const QString &name = QString());
 
-    QAccessible::State state() const;
+    QAccessible::State state() const Q_DECL_OVERRIDE;
 
     // QAccessibleTextInterface
     //  selection
@@ -89,7 +89,7 @@ public:
                             int *startOffset, int *endOffset) const Q_DECL_OVERRIDE;
     QString textAtOffset(int offset, QAccessible::TextBoundaryType boundaryType,
                          int *startOffset, int *endOffset) const Q_DECL_OVERRIDE;
-    int characterCount() const;
+    int characterCount() const Q_DECL_OVERRIDE;
 
     // character <-> geometry
     QRect characterRect(int offset) const Q_DECL_OVERRIDE;
diff --git a/src/widgets/dialogs/qcolordialog.cpp b/src/widgets/dialogs/qcolordialog.cpp
index b92e1a24ad..45cde3c966 100644
--- a/src/widgets/dialogs/qcolordialog.cpp
+++ b/src/widgets/dialogs/qcolordialog.cpp
@@ -83,7 +83,7 @@ public:
     virtual void setCurrent(int row, int col);
     virtual void setSelected(int row, int col);
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     virtual void setCellBrush(int row, int col, const QBrush &);
     QBrush cellBrush(int row, int col);
@@ -136,12 +136,12 @@ protected:
     virtual void paintCell(QPainter *, int row, int col, const QRect&);
     virtual void paintCellContents(QPainter *, int row, int col, const QRect&);
 
-    void mousePressEvent(QMouseEvent*);
-    void mouseReleaseEvent(QMouseEvent*);
-    void keyPressEvent(QKeyEvent*);
-    void focusInEvent(QFocusEvent*);
-    void focusOutEvent(QFocusEvent*);
-    void paintEvent(QPaintEvent *);
+    void mousePressEvent(QMouseEvent*) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent*) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent*) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent*) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent*) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QWellArray)
@@ -513,15 +513,15 @@ public:
     { setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum)); }
 
 protected:
-    void paintCellContents(QPainter *, int row, int col, const QRect&);
-    void mousePressEvent(QMouseEvent *e);
-    void mouseMoveEvent(QMouseEvent *e);
-    void mouseReleaseEvent(QMouseEvent *e);
+    void paintCellContents(QPainter *, int row, int col, const QRect&) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void dragEnterEvent(QDragEnterEvent *e);
-    void dragLeaveEvent(QDragLeaveEvent *e);
-    void dragMoveEvent(QDragMoveEvent *e);
-    void dropEvent(QDropEvent *e);
+    void dragEnterEvent(QDragEnterEvent *e) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *e) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QDragMoveEvent *e) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *e) Q_DECL_OVERRIDE;
 #endif
 
 private:
@@ -634,11 +634,11 @@ signals:
     void newCol(int h, int s);
 
 protected:
-    QSize sizeHint() const;
-    void paintEvent(QPaintEvent*);
-    void mouseMoveEvent(QMouseEvent *);
-    void mousePressEvent(QMouseEvent *);
-    void resizeEvent(QResizeEvent *);
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent*) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
 
 private:
     int hue;
@@ -670,9 +670,9 @@ signals:
     void newHsv(int h, int s, int v);
 
 protected:
-    void paintEvent(QPaintEvent*);
-    void mouseMoveEvent(QMouseEvent *);
-    void mousePressEvent(QMouseEvent *);
+    void paintEvent(QPaintEvent*) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
 
 private:
     enum { foff = 3, coff = 4 }; //frame and contents offset
@@ -981,14 +981,14 @@ signals:
     void colorDropped(QRgb);
 
 protected:
-    void paintEvent(QPaintEvent *);
-    void mousePressEvent(QMouseEvent *e);
-    void mouseMoveEvent(QMouseEvent *e);
-    void mouseReleaseEvent(QMouseEvent *e);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void dragEnterEvent(QDragEnterEvent *e);
-    void dragLeaveEvent(QDragLeaveEvent *e);
-    void dropEvent(QDropEvent *e);
+    void dragEnterEvent(QDragEnterEvent *e) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *e) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *e) Q_DECL_OVERRIDE;
 #endif
 
 private:
diff --git a/src/widgets/dialogs/qcolordialog.h b/src/widgets/dialogs/qcolordialog.h
index d23254a2b2..0f97cdd8c0 100644
--- a/src/widgets/dialogs/qcolordialog.h
+++ b/src/widgets/dialogs/qcolordialog.h
@@ -82,7 +82,7 @@ public:
 #endif
     void open(QObject *receiver, const char *member);
 
-    void setVisible(bool visible);
+    void setVisible(bool visible) Q_DECL_OVERRIDE;
 
     static QColor getColor(const QColor &initial = Qt::white,
                            QWidget *parent = 0,
@@ -103,8 +103,8 @@ Q_SIGNALS:
     void colorSelected(const QColor &color);
 
 protected:
-    void changeEvent(QEvent *event);
-    void done(int result);
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void done(int result) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QColorDialog)
diff --git a/src/widgets/dialogs/qcolordialog_p.h b/src/widgets/dialogs/qcolordialog_p.h
index af3ebe8925..c2d6f48f49 100644
--- a/src/widgets/dialogs/qcolordialog_p.h
+++ b/src/widgets/dialogs/qcolordialog_p.h
@@ -109,7 +109,7 @@ public:
     bool handleColorPickingMouseButtonRelease(QMouseEvent *e);
     bool handleColorPickingKeyPress(QKeyEvent *e);
 
-    bool canBeNativeDialog() const;
+    bool canBeNativeDialog() const Q_DECL_OVERRIDE;
 
     QWellArray *custom;
     QWellArray *standard;
@@ -155,8 +155,8 @@ public:
     void mac_nativeDialogModalHelp();
 #endif
 private:
-    virtual void initHelper(QPlatformDialogHelper *h);
-    virtual void helperPrepareShow(QPlatformDialogHelper *h);
+    virtual void initHelper(QPlatformDialogHelper *h) Q_DECL_OVERRIDE;
+    virtual void helperPrepareShow(QPlatformDialogHelper *h) Q_DECL_OVERRIDE;
 };
 
 #endif // QT_NO_COLORDIALOG
diff --git a/src/widgets/dialogs/qerrormessage.cpp b/src/widgets/dialogs/qerrormessage.cpp
index 6bab921d21..65da7e3928 100644
--- a/src/widgets/dialogs/qerrormessage.cpp
+++ b/src/widgets/dialogs/qerrormessage.cpp
@@ -84,8 +84,8 @@ public:
     QErrorMessageTextView(QWidget *parent)
         : QTextEdit(parent) { setReadOnly(true); }
 
-    virtual QSize minimumSizeHint() const;
-    virtual QSize sizeHint() const;
+    virtual QSize minimumSizeHint() const Q_DECL_OVERRIDE;
+    virtual QSize sizeHint() const Q_DECL_OVERRIDE;
 };
 
 QSize QErrorMessageTextView::minimumSizeHint() const
diff --git a/src/widgets/dialogs/qerrormessage.h b/src/widgets/dialogs/qerrormessage.h
index 0925923d96..301fbc7f8d 100644
--- a/src/widgets/dialogs/qerrormessage.h
+++ b/src/widgets/dialogs/qerrormessage.h
@@ -58,8 +58,8 @@ public Q_SLOTS:
     void showMessage(const QString &message, const QString &type);
 
 protected:
-    void done(int);
-    void changeEvent(QEvent *e);
+    void done(int) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QErrorMessage)
diff --git a/src/widgets/dialogs/qfiledialog.h b/src/widgets/dialogs/qfiledialog.h
index 70e498a2cd..12434ad944 100644
--- a/src/widgets/dialogs/qfiledialog.h
+++ b/src/widgets/dialogs/qfiledialog.h
@@ -180,7 +180,7 @@ public:
     using QDialog::open;
 #endif
     void open(QObject *receiver, const char *member);
-    void setVisible(bool visible);
+    void setVisible(bool visible) Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void fileSelected(const QString &file);
@@ -256,9 +256,9 @@ public:
 
 protected:
     QFileDialog(const QFileDialogArgs &args);
-    void done(int result);
-    void accept();
-    void changeEvent(QEvent *e);
+    void done(int result) Q_DECL_OVERRIDE;
+    void accept() Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QFileDialog)
diff --git a/src/widgets/dialogs/qfiledialog_p.h b/src/widgets/dialogs/qfiledialog_p.h
index cc2f481eb9..991d2a0f7a 100644
--- a/src/widgets/dialogs/qfiledialog_p.h
+++ b/src/widgets/dialogs/qfiledialog_p.h
@@ -243,7 +243,7 @@ public:
     // setVisible_sys returns true if it ends up showing a native
     // dialog. Returning false means that a non-native dialog must be
     // used instead.
-    bool canBeNativeDialog() const;
+    bool canBeNativeDialog() const Q_DECL_OVERRIDE;
     inline bool usingWidgets() const;
 
     void setDirectory_sys(const QUrl &directory);
@@ -273,9 +273,9 @@ public:
     ~QFileDialogPrivate();
 
 private:
-    virtual void initHelper(QPlatformDialogHelper *);
-    virtual void helperPrepareShow(QPlatformDialogHelper *);
-    virtual void helperDone(QDialog::DialogCode, QPlatformDialogHelper *);
+    virtual void initHelper(QPlatformDialogHelper *) Q_DECL_OVERRIDE;
+    virtual void helperPrepareShow(QPlatformDialogHelper *) Q_DECL_OVERRIDE;
+    virtual void helperDone(QDialog::DialogCode, QPlatformDialogHelper *) Q_DECL_OVERRIDE;
 
     Q_DISABLE_COPY(QFileDialogPrivate)
 };
@@ -285,7 +285,7 @@ class QFileDialogLineEdit : public QLineEdit
 public:
     QFileDialogLineEdit(QWidget *parent = 0) : QLineEdit(parent), d_ptr(0){}
     void setFileDialogPrivate(QFileDialogPrivate *d_pointer) {d_ptr = d_pointer; }
-    void keyPressEvent(QKeyEvent *e);
+    void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
     bool hideOnEsc;
 private:
     QFileDialogPrivate *d_ptr;
@@ -296,10 +296,10 @@ class QFileDialogComboBox : public QComboBox
 public:
     QFileDialogComboBox(QWidget *parent = 0) : QComboBox(parent), urlModel(0) {}
     void setFileDialogPrivate(QFileDialogPrivate *d_pointer);
-    void showPopup();
+    void showPopup() Q_DECL_OVERRIDE;
     void setHistory(const QStringList &paths);
     QStringList history() const { return m_history; }
-    void paintEvent(QPaintEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 
 private:
     QUrlModel *urlModel;
@@ -312,9 +312,9 @@ class QFileDialogListView : public QListView
 public:
     QFileDialogListView(QWidget *parent = 0);
     void setFileDialogPrivate(QFileDialogPrivate *d_pointer);
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 protected:
-    void keyPressEvent(QKeyEvent *e);
+    void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
 private:
     QFileDialogPrivate *d_ptr;
 };
@@ -324,10 +324,10 @@ class QFileDialogTreeView : public QTreeView
 public:
     QFileDialogTreeView(QWidget *parent);
     void setFileDialogPrivate(QFileDialogPrivate *d_pointer);
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 protected:
-    void keyPressEvent(QKeyEvent *e);
+    void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
 private:
     QFileDialogPrivate *d_ptr;
 };
diff --git a/src/widgets/dialogs/qfilesystemmodel.h b/src/widgets/dialogs/qfilesystemmodel.h
index bde699d2a0..28c5660080 100644
--- a/src/widgets/dialogs/qfilesystemmodel.h
+++ b/src/widgets/dialogs/qfilesystemmodel.h
@@ -72,31 +72,31 @@ public:
     explicit QFileSystemModel(QObject *parent = 0);
     ~QFileSystemModel();
 
-    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
     QModelIndex index(const QString &path, int column = 0) const;
-    QModelIndex parent(const QModelIndex &child) const;
-    bool hasChildren(const QModelIndex &parent = QModelIndex()) const;
-    bool canFetchMore(const QModelIndex &parent) const;
-    void fetchMore(const QModelIndex &parent);
+    QModelIndex parent(const QModelIndex &child) const Q_DECL_OVERRIDE;
+    bool hasChildren(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    bool canFetchMore(const QModelIndex &parent) const Q_DECL_OVERRIDE;
+    void fetchMore(const QModelIndex &parent) Q_DECL_OVERRIDE;
 
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
 
     QVariant myComputer(int role = Qt::DisplayRole) const;
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
-    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
+    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) Q_DECL_OVERRIDE;
 
-    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
 
-    Qt::ItemFlags flags(const QModelIndex &index) const;
+    Qt::ItemFlags flags(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);
+    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder) Q_DECL_OVERRIDE;
 
-    QStringList mimeTypes() const;
-    QMimeData *mimeData(const QModelIndexList &indexes) const;
+    QStringList mimeTypes() const Q_DECL_OVERRIDE;
+    QMimeData *mimeData(const QModelIndexList &indexes) const Q_DECL_OVERRIDE;
     bool dropMimeData(const QMimeData *data, Qt::DropAction action,
-                      int row, int column, const QModelIndex &parent);
-    Qt::DropActions supportedDropActions() const;
+                      int row, int column, const QModelIndex &parent) Q_DECL_OVERRIDE;
+    Qt::DropActions supportedDropActions() const Q_DECL_OVERRIDE;
 
     // QFileSystemModel specific API
     QModelIndex setRootPath(const QString &path);
@@ -137,8 +137,8 @@ public:
 
 protected:
     QFileSystemModel(QFileSystemModelPrivate &, QObject *parent = 0);
-    void timerEvent(QTimerEvent *event);
-    bool event(QEvent *event);
+    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QFileSystemModel)
diff --git a/src/widgets/dialogs/qfontdialog.cpp b/src/widgets/dialogs/qfontdialog.cpp
index d12b109d9f..5294e78bfe 100644
--- a/src/widgets/dialogs/qfontdialog.cpp
+++ b/src/widgets/dialogs/qfontdialog.cpp
@@ -84,7 +84,7 @@ public:
         int row = QListView::currentIndex().row();
         return row < 0 ? QString() : model()->stringList().at(row);
     }
-    void currentChanged(const QModelIndex &current, const QModelIndex &previous) {
+    void currentChanged(const QModelIndex &current, const QModelIndex &previous) Q_DECL_OVERRIDE {
         QListView::currentChanged(current, previous);
         if (current.isValid())
             emit highlighted(current.row());
diff --git a/src/widgets/dialogs/qfontdialog.h b/src/widgets/dialogs/qfontdialog.h
index 455b5d3f3e..b07655a3da 100644
--- a/src/widgets/dialogs/qfontdialog.h
+++ b/src/widgets/dialogs/qfontdialog.h
@@ -88,7 +88,7 @@ public:
 #endif
     void open(QObject *receiver, const char *member);
 
-    void setVisible(bool visible);
+    void setVisible(bool visible) Q_DECL_OVERRIDE;
 
     static QFont getFont(bool *ok, QWidget *parent = 0);
     static QFont getFont(bool *ok, const QFont &initial, QWidget *parent = 0, const QString &title = QString(),
@@ -99,9 +99,9 @@ Q_SIGNALS:
     void fontSelected(const QFont &font);
 
 protected:
-    void changeEvent(QEvent *event);
-    void done(int result);
-    bool eventFilter(QObject *object, QEvent *event);
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void done(int result) Q_DECL_OVERRIDE;
+    bool eventFilter(QObject *object, QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QFontDialog)
diff --git a/src/widgets/dialogs/qfontdialog_p.h b/src/widgets/dialogs/qfontdialog_p.h
index 3af6f9f29a..9e6adfbf27 100644
--- a/src/widgets/dialogs/qfontdialog_p.h
+++ b/src/widgets/dialogs/qfontdialog_p.h
@@ -135,12 +135,12 @@ public:
     QPointer<QObject> receiverToDisconnectOnClose;
     QByteArray memberToDisconnectOnClose;
 
-    bool canBeNativeDialog() const;
+    bool canBeNativeDialog() const Q_DECL_OVERRIDE;
     void _q_runNativeAppModalPanel();
 
 private:
-    virtual void initHelper(QPlatformDialogHelper *);
-    virtual void helperPrepareShow(QPlatformDialogHelper *);
+    virtual void initHelper(QPlatformDialogHelper *) Q_DECL_OVERRIDE;
+    virtual void helperPrepareShow(QPlatformDialogHelper *) Q_DECL_OVERRIDE;
 };
 
 #endif // QT_NO_FONTDIALOG
diff --git a/src/widgets/dialogs/qfscompleter_p.h b/src/widgets/dialogs/qfscompleter_p.h
index a5871e34f7..4a75f59f26 100644
--- a/src/widgets/dialogs/qfscompleter_p.h
+++ b/src/widgets/dialogs/qfscompleter_p.h
@@ -62,8 +62,8 @@ public:
         setCaseSensitivity(Qt::CaseInsensitive);
 #endif
     }
-    QString pathFromIndex(const QModelIndex &index) const;
-    QStringList splitPath(const QString& path) const;
+    QString pathFromIndex(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    QStringList splitPath(const QString& path) const Q_DECL_OVERRIDE;
 
     QAbstractProxyModel *proxyModel;
     QFileSystemModel *sourceModel;
diff --git a/src/widgets/dialogs/qinputdialog.cpp b/src/widgets/dialogs/qinputdialog.cpp
index b52cebadfa..67ed741159 100644
--- a/src/widgets/dialogs/qinputdialog.cpp
+++ b/src/widgets/dialogs/qinputdialog.cpp
@@ -111,7 +111,7 @@ private slots:
     void notifyTextChanged() { emit textChanged(hasAcceptableInput()); }
 
 private:
-    void keyPressEvent(QKeyEvent *event) {
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE {
         if ((event->key() == Qt::Key_Return || event->key() == Qt::Key_Enter) && !hasAcceptableInput()) {
 #ifndef QT_NO_PROPERTIES
             setProperty("value", property("value"));
@@ -122,7 +122,7 @@ private:
         notifyTextChanged();
     }
 
-    void mousePressEvent(QMouseEvent *event) {
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE {
         QSpinBox::mousePressEvent(event);
         notifyTextChanged();
     }
@@ -146,7 +146,7 @@ private slots:
     void notifyTextChanged() { emit textChanged(hasAcceptableInput()); }
 
 private:
-    void keyPressEvent(QKeyEvent *event) {
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE {
         if ((event->key() == Qt::Key_Return || event->key() == Qt::Key_Enter) && !hasAcceptableInput()) {
 #ifndef QT_NO_PROPERTIES
             setProperty("value", property("value"));
@@ -157,7 +157,7 @@ private:
         notifyTextChanged();
     }
 
-    void mousePressEvent(QMouseEvent *event) {
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE {
         QDoubleSpinBox::mousePressEvent(event);
         notifyTextChanged();
     }
diff --git a/src/widgets/dialogs/qinputdialog.h b/src/widgets/dialogs/qinputdialog.h
index 4511e367d4..d1aa478e79 100644
--- a/src/widgets/dialogs/qinputdialog.h
+++ b/src/widgets/dialogs/qinputdialog.h
@@ -152,10 +152,10 @@ public:
 #endif
     void open(QObject *receiver, const char *member);
 
-    QSize minimumSizeHint() const;
-    QSize sizeHint() const;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
-    void setVisible(bool visible);
+    void setVisible(bool visible) Q_DECL_OVERRIDE;
 
     static QString getText(QWidget *parent, const QString &title, const QString &label,
                            QLineEdit::EchoMode echo = QLineEdit::Normal,
@@ -195,7 +195,7 @@ Q_SIGNALS:
     void doubleValueSelected(double value);
 
 public:
-    void done(int result);
+    void done(int result) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QInputDialog)
diff --git a/src/widgets/dialogs/qmessagebox.cpp b/src/widgets/dialogs/qmessagebox.cpp
index effcef2bc9..e4862f16d1 100644
--- a/src/widgets/dialogs/qmessagebox.cpp
+++ b/src/widgets/dialogs/qmessagebox.cpp
@@ -89,7 +89,7 @@ public:
     {
     public:
         TextEdit(QWidget *parent=0) : QTextEdit(parent) { }
-        void contextMenuEvent(QContextMenuEvent * e)
+        void contextMenuEvent(QContextMenuEvent * e) Q_DECL_OVERRIDE
         {
 #ifndef QT_NO_CONTEXTMENU
             QMenu *menu = createStandardContextMenu();
@@ -167,7 +167,7 @@ public:
     void setLabel(DetailButtonLabel lbl)
     { setText(label(lbl)); }
 
-    QSize sizeHint() const
+    QSize sizeHint() const Q_DECL_OVERRIDE
     {
         ensurePolished();
         QStyleOptionButton opt;
@@ -256,9 +256,9 @@ public:
     QByteArray signalToDisconnectOnClose;
     QSharedPointer<QMessageDialogOptions> options;
 private:
-    void initHelper(QPlatformDialogHelper *);
-    void helperPrepareShow(QPlatformDialogHelper *);
-    void helperDone(QDialog::DialogCode, QPlatformDialogHelper *);
+    void initHelper(QPlatformDialogHelper *) Q_DECL_OVERRIDE;
+    void helperPrepareShow(QPlatformDialogHelper *) Q_DECL_OVERRIDE;
+    void helperDone(QDialog::DialogCode, QPlatformDialogHelper *) Q_DECL_OVERRIDE;
 };
 
 void QMessageBoxPrivate::init(const QString &title, const QString &text)
diff --git a/src/widgets/dialogs/qmessagebox.h b/src/widgets/dialogs/qmessagebox.h
index 1b47e9c575..6cd3085cf9 100644
--- a/src/widgets/dialogs/qmessagebox.h
+++ b/src/widgets/dialogs/qmessagebox.h
@@ -293,12 +293,12 @@ public Q_SLOTS:
 #endif
 
 protected:
-    bool event(QEvent *e);
-    void resizeEvent(QResizeEvent *event);
-    void showEvent(QShowEvent *event);
-    void closeEvent(QCloseEvent *event);
-    void keyPressEvent(QKeyEvent *event);
-    void changeEvent(QEvent *event);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
+    void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_PRIVATE_SLOT(d_func(), void _q_buttonClicked(QAbstractButton *))
diff --git a/src/widgets/dialogs/qprogressdialog.h b/src/widgets/dialogs/qprogressdialog.h
index 7547f06682..84a5f9e234 100644
--- a/src/widgets/dialogs/qprogressdialog.h
+++ b/src/widgets/dialogs/qprogressdialog.h
@@ -77,7 +77,7 @@ public:
 
     int value() const;
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     QString labelText() const;
     int minimumDuration() const;
@@ -111,10 +111,10 @@ Q_SIGNALS:
     void canceled();
 
 protected:
-    void resizeEvent(QResizeEvent *event);
-    void closeEvent(QCloseEvent *event);
-    void changeEvent(QEvent *event);
-    void showEvent(QShowEvent *event);
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
 
 protected Q_SLOTS:
     void forceShow();
diff --git a/src/widgets/dialogs/qsidebar_p.h b/src/widgets/dialogs/qsidebar_p.h
index 402863da85..e90fe5e636 100644
--- a/src/widgets/dialogs/qsidebar_p.h
+++ b/src/widgets/dialogs/qsidebar_p.h
@@ -61,7 +61,7 @@ class QSideBarDelegate : public QStyledItemDelegate
  public:
      QSideBarDelegate(QWidget *parent = 0) : QStyledItemDelegate(parent) {}
      void initStyleOption(QStyleOptionViewItem *option,
-                          const QModelIndex &index) const;
+                          const QModelIndex &index) const Q_DECL_OVERRIDE;
 };
 
 class Q_AUTOTEST_EXPORT QUrlModel : public QStandardItemModel
@@ -76,14 +76,14 @@ public:
 
     QUrlModel(QObject *parent = 0);
 
-    QStringList mimeTypes() const;
-    QMimeData *mimeData(const QModelIndexList &indexes) const;
+    QStringList mimeTypes() const Q_DECL_OVERRIDE;
+    QMimeData *mimeData(const QModelIndexList &indexes) const Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
     bool canDrop(QDragEnterEvent *event);
-    bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent);
+    bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) Q_DECL_OVERRIDE;
 #endif
-    Qt::ItemFlags flags(const QModelIndex &index) const;
-    bool setData(const QModelIndex &index, const QVariant &value, int role=Qt::EditRole);
+    Qt::ItemFlags flags(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    bool setData(const QModelIndex &index, const QVariant &value, int role=Qt::EditRole) Q_DECL_OVERRIDE;
 
     void setUrls(const QList<QUrl> &list);
     void addUrls(const QList<QUrl> &urls, int row = -1, bool move = true);
@@ -116,7 +116,7 @@ public:
     void setModelAndUrls(QFileSystemModel *model, const QList<QUrl> &newUrls);
     ~QSidebar();
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     void setUrls(const QList<QUrl> &list) { urlModel->setUrls(list); }
     void addUrls(const QList<QUrl> &list, int row) { urlModel->addUrls(list, row); }
@@ -125,10 +125,10 @@ public:
     void selectUrl(const QUrl &url);
 
 protected:
-    bool event(QEvent * e);
-    void focusInEvent(QFocusEvent *event);
+    bool event(QEvent * e) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void dragEnterEvent(QDragEnterEvent *event);
+    void dragEnterEvent(QDragEnterEvent *event) Q_DECL_OVERRIDE;
 #endif
 
 private Q_SLOTS:
diff --git a/src/widgets/dialogs/qwizard.cpp b/src/widgets/dialogs/qwizard.cpp
index a378daa3d3..35ff6d73f1 100644
--- a/src/widgets/dialogs/qwizard.cpp
+++ b/src/widgets/dialogs/qwizard.cpp
@@ -290,7 +290,7 @@ public:
                Qt::TextFormat titleFormat, Qt::TextFormat subTitleFormat);
 
 protected:
-    void paintEvent(QPaintEvent *event);
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
 #if !defined(QT_NO_STYLE_WINDOWSVISTA)
 private:
     bool vistaDisabled() const;
@@ -446,7 +446,7 @@ public:
             m_layout->addWidget(m_sideWidget);
     }
 
-    QSize minimumSizeHint() const {
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE {
         if (!pixmap() && !pixmap()->isNull())
             return pixmap()->size();
         return QFrame::minimumSizeHint();
diff --git a/src/widgets/dialogs/qwizard.h b/src/widgets/dialogs/qwizard.h
index 25b0d5e3ee..7ceddf5049 100644
--- a/src/widgets/dialogs/qwizard.h
+++ b/src/widgets/dialogs/qwizard.h
@@ -161,8 +161,8 @@ public:
     void setDefaultProperty(const char *className, const char *property,
                             const char *changedSignal);
 
-    void setVisible(bool visible);
-    QSize sizeHint() const;
+    void setVisible(bool visible) Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void currentIdChanged(int id);
@@ -177,13 +177,13 @@ public Q_SLOTS:
     void restart();
 
 protected:
-    bool event(QEvent *event);
-    void resizeEvent(QResizeEvent *event);
-    void paintEvent(QPaintEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
 #ifdef Q_OS_WIN
     bool nativeEvent(const QByteArray &eventType, void * message, long * result);
 #endif
-    void done(int result);
+    void done(int result) Q_DECL_OVERRIDE;
     virtual void initializePage(int id);
     virtual void cleanupPage(int id);
 
diff --git a/src/widgets/effects/qgraphicseffect.h b/src/widgets/effects/qgraphicseffect.h
index a7db19431d..bdb1770f83 100644
--- a/src/widgets/effects/qgraphicseffect.h
+++ b/src/widgets/effects/qgraphicseffect.h
@@ -137,7 +137,7 @@ Q_SIGNALS:
     void strengthChanged(qreal strength);
 
 protected:
-    void draw(QPainter *painter);
+    void draw(QPainter *painter) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QGraphicsColorizeEffect)
@@ -162,7 +162,7 @@ public:
     QGraphicsBlurEffect(QObject *parent = 0);
     ~QGraphicsBlurEffect();
 
-    QRectF boundingRectFor(const QRectF &rect) const;
+    QRectF boundingRectFor(const QRectF &rect) const Q_DECL_OVERRIDE;
     qreal blurRadius() const;
     BlurHints blurHints() const;
 
@@ -175,7 +175,7 @@ Q_SIGNALS:
     void blurHintsChanged(BlurHints hints);
 
 protected:
-    void draw(QPainter *painter);
+    void draw(QPainter *painter) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QGraphicsBlurEffect)
@@ -197,7 +197,7 @@ public:
     QGraphicsDropShadowEffect(QObject *parent = 0);
     ~QGraphicsDropShadowEffect();
 
-    QRectF boundingRectFor(const QRectF &rect) const;
+    QRectF boundingRectFor(const QRectF &rect) const Q_DECL_OVERRIDE;
     QPointF offset() const;
 
     inline qreal xOffset() const
@@ -233,7 +233,7 @@ Q_SIGNALS:
     void colorChanged(const QColor &color);
 
 protected:
-    void draw(QPainter *painter);
+    void draw(QPainter *painter) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QGraphicsDropShadowEffect)
@@ -262,7 +262,7 @@ Q_SIGNALS:
     void opacityMaskChanged(const QBrush &mask);
 
 protected:
-    void draw(QPainter *painter);
+    void draw(QPainter *painter) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QGraphicsOpacityEffect)
diff --git a/src/widgets/effects/qpixmapfilter_p.h b/src/widgets/effects/qpixmapfilter_p.h
index 22925f66cf..6f71bd93e0 100644
--- a/src/widgets/effects/qpixmapfilter_p.h
+++ b/src/widgets/effects/qpixmapfilter_p.h
@@ -98,8 +98,8 @@ public:
 
     void setConvolutionKernel(const qreal *matrix, int rows, int columns);
 
-    QRectF boundingRectFor(const QRectF &rect) const;
-    void draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect = QRectF()) const;
+    QRectF boundingRectFor(const QRectF &rect) const Q_DECL_OVERRIDE;
+    void draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect = QRectF()) const Q_DECL_OVERRIDE;
 
 private:
     friend class QGLPixmapConvolutionFilter;
@@ -126,8 +126,8 @@ public:
     qreal radius() const;
     QGraphicsBlurEffect::BlurHints blurHints() const;
 
-    QRectF boundingRectFor(const QRectF &rect) const;
-    void draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect = QRectF()) const;
+    QRectF boundingRectFor(const QRectF &rect) const Q_DECL_OVERRIDE;
+    void draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect = QRectF()) const Q_DECL_OVERRIDE;
 
 private:
     friend class QGLPixmapBlurFilter;
@@ -149,7 +149,7 @@ public:
     void setStrength(qreal strength);
     qreal strength() const;
 
-    void draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect = QRectF()) const;
+    void draw(QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect = QRectF()) const Q_DECL_OVERRIDE;
 };
 
 class QPixmapDropShadowFilterPrivate;
@@ -163,8 +163,8 @@ public:
     QPixmapDropShadowFilter(QObject *parent = 0);
     ~QPixmapDropShadowFilter();
 
-    QRectF boundingRectFor(const QRectF &rect) const;
-    void draw(QPainter *p, const QPointF &pos, const QPixmap &px, const QRectF &src = QRectF()) const;
+    QRectF boundingRectFor(const QRectF &rect) const Q_DECL_OVERRIDE;
+    void draw(QPainter *p, const QPointF &pos, const QPixmap &px, const QRectF &src = QRectF()) const Q_DECL_OVERRIDE;
 
     qreal blurRadius() const;
     void setBlurRadius(qreal radius);
diff --git a/src/widgets/graphicsview/qgraphicsanchorlayout.h b/src/widgets/graphicsview/qgraphicsanchorlayout.h
index 13494dd81a..cec85f8430 100644
--- a/src/widgets/graphicsview/qgraphicsanchorlayout.h
+++ b/src/widgets/graphicsview/qgraphicsanchorlayout.h
@@ -92,14 +92,14 @@ public:
     qreal horizontalSpacing() const;
     qreal verticalSpacing() const;
 
-    void removeAt(int index);
-    void setGeometry(const QRectF &rect);
-    int count() const;
-    QGraphicsLayoutItem *itemAt(int index) const;
+    void removeAt(int index) Q_DECL_OVERRIDE;
+    void setGeometry(const QRectF &rect) Q_DECL_OVERRIDE;
+    int count() const Q_DECL_OVERRIDE;
+    QGraphicsLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
 
-    void invalidate();
+    void invalidate() Q_DECL_OVERRIDE;
 protected:
-    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsAnchorLayout)
diff --git a/src/widgets/graphicsview/qgraphicsanchorlayout_p.h b/src/widgets/graphicsview/qgraphicsanchorlayout_p.h
index 457a5a2769..96ca7544ee 100644
--- a/src/widgets/graphicsview/qgraphicsanchorlayout_p.h
+++ b/src/widgets/graphicsview/qgraphicsanchorlayout_p.h
@@ -189,7 +189,7 @@ struct SequentialAnchorData : public AnchorData
 #endif
     }
 
-    virtual void updateChildrenSizes();
+    virtual void updateChildrenSizes() Q_DECL_OVERRIDE;
     void calculateSizeHints();
 
     QVector<AnchorVertex*> m_children;          // list of vertices in the sequence
@@ -217,7 +217,7 @@ struct ParallelAnchorData : public AnchorData
 #endif
     }
 
-    virtual void updateChildrenSizes();
+    virtual void updateChildrenSizes() Q_DECL_OVERRIDE;
     bool calculateSizeHints();
 
     bool secondForward() const {
diff --git a/src/widgets/graphicsview/qgraphicsgridlayout.h b/src/widgets/graphicsview/qgraphicsgridlayout.h
index 26b6daa96f..43400c3ce4 100644
--- a/src/widgets/graphicsview/qgraphicsgridlayout.h
+++ b/src/widgets/graphicsview/qgraphicsgridlayout.h
@@ -100,16 +100,16 @@ public:
     QGraphicsLayoutItem *itemAt(int row, int column) const;
 
     // inherited from QGraphicsLayout
-    int count() const;
-    QGraphicsLayoutItem *itemAt(int index) const;
-    void removeAt(int index);
+    int count() const Q_DECL_OVERRIDE;
+    QGraphicsLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
+    void removeAt(int index) Q_DECL_OVERRIDE;
     void removeItem(QGraphicsLayoutItem *item);
 
-    void invalidate();
+    void invalidate() Q_DECL_OVERRIDE;
 
     // inherited from QGraphicsLayoutItem
-    void setGeometry(const QRectF &rect);
-    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+    void setGeometry(const QRectF &rect) Q_DECL_OVERRIDE;
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const Q_DECL_OVERRIDE;
 
     // ####
     //QRect cellRect(int row, int column, int rowSpan = 1, int columnSpan = 1) const;
diff --git a/src/widgets/graphicsview/qgraphicsitem.h b/src/widgets/graphicsview/qgraphicsitem.h
index 3a238390d7..783c15eeee 100644
--- a/src/widgets/graphicsview/qgraphicsitem.h
+++ b/src/widgets/graphicsview/qgraphicsitem.h
@@ -587,7 +587,7 @@ Q_SIGNALS:
 protected:
     QGraphicsObject(QGraphicsItemPrivate &dd, QGraphicsItem *parent);
 
-    bool event(QEvent *ev);
+    bool event(QEvent *ev) Q_DECL_OVERRIDE;
 
 private:
     friend class QGraphicsItem;
@@ -608,8 +608,8 @@ public:
     QBrush brush() const;
     void setBrush(const QBrush &brush);
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
 protected:
     QAbstractGraphicsShapeItem(QAbstractGraphicsShapeItemPrivate &dd,
@@ -631,22 +631,22 @@ public:
     QPainterPath path() const;
     void setPath(const QPainterPath &path);
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 2 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
 protected:
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsPathItem)
@@ -666,22 +666,22 @@ public:
     void setRect(const QRectF &rect);
     inline void setRect(qreal x, qreal y, qreal w, qreal h);
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 3 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
 protected:
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsRectItem)
@@ -710,22 +710,22 @@ public:
     int spanAngle() const;
     void setSpanAngle(int angle);
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 4 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
 protected:
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsEllipseItem)
@@ -750,22 +750,22 @@ public:
     Qt::FillRule fillRule() const;
     void setFillRule(Qt::FillRule rule);
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 5 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
 protected:
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsPolygonItem)
@@ -789,22 +789,22 @@ public:
     inline void setLine(qreal x1, qreal y1, qreal x2, qreal y2)
     { setLine(QLineF(x1, y1, x2, y2)); }
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 6 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
 protected:
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsLineItem)
@@ -835,25 +835,25 @@ public:
     void setOffset(const QPointF &offset);
     inline void setOffset(qreal x, qreal y);
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 7 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
     ShapeMode shapeMode() const;
     void setShapeMode(ShapeMode mode);
 
 protected:
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsPixmapItem)
@@ -889,17 +889,17 @@ public:
     void setDefaultTextColor(const QColor &c);
     QColor defaultTextColor() const;
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 8 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
     void setTextWidth(qreal width);
     qreal textWidth() const;
@@ -926,30 +926,30 @@ Q_SIGNALS:
     void linkHovered(const QString &);
 
 protected:
-    bool sceneEvent(QEvent *event);
-    void mousePressEvent(QGraphicsSceneMouseEvent *event);
-    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
-    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
-    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
-    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
-    void keyPressEvent(QKeyEvent *event);
-    void keyReleaseEvent(QKeyEvent *event);
-    void focusInEvent(QFocusEvent *event);
-    void focusOutEvent(QFocusEvent *event);
-    void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
-    void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
-    void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
-    void dropEvent(QGraphicsSceneDragDropEvent *event);
-    void inputMethodEvent(QInputMethodEvent *event);
-    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
-    void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
-    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
-
-    QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
-
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool sceneEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
+    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    void keyReleaseEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    void dragEnterEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
+    void dropEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
+    void inputMethodEvent(QInputMethodEvent *event) Q_DECL_OVERRIDE;
+    void hoverEnterEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
+    void hoverMoveEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
+    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
+
+    QVariant inputMethodQuery(Qt::InputMethodQuery query) const Q_DECL_OVERRIDE;
+
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsTextItem)
@@ -974,22 +974,22 @@ public:
     void setFont(const QFont &font);
     QFont font() const;
 
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
-    bool contains(const QPointF &point) const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
+    bool contains(const QPointF &point) const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 9 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
 protected:
-    bool supportsExtension(Extension extension) const;
-    void setExtension(Extension extension, const QVariant &variant);
-    QVariant extension(const QVariant &variant) const;
+    bool supportsExtension(Extension extension) const Q_DECL_OVERRIDE;
+    void setExtension(Extension extension, const QVariant &variant) Q_DECL_OVERRIDE;
+    QVariant extension(const QVariant &variant) const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsSimpleTextItem)
@@ -1006,14 +1006,14 @@ public:
     void addToGroup(QGraphicsItem *item);
     void removeFromGroup(QGraphicsItem *item);
 
-    QRectF boundingRect() const;
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) Q_DECL_OVERRIDE;
 
-    bool isObscuredBy(const QGraphicsItem *item) const;
-    QPainterPath opaqueArea() const;
+    bool isObscuredBy(const QGraphicsItem *item) const Q_DECL_OVERRIDE;
+    QPainterPath opaqueArea() const Q_DECL_OVERRIDE;
 
     enum { Type = 10 };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGraphicsItemGroup)
diff --git a/src/widgets/graphicsview/qgraphicsitem_p.h b/src/widgets/graphicsview/qgraphicsitem_p.h
index f1986a5072..4af39cac2f 100644
--- a/src/widgets/graphicsview/qgraphicsitem_p.h
+++ b/src/widgets/graphicsview/qgraphicsitem_p.h
@@ -699,11 +699,11 @@ public:
         return info->widget->rect();
     }
 
-    QRectF boundingRect(Qt::CoordinateSystem system) const;
-    void draw(QPainter *);
+    QRectF boundingRect(Qt::CoordinateSystem system) const Q_DECL_OVERRIDE;
+    void draw(QPainter *) Q_DECL_OVERRIDE;
     QPixmap pixmap(Qt::CoordinateSystem system,
                    QPoint *offset,
-                   QGraphicsEffect::PixmapPadMode mode) const;
+                   QGraphicsEffect::PixmapPadMode mode) const Q_DECL_OVERRIDE;
     QRect paddedEffectRect(Qt::CoordinateSystem system, QGraphicsEffect::PixmapPadMode mode, const QRectF &sourceRect, bool *unpadded = 0) const;
 
     QGraphicsItem *item;
diff --git a/src/widgets/graphicsview/qgraphicslayout.h b/src/widgets/graphicsview/qgraphicslayout.h
index 83004e36f9..226c3984cf 100644
--- a/src/widgets/graphicsview/qgraphicslayout.h
+++ b/src/widgets/graphicsview/qgraphicslayout.h
@@ -52,12 +52,12 @@ public:
     ~QGraphicsLayout();
 
     void setContentsMargins(qreal left, qreal top, qreal right, qreal bottom);
-    void getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
+    void getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const Q_DECL_OVERRIDE;
 
     void activate();
     bool isActivated() const;
     virtual void invalidate();
-    virtual void updateGeometry();
+    virtual void updateGeometry() Q_DECL_OVERRIDE;
 
     virtual void widgetEvent(QEvent *e);
 
diff --git a/src/widgets/graphicsview/qgraphicslinearlayout.h b/src/widgets/graphicsview/qgraphicslinearlayout.h
index 28c6fb4813..2602ea2a51 100644
--- a/src/widgets/graphicsview/qgraphicslinearlayout.h
+++ b/src/widgets/graphicsview/qgraphicslinearlayout.h
@@ -61,7 +61,7 @@ public:
     void insertStretch(int index, int stretch = 1);
 
     void removeItem(QGraphicsLayoutItem *item);
-    void removeAt(int index);
+    void removeAt(int index) Q_DECL_OVERRIDE;
 
     void setSpacing(qreal spacing);
     qreal spacing() const;
@@ -74,13 +74,13 @@ public:
     void setAlignment(QGraphicsLayoutItem *item, Qt::Alignment alignment);
     Qt::Alignment alignment(QGraphicsLayoutItem *item) const;
 
-    void setGeometry(const QRectF &rect);
+    void setGeometry(const QRectF &rect) Q_DECL_OVERRIDE;
 
-    int count() const;
-    QGraphicsLayoutItem *itemAt(int index) const;
+    int count() const Q_DECL_OVERRIDE;
+    QGraphicsLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
 
-    void invalidate();
-    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+    void invalidate() Q_DECL_OVERRIDE;
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const Q_DECL_OVERRIDE;
 
 #if 0 // ###
     Q5SizePolicy::ControlTypes controlTypes(LayoutSide side) const;
diff --git a/src/widgets/graphicsview/qgraphicsproxywidget.h b/src/widgets/graphicsview/qgraphicsproxywidget.h
index 765caea0b1..c2bd73e056 100644
--- a/src/widgets/graphicsview/qgraphicsproxywidget.h
+++ b/src/widgets/graphicsview/qgraphicsproxywidget.h
@@ -55,63 +55,63 @@ public:
 
     QRectF subWidgetRect(const QWidget *widget) const;
 
-    void setGeometry(const QRectF &rect);
+    void setGeometry(const QRectF &rect) Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) Q_DECL_OVERRIDE;
 
     enum {
         Type = 12
     };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
     QGraphicsProxyWidget *createProxyForChildWidget(QWidget *child);
 
 protected:
-    QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+    QVariant itemChange(GraphicsItemChange change, const QVariant &value) Q_DECL_OVERRIDE;
 
-    bool event(QEvent *event);
-    bool eventFilter(QObject *object, QEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    bool eventFilter(QObject *object, QEvent *event) Q_DECL_OVERRIDE;
 
-    void showEvent(QShowEvent *event);
-    void hideEvent(QHideEvent *event);
+    void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent *event) Q_DECL_OVERRIDE;
 
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
+    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) Q_DECL_OVERRIDE;
 #endif
 
 #ifndef QT_NO_DRAGANDDROP
-    void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
-    void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
-    void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
-    void dropEvent(QGraphicsSceneDragDropEvent *event);
+    void dragEnterEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
+    void dropEvent(QGraphicsSceneDragDropEvent *event) Q_DECL_OVERRIDE;
 #endif
 
-    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
-    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
-    void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
-    void grabMouseEvent(QEvent *event);
-    void ungrabMouseEvent(QEvent *event);
+    void hoverEnterEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
+    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
+    void hoverMoveEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
+    void grabMouseEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void ungrabMouseEvent(QEvent *event) Q_DECL_OVERRIDE;
 
-    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
-    void mousePressEvent(QGraphicsSceneMouseEvent *event);
-    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
-    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
+    void mouseMoveEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QGraphicsSceneWheelEvent *event);
+    void wheelEvent(QGraphicsSceneWheelEvent *event) Q_DECL_OVERRIDE;
 #endif
 
-    void keyPressEvent(QKeyEvent *event);
-    void keyReleaseEvent(QKeyEvent *event);
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    void keyReleaseEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
 
-    void focusInEvent(QFocusEvent *event);
-    void focusOutEvent(QFocusEvent *event);
-    bool focusNextPrevChild(bool next);
+    void focusInEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
 
-    QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
-    void inputMethodEvent(QInputMethodEvent *event);
+    QVariant inputMethodQuery(Qt::InputMethodQuery query) const Q_DECL_OVERRIDE;
+    void inputMethodEvent(QInputMethodEvent *event) Q_DECL_OVERRIDE;
 
-    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
-    void resizeEvent(QGraphicsSceneResizeEvent *event);
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const Q_DECL_OVERRIDE;
+    void resizeEvent(QGraphicsSceneResizeEvent *event) Q_DECL_OVERRIDE;
 
 protected Q_SLOTS:
     QGraphicsProxyWidget *newProxyWidget(const QWidget *);
diff --git a/src/widgets/graphicsview/qgraphicsscene.h b/src/widgets/graphicsview/qgraphicsscene.h
index 24255c3b30..6cd5da00c8 100644
--- a/src/widgets/graphicsview/qgraphicsscene.h
+++ b/src/widgets/graphicsview/qgraphicsscene.h
@@ -253,8 +253,8 @@ public Q_SLOTS:
     void clear();
 
 protected:
-    bool event(QEvent *event);
-    bool eventFilter(QObject *watched, QEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    bool eventFilter(QObject *watched, QEvent *event) Q_DECL_OVERRIDE;
     virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
     virtual void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
     virtual void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
diff --git a/src/widgets/graphicsview/qgraphicsscene_bsp.cpp b/src/widgets/graphicsview/qgraphicsscene_bsp.cpp
index 739acecf5b..9a2932d127 100644
--- a/src/widgets/graphicsview/qgraphicsscene_bsp.cpp
+++ b/src/widgets/graphicsview/qgraphicsscene_bsp.cpp
@@ -45,7 +45,7 @@ class QGraphicsSceneInsertItemBspTreeVisitor : public QGraphicsSceneBspTreeVisit
 public:
     QGraphicsItem *item;
 
-    void visit(QList<QGraphicsItem *> *items)
+    void visit(QList<QGraphicsItem *> *items) Q_DECL_OVERRIDE
     { items->prepend(item); }
 };
 
@@ -54,7 +54,7 @@ class QGraphicsSceneRemoveItemBspTreeVisitor : public QGraphicsSceneBspTreeVisit
 public:
     QGraphicsItem *item;
 
-    void visit(QList<QGraphicsItem *> *items)
+    void visit(QList<QGraphicsItem *> *items) Q_DECL_OVERRIDE
     { items->removeAll(item); }
 };
 
@@ -64,7 +64,7 @@ public:
     QList<QGraphicsItem *> *foundItems;
     bool onlyTopLevelItems;
 
-    void visit(QList<QGraphicsItem *> *items)
+    void visit(QList<QGraphicsItem *> *items) Q_DECL_OVERRIDE
     {
         for (int i = 0; i < items->size(); ++i) {
             QGraphicsItem *item = items->at(i);
diff --git a/src/widgets/graphicsview/qgraphicsscenebsptreeindex_p.h b/src/widgets/graphicsview/qgraphicsscenebsptreeindex_p.h
index 02a3b44ff2..c329083844 100644
--- a/src/widgets/graphicsview/qgraphicsscenebsptreeindex_p.h
+++ b/src/widgets/graphicsview/qgraphicsscenebsptreeindex_p.h
@@ -71,25 +71,25 @@ public:
     QGraphicsSceneBspTreeIndex(QGraphicsScene *scene = 0);
     ~QGraphicsSceneBspTreeIndex();
 
-    QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const;
-    QList<QGraphicsItem *> estimateTopLevelItems(const QRectF &rect, Qt::SortOrder order) const;
-    QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const;
+    QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const Q_DECL_OVERRIDE;
+    QList<QGraphicsItem *> estimateTopLevelItems(const QRectF &rect, Qt::SortOrder order) const Q_DECL_OVERRIDE;
+    QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const Q_DECL_OVERRIDE;
 
     int bspTreeDepth() const;
     void setBspTreeDepth(int depth);
 
 protected Q_SLOTS:
-    void updateSceneRect(const QRectF &rect);
+    void updateSceneRect(const QRectF &rect) Q_DECL_OVERRIDE;
 
 protected:
-    bool event(QEvent *event);
-    void clear();
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    void clear() Q_DECL_OVERRIDE;
 
-    void addItem(QGraphicsItem *item);
-    void removeItem(QGraphicsItem *item);
-    void prepareBoundingRectChange(const QGraphicsItem *item);
+    void addItem(QGraphicsItem *item) Q_DECL_OVERRIDE;
+    void removeItem(QGraphicsItem *item) Q_DECL_OVERRIDE;
+    void prepareBoundingRectChange(const QGraphicsItem *item) Q_DECL_OVERRIDE;
 
-    void itemChange(const QGraphicsItem *item, QGraphicsItem::GraphicsItemChange change, const void *const value);
+    void itemChange(const QGraphicsItem *item, QGraphicsItem::GraphicsItemChange change, const void *const value) Q_DECL_OVERRIDE;
 
 private :
     Q_DECLARE_PRIVATE(QGraphicsSceneBspTreeIndex)
diff --git a/src/widgets/graphicsview/qgraphicsscenelinearindex_p.h b/src/widgets/graphicsview/qgraphicsscenelinearindex_p.h
index 57d4ce9702..691e030a89 100644
--- a/src/widgets/graphicsview/qgraphicsscenelinearindex_p.h
+++ b/src/widgets/graphicsview/qgraphicsscenelinearindex_p.h
@@ -65,10 +65,10 @@ public:
     QGraphicsSceneLinearIndex(QGraphicsScene *scene = 0) : QGraphicsSceneIndex(scene), m_numSortedElements(0)
     { }
 
-    QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const
+    QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const Q_DECL_OVERRIDE
     { Q_UNUSED(order); return m_items; }
 
-    virtual QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const
+    virtual QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const Q_DECL_OVERRIDE
     {
         Q_UNUSED(rect);
         Q_UNUSED(order);
@@ -76,16 +76,16 @@ public:
     }
 
 protected :
-    virtual void clear()
+    virtual void clear() Q_DECL_OVERRIDE
     {
         m_items.clear();
         m_numSortedElements = 0;
     }
 
-    virtual void addItem(QGraphicsItem *item)
+    virtual void addItem(QGraphicsItem *item) Q_DECL_OVERRIDE
     { m_items << item; }
 
-    virtual void removeItem(QGraphicsItem *item)
+    virtual void removeItem(QGraphicsItem *item) Q_DECL_OVERRIDE
     {
         // Sort m_items if needed
         if (m_numSortedElements < m_items.size())
diff --git a/src/widgets/graphicsview/qgraphicstransform.h b/src/widgets/graphicsview/qgraphicstransform.h
index db8b574515..c2ee71d78d 100644
--- a/src/widgets/graphicsview/qgraphicstransform.h
+++ b/src/widgets/graphicsview/qgraphicstransform.h
@@ -93,7 +93,7 @@ public:
     qreal zScale() const;
     void setZScale(qreal);
 
-    void applyTo(QMatrix4x4 *matrix) const;
+    void applyTo(QMatrix4x4 *matrix) const Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void originChanged();
@@ -129,7 +129,7 @@ public:
     void setAxis(const QVector3D &axis);
     void setAxis(Qt::Axis axis);
 
-    void applyTo(QMatrix4x4 *matrix) const;
+    void applyTo(QMatrix4x4 *matrix) const Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void originChanged();
diff --git a/src/widgets/graphicsview/qgraphicsview.h b/src/widgets/graphicsview/qgraphicsview.h
index b681551fe7..39c28a1b64 100644
--- a/src/widgets/graphicsview/qgraphicsview.h
+++ b/src/widgets/graphicsview/qgraphicsview.h
@@ -110,7 +110,7 @@ public:
     QGraphicsView(QGraphicsScene *scene, QWidget *parent = 0);
     ~QGraphicsView();
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     QPainter::RenderHints renderHints() const;
     void setRenderHint(QPainter::RenderHint hint, bool enabled = true);
@@ -206,7 +206,7 @@ public:
     inline QPoint mapFromScene(qreal x, qreal y) const;
     inline QPolygon mapFromScene(qreal x, qreal y, qreal w, qreal h) const;
 
-    QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
+    QVariant inputMethodQuery(Qt::InputMethodQuery query) const Q_DECL_OVERRIDE;
 
     QBrush backgroundBrush() const;
     void setBackgroundBrush(const QBrush &brush);
@@ -225,37 +225,37 @@ Q_SIGNALS:
 #endif
 
 protected Q_SLOTS:
-    void setupViewport(QWidget *widget);
+    void setupViewport(QWidget *widget) Q_DECL_OVERRIDE;
 
 protected:
     QGraphicsView(QGraphicsViewPrivate &, QWidget *parent = 0);
-    bool event(QEvent *event);
-    bool viewportEvent(QEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    bool viewportEvent(QEvent *event) Q_DECL_OVERRIDE;
 
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QContextMenuEvent *event);
+    void contextMenuEvent(QContextMenuEvent *event) Q_DECL_OVERRIDE;
 #endif
-    void dragEnterEvent(QDragEnterEvent *event);
-    void dragLeaveEvent(QDragLeaveEvent *event);
-    void dragMoveEvent(QDragMoveEvent *event);
-    void dropEvent(QDropEvent *event);
-    void focusInEvent(QFocusEvent *event);
-    bool focusNextPrevChild(bool next);
-    void focusOutEvent(QFocusEvent *event);
-    void keyPressEvent(QKeyEvent *event);
-    void keyReleaseEvent(QKeyEvent *event);
-    void mouseDoubleClickEvent(QMouseEvent *event);
-    void mousePressEvent(QMouseEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
+    void dragEnterEvent(QDragEnterEvent *event) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *event) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QDragMoveEvent *event) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    void keyReleaseEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *event);
+    void wheelEvent(QWheelEvent *event) Q_DECL_OVERRIDE;
 #endif
-    void paintEvent(QPaintEvent *event);
-    void resizeEvent(QResizeEvent *event);
-    void scrollContentsBy(int dx, int dy);
-    void showEvent(QShowEvent *event);
-    void inputMethodEvent(QInputMethodEvent *event);
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
+    void inputMethodEvent(QInputMethodEvent *event) Q_DECL_OVERRIDE;
 
     virtual void drawBackground(QPainter *painter, const QRectF &rect);
     virtual void drawForeground(QPainter *painter, const QRectF &rect);
diff --git a/src/widgets/graphicsview/qgraphicswidget.h b/src/widgets/graphicsview/qgraphicswidget.h
index d0f3ac9af6..8c347672d5 100644
--- a/src/widgets/graphicsview/qgraphicswidget.h
+++ b/src/widgets/graphicsview/qgraphicswidget.h
@@ -100,12 +100,12 @@ public:
     inline void resize(qreal w, qreal h) { resize(QSizeF(w, h)); }
     QSizeF size() const;
 
-    void setGeometry(const QRectF &rect);
+    void setGeometry(const QRectF &rect) Q_DECL_OVERRIDE;
     inline void setGeometry(qreal x, qreal y, qreal w, qreal h);
     inline QRectF rect() const { return QRectF(QPointF(), size()); }
 
     void setContentsMargins(qreal left, qreal top, qreal right, qreal bottom);
-    void getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
+    void getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const Q_DECL_OVERRIDE;
 
     void setWindowFrameMargins(qreal left, qreal top, qreal right, qreal bottom);
     void getWindowFrameMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
@@ -150,12 +150,12 @@ public:
     enum {
         Type = 11
     };
-    int type() const;
+    int type() const Q_DECL_OVERRIDE;
 
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) Q_DECL_OVERRIDE;
     virtual void paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
-    QRectF boundingRect() const;
-    QPainterPath shape() const;
+    QRectF boundingRect() const Q_DECL_OVERRIDE;
+    QPainterPath shape() const Q_DECL_OVERRIDE;
 
 #if 0
     void dumpFocusChain();
@@ -177,28 +177,28 @@ public Q_SLOTS:
 protected:
     virtual void initStyleOption(QStyleOption *option) const;
 
-    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
-    void updateGeometry();
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const Q_DECL_OVERRIDE;
+    void updateGeometry() Q_DECL_OVERRIDE;
 
     // Notification
-    QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+    QVariant itemChange(GraphicsItemChange change, const QVariant &value) Q_DECL_OVERRIDE;
     virtual QVariant propertyChange(const QString &propertyName, const QVariant &value);
 
     // Scene events
-    bool sceneEvent(QEvent *event);
+    bool sceneEvent(QEvent *event) Q_DECL_OVERRIDE;
     virtual bool windowFrameEvent(QEvent *e);
     virtual Qt::WindowFrameSection windowFrameSectionAt(const QPointF& pos) const;
 
     // Base event handlers
-    bool event(QEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
     //virtual void actionEvent(QActionEvent *event);
     virtual void changeEvent(QEvent *event);
     virtual void closeEvent(QCloseEvent *event);
     //void create(WId window = 0, bool initializeWindow = true, bool destroyOldWindow = true);
     //void destroy(bool destroyWindow = true, bool destroySubWindows = true);
-    void focusInEvent(QFocusEvent *event);
+    void focusInEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
     virtual bool focusNextPrevChild(bool next);
-    void focusOutEvent(QFocusEvent *event);
+    void focusOutEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
     virtual void hideEvent(QHideEvent *event);
     //virtual int metric(PaintDeviceMetric m ) const;
     virtual void moveEvent(QGraphicsSceneMoveEvent *event);
@@ -207,8 +207,8 @@ protected:
     virtual void resizeEvent(QGraphicsSceneResizeEvent *event);
     virtual void showEvent(QShowEvent *event);
     //virtual void tabletEvent(QTabletEvent *event);
-    virtual void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
-    virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
+    virtual void hoverMoveEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
+    virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;
     virtual void grabMouseEvent(QEvent *event);
     virtual void ungrabMouseEvent(QEvent *event);
     virtual void grabKeyboardEvent(QEvent *event);
diff --git a/src/widgets/graphicsview/qgraphicswidget_p.h b/src/widgets/graphicsview/qgraphicswidget_p.h
index 2cb6565f87..16bf2e7c51 100644
--- a/src/widgets/graphicsview/qgraphicswidget_p.h
+++ b/src/widgets/graphicsview/qgraphicswidget_p.h
@@ -103,13 +103,13 @@ public:
     QPalette palette;
     uint inheritedPaletteResolveMask;
     void setPalette_helper(const QPalette &palette);
-    void resolvePalette(uint inheritedMask);
+    void resolvePalette(uint inheritedMask) Q_DECL_OVERRIDE;
     void updatePalette(const QPalette &palette);
     QPalette naturalWidgetPalette() const;
     QFont font;
     uint inheritedFontResolveMask;
     void setFont_helper(const QFont &font);
-    void resolveFont(uint inheritedMask);
+    void resolveFont(uint inheritedMask) Q_DECL_OVERRIDE;
     void updateFont(const QFont &font);
     QFont naturalWidgetFont() const;
 
@@ -124,13 +124,13 @@ public:
     bool hasDecoration() const;
 
     // Private Properties
-    qreal width() const;
-    void setWidth(qreal);
-    void resetWidth();
+    qreal width() const Q_DECL_OVERRIDE;
+    void setWidth(qreal) Q_DECL_OVERRIDE;
+    void resetWidth() Q_DECL_OVERRIDE;
 
-    qreal height() const;
-    void setHeight(qreal);
-    void resetHeight();
+    qreal height() const Q_DECL_OVERRIDE;
+    void setHeight(qreal) Q_DECL_OVERRIDE;
+    void resetHeight() Q_DECL_OVERRIDE;
     void setGeometryFromSetPos();
 
     // State
diff --git a/src/widgets/itemviews/qabstractitemview.h b/src/widgets/itemviews/qabstractitemview.h
index 4162479194..18b024a0e8 100644
--- a/src/widgets/itemviews/qabstractitemview.h
+++ b/src/widgets/itemviews/qabstractitemview.h
@@ -209,7 +209,7 @@ public:
 
     QAbstractItemDelegate *itemDelegate(const QModelIndex &index) const;
 
-    virtual QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
+    virtual QVariant inputMethodQuery(Qt::InputMethodQuery query) const Q_DECL_OVERRIDE;
 
 #ifdef Q_NO_USING_KEYWORD
     inline void update() { QAbstractScrollArea::update(); }
@@ -315,25 +315,25 @@ protected:
     void stopAutoScroll();
     void doAutoScroll();
 
-    bool focusNextPrevChild(bool next);
-    bool event(QEvent *event);
-    bool viewportEvent(QEvent *event);
-    void mousePressEvent(QMouseEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
-    void mouseDoubleClickEvent(QMouseEvent *event);
+    bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    bool viewportEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void dragEnterEvent(QDragEnterEvent *event);
-    void dragMoveEvent(QDragMoveEvent *event);
-    void dragLeaveEvent(QDragLeaveEvent *event);
-    void dropEvent(QDropEvent *event);
+    void dragEnterEvent(QDragEnterEvent *event) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QDragMoveEvent *event) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *event) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;
 #endif
-    void focusInEvent(QFocusEvent *event);
-    void focusOutEvent(QFocusEvent *event);
-    void keyPressEvent(QKeyEvent *event);
-    void resizeEvent(QResizeEvent *event);
-    void timerEvent(QTimerEvent *event);
-    void inputMethodEvent(QInputMethodEvent *event);
+    void focusInEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
+    void inputMethodEvent(QInputMethodEvent *event) Q_DECL_OVERRIDE;
 
 #ifndef QT_NO_DRAGANDDROP
     enum DropIndicatorPosition { OnItem, AboveItem, BelowItem, OnViewport };
diff --git a/src/widgets/itemviews/qcolumnview.h b/src/widgets/itemviews/qcolumnview.h
index 85b38840cf..91b5c10376 100644
--- a/src/widgets/itemviews/qcolumnview.h
+++ b/src/widgets/itemviews/qcolumnview.h
@@ -56,14 +56,14 @@ public:
     ~QColumnView();
 
     // QAbstractItemView overloads
-    QModelIndex indexAt(const QPoint &point) const;
-    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible);
-    QSize sizeHint() const;
-    QRect visualRect(const QModelIndex &index) const;
-    void setModel(QAbstractItemModel *model);
-    void setSelectionModel(QItemSelectionModel * selectionModel);
-    void setRootIndex(const QModelIndex &index);
-    void selectAll();
+    QModelIndex indexAt(const QPoint &point) const Q_DECL_OVERRIDE;
+    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QRect visualRect(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
+    void setSelectionModel(QItemSelectionModel * selectionModel) Q_DECL_OVERRIDE;
+    void setRootIndex(const QModelIndex &index) Q_DECL_OVERRIDE;
+    void selectAll() Q_DECL_OVERRIDE;
 
     // QColumnView functions
     void setResizeGripsVisible(bool visible);
@@ -79,18 +79,18 @@ protected:
     QColumnView(QColumnViewPrivate &dd, QWidget *parent = 0);
 
     // QAbstractItemView overloads
-    bool isIndexHidden(const QModelIndex &index) const;
-    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
-    void resizeEvent(QResizeEvent *event);
-    void setSelection(const QRect & rect, QItemSelectionModel::SelectionFlags command);
-    QRegion visualRegionForSelection(const QItemSelection &selection) const;
-    int horizontalOffset() const;
-    int verticalOffset() const;
-    void rowsInserted(const QModelIndex &parent, int start, int end);
-    void currentChanged(const QModelIndex &current, const QModelIndex &previous);
+    bool isIndexHidden(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    void setSelection(const QRect & rect, QItemSelectionModel::SelectionFlags command) Q_DECL_OVERRIDE;
+    QRegion visualRegionForSelection(const QItemSelection &selection) const Q_DECL_OVERRIDE;
+    int horizontalOffset() const Q_DECL_OVERRIDE;
+    int verticalOffset() const Q_DECL_OVERRIDE;
+    void rowsInserted(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
+    void currentChanged(const QModelIndex &current, const QModelIndex &previous) Q_DECL_OVERRIDE;
 
     // QColumnView functions
-    void scrollContentsBy(int dx, int dy);
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
     virtual QAbstractItemView* createColumn(const QModelIndex &rootIndex);
     void initializeColumn(QAbstractItemView *column) const;
 
diff --git a/src/widgets/itemviews/qcolumnview_p.h b/src/widgets/itemviews/qcolumnview_p.h
index f96170679f..29bd97e5ef 100644
--- a/src/widgets/itemviews/qcolumnview_p.h
+++ b/src/widgets/itemviews/qcolumnview_p.h
@@ -73,7 +73,7 @@ public:
         setMinimumWidth(previewWidget->minimumWidth());
     }
 
-    void resizeEvent(QResizeEvent * event){
+    void resizeEvent(QResizeEvent * event) Q_DECL_OVERRIDE{
         if (!previewWidget)
             return;
         previewWidget->resize(
@@ -89,36 +89,36 @@ public:
         QAbstractScrollArea::resizeEvent(event);
     }
 
-    QRect visualRect(const QModelIndex &) const
+    QRect visualRect(const QModelIndex &) const Q_DECL_OVERRIDE
     {
         return QRect();
     }
-    void scrollTo(const QModelIndex &, ScrollHint)
+    void scrollTo(const QModelIndex &, ScrollHint) Q_DECL_OVERRIDE
     {
     }
-    QModelIndex indexAt(const QPoint &) const
+    QModelIndex indexAt(const QPoint &) const Q_DECL_OVERRIDE
     {
         return QModelIndex();
     }
-    QModelIndex moveCursor(CursorAction, Qt::KeyboardModifiers)
+    QModelIndex moveCursor(CursorAction, Qt::KeyboardModifiers) Q_DECL_OVERRIDE
     {
         return QModelIndex();
     }
-    int horizontalOffset () const {
+    int horizontalOffset () const Q_DECL_OVERRIDE {
         return 0;
     }
-    int verticalOffset () const {
+    int verticalOffset () const Q_DECL_OVERRIDE {
         return 0;
     }
-    QRegion visualRegionForSelection(const QItemSelection &) const
+    QRegion visualRegionForSelection(const QItemSelection &) const Q_DECL_OVERRIDE
     {
         return QRegion();
     }
-    bool isIndexHidden(const QModelIndex &) const
+    bool isIndexHidden(const QModelIndex &) const Q_DECL_OVERRIDE
     {
         return false;
     }
-    void setSelection(const QRect &, QItemSelectionModel::SelectionFlags)
+    void setSelection(const QRect &, QItemSelectionModel::SelectionFlags) Q_DECL_OVERRIDE
     {
     }
 private:
@@ -146,7 +146,7 @@ public:
     void _q_gripMoved(int offset);
     void _q_changeCurrentColumn();
     void _q_clicked(const QModelIndex &index);
-    void _q_columnsInserted(const QModelIndex &parent, int start, int end);
+    void _q_columnsInserted(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
 
     QList<QAbstractItemView*> columns;
     QVector<int> columnSizes; // used during init and corner moving
@@ -171,7 +171,7 @@ public:
 
     void paint(QPainter *painter,
                const QStyleOptionViewItem &option,
-               const QModelIndex &index) const;
+               const QModelIndex &index) const Q_DECL_OVERRIDE;
 };
 #endif // QT_NO_QCOLUMNVIEW
 
diff --git a/src/widgets/itemviews/qcolumnviewgrip_p.h b/src/widgets/itemviews/qcolumnviewgrip_p.h
index e5e936a30d..e80f4b37be 100644
--- a/src/widgets/itemviews/qcolumnviewgrip_p.h
+++ b/src/widgets/itemviews/qcolumnviewgrip_p.h
@@ -67,11 +67,11 @@ public:
 
 protected:
     QColumnViewGrip(QColumnViewGripPrivate &, QWidget *parent = 0, Qt::WindowFlags f = 0);
-    void paintEvent(QPaintEvent *event);
-    void mouseDoubleClickEvent(QMouseEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
-    void mousePressEvent(QMouseEvent *event);
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QColumnViewGrip)
diff --git a/src/widgets/itemviews/qdatawidgetmapper.cpp b/src/widgets/itemviews/qdatawidgetmapper.cpp
index 43ed0b2ae5..2cf0725657 100644
--- a/src/widgets/itemviews/qdatawidgetmapper.cpp
+++ b/src/widgets/itemviews/qdatawidgetmapper.cpp
@@ -202,7 +202,7 @@ void QDataWidgetMapperPrivate::_q_commitData(QWidget *w)
 class QFocusHelper: public QWidget
 {
 public:
-    bool focusNextPrevChild(bool next)
+    bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE
     {
         return QWidget::focusNextPrevChild(next);
     }
diff --git a/src/widgets/itemviews/qdirmodel.h b/src/widgets/itemviews/qdirmodel.h
index 249d7711c0..68d6f56152 100644
--- a/src/widgets/itemviews/qdirmodel.h
+++ b/src/widgets/itemviews/qdirmodel.h
@@ -64,27 +64,27 @@ public:
     explicit QDirModel(QObject *parent = 0);
     ~QDirModel();
 
-    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
-    QModelIndex parent(const QModelIndex &child) const;
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    QModelIndex parent(const QModelIndex &child) const Q_DECL_OVERRIDE;
 
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
 
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
-    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
+    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) Q_DECL_OVERRIDE;
 
-    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
 
-    bool hasChildren(const QModelIndex &index = QModelIndex()) const;
-    Qt::ItemFlags flags(const QModelIndex &index) const;
+    bool hasChildren(const QModelIndex &index = QModelIndex()) const Q_DECL_OVERRIDE;
+    Qt::ItemFlags flags(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);
+    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder) Q_DECL_OVERRIDE;
 
-    QStringList mimeTypes() const;
-    QMimeData *mimeData(const QModelIndexList &indexes) const;
+    QStringList mimeTypes() const Q_DECL_OVERRIDE;
+    QMimeData *mimeData(const QModelIndexList &indexes) const Q_DECL_OVERRIDE;
     bool dropMimeData(const QMimeData *data, Qt::DropAction action,
-                      int row, int column, const QModelIndex &parent);
-    Qt::DropActions supportedDropActions() const;
+                      int row, int column, const QModelIndex &parent) Q_DECL_OVERRIDE;
+    Qt::DropActions supportedDropActions() const Q_DECL_OVERRIDE;
 
     // QDirModel specific API
 
diff --git a/src/widgets/itemviews/qheaderview.h b/src/widgets/itemviews/qheaderview.h
index 4a627b26b4..b8ed9f3f7d 100644
--- a/src/widgets/itemviews/qheaderview.h
+++ b/src/widgets/itemviews/qheaderview.h
@@ -71,13 +71,13 @@ public:
     explicit QHeaderView(Qt::Orientation orientation, QWidget *parent = 0);
     virtual ~QHeaderView();
 
-    void setModel(QAbstractItemModel *model);
+    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
 
     Qt::Orientation orientation() const;
     int offset() const;
     int length() const;
-    QSize sizeHint() const;
-    void setVisible(bool v);
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    void setVisible(bool v) Q_DECL_OVERRIDE;
     int sectionSizeHint(int logicalIndex) const;
 
     int visualIndexAt(int position) const;
@@ -165,7 +165,7 @@ public:
     Qt::Alignment defaultAlignment() const;
     void setDefaultAlignment(Qt::Alignment alignment);
 
-    void doItemsLayout();
+    void doItemsLayout() Q_DECL_OVERRIDE;
     bool sectionsMoved() const;
     bool sectionsHidden() const;
 
@@ -174,7 +174,7 @@ public:
     bool restoreState(const QByteArray &state);
 #endif
 
-    void reset();
+    void reset() Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void setOffset(int offset);
@@ -206,36 +206,36 @@ protected:
 
     void initializeSections();
     void initializeSections(int start, int end);
-    void currentChanged(const QModelIndex &current, const QModelIndex &old);
+    void currentChanged(const QModelIndex &current, const QModelIndex &old) Q_DECL_OVERRIDE;
 
-    bool event(QEvent *e);
-    void paintEvent(QPaintEvent *e);
-    void mousePressEvent(QMouseEvent *e);
-    void mouseMoveEvent(QMouseEvent *e);
-    void mouseReleaseEvent(QMouseEvent *e);
-    void mouseDoubleClickEvent(QMouseEvent *e);
-    bool viewportEvent(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    bool viewportEvent(QEvent *e) Q_DECL_OVERRIDE;
 
     virtual void paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const;
     virtual QSize sectionSizeFromContents(int logicalIndex) const;
 
-    int horizontalOffset() const;
-    int verticalOffset() const;
-    void updateGeometries();
-    void scrollContentsBy(int dx, int dy);
+    int horizontalOffset() const Q_DECL_OVERRIDE;
+    int verticalOffset() const Q_DECL_OVERRIDE;
+    void updateGeometries() Q_DECL_OVERRIDE;
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
 
-    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>());
-    void rowsInserted(const QModelIndex &parent, int start, int end);
+    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>()) Q_DECL_OVERRIDE;
+    void rowsInserted(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
 
-    QRect visualRect(const QModelIndex &index) const;
-    void scrollTo(const QModelIndex &index, ScrollHint hint);
+    QRect visualRect(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    void scrollTo(const QModelIndex &index, ScrollHint hint) Q_DECL_OVERRIDE;
 
-    QModelIndex indexAt(const QPoint &p) const;
-    bool isIndexHidden(const QModelIndex &index) const;
+    QModelIndex indexAt(const QPoint &p) const Q_DECL_OVERRIDE;
+    bool isIndexHidden(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    QModelIndex moveCursor(CursorAction, Qt::KeyboardModifiers);
-    void setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags flags);
-    QRegion visualRegionForSelection(const QItemSelection &selection) const;
+    QModelIndex moveCursor(CursorAction, Qt::KeyboardModifiers) Q_DECL_OVERRIDE;
+    void setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags flags) Q_DECL_OVERRIDE;
+    QRegion visualRegionForSelection(const QItemSelection &selection) const Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionHeader *option) const;
 
     friend class QTableView;
diff --git a/src/widgets/itemviews/qitemdelegate.h b/src/widgets/itemviews/qitemdelegate.h
index 70e55227f8..148e049333 100644
--- a/src/widgets/itemviews/qitemdelegate.h
+++ b/src/widgets/itemviews/qitemdelegate.h
@@ -62,21 +62,21 @@ public:
     // painting
     void paint(QPainter *painter,
                const QStyleOptionViewItem &option,
-               const QModelIndex &index) const;
+               const QModelIndex &index) const Q_DECL_OVERRIDE;
     QSize sizeHint(const QStyleOptionViewItem &option,
-                   const QModelIndex &index) const;
+                   const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     // editing
     QWidget *createEditor(QWidget *parent,
                           const QStyleOptionViewItem &option,
-                          const QModelIndex &index) const;
+                          const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    void setEditorData(QWidget *editor, const QModelIndex &index) const;
-    void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
+    void setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE;
+    void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     void updateEditorGeometry(QWidget *editor,
                               const QStyleOptionViewItem &option,
-                              const QModelIndex &index) const;
+                              const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     // editor factory
     QItemEditorFactory *itemEditorFactory() const;
@@ -99,9 +99,9 @@ protected:
 
     QRect rect(const QStyleOptionViewItem &option, const QModelIndex &index, int role) const;
 
-    bool eventFilter(QObject *object, QEvent *event);
+    bool eventFilter(QObject *object, QEvent *event) Q_DECL_OVERRIDE;
     bool editorEvent(QEvent *event, QAbstractItemModel *model,
-                     const QStyleOptionViewItem &option, const QModelIndex &index);
+                     const QStyleOptionViewItem &option, const QModelIndex &index) Q_DECL_OVERRIDE;
 
     QStyleOptionViewItem setOptions(const QModelIndex &index,
                                     const QStyleOptionViewItem &option) const;
diff --git a/src/widgets/itemviews/qitemeditorfactory.cpp b/src/widgets/itemviews/qitemeditorfactory.cpp
index 2e8cca2997..ee1cb9b002 100644
--- a/src/widgets/itemviews/qitemeditorfactory.cpp
+++ b/src/widgets/itemviews/qitemeditorfactory.cpp
@@ -213,8 +213,8 @@ class QDefaultItemEditorFactory : public QItemEditorFactory
 {
 public:
     inline QDefaultItemEditorFactory() {}
-    QWidget *createEditor(int userType, QWidget *parent) const;
-    QByteArray valuePropertyName(int) const;
+    QWidget *createEditor(int userType, QWidget *parent) const Q_DECL_OVERRIDE;
+    QByteArray valuePropertyName(int) const Q_DECL_OVERRIDE;
 };
 
 QWidget *QDefaultItemEditorFactory::createEditor(int userType, QWidget *parent) const
diff --git a/src/widgets/itemviews/qitemeditorfactory_p.h b/src/widgets/itemviews/qitemeditorfactory_p.h
index 9b46f1c728..739b75c63e 100644
--- a/src/widgets/itemviews/qitemeditorfactory_p.h
+++ b/src/widgets/itemviews/qitemeditorfactory_p.h
@@ -69,7 +69,7 @@ public:
     }
 
 protected:
-    void changeEvent(QEvent *e);
+    void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void resizeToContents();
diff --git a/src/widgets/itemviews/qlistview.h b/src/widgets/itemviews/qlistview.h
index ed0972413b..8e4cc7ff41 100644
--- a/src/widgets/itemviews/qlistview.h
+++ b/src/widgets/itemviews/qlistview.h
@@ -115,13 +115,13 @@ public:
     void setSelectionRectVisible(bool show);
     bool isSelectionRectVisible() const;
 
-    QRect visualRect(const QModelIndex &index) const;
-    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible);
-    QModelIndex indexAt(const QPoint &p) const;
+    QRect visualRect(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) Q_DECL_OVERRIDE;
+    QModelIndex indexAt(const QPoint &p) const Q_DECL_OVERRIDE;
 
-    void doItemsLayout();
-    void reset();
-    void setRootIndex(const QModelIndex &index);
+    void doItemsLayout() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    void setRootIndex(const QModelIndex &index) Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void indexesMoved(const QModelIndexList &indexes);
@@ -129,48 +129,48 @@ Q_SIGNALS:
 protected:
     QListView(QListViewPrivate &, QWidget *parent = 0);
 
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 
-    void scrollContentsBy(int dx, int dy);
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
 
     void resizeContents(int width, int height);
     QSize contentsSize() const;
 
-    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>());
-    void rowsInserted(const QModelIndex &parent, int start, int end);
-    void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end);
+    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>()) Q_DECL_OVERRIDE;
+    void rowsInserted(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
+    void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
 
-    void mouseMoveEvent(QMouseEvent *e);
-    void mouseReleaseEvent(QMouseEvent *e);
+    void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
 
-    void timerEvent(QTimerEvent *e);
-    void resizeEvent(QResizeEvent *e);
+    void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void dragMoveEvent(QDragMoveEvent *e);
-    void dragLeaveEvent(QDragLeaveEvent *e);
-    void dropEvent(QDropEvent *e);
-    void startDrag(Qt::DropActions supportedActions);
+    void dragMoveEvent(QDragMoveEvent *e) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *e) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *e) Q_DECL_OVERRIDE;
+    void startDrag(Qt::DropActions supportedActions) Q_DECL_OVERRIDE;
 #endif // QT_NO_DRAGANDDROP
 
-    QStyleOptionViewItem viewOptions() const;
-    void paintEvent(QPaintEvent *e);
+    QStyleOptionViewItem viewOptions() const Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
 
-    int horizontalOffset() const;
-    int verticalOffset() const;
-    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
+    int horizontalOffset() const Q_DECL_OVERRIDE;
+    int verticalOffset() const Q_DECL_OVERRIDE;
+    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) Q_DECL_OVERRIDE;
     QRect rectForIndex(const QModelIndex &index) const;
     void setPositionForIndex(const QPoint &position, const QModelIndex &index);
 
-    void setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command);
-    QRegion visualRegionForSelection(const QItemSelection &selection) const;
-    QModelIndexList selectedIndexes() const;
+    void setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) Q_DECL_OVERRIDE;
+    QRegion visualRegionForSelection(const QItemSelection &selection) const Q_DECL_OVERRIDE;
+    QModelIndexList selectedIndexes() const Q_DECL_OVERRIDE;
 
-    void updateGeometries();
+    void updateGeometries() Q_DECL_OVERRIDE;
 
-    bool isIndexHidden(const QModelIndex &index) const;
+    bool isIndexHidden(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    void selectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
-    void currentChanged(const QModelIndex &current, const QModelIndex &previous);
+    void selectionChanged(const QItemSelection &selected, const QItemSelection &deselected) Q_DECL_OVERRIDE;
+    void currentChanged(const QModelIndex &current, const QModelIndex &previous) Q_DECL_OVERRIDE;
 
     QSize viewportSizeHint() const Q_DECL_OVERRIDE;
 
diff --git a/src/widgets/itemviews/qlistwidget.h b/src/widgets/itemviews/qlistwidget.h
index 753ad250cd..d5b131722d 100644
--- a/src/widgets/itemviews/qlistwidget.h
+++ b/src/widgets/itemviews/qlistwidget.h
@@ -243,7 +243,7 @@ public:
 
     bool isItemHidden(const QListWidgetItem *item) const;
     void setItemHidden(const QListWidgetItem *item, bool hide);
-    void dropEvent(QDropEvent *event);
+    void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void scrollToItem(const QListWidgetItem *item, QAbstractItemView::ScrollHint hint = EnsureVisible);
@@ -264,7 +264,7 @@ Q_SIGNALS:
     void itemSelectionChanged();
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
     virtual QStringList mimeTypes() const;
     virtual QMimeData *mimeData(const QList<QListWidgetItem*> items) const;
 #ifndef QT_NO_DRAGANDDROP
@@ -277,7 +277,7 @@ protected:
     QListWidgetItem *itemFromIndex(const QModelIndex &index) const;
 
 private:
-    void setModel(QAbstractItemModel *model);
+    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
     Qt::SortOrder sortOrder() const;
 
     Q_DECLARE_PRIVATE(QListWidget)
diff --git a/src/widgets/itemviews/qstyleditemdelegate.h b/src/widgets/itemviews/qstyleditemdelegate.h
index e960e652e9..7f4ff006a3 100644
--- a/src/widgets/itemviews/qstyleditemdelegate.h
+++ b/src/widgets/itemviews/qstyleditemdelegate.h
@@ -57,23 +57,23 @@ public:
 
     // painting
     void paint(QPainter *painter,
-               const QStyleOptionViewItem &option, const QModelIndex &index) const;
+               const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE;
     QSize sizeHint(const QStyleOptionViewItem &option,
-                   const QModelIndex &index) const;
+                   const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     // editing
     QWidget *createEditor(QWidget *parent,
                           const QStyleOptionViewItem &option,
-                          const QModelIndex &index) const;
+                          const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    void setEditorData(QWidget *editor, const QModelIndex &index) const;
+    void setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE;
     void setModelData(QWidget *editor,
                       QAbstractItemModel *model,
-                      const QModelIndex &index) const;
+                      const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     void updateEditorGeometry(QWidget *editor,
                               const QStyleOptionViewItem &option,
-                              const QModelIndex &index) const;
+                              const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     // editor factory
     QItemEditorFactory *itemEditorFactory() const;
@@ -85,9 +85,9 @@ protected:
     virtual void initStyleOption(QStyleOptionViewItem *option,
                                 const QModelIndex &index) const;
 
-    bool eventFilter(QObject *object, QEvent *event);
+    bool eventFilter(QObject *object, QEvent *event) Q_DECL_OVERRIDE;
     bool editorEvent(QEvent *event, QAbstractItemModel *model,
-                     const QStyleOptionViewItem &option, const QModelIndex &index);
+                     const QStyleOptionViewItem &option, const QModelIndex &index) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QStyledItemDelegate)
diff --git a/src/widgets/itemviews/qtableview.cpp b/src/widgets/itemviews/qtableview.cpp
index b5eb509766..062debf4ee 100644
--- a/src/widgets/itemviews/qtableview.cpp
+++ b/src/widgets/itemviews/qtableview.cpp
@@ -584,7 +584,7 @@ class QTableCornerButton : public QAbstractButton
     Q_OBJECT
 public:
     QTableCornerButton(QWidget *parent) : QAbstractButton(parent) {}
-    void paintEvent(QPaintEvent*) {
+    void paintEvent(QPaintEvent*) Q_DECL_OVERRIDE {
         QStyleOptionHeader opt;
         opt.init(this);
         QStyle::State state = QStyle::State_None;
diff --git a/src/widgets/itemviews/qtableview.h b/src/widgets/itemviews/qtableview.h
index 66e1318fad..a38d28f93e 100644
--- a/src/widgets/itemviews/qtableview.h
+++ b/src/widgets/itemviews/qtableview.h
@@ -57,10 +57,10 @@ public:
     explicit QTableView(QWidget *parent = 0);
     ~QTableView();
 
-    void setModel(QAbstractItemModel *model);
-    void setRootIndex(const QModelIndex &index);
-    void setSelectionModel(QItemSelectionModel *selectionModel);
-    void doItemsLayout();
+    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
+    void setRootIndex(const QModelIndex &index) Q_DECL_OVERRIDE;
+    void setSelectionModel(QItemSelectionModel *selectionModel) Q_DECL_OVERRIDE;
+    void doItemsLayout() Q_DECL_OVERRIDE;
 
     QHeaderView *horizontalHeader() const;
     QHeaderView *verticalHeader() const;
@@ -99,9 +99,9 @@ public:
     void setCornerButtonEnabled(bool enable);
     bool isCornerButtonEnabled() const;
 
-    QRect visualRect(const QModelIndex &index) const;
-    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible);
-    QModelIndex indexAt(const QPoint &p) const;
+    QRect visualRect(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) Q_DECL_OVERRIDE;
+    QModelIndex indexAt(const QPoint &p) const Q_DECL_OVERRIDE;
 
     void setSpan(int row, int column, int rowSpan, int columnSpan);
     int rowSpan(int row, int column) const;
@@ -134,37 +134,37 @@ protected Q_SLOTS:
 
 protected:
     QTableView(QTableViewPrivate &, QWidget *parent);
-    void scrollContentsBy(int dx, int dy);
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
 
-    QStyleOptionViewItem viewOptions() const;
-    void paintEvent(QPaintEvent *e);
+    QStyleOptionViewItem viewOptions() const Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
 
-    void timerEvent(QTimerEvent *event);
+    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
 
-    int horizontalOffset() const;
-    int verticalOffset() const;
-    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
+    int horizontalOffset() const Q_DECL_OVERRIDE;
+    int verticalOffset() const Q_DECL_OVERRIDE;
+    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) Q_DECL_OVERRIDE;
 
-    void setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command);
-    QRegion visualRegionForSelection(const QItemSelection &selection) const;
-    QModelIndexList selectedIndexes() const;
+    void setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) Q_DECL_OVERRIDE;
+    QRegion visualRegionForSelection(const QItemSelection &selection) const Q_DECL_OVERRIDE;
+    QModelIndexList selectedIndexes() const Q_DECL_OVERRIDE;
 
-    void updateGeometries();
+    void updateGeometries() Q_DECL_OVERRIDE;
 
     QSize viewportSizeHint() const Q_DECL_OVERRIDE;
 
-    int sizeHintForRow(int row) const;
-    int sizeHintForColumn(int column) const;
+    int sizeHintForRow(int row) const Q_DECL_OVERRIDE;
+    int sizeHintForColumn(int column) const Q_DECL_OVERRIDE;
 
-    void verticalScrollbarAction(int action);
-    void horizontalScrollbarAction(int action);
+    void verticalScrollbarAction(int action) Q_DECL_OVERRIDE;
+    void horizontalScrollbarAction(int action) Q_DECL_OVERRIDE;
 
-    bool isIndexHidden(const QModelIndex &index) const;
+    bool isIndexHidden(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     void selectionChanged(const QItemSelection &selected,
-                          const QItemSelection &deselected);
+                          const QItemSelection &deselected) Q_DECL_OVERRIDE;
     void currentChanged(const QModelIndex &current,
-                          const QModelIndex &previous);
+                          const QModelIndex &previous) Q_DECL_OVERRIDE;
 
 private:
     friend class QAccessibleItemView;
diff --git a/src/widgets/itemviews/qtablewidget.h b/src/widgets/itemviews/qtablewidget.h
index a1d5b4e172..b7b5203d37 100644
--- a/src/widgets/itemviews/qtablewidget.h
+++ b/src/widgets/itemviews/qtablewidget.h
@@ -311,7 +311,7 @@ Q_SIGNALS:
     void currentCellChanged(int currentRow, int currentColumn, int previousRow, int previousColumn);
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
     virtual QStringList mimeTypes() const;
     virtual QMimeData *mimeData(const QList<QTableWidgetItem*> items) const;
     virtual bool dropMimeData(int row, int column, const QMimeData *data, Qt::DropAction action);
@@ -320,10 +320,10 @@ protected:
 
     QModelIndex indexFromItem(QTableWidgetItem *item) const;
     QTableWidgetItem *itemFromIndex(const QModelIndex &index) const;
-    void dropEvent(QDropEvent *event);
+    void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;
 
 private:
-    void setModel(QAbstractItemModel *model);
+    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
 
     Q_DECLARE_PRIVATE(QTableWidget)
     Q_DISABLE_COPY(QTableWidget)
diff --git a/src/widgets/itemviews/qtreeview.h b/src/widgets/itemviews/qtreeview.h
index afdb94d770..2d7aaee69d 100644
--- a/src/widgets/itemviews/qtreeview.h
+++ b/src/widgets/itemviews/qtreeview.h
@@ -63,9 +63,9 @@ public:
     explicit QTreeView(QWidget *parent = 0);
     ~QTreeView();
 
-    void setModel(QAbstractItemModel *model);
-    void setRootIndex(const QModelIndex &index);
-    void setSelectionModel(QItemSelectionModel *selectionModel);
+    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
+    void setRootIndex(const QModelIndex &index) Q_DECL_OVERRIDE;
+    void setSelectionModel(QItemSelectionModel *selectionModel) Q_DECL_OVERRIDE;
 
     QHeaderView *header() const;
     void setHeader(QHeaderView *header);
@@ -124,21 +124,21 @@ public:
     void setTreePosition(int logicalIndex);
     int treePosition() const;
 
-    void keyboardSearch(const QString &search);
+    void keyboardSearch(const QString &search) Q_DECL_OVERRIDE;
 
-    QRect visualRect(const QModelIndex &index) const;
-    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible);
-    QModelIndex indexAt(const QPoint &p) const;
+    QRect visualRect(const QModelIndex &index) const Q_DECL_OVERRIDE;
+    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) Q_DECL_OVERRIDE;
+    QModelIndex indexAt(const QPoint &p) const Q_DECL_OVERRIDE;
     QModelIndex indexAbove(const QModelIndex &index) const;
     QModelIndex indexBelow(const QModelIndex &index) const;
 
-    void doItemsLayout();
-    void reset();
+    void doItemsLayout() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
 
     void sortByColumn(int column, Qt::SortOrder order);
 
-    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>());
-    void selectAll();
+    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>()) Q_DECL_OVERRIDE;
+    void selectAll() Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void expanded(const QModelIndex &index);
@@ -164,20 +164,20 @@ protected Q_SLOTS:
 
 protected:
     QTreeView(QTreeViewPrivate &dd, QWidget *parent = 0);
-    void scrollContentsBy(int dx, int dy);
-    void rowsInserted(const QModelIndex &parent, int start, int end);
-    void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end);
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
+    void rowsInserted(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
+    void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
 
-    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
-    int horizontalOffset() const;
-    int verticalOffset() const;
+    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) Q_DECL_OVERRIDE;
+    int horizontalOffset() const Q_DECL_OVERRIDE;
+    int verticalOffset() const Q_DECL_OVERRIDE;
 
-    void setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command);
-    QRegion visualRegionForSelection(const QItemSelection &selection) const;
-    QModelIndexList selectedIndexes() const;
+    void setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) Q_DECL_OVERRIDE;
+    QRegion visualRegionForSelection(const QItemSelection &selection) const Q_DECL_OVERRIDE;
+    QModelIndexList selectedIndexes() const Q_DECL_OVERRIDE;
 
-    void timerEvent(QTimerEvent *event);
-    void paintEvent(QPaintEvent *event);
+    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
 
     void drawTree(QPainter *painter, const QRegion &region) const;
     virtual void drawRow(QPainter *painter,
@@ -187,30 +187,30 @@ protected:
                               const QRect &rect,
                               const QModelIndex &index) const;
 
-    void mousePressEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
-    void mouseDoubleClickEvent(QMouseEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void keyPressEvent(QKeyEvent *event);
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void dragMoveEvent(QDragMoveEvent *event);
+    void dragMoveEvent(QDragMoveEvent *event) Q_DECL_OVERRIDE;
 #endif
-    bool viewportEvent(QEvent *event);
+    bool viewportEvent(QEvent *event) Q_DECL_OVERRIDE;
 
-    void updateGeometries();
+    void updateGeometries() Q_DECL_OVERRIDE;
 
     QSize viewportSizeHint() const Q_DECL_OVERRIDE;
 
-    int sizeHintForColumn(int column) const;
+    int sizeHintForColumn(int column) const Q_DECL_OVERRIDE;
     int indexRowSizeHint(const QModelIndex &index) const;
     int rowHeight(const QModelIndex &index) const;
 
-    void horizontalScrollbarAction(int action);
+    void horizontalScrollbarAction(int action) Q_DECL_OVERRIDE;
 
-    bool isIndexHidden(const QModelIndex &index) const;
+    bool isIndexHidden(const QModelIndex &index) const Q_DECL_OVERRIDE;
     void selectionChanged(const QItemSelection &selected,
-                          const QItemSelection &deselected);
-    void currentChanged(const QModelIndex &current, const QModelIndex &previous);
+                          const QItemSelection &deselected) Q_DECL_OVERRIDE;
+    void currentChanged(const QModelIndex &current, const QModelIndex &previous) Q_DECL_OVERRIDE;
 
 private:
     friend class QAccessibleTable;
diff --git a/src/widgets/itemviews/qtreewidget.h b/src/widgets/itemviews/qtreewidget.h
index b2b477289d..8ebfdd1b2a 100644
--- a/src/widgets/itemviews/qtreewidget.h
+++ b/src/widgets/itemviews/qtreewidget.h
@@ -316,7 +316,7 @@ public:
     QTreeWidgetItem *itemAbove(const QTreeWidgetItem *item) const;
     QTreeWidgetItem *itemBelow(const QTreeWidgetItem *item) const;
 
-    void setSelectionModel(QItemSelectionModel *selectionModel);
+    void setSelectionModel(QItemSelectionModel *selectionModel) Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void scrollToItem(const QTreeWidgetItem *item,
@@ -338,7 +338,7 @@ Q_SIGNALS:
     void itemSelectionChanged();
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
     virtual QStringList mimeTypes() const;
     virtual QMimeData *mimeData(const QList<QTreeWidgetItem*> items) const;
     virtual bool dropMimeData(QTreeWidgetItem *parent, int index,
@@ -348,10 +348,10 @@ protected:
 
     QModelIndex indexFromItem(QTreeWidgetItem *item, int column = 0) const;
     QTreeWidgetItem *itemFromIndex(const QModelIndex &index) const;
-    void dropEvent(QDropEvent *event);
+    void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;
 
 private:
-    void setModel(QAbstractItemModel *model);
+    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
 
     Q_DECLARE_PRIVATE(QTreeWidget)
     Q_DISABLE_COPY(QTreeWidget)
diff --git a/src/widgets/itemviews/qtreewidget_p.h b/src/widgets/itemviews/qtreewidget_p.h
index ec1395b9fb..3f7997d49b 100644
--- a/src/widgets/itemviews/qtreewidget_p.h
+++ b/src/widgets/itemviews/qtreewidget_p.h
@@ -84,24 +84,24 @@ public:
     void itemChanged(QTreeWidgetItem *item);
 
     QModelIndex index(const QTreeWidgetItem *item, int column) const;
-    QModelIndex index(int row, int column, const QModelIndex &parent) const;
-    QModelIndex parent(const QModelIndex &child) const;
-    int rowCount(const QModelIndex &parent) const;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const;
-    bool hasChildren(const QModelIndex &parent) const;
+    QModelIndex index(int row, int column, const QModelIndex &parent) const Q_DECL_OVERRIDE;
+    QModelIndex parent(const QModelIndex &child) const Q_DECL_OVERRIDE;
+    int rowCount(const QModelIndex &parent) const Q_DECL_OVERRIDE;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    bool hasChildren(const QModelIndex &parent) const Q_DECL_OVERRIDE;
 
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
-    bool setData(const QModelIndex &index, const QVariant &value, int role);
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
+    bool setData(const QModelIndex &index, const QVariant &value, int role) Q_DECL_OVERRIDE;
 
-    QMap<int, QVariant> itemData(const QModelIndex &index) const;
+    QMap<int, QVariant> itemData(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const Q_DECL_OVERRIDE;
     bool setHeaderData(int section, Qt::Orientation orientation, const QVariant &value,
-                       int role);
+                       int role) Q_DECL_OVERRIDE;
 
-    Qt::ItemFlags flags(const QModelIndex &index) const;
+    Qt::ItemFlags flags(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    void sort(int column, Qt::SortOrder order);
+    void sort(int column, Qt::SortOrder order) Q_DECL_OVERRIDE;
     void ensureSorted(int column, Qt::SortOrder order,
                       int start, int end, const QModelIndex &parent);
     static bool itemLessThan(const QPair<QTreeWidgetItem*,int> &left,
@@ -113,17 +113,17 @@ public:
         const QList<QTreeWidgetItem*>::iterator &end,
         Qt::SortOrder order, QTreeWidgetItem *item);
 
-    bool insertRows(int row, int count, const QModelIndex &);
-    bool insertColumns(int column, int count, const QModelIndex &);
+    bool insertRows(int row, int count, const QModelIndex &) Q_DECL_OVERRIDE;
+    bool insertColumns(int column, int count, const QModelIndex &) Q_DECL_OVERRIDE;
 
-    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
+    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex()) Q_DECL_OVERRIDE;
 
     // dnd
-    QStringList mimeTypes() const;
-    QMimeData *mimeData(const QModelIndexList &indexes) const;
+    QStringList mimeTypes() const Q_DECL_OVERRIDE;
+    QMimeData *mimeData(const QModelIndexList &indexes) const Q_DECL_OVERRIDE;
     bool dropMimeData(const QMimeData *data, Qt::DropAction action,
-                      int row, int column, const QModelIndex &parent);
-    Qt::DropActions supportedDropActions() const;
+                      int row, int column, const QModelIndex &parent) Q_DECL_OVERRIDE;
+    Qt::DropActions supportedDropActions() const Q_DECL_OVERRIDE;
 
     QMimeData *internalMimeData() const;
 
@@ -138,7 +138,7 @@ protected:
     void beginRemoveItems(QTreeWidgetItem *parent, int row, int count);
     void endRemoveItems();
     void sortItems(QList<QTreeWidgetItem*> *items, int column, Qt::SortOrder order);
-    void timerEvent(QTimerEvent *);
+    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE;
 
 private:
     QTreeWidgetItem *rootItem;
diff --git a/src/widgets/kernel/qaction.h b/src/widgets/kernel/qaction.h
index 15364b4785..4fc4b424f6 100644
--- a/src/widgets/kernel/qaction.h
+++ b/src/widgets/kernel/qaction.h
@@ -170,7 +170,7 @@ public:
 #endif
 
 protected:
-    bool event(QEvent *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
     QAction(QActionPrivate &dd, QObject *parent);
 
 public Q_SLOTS:
diff --git a/src/widgets/kernel/qapplication.h b/src/widgets/kernel/qapplication.h
index ceba0c96c4..560a619549 100644
--- a/src/widgets/kernel/qapplication.h
+++ b/src/widgets/kernel/qapplication.h
@@ -178,7 +178,7 @@ public:
 #endif
 
     static int exec();
-    bool notify(QObject *, QEvent *);
+    bool notify(QObject *, QEvent *) Q_DECL_OVERRIDE;
 
 #ifdef QT_KEYPAD_NAVIGATION
     static Q_DECL_DEPRECATED void setKeypadNavigationEnabled(bool);
@@ -206,8 +206,8 @@ public Q_SLOTS:
     static void aboutQt();
 
 protected:
-    bool event(QEvent *);
-    bool compressEvent(QEvent *, QObject *receiver, QPostEventList *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
+    bool compressEvent(QEvent *, QObject *receiver, QPostEventList *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QApplication)
diff --git a/src/widgets/kernel/qapplication_p.h b/src/widgets/kernel/qapplication_p.h
index b24b592fbe..809c7ccd66 100644
--- a/src/widgets/kernel/qapplication_p.h
+++ b/src/widgets/kernel/qapplication_p.h
@@ -108,10 +108,10 @@ public:
     QApplicationPrivate(int &argc, char **argv, int flags);
     ~QApplicationPrivate();
 
-    virtual void notifyLayoutDirectionChange();
-    virtual void notifyActiveWindowChange(QWindow *);
+    virtual void notifyLayoutDirectionChange() Q_DECL_OVERRIDE;
+    virtual void notifyActiveWindowChange(QWindow *) Q_DECL_OVERRIDE;
 
-    virtual bool shouldQuit();
+    virtual bool shouldQuit() Q_DECL_OVERRIDE;
     bool tryCloseAllWindows() Q_DECL_OVERRIDE;
 
 #if defined(Q_WS_X11)
@@ -127,7 +127,7 @@ public:
     static QString desktopStyleKey();
 
 
-    void createEventDispatcher();
+    void createEventDispatcher() Q_DECL_OVERRIDE;
     static void dispatchEnterLeave(QWidget *enter, QWidget *leave, const QPointF &globalPosF);
 
     void notifyWindowIconChanged() Q_DECL_OVERRIDE;
@@ -189,9 +189,9 @@ public:
     static QPalette *set_pal;
 
 protected:
-    void notifyThemeChanged();
+    void notifyThemeChanged() Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void notifyDragStarted(const QDrag *);
+    void notifyDragStarted(const QDrag *) Q_DECL_OVERRIDE;
 #endif // QT_NO_DRAGANDDROP
 
 public:
@@ -290,7 +290,7 @@ public:
                                        ulong timestamp);
     static void translateTouchCancel(QTouchDevice *device, ulong timestamp);
 
-    QPixmap applyQIconStyleHelper(QIcon::Mode mode, const QPixmap& base) const;
+    QPixmap applyQIconStyleHelper(QIcon::Mode mode, const QPixmap& base) const Q_DECL_OVERRIDE;
 private:
     static QApplicationPrivate *self;
     static bool tryCloseAllWidgetWindows(QWindowList *processedWindows);
diff --git a/src/widgets/kernel/qboxlayout.h b/src/widgets/kernel/qboxlayout.h
index c2da23f34c..9c83248773 100644
--- a/src/widgets/kernel/qboxlayout.h
+++ b/src/widgets/kernel/qboxlayout.h
@@ -67,7 +67,7 @@ public:
     void addWidget(QWidget *, int stretch = 0, Qt::Alignment alignment = 0);
     void addLayout(QLayout *layout, int stretch = 0);
     void addStrut(int);
-    void addItem(QLayoutItem *);
+    void addItem(QLayoutItem *) Q_DECL_OVERRIDE;
 
     void insertSpacing(int index, int size);
     void insertStretch(int index, int stretch = 0);
@@ -84,20 +84,20 @@ public:
     void setStretch(int index, int stretch);
     int stretch(int index) const;
 
-    QSize sizeHint() const;
-    QSize minimumSize() const;
-    QSize maximumSize() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QSize maximumSize() const Q_DECL_OVERRIDE;
 
-    bool hasHeightForWidth() const;
-    int heightForWidth(int) const;
-    int minimumHeightForWidth(int) const;
+    bool hasHeightForWidth() const Q_DECL_OVERRIDE;
+    int heightForWidth(int) const Q_DECL_OVERRIDE;
+    int minimumHeightForWidth(int) const Q_DECL_OVERRIDE;
 
-    Qt::Orientations expandingDirections() const;
-    void invalidate();
-    QLayoutItem *itemAt(int) const;
-    QLayoutItem *takeAt(int);
-    int count() const;
-    void setGeometry(const QRect&);
+    Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
+    void invalidate() Q_DECL_OVERRIDE;
+    QLayoutItem *itemAt(int) const Q_DECL_OVERRIDE;
+    QLayoutItem *takeAt(int) Q_DECL_OVERRIDE;
+    int count() const Q_DECL_OVERRIDE;
+    void setGeometry(const QRect&) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QBoxLayout)
diff --git a/src/widgets/kernel/qdesktopwidget.h b/src/widgets/kernel/qdesktopwidget.h
index e8ce49503b..322510aff4 100644
--- a/src/widgets/kernel/qdesktopwidget.h
+++ b/src/widgets/kernel/qdesktopwidget.h
@@ -79,7 +79,7 @@ Q_SIGNALS:
     void screenCountChanged(int);
 
 protected:
-    void resizeEvent(QResizeEvent *e);
+    void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QDesktopWidget)
diff --git a/src/widgets/kernel/qformlayout.h b/src/widgets/kernel/qformlayout.h
index 06100f858f..e06f1f7375 100644
--- a/src/widgets/kernel/qformlayout.h
+++ b/src/widgets/kernel/qformlayout.h
@@ -118,19 +118,19 @@ public:
     QWidget *labelForField(QLayout *field) const;
 
     // reimplemented from QLayout
-    void addItem(QLayoutItem *item);
-    QLayoutItem *itemAt(int index) const;
-    QLayoutItem *takeAt(int index);
-
-    void setGeometry(const QRect &rect);
-    QSize minimumSize() const;
-    QSize sizeHint() const;
-    void invalidate();
-
-    bool hasHeightForWidth() const;
-    int heightForWidth(int width) const;
-    Qt::Orientations expandingDirections() const;
-    int count() const;
+    void addItem(QLayoutItem *item) Q_DECL_OVERRIDE;
+    QLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
+    QLayoutItem *takeAt(int index) Q_DECL_OVERRIDE;
+
+    void setGeometry(const QRect &rect) Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    void invalidate() Q_DECL_OVERRIDE;
+
+    bool hasHeightForWidth() const Q_DECL_OVERRIDE;
+    int heightForWidth(int width) const Q_DECL_OVERRIDE;
+    Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
+    int count() const Q_DECL_OVERRIDE;
 
     int rowCount() const;
 
diff --git a/src/widgets/kernel/qgridlayout.h b/src/widgets/kernel/qgridlayout.h
index 95d8a0a445..89ece8f080 100644
--- a/src/widgets/kernel/qgridlayout.h
+++ b/src/widgets/kernel/qgridlayout.h
@@ -59,9 +59,9 @@ public:
 
     ~QGridLayout();
 
-    QSize sizeHint() const;
-    QSize minimumSize() const;
-    QSize maximumSize() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QSize maximumSize() const Q_DECL_OVERRIDE;
 
     void setHorizontalSpacing(int spacing);
     int horizontalSpacing() const;
@@ -85,12 +85,12 @@ public:
 
     QRect cellRect(int row, int column) const;
 
-    bool hasHeightForWidth() const;
-    int heightForWidth(int) const;
-    int minimumHeightForWidth(int) const;
+    bool hasHeightForWidth() const Q_DECL_OVERRIDE;
+    int heightForWidth(int) const Q_DECL_OVERRIDE;
+    int minimumHeightForWidth(int) const Q_DECL_OVERRIDE;
 
-    Qt::Orientations expandingDirections() const;
-    void invalidate();
+    Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
+    void invalidate() Q_DECL_OVERRIDE;
 
     inline void addWidget(QWidget *w) { QLayout::addWidget(w); }
     void addWidget(QWidget *, int row, int column, Qt::Alignment = 0);
@@ -101,11 +101,11 @@ public:
     void setOriginCorner(Qt::Corner);
     Qt::Corner originCorner() const;
 
-    QLayoutItem *itemAt(int index) const;
+    QLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
     QLayoutItem *itemAtPosition(int row, int column) const;
-    QLayoutItem *takeAt(int index);
-    int count() const;
-    void setGeometry(const QRect&);
+    QLayoutItem *takeAt(int index) Q_DECL_OVERRIDE;
+    int count() const Q_DECL_OVERRIDE;
+    void setGeometry(const QRect&) Q_DECL_OVERRIDE;
 
     void addItem(QLayoutItem *item, int row, int column, int rowSpan = 1, int columnSpan = 1, Qt::Alignment = 0);
 
@@ -113,7 +113,7 @@ public:
     void getItemPosition(int idx, int *row, int *column, int *rowSpan, int *columnSpan) const;
 
 protected:
-    void addItem(QLayoutItem *);
+    void addItem(QLayoutItem *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QGridLayout)
diff --git a/src/widgets/kernel/qlayout.h b/src/widgets/kernel/qlayout.h
index 38568e434c..79cb7a7d14 100644
--- a/src/widgets/kernel/qlayout.h
+++ b/src/widgets/kernel/qlayout.h
@@ -101,8 +101,8 @@ public:
 
     QWidget *parentWidget() const;
 
-    void invalidate();
-    QRect geometry() const;
+    void invalidate() Q_DECL_OVERRIDE;
+    QRect geometry() const Q_DECL_OVERRIDE;
     bool activate();
     void update();
 
@@ -112,16 +112,16 @@ public:
     void removeWidget(QWidget *w);
     void removeItem(QLayoutItem *);
 
-    Qt::Orientations expandingDirections() const;
-    QSize minimumSize() const;
-    QSize maximumSize() const;
-    virtual void setGeometry(const QRect&);
+    Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QSize maximumSize() const Q_DECL_OVERRIDE;
+    virtual void setGeometry(const QRect&) Q_DECL_OVERRIDE;
     virtual QLayoutItem *itemAt(int index) const = 0;
     virtual QLayoutItem *takeAt(int index) = 0;
     virtual int indexOf(QWidget *) const;
     virtual int count() const = 0;
-    bool isEmpty() const;
-    QSizePolicy::ControlTypes controlTypes() const;
+    bool isEmpty() const Q_DECL_OVERRIDE;
+    QSizePolicy::ControlTypes controlTypes() const Q_DECL_OVERRIDE;
 
     // ### Qt 6 make this function virtual
     QLayoutItem *replaceWidget(QWidget *from, QWidget *to, Qt::FindChildOptions options = Qt::FindChildrenRecursively);
@@ -130,7 +130,7 @@ public:
     QSize totalMinimumSize() const;
     QSize totalMaximumSize() const;
     QSize totalSizeHint() const;
-    QLayout *layout();
+    QLayout *layout() Q_DECL_OVERRIDE;
 
     void setEnabled(bool);
     bool isEnabled() const;
@@ -140,7 +140,7 @@ public:
 
 protected:
     void widgetEvent(QEvent *);
-    void childEvent(QChildEvent *e);
+    void childEvent(QChildEvent *e) Q_DECL_OVERRIDE;
     void addChildLayout(QLayout *l);
     void addChildWidget(QWidget *w);
     bool adoptLayout(QLayout *layout);
diff --git a/src/widgets/kernel/qshortcut.h b/src/widgets/kernel/qshortcut.h
index 86db4bcdab..0edaab7175 100644
--- a/src/widgets/kernel/qshortcut.h
+++ b/src/widgets/kernel/qshortcut.h
@@ -84,7 +84,7 @@ Q_SIGNALS:
     void activatedAmbiguously();
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 };
 
 #endif // QT_NO_SHORTCUT
diff --git a/src/widgets/kernel/qstackedlayout.h b/src/widgets/kernel/qstackedlayout.h
index b715f02069..24d11597c9 100644
--- a/src/widgets/kernel/qstackedlayout.h
+++ b/src/widgets/kernel/qstackedlayout.h
@@ -72,20 +72,20 @@ public:
     using QLayout::widget;
 #endif
     QWidget *widget(int) const;
-    int count() const;
+    int count() const Q_DECL_OVERRIDE;
 
     StackingMode stackingMode() const;
     void setStackingMode(StackingMode stackingMode);
 
     // abstract virtual functions:
-    void addItem(QLayoutItem *item);
-    QSize sizeHint() const;
-    QSize minimumSize() const;
-    QLayoutItem *itemAt(int) const;
-    QLayoutItem *takeAt(int);
-    void setGeometry(const QRect &rect);
-    bool hasHeightForWidth() const;
-    int heightForWidth(int width) const;
+    void addItem(QLayoutItem *item) Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QLayoutItem *itemAt(int) const Q_DECL_OVERRIDE;
+    QLayoutItem *takeAt(int) Q_DECL_OVERRIDE;
+    void setGeometry(const QRect &rect) Q_DECL_OVERRIDE;
+    bool hasHeightForWidth() const Q_DECL_OVERRIDE;
+    int heightForWidth(int width) const Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void widgetRemoved(int index);
diff --git a/src/widgets/kernel/qstandardgestures_p.h b/src/widgets/kernel/qstandardgestures_p.h
index 15ba31f26a..2f2aac45c1 100644
--- a/src/widgets/kernel/qstandardgestures_p.h
+++ b/src/widgets/kernel/qstandardgestures_p.h
@@ -57,9 +57,9 @@ class QPanGestureRecognizer : public QGestureRecognizer
 public:
     explicit QPanGestureRecognizer(int pointCount = 2) : m_pointCount(pointCount) {}
 
-    QGesture *create(QObject *target);
-    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
-    void reset(QGesture *state);
+    QGesture *create(QObject *target) Q_DECL_OVERRIDE;
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event) Q_DECL_OVERRIDE;
+    void reset(QGesture *state) Q_DECL_OVERRIDE;
 
 private:
     const int m_pointCount;
@@ -70,9 +70,9 @@ class QPinchGestureRecognizer : public QGestureRecognizer
 public:
     QPinchGestureRecognizer();
 
-    QGesture *create(QObject *target);
-    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
-    void reset(QGesture *state);
+    QGesture *create(QObject *target) Q_DECL_OVERRIDE;
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event) Q_DECL_OVERRIDE;
+    void reset(QGesture *state) Q_DECL_OVERRIDE;
 };
 
 class QSwipeGestureRecognizer : public QGestureRecognizer
@@ -80,9 +80,9 @@ class QSwipeGestureRecognizer : public QGestureRecognizer
 public:
     QSwipeGestureRecognizer();
 
-    QGesture *create(QObject *target);
-    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
-    void reset(QGesture *state);
+    QGesture *create(QObject *target) Q_DECL_OVERRIDE;
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event) Q_DECL_OVERRIDE;
+    void reset(QGesture *state) Q_DECL_OVERRIDE;
 };
 
 class QTapGestureRecognizer : public QGestureRecognizer
@@ -90,9 +90,9 @@ class QTapGestureRecognizer : public QGestureRecognizer
 public:
     QTapGestureRecognizer();
 
-    QGesture *create(QObject *target);
-    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
-    void reset(QGesture *state);
+    QGesture *create(QObject *target) Q_DECL_OVERRIDE;
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event) Q_DECL_OVERRIDE;
+    void reset(QGesture *state) Q_DECL_OVERRIDE;
 };
 
 class QTapAndHoldGestureRecognizer : public QGestureRecognizer
@@ -100,9 +100,9 @@ class QTapAndHoldGestureRecognizer : public QGestureRecognizer
 public:
     QTapAndHoldGestureRecognizer();
 
-    QGesture *create(QObject *target);
-    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
-    void reset(QGesture *state);
+    QGesture *create(QObject *target) Q_DECL_OVERRIDE;
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event) Q_DECL_OVERRIDE;
+    void reset(QGesture *state) Q_DECL_OVERRIDE;
 };
 
 QT_END_NAMESPACE
diff --git a/src/widgets/kernel/qtooltip.cpp b/src/widgets/kernel/qtooltip.cpp
index 7fcc5d3bc6..bb095e2ee0 100644
--- a/src/widgets/kernel/qtooltip.cpp
+++ b/src/widgets/kernel/qtooltip.cpp
@@ -116,7 +116,7 @@ public:
     ~QTipLabel();
     static QTipLabel *instance;
 
-    bool eventFilter(QObject *, QEvent *);
+    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
 
     QBasicTimer hideTimer, expireTimer;
 
@@ -132,10 +132,10 @@ public:
 
     static int getTipScreen(const QPoint &pos, QWidget *w);
 protected:
-    void timerEvent(QTimerEvent *e);
-    void paintEvent(QPaintEvent *e);
-    void mouseMoveEvent(QMouseEvent *e);
-    void resizeEvent(QResizeEvent *e);
+    void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
 
 #ifndef QT_NO_STYLE_STYLESHEET
 public slots:
diff --git a/src/widgets/kernel/qwhatsthis.cpp b/src/widgets/kernel/qwhatsthis.cpp
index 632cb242dc..b4d18844a9 100644
--- a/src/widgets/kernel/qwhatsthis.cpp
+++ b/src/widgets/kernel/qwhatsthis.cpp
@@ -141,12 +141,12 @@ public:
     static QWhatsThat *instance;
 
 protected:
-    void showEvent(QShowEvent *e);
-    void mousePressEvent(QMouseEvent*);
-    void mouseReleaseEvent(QMouseEvent*);
-    void mouseMoveEvent(QMouseEvent*);
-    void keyPressEvent(QKeyEvent*);
-    void paintEvent(QPaintEvent*);
+    void showEvent(QShowEvent *e) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent*) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent*) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent*) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent*) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent*) Q_DECL_OVERRIDE;
 
 private:
     QPointer<QWidget>widget;
@@ -361,7 +361,7 @@ class QWhatsThisPrivate : public QObject
     QWhatsThisPrivate();
     ~QWhatsThisPrivate();
     static QWhatsThisPrivate *instance;
-    bool eventFilter(QObject *, QEvent *);
+    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
     QPointer<QAction> action;
     static void say(QWidget *, const QString &, int x = 0, int y = 0);
     static void notifyToplevels(QEvent *e);
diff --git a/src/widgets/kernel/qwidget.h b/src/widgets/kernel/qwidget.h
index ad1e276567..52c12d3730 100644
--- a/src/widgets/kernel/qwidget.h
+++ b/src/widgets/kernel/qwidget.h
@@ -203,7 +203,7 @@ public:
     explicit QWidget(QWidget* parent = 0, Qt::WindowFlags f = 0);
     ~QWidget();
 
-    int devType() const;
+    int devType() const Q_DECL_OVERRIDE;
 
     WId winId() const;
     void createWinId(); // internal, going away
@@ -568,7 +568,7 @@ public:
     void setAttribute(Qt::WidgetAttribute, bool on = true);
     inline bool testAttribute(Qt::WidgetAttribute) const;
 
-    QPaintEngine *paintEngine() const;
+    QPaintEngine *paintEngine() const Q_DECL_OVERRIDE;
 
     void ensurePolished() const;
 
@@ -598,7 +598,7 @@ Q_SIGNALS:
 
 protected:
     // Event handlers
-    bool event(QEvent *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
     virtual void mousePressEvent(QMouseEvent *);
     virtual void mouseReleaseEvent(QMouseEvent *);
     virtual void mouseDoubleClickEvent(QMouseEvent *);
@@ -640,10 +640,10 @@ protected:
     // Misc. protected functions
     virtual void changeEvent(QEvent *);
 
-    int metric(PaintDeviceMetric) const;
-    void initPainter(QPainter *painter) const;
-    QPaintDevice *redirected(QPoint *offset) const;
-    QPainter *sharedPainter() const;
+    int metric(PaintDeviceMetric) const Q_DECL_OVERRIDE;
+    void initPainter(QPainter *painter) const Q_DECL_OVERRIDE;
+    QPaintDevice *redirected(QPoint *offset) const Q_DECL_OVERRIDE;
+    QPainter *sharedPainter() const Q_DECL_OVERRIDE;
 
     virtual void inputMethodEvent(QInputMethodEvent *);
 public:
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index d5a91f18d6..738f017e89 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -907,10 +907,10 @@ public:
     inline QRect deviceRect() const
     { return m_widget->window()->rect(); }
 
-    QRectF boundingRect(Qt::CoordinateSystem system) const;
-    void draw(QPainter *p);
+    QRectF boundingRect(Qt::CoordinateSystem system) const Q_DECL_OVERRIDE;
+    void draw(QPainter *p) Q_DECL_OVERRIDE;
     QPixmap pixmap(Qt::CoordinateSystem system, QPoint *offset,
-                   QGraphicsEffect::PixmapPadMode mode) const;
+                   QGraphicsEffect::PixmapPadMode mode) const Q_DECL_OVERRIDE;
 
     QWidget *m_widget;
     QWidgetPaintContext *context;
diff --git a/src/widgets/kernel/qwidgetaction.h b/src/widgets/kernel/qwidgetaction.h
index afea8454d9..896fc1ffe4 100644
--- a/src/widgets/kernel/qwidgetaction.h
+++ b/src/widgets/kernel/qwidgetaction.h
@@ -59,8 +59,8 @@ public:
     void releaseWidget(QWidget *widget);
 
 protected:
-    virtual bool event(QEvent *);
-    virtual bool eventFilter(QObject *, QEvent *);
+    virtual bool event(QEvent *) Q_DECL_OVERRIDE;
+    virtual bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
     virtual QWidget *createWidget(QWidget *parent);
     virtual void deleteWidget(QWidget *widget);
     QList<QWidget *> createdWidgets() const;
diff --git a/src/widgets/kernel/qwidgetwindow.cpp b/src/widgets/kernel/qwidgetwindow.cpp
index 4bca0eab4a..fa9138344a 100644
--- a/src/widgets/kernel/qwidgetwindow.cpp
+++ b/src/widgets/kernel/qwidgetwindow.cpp
@@ -63,7 +63,7 @@ class QWidgetWindowPrivate : public QWindowPrivate
 {
     Q_DECLARE_PUBLIC(QWidgetWindow)
 public:
-    QWindow *eventReceiver() {
+    QWindow *eventReceiver() Q_DECL_OVERRIDE {
         Q_Q(QWidgetWindow);
         QWindow *w = q;
         while (w->parent() && qobject_cast<QWidgetWindow *>(w) && qobject_cast<QWidgetWindow *>(w->parent())) {
@@ -72,7 +72,7 @@ public:
         return w;
     }
 
-    void clearFocusObject()
+    void clearFocusObject() Q_DECL_OVERRIDE
     {
         Q_Q(QWidgetWindow);
         QWidget *widget = q->widget();
diff --git a/src/widgets/kernel/qwidgetwindow_p.h b/src/widgets/kernel/qwidgetwindow_p.h
index 0632a5c364..3bacb0c8e4 100644
--- a/src/widgets/kernel/qwidgetwindow_p.h
+++ b/src/widgets/kernel/qwidgetwindow_p.h
@@ -65,12 +65,12 @@ public:
 
     QWidget *widget() const { return m_widget; }
 #ifndef QT_NO_ACCESSIBILITY
-    QAccessibleInterface *accessibleRoot() const;
+    QAccessibleInterface *accessibleRoot() const Q_DECL_OVERRIDE;
 #endif
 
-    QObject *focusObject() const;
+    QObject *focusObject() const Q_DECL_OVERRIDE;
 protected:
-    bool event(QEvent *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
 
     void handleCloseEvent(QCloseEvent *);
     void handleEnterLeaveEvent(QEvent *);
@@ -91,7 +91,7 @@ protected:
 #endif
     void handleExposeEvent(QExposeEvent *);
     void handleWindowStateChangedEvent(QWindowStateChangeEvent *event);
-    bool nativeEvent(const QByteArray &eventType, void *message, long *result);
+    bool nativeEvent(const QByteArray &eventType, void *message, long *result) Q_DECL_OVERRIDE;
 #ifndef QT_NO_TABLETEVENT
     void handleTabletEvent(QTabletEvent *);
 #endif
diff --git a/src/widgets/kernel/qwindowcontainer_p.h b/src/widgets/kernel/qwindowcontainer_p.h
index 6ba1ab544e..751c932ef0 100644
--- a/src/widgets/kernel/qwindowcontainer_p.h
+++ b/src/widgets/kernel/qwindowcontainer_p.h
@@ -68,7 +68,7 @@ public:
     static void parentWasLowered(QWidget *parent);
 
 protected:
-    bool event(QEvent *ev);
+    bool event(QEvent *ev) Q_DECL_OVERRIDE;
 
 private slots:
     void focusWindowChanged(QWindow *focusWindow);
diff --git a/src/widgets/statemachine/qbasickeyeventtransition_p.h b/src/widgets/statemachine/qbasickeyeventtransition_p.h
index cae7342b2e..4a856be57c 100644
--- a/src/widgets/statemachine/qbasickeyeventtransition_p.h
+++ b/src/widgets/statemachine/qbasickeyeventtransition_p.h
@@ -75,8 +75,8 @@ public:
     void setModifierMask(Qt::KeyboardModifiers modifiers);
 
 protected:
-    bool eventTest(QEvent *event);
-    void onTransition(QEvent *);
+    bool eventTest(QEvent *event) Q_DECL_OVERRIDE;
+    void onTransition(QEvent *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QBasicKeyEventTransition)
diff --git a/src/widgets/statemachine/qbasicmouseeventtransition_p.h b/src/widgets/statemachine/qbasicmouseeventtransition_p.h
index 5adb8702cc..beedec2201 100644
--- a/src/widgets/statemachine/qbasicmouseeventtransition_p.h
+++ b/src/widgets/statemachine/qbasicmouseeventtransition_p.h
@@ -78,8 +78,8 @@ public:
     void setHitTestPath(const QPainterPath &path);
 
 protected:
-    bool eventTest(QEvent *event);
-    void onTransition(QEvent *);
+    bool eventTest(QEvent *event) Q_DECL_OVERRIDE;
+    void onTransition(QEvent *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QBasicMouseEventTransition)
diff --git a/src/widgets/statemachine/qkeyeventtransition.h b/src/widgets/statemachine/qkeyeventtransition.h
index 816770c04a..571040a748 100644
--- a/src/widgets/statemachine/qkeyeventtransition.h
+++ b/src/widgets/statemachine/qkeyeventtransition.h
@@ -60,8 +60,8 @@ public:
     void setModifierMask(Qt::KeyboardModifiers modifiers);
 
 protected:
-    void onTransition(QEvent *event);
-    bool eventTest(QEvent *event);
+    void onTransition(QEvent *event) Q_DECL_OVERRIDE;
+    bool eventTest(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QKeyEventTransition)
diff --git a/src/widgets/statemachine/qmouseeventtransition.h b/src/widgets/statemachine/qmouseeventtransition.h
index 2bad8b13bd..d2caf8d5fe 100644
--- a/src/widgets/statemachine/qmouseeventtransition.h
+++ b/src/widgets/statemachine/qmouseeventtransition.h
@@ -64,8 +64,8 @@ public:
     void setHitTestPath(const QPainterPath &path);
 
 protected:
-    void onTransition(QEvent *event);
-    bool eventTest(QEvent *event);
+    void onTransition(QEvent *event) Q_DECL_OVERRIDE;
+    bool eventTest(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QMouseEventTransition)
diff --git a/src/widgets/styles/qcommonstyle.h b/src/widgets/styles/qcommonstyle.h
index 7e885d0b77..465d0f17aa 100644
--- a/src/widgets/styles/qcommonstyle.h
+++ b/src/widgets/styles/qcommonstyle.h
@@ -49,40 +49,40 @@ public:
     ~QCommonStyle();
 
     void drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, QPainter *p,
-                       const QWidget *w = 0) const;
+                       const QWidget *w = 0) const Q_DECL_OVERRIDE;
     void drawControl(ControlElement element, const QStyleOption *opt, QPainter *p,
-                     const QWidget *w = 0) const;
-    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const;
+                     const QWidget *w = 0) const Q_DECL_OVERRIDE;
+    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     void drawComplexControl(ComplexControl cc, const QStyleOptionComplex *opt, QPainter *p,
-                            const QWidget *w = 0) const;
+                            const QWidget *w = 0) const Q_DECL_OVERRIDE;
     SubControl hitTestComplexControl(ComplexControl cc, const QStyleOptionComplex *opt,
-                                     const QPoint &pt, const QWidget *w = 0) const;
+                                     const QPoint &pt, const QWidget *w = 0) const Q_DECL_OVERRIDE;
     QRect subControlRect(ComplexControl cc, const QStyleOptionComplex *opt, SubControl sc,
-                         const QWidget *w = 0) const;
+                         const QWidget *w = 0) const Q_DECL_OVERRIDE;
     QSize sizeFromContents(ContentsType ct, const QStyleOption *opt,
-                           const QSize &contentsSize, const QWidget *widget = 0) const;
+                           const QSize &contentsSize, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
-    int pixelMetric(PixelMetric m, const QStyleOption *opt = 0, const QWidget *widget = 0) const;
+    int pixelMetric(PixelMetric m, const QStyleOption *opt = 0, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
     int styleHint(StyleHint sh, const QStyleOption *opt = 0, const QWidget *w = 0,
-                  QStyleHintReturn *shret = 0) const;
+                  QStyleHintReturn *shret = 0) const Q_DECL_OVERRIDE;
 
     QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *opt = 0,
-                       const QWidget *widget = 0) const;
+                       const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     QPixmap standardPixmap(StandardPixmap sp, const QStyleOption *opt = 0,
-                           const QWidget *widget = 0) const;
+                           const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
     QPixmap generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap,
-                                const QStyleOption *opt) const;
+                                const QStyleOption *opt) const Q_DECL_OVERRIDE;
     int layoutSpacing(QSizePolicy::ControlType control1, QSizePolicy::ControlType control2,
                       Qt::Orientation orientation, const QStyleOption *option = 0,
-                      const QWidget *widget = 0) const;
+                      const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
-    void polish(QPalette &);
-    void polish(QApplication *app);
-    void polish(QWidget *widget);
-    void unpolish(QWidget *widget);
-    void unpolish(QApplication *application);
+    void polish(QPalette &) Q_DECL_OVERRIDE;
+    void polish(QApplication *app) Q_DECL_OVERRIDE;
+    void polish(QWidget *widget) Q_DECL_OVERRIDE;
+    void unpolish(QWidget *widget) Q_DECL_OVERRIDE;
+    void unpolish(QApplication *application) Q_DECL_OVERRIDE;
 
 protected:
     QCommonStyle(QCommonStylePrivate &dd);
diff --git a/src/widgets/styles/qfusionstyle_p.h b/src/widgets/styles/qfusionstyle_p.h
index 7d0326d0a1..e7ba66f818 100644
--- a/src/widgets/styles/qfusionstyle_p.h
+++ b/src/widgets/styles/qfusionstyle_p.h
@@ -62,41 +62,41 @@ public:
     QFusionStyle();
     ~QFusionStyle();
 
-    QPalette standardPalette () const;
+    QPalette standardPalette () const Q_DECL_OVERRIDE;
     void drawPrimitive(PrimitiveElement elem,
                        const QStyleOption *option,
-                       QPainter *painter, const QWidget *widget = 0) const;
+                       QPainter *painter, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     void drawControl(ControlElement ce, const QStyleOption *option, QPainter *painter,
-                     const QWidget *widget) const;
-    int pixelMetric(PixelMetric metric, const QStyleOption *option = 0, const QWidget *widget = 0) const;
+                     const QWidget *widget) const Q_DECL_OVERRIDE;
+    int pixelMetric(PixelMetric metric, const QStyleOption *option = 0, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     void drawComplexControl(ComplexControl control, const QStyleOptionComplex *option,
-                            QPainter *painter, const QWidget *widget) const;
-    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const;
+                            QPainter *painter, const QWidget *widget) const Q_DECL_OVERRIDE;
+    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     QSize sizeFromContents(ContentsType type, const QStyleOption *option,
-                           const QSize &size, const QWidget *widget) const;
+                           const QSize &size, const QWidget *widget) const Q_DECL_OVERRIDE;
     SubControl hitTestComplexControl(ComplexControl cc, const QStyleOptionComplex *opt,
-                                     const QPoint &pt, const QWidget *w = 0) const;
+                                     const QPoint &pt, const QWidget *w = 0) const Q_DECL_OVERRIDE;
     QRect subControlRect(ComplexControl cc, const QStyleOptionComplex *opt,
-                         SubControl sc, const QWidget *widget) const;
+                         SubControl sc, const QWidget *widget) const Q_DECL_OVERRIDE;
     QPixmap generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap,
-                                const QStyleOption *opt) const;
+                                const QStyleOption *opt) const Q_DECL_OVERRIDE;
     int styleHint(StyleHint hint, const QStyleOption *option = 0, const QWidget *widget = 0,
-                  QStyleHintReturn *returnData = 0) const;
-    QRect itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const;
+                  QStyleHintReturn *returnData = 0) const Q_DECL_OVERRIDE;
+    QRect itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const Q_DECL_OVERRIDE;
     QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *option = 0,
-                       const QWidget *widget = 0) const;
+                       const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     QPixmap standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt,
-                           const QWidget *widget = 0) const;
+                           const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     void drawItemPixmap(QPainter *painter, const QRect &rect,
-                        int alignment, const QPixmap &pixmap) const;
+                        int alignment, const QPixmap &pixmap) const Q_DECL_OVERRIDE;
     void drawItemText(QPainter *painter, const QRect &rect,
                       int flags, const QPalette &pal, bool enabled,
-                      const QString &text, QPalette::ColorRole textRole = QPalette::NoRole) const;
-    void polish(QWidget *widget);
-    void polish(QApplication *app);
-    void polish(QPalette &pal);
-    void unpolish(QWidget *widget);
-    void unpolish(QApplication *app);
+                      const QString &text, QPalette::ColorRole textRole = QPalette::NoRole) const Q_DECL_OVERRIDE;
+    void polish(QWidget *widget) Q_DECL_OVERRIDE;
+    void polish(QApplication *app) Q_DECL_OVERRIDE;
+    void polish(QPalette &pal) Q_DECL_OVERRIDE;
+    void unpolish(QWidget *widget) Q_DECL_OVERRIDE;
+    void unpolish(QApplication *app) Q_DECL_OVERRIDE;
 
 protected:
     QFusionStyle(QFusionStylePrivate &dd);
diff --git a/src/widgets/styles/qgtk2painter_p.h b/src/widgets/styles/qgtk2painter_p.h
index 432daaca29..6204e11fa9 100644
--- a/src/widgets/styles/qgtk2painter_p.h
+++ b/src/widgets/styles/qgtk2painter_p.h
@@ -59,33 +59,33 @@ public:
 
     void paintBoxGap(GtkWidget *gtkWidget, const gchar* part, const QRect &rect,
                      GtkStateType state, GtkShadowType shadow, GtkPositionType gap_side, gint x,
-                     gint width, GtkStyle *style);
+                     gint width, GtkStyle *style) Q_DECL_OVERRIDE;
     void paintBox(GtkWidget *gtkWidget, const gchar* part,
                   const QRect &rect, GtkStateType state, GtkShadowType shadow, GtkStyle *style,
-                  const QString &pmKey = QString());
+                  const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintHline(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkStyle *style,
-                    int x1, int x2, int y, const QString &pmKey = QString());
+                    int x1, int x2, int y, const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintVline(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkStyle *style,
-                    int y1, int y2, int x, const QString &pmKey = QString());
+                    int y1, int y2, int x, const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintExpander(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state,
-                       GtkExpanderStyle expander_state, GtkStyle *style, const QString &pmKey = QString());
+                       GtkExpanderStyle expander_state, GtkStyle *style, const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintFocus(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkStyle *style,
-                    const QString &pmKey = QString());
+                    const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintResizeGrip(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkShadowType shadow,
-                         GdkWindowEdge edge, GtkStyle *style, const QString &pmKey = QString());
+                         GdkWindowEdge edge, GtkStyle *style, const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintArrow(GtkWidget *gtkWidget, const gchar* part, const QRect &arrowrect, GtkArrowType arrow_type, GtkStateType state, GtkShadowType shadow,
-                    gboolean fill, GtkStyle *style, const QString &pmKey = QString());
+                    gboolean fill, GtkStyle *style, const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintHandle(GtkWidget *gtkWidget, const gchar* part, const QRect &rect,
-                     GtkStateType state, GtkShadowType shadow, GtkOrientation orientation, GtkStyle *style);
+                     GtkStateType state, GtkShadowType shadow, GtkOrientation orientation, GtkStyle *style) Q_DECL_OVERRIDE;
     void paintSlider(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkShadowType shadow,
-                     GtkStyle *style, GtkOrientation orientation, const QString &pmKey = QString());
+                     GtkStyle *style, GtkOrientation orientation, const QString &pmKey = QString()) Q_DECL_OVERRIDE;
     void paintShadow(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkShadowType shadow,
-                     GtkStyle *style, const QString &pmKey = QString());
-    void paintFlatBox(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkShadowType shadow, GtkStyle *style, const QString & = QString());
+                     GtkStyle *style, const QString &pmKey = QString()) Q_DECL_OVERRIDE;
+    void paintFlatBox(GtkWidget *gtkWidget, const gchar* part, const QRect &rect, GtkStateType state, GtkShadowType shadow, GtkStyle *style, const QString & = QString()) Q_DECL_OVERRIDE;
     void paintExtention(GtkWidget *gtkWidget, const gchar *part, const QRect &rect, GtkStateType state, GtkShadowType shadow,
-                        GtkPositionType gap_pos, GtkStyle *style);
-    void paintOption(GtkWidget *gtkWidget, const QRect &rect, GtkStateType state, GtkShadowType shadow, GtkStyle *style, const QString &detail);
-    void paintCheckbox(GtkWidget *gtkWidget, const QRect &rect, GtkStateType state, GtkShadowType shadow, GtkStyle *style, const QString &detail);
+                        GtkPositionType gap_pos, GtkStyle *style) Q_DECL_OVERRIDE;
+    void paintOption(GtkWidget *gtkWidget, const QRect &rect, GtkStateType state, GtkShadowType shadow, GtkStyle *style, const QString &detail) Q_DECL_OVERRIDE;
+    void paintCheckbox(GtkWidget *gtkWidget, const QRect &rect, GtkStateType state, GtkShadowType shadow, GtkStyle *style, const QString &detail) Q_DECL_OVERRIDE;
 
 private:
     QPixmap renderTheme(uchar *bdata, uchar *wdata, const QRect &rect) const;
diff --git a/src/widgets/styles/qgtkstyle_p.h b/src/widgets/styles/qgtkstyle_p.h
index d8a4fb093d..5aecf66152 100644
--- a/src/widgets/styles/qgtkstyle_p.h
+++ b/src/widgets/styles/qgtkstyle_p.h
@@ -69,48 +69,48 @@ public:
 
     ~QGtkStyle();
 
-    QPalette standardPalette() const;
+    QPalette standardPalette() const Q_DECL_OVERRIDE;
 
     void drawPrimitive(PrimitiveElement element, const QStyleOption *option,
-                       QPainter *painter, const QWidget *widget) const;
+                       QPainter *painter, const QWidget *widget) const Q_DECL_OVERRIDE;
     void drawControl(ControlElement control, const QStyleOption *option,
-                     QPainter *painter, const QWidget *widget) const;
+                     QPainter *painter, const QWidget *widget) const Q_DECL_OVERRIDE;
     void drawComplexControl(ComplexControl control, const QStyleOptionComplex *option,
-                            QPainter *painter, const QWidget *widget) const;
+                            QPainter *painter, const QWidget *widget) const Q_DECL_OVERRIDE;
     void drawItemPixmap(QPainter *painter, const QRect &rect, int alignment,
-                        const QPixmap &pixmap) const;
+                        const QPixmap &pixmap) const Q_DECL_OVERRIDE;
     void drawItemText(QPainter *painter, const QRect &rect, int alignment, const QPalette &pal,
-                      bool enabled, const QString& text, QPalette::ColorRole textRole) const;
+                      bool enabled, const QString& text, QPalette::ColorRole textRole) const Q_DECL_OVERRIDE;
 
     int pixelMetric(PixelMetric metric, const QStyleOption *option = 0,
-                    const QWidget *widget = 0) const;
+                    const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     int styleHint(StyleHint hint, const QStyleOption *option,
-                  const QWidget *widget, QStyleHintReturn *returnData) const;
+                  const QWidget *widget, QStyleHintReturn *returnData) const Q_DECL_OVERRIDE;
 
     QStyle::SubControl hitTestComplexControl(ComplexControl cc, const QStyleOptionComplex *opt,
-                              const QPoint &pt, const QWidget *w) const;
+                              const QPoint &pt, const QWidget *w) const Q_DECL_OVERRIDE;
 
     QRect subControlRect(ComplexControl control, const QStyleOptionComplex *option,
-                         SubControl subControl, const QWidget *widget) const;
-    QRect subElementRect(SubElement sr, const QStyleOption *opt, const QWidget *w) const;
-    QRect itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const;
+                         SubControl subControl, const QWidget *widget) const Q_DECL_OVERRIDE;
+    QRect subElementRect(SubElement sr, const QStyleOption *opt, const QWidget *w) const Q_DECL_OVERRIDE;
+    QRect itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const Q_DECL_OVERRIDE;
 
 
     QSize sizeFromContents(ContentsType type, const QStyleOption *option,
-                           const QSize &size, const QWidget *widget) const;
+                           const QSize &size, const QWidget *widget) const Q_DECL_OVERRIDE;
     QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *option = 0,
-                       const QWidget *widget = 0) const;
+                       const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     QPixmap standardPixmap(StandardPixmap sp, const QStyleOption *option,
-                           const QWidget *widget) const;
+                           const QWidget *widget) const Q_DECL_OVERRIDE;
     QPixmap generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap,
-                                const QStyleOption *opt) const;
+                                const QStyleOption *opt) const Q_DECL_OVERRIDE;
 
-    void polish(QWidget *widget);
-    void polish(QApplication *app);
-    void polish(QPalette &palette);
+    void polish(QWidget *widget) Q_DECL_OVERRIDE;
+    void polish(QApplication *app) Q_DECL_OVERRIDE;
+    void polish(QPalette &palette) Q_DECL_OVERRIDE;
 
-    void unpolish(QWidget *widget);
-    void unpolish(QApplication *app);
+    void unpolish(QWidget *widget) Q_DECL_OVERRIDE;
+    void unpolish(QApplication *app) Q_DECL_OVERRIDE;
 
     static bool getGConfBool(const QString &key, bool fallback = 0);
     static QString getGConfString(const QString &key, const QString &fallback = QString());
diff --git a/src/widgets/styles/qgtkstyle_p_p.h b/src/widgets/styles/qgtkstyle_p_p.h
index 0076f14ba3..02b375bc54 100644
--- a/src/widgets/styles/qgtkstyle_p_p.h
+++ b/src/widgets/styles/qgtkstyle_p_p.h
@@ -228,7 +228,7 @@ public:
     {}
 private:
     QGtkStylePrivate* stylePrivate;
-    bool eventFilter(QObject *obj, QEvent *e);
+    bool eventFilter(QObject *obj, QEvent *e) Q_DECL_OVERRIDE;
 };
 
 typedef enum {
diff --git a/src/widgets/styles/qproxystyle.h b/src/widgets/styles/qproxystyle.h
index 24779925a5..f2ddf6bda1 100644
--- a/src/widgets/styles/qproxystyle.h
+++ b/src/widgets/styles/qproxystyle.h
@@ -54,40 +54,40 @@ public:
     QStyle *baseStyle() const;
     void setBaseStyle(QStyle *style);
 
-    void drawPrimitive(PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = 0) const;
-    void drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = 0) const;
-    void drawComplexControl(ComplexControl control, const QStyleOptionComplex *option, QPainter *painter, const QWidget *widget = 0) const;
+    void drawPrimitive(PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
+    void drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
+    void drawComplexControl(ComplexControl control, const QStyleOptionComplex *option, QPainter *painter, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     void drawItemText(QPainter *painter, const QRect &rect, int flags, const QPalette &pal, bool enabled,
-                      const QString &text, QPalette::ColorRole textRole = QPalette::NoRole) const;
-    virtual void drawItemPixmap(QPainter *painter, const QRect &rect, int alignment, const QPixmap &pixmap) const;
+                      const QString &text, QPalette::ColorRole textRole = QPalette::NoRole) const Q_DECL_OVERRIDE;
+    virtual void drawItemPixmap(QPainter *painter, const QRect &rect, int alignment, const QPixmap &pixmap) const Q_DECL_OVERRIDE;
 
-    QSize sizeFromContents(ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const;
+    QSize sizeFromContents(ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const Q_DECL_OVERRIDE;
 
-    QRect subElementRect(SubElement element, const QStyleOption *option, const QWidget *widget) const;
-    QRect subControlRect(ComplexControl cc, const QStyleOptionComplex *opt, SubControl sc, const QWidget *widget) const;
-    QRect itemTextRect(const QFontMetrics &fm, const QRect &r, int flags, bool enabled, const QString &text) const;
-    QRect itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const;
+    QRect subElementRect(SubElement element, const QStyleOption *option, const QWidget *widget) const Q_DECL_OVERRIDE;
+    QRect subControlRect(ComplexControl cc, const QStyleOptionComplex *opt, SubControl sc, const QWidget *widget) const Q_DECL_OVERRIDE;
+    QRect itemTextRect(const QFontMetrics &fm, const QRect &r, int flags, bool enabled, const QString &text) const Q_DECL_OVERRIDE;
+    QRect itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const Q_DECL_OVERRIDE;
 
-    SubControl hitTestComplexControl(ComplexControl control, const QStyleOptionComplex *option, const QPoint &pos, const QWidget *widget = 0) const;
-    int styleHint(StyleHint hint, const QStyleOption *option = 0, const QWidget *widget = 0, QStyleHintReturn *returnData = 0) const;
-    int pixelMetric(PixelMetric metric, const QStyleOption *option = 0, const QWidget *widget = 0) const;
+    SubControl hitTestComplexControl(ComplexControl control, const QStyleOptionComplex *option, const QPoint &pos, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
+    int styleHint(StyleHint hint, const QStyleOption *option = 0, const QWidget *widget = 0, QStyleHintReturn *returnData = 0) const Q_DECL_OVERRIDE;
+    int pixelMetric(PixelMetric metric, const QStyleOption *option = 0, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     int layoutSpacing(QSizePolicy::ControlType control1, QSizePolicy::ControlType control2,
-                      Qt::Orientation orientation, const QStyleOption *option = 0, const QWidget *widget = 0) const;
+                      Qt::Orientation orientation, const QStyleOption *option = 0, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
-    QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *option = 0, const QWidget *widget = 0) const;
-    QPixmap standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt, const QWidget *widget = 0) const;
-    QPixmap generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap, const QStyleOption *opt) const;
-    QPalette standardPalette() const;
+    QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *option = 0, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
+    QPixmap standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
+    QPixmap generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap, const QStyleOption *opt) const Q_DECL_OVERRIDE;
+    QPalette standardPalette() const Q_DECL_OVERRIDE;
 
-    void polish(QWidget *widget);
-    void polish(QPalette &pal);
-    void polish(QApplication *app);
+    void polish(QWidget *widget) Q_DECL_OVERRIDE;
+    void polish(QPalette &pal) Q_DECL_OVERRIDE;
+    void polish(QApplication *app) Q_DECL_OVERRIDE;
 
-    void unpolish(QWidget *widget);
-    void unpolish(QApplication *app);
+    void unpolish(QWidget *widget) Q_DECL_OVERRIDE;
+    void unpolish(QApplication *app) Q_DECL_OVERRIDE;
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QProxyStyle)
diff --git a/src/widgets/styles/qstyleanimation_p.h b/src/widgets/styles/qstyleanimation_p.h
index a9f9325826..7bfdb34e5e 100644
--- a/src/widgets/styles/qstyleanimation_p.h
+++ b/src/widgets/styles/qstyleanimation_p.h
@@ -63,7 +63,7 @@ public:
 
     QObject *target() const;
 
-    int duration() const;
+    int duration() const Q_DECL_OVERRIDE;
     void setDuration(int duration);
 
     int delay() const;
@@ -89,7 +89,7 @@ public Q_SLOTS:
 
 protected:
     virtual bool isUpdateNeeded() const;
-    virtual void updateCurrentTime(int time);
+    virtual void updateCurrentTime(int time) Q_DECL_OVERRIDE;
 
 private:
     int _delay;
@@ -113,7 +113,7 @@ public:
     void setSpeed(int speed);
 
 protected:
-    bool isUpdateNeeded() const;
+    bool isUpdateNeeded() const Q_DECL_OVERRIDE;
 
 private:
     int _speed;
@@ -136,7 +136,7 @@ public:
     qreal currentValue() const;
 
 protected:
-    bool isUpdateNeeded() const;
+    bool isUpdateNeeded() const Q_DECL_OVERRIDE;
 
 private:
     qreal _start;
@@ -162,7 +162,7 @@ public:
     QImage currentImage() const;
 
 protected:
-    virtual void updateCurrentTime(int time);
+    virtual void updateCurrentTime(int time) Q_DECL_OVERRIDE;
 
 private:
     Type _type;
@@ -186,7 +186,7 @@ public:
     void setActive(bool active);
 
 private slots:
-    void updateCurrentTime(int time);
+    void updateCurrentTime(int time) Q_DECL_OVERRIDE;
 
 private:
     Mode _mode;
diff --git a/src/widgets/styles/qstylesheetstyle.cpp b/src/widgets/styles/qstylesheetstyle.cpp
index e9f20de842..21464ef090 100644
--- a/src/widgets/styles/qstylesheetstyle.cpp
+++ b/src/widgets/styles/qstylesheetstyle.cpp
@@ -1413,7 +1413,7 @@ class QStyleSheetStyleSelector : public StyleSelector
 public:
     QStyleSheetStyleSelector() { }
 
-    QStringList nodeNames(NodePtr node) const
+    QStringList nodeNames(NodePtr node) const Q_DECL_OVERRIDE
     {
         if (isNullNode(node))
             return QStringList();
@@ -1429,7 +1429,7 @@ public:
         } while (metaObject != 0);
         return result;
     }
-    QString attribute(NodePtr node, const QString& name) const
+    QString attribute(NodePtr node, const QString& name) const Q_DECL_OVERRIDE
     {
         if (isNullNode(node))
             return QString();
@@ -1466,7 +1466,7 @@ public:
         cache[name] = valueStr;
         return valueStr;
     }
-    bool nodeNameEquals(NodePtr node, const QString& nodeName) const
+    bool nodeNameEquals(NodePtr node, const QString& nodeName) const Q_DECL_OVERRIDE
     {
         if (isNullNode(node))
             return false;
@@ -1489,19 +1489,19 @@ public:
         } while (metaObject != 0);
         return false;
     }
-    bool hasAttributes(NodePtr) const
+    bool hasAttributes(NodePtr) const Q_DECL_OVERRIDE
     { return true; }
-    QStringList nodeIds(NodePtr node) const
+    QStringList nodeIds(NodePtr node) const Q_DECL_OVERRIDE
     { return isNullNode(node) ? QStringList() : QStringList(OBJECT_PTR(node)->objectName()); }
-    bool isNullNode(NodePtr node) const
+    bool isNullNode(NodePtr node) const Q_DECL_OVERRIDE
     { return node.ptr == 0; }
-    NodePtr parentNode(NodePtr node) const
+    NodePtr parentNode(NodePtr node) const Q_DECL_OVERRIDE
     { NodePtr n; n.ptr = isNullNode(node) ? 0 : parentObject(OBJECT_PTR(node)); return n; }
-    NodePtr previousSiblingNode(NodePtr) const
+    NodePtr previousSiblingNode(NodePtr) const Q_DECL_OVERRIDE
     { NodePtr n; n.ptr = 0; return n; }
-    NodePtr duplicateNode(NodePtr node) const
+    NodePtr duplicateNode(NodePtr node) const Q_DECL_OVERRIDE
     { return node; }
-    void freeNode(NodePtr) const
+    void freeNode(NodePtr) const Q_DECL_OVERRIDE
     { }
 
 private:
diff --git a/src/widgets/styles/qstylesheetstyle_p.h b/src/widgets/styles/qstylesheetstyle_p.h
index c4e81787b5..212be5f530 100644
--- a/src/widgets/styles/qstylesheetstyle_p.h
+++ b/src/widgets/styles/qstylesheetstyle_p.h
@@ -74,48 +74,48 @@ public:
     ~QStyleSheetStyle();
 
     void drawComplexControl(ComplexControl cc, const QStyleOptionComplex *opt, QPainter *p,
-                            const QWidget *w = 0) const;
+                            const QWidget *w = 0) const Q_DECL_OVERRIDE;
     void drawControl(ControlElement element, const QStyleOption *opt, QPainter *p,
-                     const QWidget *w = 0) const;
-    void drawItemPixmap(QPainter *painter, const QRect &rect, int alignment, const QPixmap &pixmap) const;
+                     const QWidget *w = 0) const Q_DECL_OVERRIDE;
+    void drawItemPixmap(QPainter *painter, const QRect &rect, int alignment, const QPixmap &pixmap) const Q_DECL_OVERRIDE;
     void drawItemText(QPainter *painter, const QRect& rect, int alignment, const QPalette &pal,
-              bool enabled, const QString& text, QPalette::ColorRole textRole  = QPalette::NoRole) const;
+              bool enabled, const QString& text, QPalette::ColorRole textRole  = QPalette::NoRole) const Q_DECL_OVERRIDE;
     void drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, QPainter *p,
-                       const QWidget *w = 0) const;
+                       const QWidget *w = 0) const Q_DECL_OVERRIDE;
     QPixmap generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap,
-                                const QStyleOption *option) const;
+                                const QStyleOption *option) const Q_DECL_OVERRIDE;
     SubControl hitTestComplexControl(ComplexControl cc, const QStyleOptionComplex *opt,
-                                     const QPoint &pt, const QWidget *w = 0) const;
-    QRect itemPixmapRect(const QRect &rect, int alignment, const QPixmap &pixmap) const;
+                                     const QPoint &pt, const QWidget *w = 0) const Q_DECL_OVERRIDE;
+    QRect itemPixmapRect(const QRect &rect, int alignment, const QPixmap &pixmap) const Q_DECL_OVERRIDE;
     QRect itemTextRect(const QFontMetrics &metrics, const QRect &rect, int alignment, bool enabled,
-                       const QString &text) const;
-    int pixelMetric(PixelMetric metric, const QStyleOption *option = 0, const QWidget *widget = 0) const;
-    void polish(QWidget *widget);
-    void polish(QApplication *app);
-    void polish(QPalette &pal);
+                       const QString &text) const Q_DECL_OVERRIDE;
+    int pixelMetric(PixelMetric metric, const QStyleOption *option = 0, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
+    void polish(QWidget *widget) Q_DECL_OVERRIDE;
+    void polish(QApplication *app) Q_DECL_OVERRIDE;
+    void polish(QPalette &pal) Q_DECL_OVERRIDE;
     QSize sizeFromContents(ContentsType ct, const QStyleOption *opt,
-                           const QSize &contentsSize, const QWidget *widget = 0) const;
-    QPalette standardPalette() const;
+                           const QSize &contentsSize, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
+    QPalette standardPalette() const Q_DECL_OVERRIDE;
     QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *opt = 0,
-                       const QWidget *widget = 0) const;
+                       const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     QPixmap standardPixmap(StandardPixmap standardPixmap, const QStyleOption *option = 0,
-                           const QWidget *w = 0 ) const;
+                           const QWidget *w = 0 ) const Q_DECL_OVERRIDE;
     int layoutSpacing(QSizePolicy::ControlType control1, QSizePolicy::ControlType control2,
                           Qt::Orientation orientation, const QStyleOption *option = 0,
-                          const QWidget *widget = 0) const;
+                          const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     int styleHint(StyleHint sh, const QStyleOption *opt = 0, const QWidget *w = 0,
-                  QStyleHintReturn *shret = 0) const;
-    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const;
+                  QStyleHintReturn *shret = 0) const Q_DECL_OVERRIDE;
+    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     QRect subControlRect(ComplexControl cc, const QStyleOptionComplex *opt, SubControl sc,
-                         const QWidget *w = 0) const;
+                         const QWidget *w = 0) const Q_DECL_OVERRIDE;
 
     // These functions are called from QApplication/QWidget. Be careful.
     QStyle *baseStyle() const;
     void repolish(QWidget *widget);
     void repolish(QApplication *app);
 
-    void unpolish(QWidget *widget);
-    void unpolish(QApplication *app);
+    void unpolish(QWidget *widget) Q_DECL_OVERRIDE;
+    void unpolish(QApplication *app) Q_DECL_OVERRIDE;
 
     QStyle *base;
     void ref() { ++refcount; }
@@ -128,7 +128,7 @@ public:
     bool styleSheetPalette(const QWidget* w, const QStyleOption* opt, QPalette* pal);
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 
 private:
     int refcount;
diff --git a/src/widgets/styles/qwindowsstyle_p.h b/src/widgets/styles/qwindowsstyle_p.h
index b3c6f831d8..9b3efc6f1f 100644
--- a/src/widgets/styles/qwindowsstyle_p.h
+++ b/src/widgets/styles/qwindowsstyle_p.h
@@ -61,37 +61,37 @@ public:
     QWindowsStyle();
     ~QWindowsStyle();
 
-    void polish(QApplication*);
-    void unpolish(QApplication*);
+    void polish(QApplication*) Q_DECL_OVERRIDE;
+    void unpolish(QApplication*) Q_DECL_OVERRIDE;
 
-    void polish(QWidget*);
-    void unpolish(QWidget*);
+    void polish(QWidget*) Q_DECL_OVERRIDE;
+    void unpolish(QWidget*) Q_DECL_OVERRIDE;
 
-    void polish(QPalette &);
+    void polish(QPalette &) Q_DECL_OVERRIDE;
 
     void drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, QPainter *p,
-                       const QWidget *w = 0) const;
+                       const QWidget *w = 0) const Q_DECL_OVERRIDE;
     void drawControl(ControlElement element, const QStyleOption *opt, QPainter *p,
-                     const QWidget *w = 0) const;
-    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const;
+                     const QWidget *w = 0) const Q_DECL_OVERRIDE;
+    QRect subElementRect(SubElement r, const QStyleOption *opt, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
     void drawComplexControl(ComplexControl cc, const QStyleOptionComplex *opt, QPainter *p,
-                            const QWidget *w = 0) const;
+                            const QWidget *w = 0) const Q_DECL_OVERRIDE;
     QSize sizeFromContents(ContentsType ct, const QStyleOption *opt,
-                           const QSize &contentsSize, const QWidget *widget = 0) const;
+                           const QSize &contentsSize, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
-    int pixelMetric(PixelMetric pm, const QStyleOption *option = 0, const QWidget *widget = 0) const;
+    int pixelMetric(PixelMetric pm, const QStyleOption *option = 0, const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
     int styleHint(StyleHint hint, const QStyleOption *opt = 0, const QWidget *widget = 0,
-                  QStyleHintReturn *returnData = 0) const;
+                  QStyleHintReturn *returnData = 0) const Q_DECL_OVERRIDE;
 
     QPixmap standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt,
-                           const QWidget *widget = 0) const;
+                           const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
     QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *option = 0,
-                       const QWidget *widget = 0) const;
+                       const QWidget *widget = 0) const Q_DECL_OVERRIDE;
 
 protected:
-    bool eventFilter(QObject *o, QEvent *e);
+    bool eventFilter(QObject *o, QEvent *e) Q_DECL_OVERRIDE;
     QWindowsStyle(QWindowsStylePrivate &dd);
 
 private:
diff --git a/src/widgets/util/qcompleter.h b/src/widgets/util/qcompleter.h
index 3bee280719..c252284b85 100644
--- a/src/widgets/util/qcompleter.h
+++ b/src/widgets/util/qcompleter.h
@@ -136,8 +136,8 @@ public:
     virtual QStringList splitPath(const QString &path) const;
 
 protected:
-    bool eventFilter(QObject *o, QEvent *e);
-    bool event(QEvent *);
+    bool eventFilter(QObject *o, QEvent *e) Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
 
 Q_SIGNALS:
     void activated(const QString &text);
diff --git a/src/widgets/util/qcompleter_p.h b/src/widgets/util/qcompleter_p.h
index 50f7cdacdb..b4ead17cab 100644
--- a/src/widgets/util/qcompleter_p.h
+++ b/src/widgets/util/qcompleter_p.h
@@ -167,7 +167,7 @@ class QSortedModelEngine : public QCompletionEngine
 {
 public:
     QSortedModelEngine(QCompleterPrivate *c) : QCompletionEngine(c) { }
-    QMatchData filter(const QString&, const QModelIndex&, int);
+    QMatchData filter(const QString&, const QModelIndex&, int) Q_DECL_OVERRIDE;
     QIndexMapper indexHint(QString, const QModelIndex&, Qt::SortOrder);
     Qt::SortOrder sortOrder(const QModelIndex&) const;
 };
@@ -177,8 +177,8 @@ class QUnsortedModelEngine : public QCompletionEngine
 public:
     QUnsortedModelEngine(QCompleterPrivate *c) : QCompletionEngine(c) { }
 
-    void filterOnDemand(int);
-    QMatchData filter(const QString&, const QModelIndex&, int);
+    void filterOnDemand(int) Q_DECL_OVERRIDE;
+    QMatchData filter(const QString&, const QModelIndex&, int) Q_DECL_OVERRIDE;
 private:
     int buildIndices(const QString& str, const QModelIndex& parent, int n,
                      const QIndexMapper& iv, QMatchData* m);
@@ -189,7 +189,7 @@ class QCompleterItemDelegate : public QItemDelegate
 public:
     QCompleterItemDelegate(QAbstractItemView *view)
         : QItemDelegate(view), view(view) { }
-    void paint(QPainter *p, const QStyleOptionViewItem& opt, const QModelIndex& idx) const {
+    void paint(QPainter *p, const QStyleOptionViewItem& opt, const QModelIndex& idx) const Q_DECL_OVERRIDE {
         QStyleOptionViewItem optCopy = opt;
         optCopy.showDecorationSelected = true;
         if (view->currentIndex() == idx)
@@ -218,16 +218,16 @@ public:
     bool setCurrentRow(int row);
     QModelIndex currentIndex(bool) const;
 
-    QModelIndex index(int row, int column, const QModelIndex & = QModelIndex()) const;
-    int rowCount(const QModelIndex &index = QModelIndex()) const;
-    int columnCount(const QModelIndex &index = QModelIndex()) const;
-    bool hasChildren(const QModelIndex &parent = QModelIndex()) const;
-    QModelIndex parent(const QModelIndex & = QModelIndex()) const { return QModelIndex(); }
-    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const;
+    QModelIndex index(int row, int column, const QModelIndex & = QModelIndex()) const Q_DECL_OVERRIDE;
+    int rowCount(const QModelIndex &index = QModelIndex()) const Q_DECL_OVERRIDE;
+    int columnCount(const QModelIndex &index = QModelIndex()) const Q_DECL_OVERRIDE;
+    bool hasChildren(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    QModelIndex parent(const QModelIndex & = QModelIndex()) const Q_DECL_OVERRIDE { return QModelIndex(); }
+    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
 
-    void setSourceModel(QAbstractItemModel *sourceModel);
-    QModelIndex mapToSource(const QModelIndex& proxyIndex) const;
-    QModelIndex mapFromSource(const QModelIndex& sourceIndex) const;
+    void setSourceModel(QAbstractItemModel *sourceModel) Q_DECL_OVERRIDE;
+    QModelIndex mapToSource(const QModelIndex& proxyIndex) const Q_DECL_OVERRIDE;
+    QModelIndex mapFromSource(const QModelIndex& sourceIndex) const Q_DECL_OVERRIDE;
 
     QCompleterPrivate *c;
     QScopedPointer<QCompletionEngine> engine;
diff --git a/src/widgets/util/qflickgesture.cpp b/src/widgets/util/qflickgesture.cpp
index a5f2cf2e66..8c87d9b269 100644
--- a/src/widgets/util/qflickgesture.cpp
+++ b/src/widgets/util/qflickgesture.cpp
@@ -240,7 +240,7 @@ public:
     }
 
 protected:
-    void timerEvent(QTimerEvent *e)
+    void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE
     {
         if (e->timerId() == pressDelayTimer) {
             if (pressDelayEvent && mouseTarget) {
diff --git a/src/widgets/util/qscroller.cpp b/src/widgets/util/qscroller.cpp
index 8cd7b97e30..5235511b6d 100644
--- a/src/widgets/util/qscroller.cpp
+++ b/src/widgets/util/qscroller.cpp
@@ -190,7 +190,7 @@ public:
         : d(_d), ignoreUpdate(false), skip(0)
     { }
 
-    int duration() const
+    int duration() const Q_DECL_OVERRIDE
     {
         return -1;
     }
@@ -206,7 +206,7 @@ public:
     }
 
 protected:
-    void updateCurrentTime(int /*currentTime*/)
+    void updateCurrentTime(int /*currentTime*/) Q_DECL_OVERRIDE
    {
         if (!ignoreUpdate) {
             if (++skip >= d->frameRateSkip()) {
diff --git a/src/widgets/util/qsystemtrayicon.h b/src/widgets/util/qsystemtrayicon.h
index 4d92d811ed..29a9f849b4 100644
--- a/src/widgets/util/qsystemtrayicon.h
+++ b/src/widgets/util/qsystemtrayicon.h
@@ -102,7 +102,7 @@ Q_SIGNALS:
     void messageClicked();
 
 protected:
-    bool event(QEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QSystemTrayIcon)
diff --git a/src/widgets/util/qsystemtrayicon_p.h b/src/widgets/util/qsystemtrayicon_p.h
index 0dda689c51..ce88313707 100644
--- a/src/widgets/util/qsystemtrayicon_p.h
+++ b/src/widgets/util/qsystemtrayicon_p.h
@@ -119,10 +119,10 @@ private:
     void balloon(const QPoint&, int, bool);
 
 protected:
-    void paintEvent(QPaintEvent *);
-    void resizeEvent(QResizeEvent *);
-    void mousePressEvent(QMouseEvent *e);
-    void timerEvent(QTimerEvent *e);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
 
 private:
     QSystemTrayIcon *trayIcon;
diff --git a/src/widgets/util/qsystemtrayicon_x11.cpp b/src/widgets/util/qsystemtrayicon_x11.cpp
index 09f2d6266c..8fbbc96f6c 100644
--- a/src/widgets/util/qsystemtrayicon_x11.cpp
+++ b/src/widgets/util/qsystemtrayicon_x11.cpp
@@ -74,12 +74,12 @@ public:
     QRect globalGeometry() const;
 
 protected:
-    virtual void mousePressEvent(QMouseEvent *ev);
-    virtual void mouseDoubleClickEvent(QMouseEvent *ev);
-    virtual bool event(QEvent *);
-    virtual void paintEvent(QPaintEvent *);
-    virtual void resizeEvent(QResizeEvent *);
-    virtual void moveEvent(QMoveEvent *);
+    virtual void mousePressEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    virtual void mouseDoubleClickEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    virtual bool event(QEvent *) Q_DECL_OVERRIDE;
+    virtual void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    virtual void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    virtual void moveEvent(QMoveEvent *) Q_DECL_OVERRIDE;
 
 private slots:
     void systemTrayWindowChanged(QScreen *screen);
diff --git a/src/widgets/util/qundoview.cpp b/src/widgets/util/qundoview.cpp
index 970541cf73..4ead2910a2 100644
--- a/src/widgets/util/qundoview.cpp
+++ b/src/widgets/util/qundoview.cpp
@@ -53,11 +53,11 @@ public:
     QUndoStack *stack() const;
 
     virtual QModelIndex index(int row, int column,
-                const QModelIndex &parent = QModelIndex()) const;
-    virtual QModelIndex parent(const QModelIndex &child) const;
-    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;
-    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+                const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    virtual QModelIndex parent(const QModelIndex &child) const Q_DECL_OVERRIDE;
+    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
+    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
 
     QModelIndex selectedIndex() const;
     QItemSelectionModel *selectionModel() const;
diff --git a/src/widgets/widgets/qabstractbutton.h b/src/widgets/widgets/qabstractbutton.h
index 7fa50f4c0b..c80e2e9d5d 100644
--- a/src/widgets/widgets/qabstractbutton.h
+++ b/src/widgets/widgets/qabstractbutton.h
@@ -122,16 +122,16 @@ protected:
     virtual void checkStateSet();
     virtual void nextCheckState();
 
-    bool event(QEvent *e);
-    void keyPressEvent(QKeyEvent *e);
-    void keyReleaseEvent(QKeyEvent *e);
-    void mousePressEvent(QMouseEvent *e);
-    void mouseReleaseEvent(QMouseEvent *e);
-    void mouseMoveEvent(QMouseEvent *e);
-    void focusInEvent(QFocusEvent *e);
-    void focusOutEvent(QFocusEvent *e);
-    void changeEvent(QEvent *e);
-    void timerEvent(QTimerEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
+    void keyReleaseEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
 
 
 protected:
diff --git a/src/widgets/widgets/qabstractscrollarea.h b/src/widgets/widgets/qabstractscrollarea.h
index a3f6c3e2d4..bd15ba8a52 100644
--- a/src/widgets/widgets/qabstractscrollarea.h
+++ b/src/widgets/widgets/qabstractscrollarea.h
@@ -84,9 +84,9 @@ public:
     void setViewport(QWidget *widget);
     QSize maximumViewportSize() const;
 
-    QSize minimumSizeHint() const;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     virtual void setupViewport(QWidget *viewport);
 
@@ -98,30 +98,30 @@ protected:
     void setViewportMargins(int left, int top, int right, int bottom);
     void setViewportMargins(const QMargins &margins);
 
-    bool eventFilter(QObject *, QEvent *);
-    bool event(QEvent *);
+    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
     virtual bool viewportEvent(QEvent *);
 
-    void resizeEvent(QResizeEvent *);
-    void paintEvent(QPaintEvent *);
-    void mousePressEvent(QMouseEvent *);
-    void mouseReleaseEvent(QMouseEvent *);
-    void mouseDoubleClickEvent(QMouseEvent *);
-    void mouseMoveEvent(QMouseEvent *);
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *);
+    void wheelEvent(QWheelEvent *) Q_DECL_OVERRIDE;
 #endif
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QContextMenuEvent *);
+    void contextMenuEvent(QContextMenuEvent *) Q_DECL_OVERRIDE;
 #endif
 #ifndef QT_NO_DRAGANDDROP
-    void dragEnterEvent(QDragEnterEvent *);
-    void dragMoveEvent(QDragMoveEvent *);
-    void dragLeaveEvent(QDragLeaveEvent *);
-    void dropEvent(QDropEvent *);
+    void dragEnterEvent(QDragEnterEvent *) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QDragMoveEvent *) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *) Q_DECL_OVERRIDE;
 #endif
 
-    void keyPressEvent(QKeyEvent *);
+    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;
 
     virtual void scrollContentsBy(int dx, int dy);
 
diff --git a/src/widgets/widgets/qabstractscrollarea_p.h b/src/widgets/widgets/qabstractscrollarea_p.h
index aaf93a3352..a70b4df5eb 100644
--- a/src/widgets/widgets/qabstractscrollarea_p.h
+++ b/src/widgets/widgets/qabstractscrollarea_p.h
@@ -114,7 +114,7 @@ class QAbstractScrollAreaFilter : public QObject
 public:
     QAbstractScrollAreaFilter(QAbstractScrollAreaPrivate *p) : d(p)
     { setObjectName(QLatin1String("qt_abstractscrollarea_filter")); }
-    bool eventFilter(QObject *o, QEvent *e)
+    bool eventFilter(QObject *o, QEvent *e) Q_DECL_OVERRIDE
     { return (o == d->viewport ? d->viewportEvent(e) : false); }
 private:
     QAbstractScrollAreaPrivate *d;
diff --git a/src/widgets/widgets/qabstractslider.h b/src/widgets/widgets/qabstractslider.h
index 99312a0ef7..3b107d5502 100644
--- a/src/widgets/widgets/qabstractslider.h
+++ b/src/widgets/widgets/qabstractslider.h
@@ -122,7 +122,7 @@ Q_SIGNALS:
     void actionTriggered(int action);
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 
     void setRepeatAction(SliderAction action, int thresholdTime = 500, int repeatTime = 50);
     SliderAction repeatAction() const;
@@ -135,12 +135,12 @@ protected:
     };
     virtual void sliderChange(SliderChange change);
 
-    void keyPressEvent(QKeyEvent *ev);
-    void timerEvent(QTimerEvent *);
+    void keyPressEvent(QKeyEvent *ev) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *e);
+    void wheelEvent(QWheelEvent *e) Q_DECL_OVERRIDE;
 #endif
-    void changeEvent(QEvent *e);
+    void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
 
 
 protected:
diff --git a/src/widgets/widgets/qcalendarwidget.cpp b/src/widgets/widgets/qcalendarwidget.cpp
index fa3dbc1f32..0071143958 100644
--- a/src/widgets/widgets/qcalendarwidget.cpp
+++ b/src/widgets/widgets/qcalendarwidget.cpp
@@ -104,11 +104,11 @@ class QCalendarDayValidator : public QCalendarDateSectionValidator
 
 public:
     QCalendarDayValidator();
-    virtual Section handleKey(int key);
-    virtual QDate applyToDate(const QDate &date) const;
-    virtual void setDate(const QDate &date);
-    virtual QString text() const;
-    virtual QString text(const QDate &date, int repeat) const;
+    virtual Section handleKey(int key) Q_DECL_OVERRIDE;
+    virtual QDate applyToDate(const QDate &date) const Q_DECL_OVERRIDE;
+    virtual void setDate(const QDate &date) Q_DECL_OVERRIDE;
+    virtual QString text() const Q_DECL_OVERRIDE;
+    virtual QString text(const QDate &date, int repeat) const Q_DECL_OVERRIDE;
 private:
     int m_pos;
     int m_day;
@@ -220,11 +220,11 @@ class QCalendarMonthValidator : public QCalendarDateSectionValidator
 
 public:
     QCalendarMonthValidator();
-    virtual Section handleKey(int key);
-    virtual QDate applyToDate(const QDate &date) const;
-    virtual void setDate(const QDate &date);
-    virtual QString text() const;
-    virtual QString text(const QDate &date, int repeat) const;
+    virtual Section handleKey(int key) Q_DECL_OVERRIDE;
+    virtual QDate applyToDate(const QDate &date) const Q_DECL_OVERRIDE;
+    virtual void setDate(const QDate &date) Q_DECL_OVERRIDE;
+    virtual QString text() const Q_DECL_OVERRIDE;
+    virtual QString text(const QDate &date, int repeat) const Q_DECL_OVERRIDE;
 private:
     int m_pos;
     int m_month;
@@ -337,11 +337,11 @@ class QCalendarYearValidator : public QCalendarDateSectionValidator
 
 public:
     QCalendarYearValidator();
-    virtual Section handleKey(int key);
-    virtual QDate applyToDate(const QDate &date) const;
-    virtual void setDate(const QDate &date);
-    virtual QString text() const;
-    virtual QString text(const QDate &date, int repeat) const;
+    virtual Section handleKey(int key) Q_DECL_OVERRIDE;
+    virtual QDate applyToDate(const QDate &date) const Q_DECL_OVERRIDE;
+    virtual void setDate(const QDate &date) Q_DECL_OVERRIDE;
+    virtual QString text() const Q_DECL_OVERRIDE;
+    virtual QString text(const QDate &date, int repeat) const Q_DECL_OVERRIDE;
 private:
     int pow10(int n);
     int m_pos;
@@ -683,8 +683,8 @@ public:
     QDate date() const;
     void setDate(const QDate &date);
 
-    bool eventFilter(QObject *o, QEvent *e);
-    void timerEvent(QTimerEvent *e);
+    bool eventFilter(QObject *o, QEvent *e) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
 
 signals:
     void dateChanged(const QDate &date);
@@ -853,32 +853,32 @@ class QCalendarModel : public QAbstractTableModel
 public:
     QCalendarModel(QObject *parent = 0);
 
-    int rowCount(const QModelIndex &) const
+    int rowCount(const QModelIndex &) const Q_DECL_OVERRIDE
         { return RowCount + m_firstRow; }
-    int columnCount(const QModelIndex &) const
+    int columnCount(const QModelIndex &) const Q_DECL_OVERRIDE
         { return ColumnCount + m_firstColumn; }
-    QVariant data(const QModelIndex &index, int role) const;
-    Qt::ItemFlags flags(const QModelIndex &index) const;
+    QVariant data(const QModelIndex &index, int role) const Q_DECL_OVERRIDE;
+    Qt::ItemFlags flags(const QModelIndex &index) const Q_DECL_OVERRIDE;
 
-    bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex())
+    bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex()) Q_DECL_OVERRIDE
     {
         beginInsertRows(parent, row, row + count - 1);
         endInsertRows();
         return true;
     }
-    bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex())
+    bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex()) Q_DECL_OVERRIDE
     {
         beginInsertColumns(parent, column, column + count - 1);
         endInsertColumns();
         return true;
     }
-    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex())
+    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex()) Q_DECL_OVERRIDE
     {
         beginRemoveRows(parent, row, row + count - 1);
         endRemoveRows();
         return true;
     }
-    bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex())
+    bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex()) Q_DECL_OVERRIDE
     {
         beginRemoveColumns(parent, column, column + count - 1);
         endRemoveColumns();
@@ -939,7 +939,7 @@ public:
 
     void internalUpdate() { updateGeometries(); }
     void setReadOnly(bool enable);
-    virtual void keyboardSearch(const QString & search) { Q_UNUSED(search) }
+    virtual void keyboardSearch(const QString & search) Q_DECL_OVERRIDE { Q_UNUSED(search) }
 
 signals:
     void showDate(const QDate &date);
@@ -947,16 +947,16 @@ signals:
     void clicked(const QDate &date);
     void editingFinished();
 protected:
-    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
-    void mouseDoubleClickEvent(QMouseEvent *event);
-    void mousePressEvent(QMouseEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
+    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *event);
+    void wheelEvent(QWheelEvent *event) Q_DECL_OVERRIDE;
 #endif
-    void keyPressEvent(QKeyEvent *event);
-    bool event(QEvent *event);
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
     QDate handleMouseEvent(QMouseEvent *event);
 public:
@@ -1555,7 +1555,7 @@ public:
         : QItemDelegate(parent), calendarWidgetPrivate(w)
             { }
     virtual void paint(QPainter *painter, const QStyleOptionViewItem &option,
-                const QModelIndex &index) const;
+                const QModelIndex &index) const Q_DECL_OVERRIDE;
     void paintCell(QPainter *painter, const QRect &rect, const QDate &date) const;
 
 private:
@@ -1571,7 +1571,7 @@ public:
         : QToolButton(parent)
           {  }
 protected:
-    void paintEvent(QPaintEvent *e)
+    void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE
     {
         Q_UNUSED(e)
 
@@ -1599,7 +1599,7 @@ class QPrevNextCalButton : public QToolButton
 public:
     QPrevNextCalButton(QWidget *parent) : QToolButton(parent) {}
 protected:
-    void paintEvent(QPaintEvent *) {
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE {
         QStylePainter painter(this);
         QStyleOptionToolButton opt;
         initStyleOption(&opt);
diff --git a/src/widgets/widgets/qcalendarwidget.h b/src/widgets/widgets/qcalendarwidget.h
index e838098e53..f039fdf6c9 100644
--- a/src/widgets/widgets/qcalendarwidget.h
+++ b/src/widgets/widgets/qcalendarwidget.h
@@ -86,8 +86,8 @@ public:
     explicit QCalendarWidget(QWidget *parent = 0);
     ~QCalendarWidget();
 
-    virtual QSize sizeHint() const;
-    virtual QSize minimumSizeHint() const;
+    virtual QSize sizeHint() const Q_DECL_OVERRIDE;
+    virtual QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     QDate selectedDate() const;
 
@@ -132,11 +132,11 @@ public:
     void setDateEditAcceptDelay(int delay);
 
 protected:
-    bool event(QEvent *event);
-    bool eventFilter(QObject *watched, QEvent *event);
-    void mousePressEvent(QMouseEvent *event);
-    void resizeEvent(QResizeEvent * event);
-    void keyPressEvent(QKeyEvent * event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    bool eventFilter(QObject *watched, QEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent * event) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent * event) Q_DECL_OVERRIDE;
 
     virtual void paintCell(QPainter *painter, const QRect &rect, const QDate &date) const;
     void updateCell(const QDate &date);
diff --git a/src/widgets/widgets/qcheckbox.h b/src/widgets/widgets/qcheckbox.h
index fe954571aa..6586793db2 100644
--- a/src/widgets/widgets/qcheckbox.h
+++ b/src/widgets/widgets/qcheckbox.h
@@ -53,8 +53,8 @@ public:
     explicit QCheckBox(const QString &text, QWidget *parent=0);
     ~QCheckBox();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     void setTristate(bool y = true);
     bool isTristate() const;
@@ -66,12 +66,12 @@ Q_SIGNALS:
     void stateChanged(int);
 
 protected:
-    bool event(QEvent *e);
-    bool hitButton(const QPoint &pos) const;
-    void checkStateSet();
-    void nextCheckState();
-    void paintEvent(QPaintEvent *);
-    void mouseMoveEvent(QMouseEvent *);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    bool hitButton(const QPoint &pos) const Q_DECL_OVERRIDE;
+    void checkStateSet() Q_DECL_OVERRIDE;
+    void nextCheckState() Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionButton *option) const;
 
 
diff --git a/src/widgets/widgets/qcombobox.h b/src/widgets/widgets/qcombobox.h
index 806653d2d8..7e399ec1f5 100644
--- a/src/widgets/widgets/qcombobox.h
+++ b/src/widgets/widgets/qcombobox.h
@@ -188,14 +188,14 @@ public:
     QAbstractItemView *view() const;
     void setView(QAbstractItemView *itemView);
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     virtual void showPopup();
     virtual void hidePopup();
 
-    bool event(QEvent *event);
-    QVariant inputMethodQuery(Qt::InputMethodQuery) const;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    QVariant inputMethodQuery(Qt::InputMethodQuery) const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void clear();
@@ -215,22 +215,22 @@ Q_SIGNALS:
     void currentTextChanged(const QString &);
 
 protected:
-    void focusInEvent(QFocusEvent *e);
-    void focusOutEvent(QFocusEvent *e);
-    void changeEvent(QEvent *e);
-    void resizeEvent(QResizeEvent *e);
-    void paintEvent(QPaintEvent *e);
-    void showEvent(QShowEvent *e);
-    void hideEvent(QHideEvent *e);
-    void mousePressEvent(QMouseEvent *e);
-    void mouseReleaseEvent(QMouseEvent *e);
-    void keyPressEvent(QKeyEvent *e);
-    void keyReleaseEvent(QKeyEvent *e);
+    void focusInEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *e) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent *e) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
+    void keyReleaseEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *e);
+    void wheelEvent(QWheelEvent *e) Q_DECL_OVERRIDE;
 #endif
-    void contextMenuEvent(QContextMenuEvent *e);
-    void inputMethodEvent(QInputMethodEvent *);
+    void contextMenuEvent(QContextMenuEvent *e) Q_DECL_OVERRIDE;
+    void inputMethodEvent(QInputMethodEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionComboBox *option) const;
 
 
diff --git a/src/widgets/widgets/qcommandlinkbutton.h b/src/widgets/widgets/qcommandlinkbutton.h
index bfef2e300d..582f666e83 100644
--- a/src/widgets/widgets/qcommandlinkbutton.h
+++ b/src/widgets/widgets/qcommandlinkbutton.h
@@ -58,11 +58,11 @@ public:
     void setDescription(const QString &description);
 
 protected:
-    QSize sizeHint() const;
-    int heightForWidth(int) const;
-    QSize minimumSizeHint() const;
-    bool event(QEvent *e);
-    void paintEvent(QPaintEvent *);
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    int heightForWidth(int) const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QCommandLinkButton)
diff --git a/src/widgets/widgets/qdial.cpp b/src/widgets/widgets/qdial.cpp
index 0dd6515f5b..a9de9a7154 100644
--- a/src/widgets/widgets/qdial.cpp
+++ b/src/widgets/widgets/qdial.cpp
@@ -75,7 +75,7 @@ public:
     int valueFromPoint(const QPoint &) const;
     double angle(const QPoint &, const QPoint &) const;
     void init();
-    virtual int bound(int val) const;
+    virtual int bound(int val) const Q_DECL_OVERRIDE;
 };
 
 void QDialPrivate::init()
diff --git a/src/widgets/widgets/qdial.h b/src/widgets/widgets/qdial.h
index de233b09b7..acaf6c8c9e 100644
--- a/src/widgets/widgets/qdial.h
+++ b/src/widgets/widgets/qdial.h
@@ -66,23 +66,23 @@ public:
     qreal notchTarget() const;
     bool notchesVisible() const;
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void setNotchesVisible(bool visible);
     void setWrapping(bool on);
 
 protected:
-    bool event(QEvent *e);
-    void resizeEvent(QResizeEvent *re);
-    void paintEvent(QPaintEvent *pe);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *re) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *pe) Q_DECL_OVERRIDE;
 
-    void mousePressEvent(QMouseEvent *me);
-    void mouseReleaseEvent(QMouseEvent *me);
-    void mouseMoveEvent(QMouseEvent *me);
+    void mousePressEvent(QMouseEvent *me) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *me) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *me) Q_DECL_OVERRIDE;
 
-    void sliderChange(SliderChange change);
+    void sliderChange(SliderChange change) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionSlider *option) const;
 
 
diff --git a/src/widgets/widgets/qdialogbuttonbox.h b/src/widgets/widgets/qdialogbuttonbox.h
index e20a166d29..7bf497e3e5 100644
--- a/src/widgets/widgets/qdialogbuttonbox.h
+++ b/src/widgets/widgets/qdialogbuttonbox.h
@@ -140,8 +140,8 @@ Q_SIGNALS:
     void rejected();
 
 protected:
-    void changeEvent(QEvent *event);
-    bool event(QEvent *event);
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QDialogButtonBox)
diff --git a/src/widgets/widgets/qdockwidget.cpp b/src/widgets/widgets/qdockwidget.cpp
index 4be133e277..6862daf84e 100644
--- a/src/widgets/widgets/qdockwidget.cpp
+++ b/src/widgets/widgets/qdockwidget.cpp
@@ -109,13 +109,13 @@ class QDockWidgetTitleButton : public QAbstractButton
 public:
     QDockWidgetTitleButton(QDockWidget *dockWidget);
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
     inline QSize minimumSizeHint() const
     { return sizeHint(); }
 
-    void enterEvent(QEvent *event);
-    void leaveEvent(QEvent *event);
-    void paintEvent(QPaintEvent *event);
+    void enterEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void leaveEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
 };
 
 
diff --git a/src/widgets/widgets/qdockwidget.h b/src/widgets/widgets/qdockwidget.h
index 70ee2a4dcb..fb5c2c375a 100644
--- a/src/widgets/widgets/qdockwidget.h
+++ b/src/widgets/widgets/qdockwidget.h
@@ -106,10 +106,10 @@ Q_SIGNALS:
     void dockLocationChanged(Qt::DockWidgetArea area);
 
 protected:
-    void changeEvent(QEvent *event);
-    void closeEvent(QCloseEvent *event);
-    void paintEvent(QPaintEvent *event);
-    bool event(QEvent *event);
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionDockWidget *option) const;
 
 private:
diff --git a/src/widgets/widgets/qdockwidget_p.h b/src/widgets/widgets/qdockwidget_p.h
index 7d75b4859c..e8c4720a98 100644
--- a/src/widgets/widgets/qdockwidget_p.h
+++ b/src/widgets/widgets/qdockwidget_p.h
@@ -128,18 +128,18 @@ class Q_WIDGETS_EXPORT QDockWidgetLayout : public QLayout
 public:
     QDockWidgetLayout(QWidget *parent = 0);
     ~QDockWidgetLayout();
-    void addItem(QLayoutItem *item);
-    QLayoutItem *itemAt(int index) const;
-    QLayoutItem *takeAt(int index);
-    int count() const;
+    void addItem(QLayoutItem *item) Q_DECL_OVERRIDE;
+    QLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
+    QLayoutItem *takeAt(int index) Q_DECL_OVERRIDE;
+    int count() const Q_DECL_OVERRIDE;
 
-    QSize maximumSize() const;
-    QSize minimumSize() const;
-    QSize sizeHint() const;
+    QSize maximumSize() const Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     QSize sizeFromContent(const QSize &content, bool floating) const;
 
-    void setGeometry(const QRect &r);
+    void setGeometry(const QRect &r) Q_DECL_OVERRIDE;
 
     enum Role { Content, CloseButton, FloatButton, TitleBar, RoleCount };
     QWidget *widgetForRole(Role r) const;
@@ -170,9 +170,9 @@ class QDockWidgetItem : public QWidgetItem
 {
 public:
     QDockWidgetItem(QDockWidget *dockWidget);
-    QSize minimumSize() const;
-    QSize maximumSize() const;
-    QSize sizeHint() const;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QSize maximumSize() const Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 private:
     inline QLayoutItem *dockWidgetChildItem() const;
diff --git a/src/widgets/widgets/qeffects.cpp b/src/widgets/widgets/qeffects.cpp
index 33fa772d83..79e9c0669a 100644
--- a/src/widgets/widgets/qeffects.cpp
+++ b/src/widgets/widgets/qeffects.cpp
@@ -64,10 +64,10 @@ public:
     void run(int time);
 
 protected:
-    void paintEvent(QPaintEvent* e);
-    void closeEvent(QCloseEvent*);
+    void paintEvent(QPaintEvent* e) Q_DECL_OVERRIDE;
+    void closeEvent(QCloseEvent*) Q_DECL_OVERRIDE;
     void alphaBlend();
-    bool eventFilter(QObject *, QEvent *);
+    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
 
 protected slots:
     void render();
@@ -341,8 +341,8 @@ public:
     void run(int time);
 
 protected:
-    void paintEvent(QPaintEvent*);
-    void closeEvent(QCloseEvent*);
+    void paintEvent(QPaintEvent*) Q_DECL_OVERRIDE;
+    void closeEvent(QCloseEvent*) Q_DECL_OVERRIDE;
 
 private slots:
     void scroll();
diff --git a/src/widgets/widgets/qfocusframe.h b/src/widgets/widgets/qfocusframe.h
index d84f286bb6..08eb2a570d 100644
--- a/src/widgets/widgets/qfocusframe.h
+++ b/src/widgets/widgets/qfocusframe.h
@@ -53,10 +53,10 @@ public:
     QWidget *widget() const;
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 
-    bool eventFilter(QObject *, QEvent *);
-    void paintEvent(QPaintEvent *);
+    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOption *option) const;
 
 private:
diff --git a/src/widgets/widgets/qfontcombobox.cpp b/src/widgets/widgets/qfontcombobox.cpp
index 4e3b57bd02..b040d9ba0d 100644
--- a/src/widgets/widgets/qfontcombobox.cpp
+++ b/src/widgets/widgets/qfontcombobox.cpp
@@ -188,10 +188,10 @@ public:
     // painting
     void paint(QPainter *painter,
                const QStyleOptionViewItem &option,
-               const QModelIndex &index) const;
+               const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     QSize sizeHint(const QStyleOptionViewItem &option,
-                   const QModelIndex &index) const;
+                   const QModelIndex &index) const Q_DECL_OVERRIDE;
 
     QIcon truetype;
     QIcon bitmap;
diff --git a/src/widgets/widgets/qfontcombobox.h b/src/widgets/widgets/qfontcombobox.h
index 95bedc7009..c2e5332c50 100644
--- a/src/widgets/widgets/qfontcombobox.h
+++ b/src/widgets/widgets/qfontcombobox.h
@@ -72,7 +72,7 @@ public:
     FontFilters fontFilters() const;
 
     QFont currentFont() const;
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void setCurrentFont(const QFont &f);
@@ -81,7 +81,7 @@ Q_SIGNALS:
     void currentFontChanged(const QFont &f);
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QFontComboBox)
diff --git a/src/widgets/widgets/qframe.h b/src/widgets/widgets/qframe.h
index 70dd138ad1..90e434722e 100644
--- a/src/widgets/widgets/qframe.h
+++ b/src/widgets/widgets/qframe.h
@@ -63,7 +63,7 @@ public:
 
     int frameWidth() const;
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     enum Shape {
         NoFrame  = 0, // no frame
@@ -100,9 +100,9 @@ public:
     void setFrameRect(const QRect &);
 
 protected:
-    bool event(QEvent *e);
-    void paintEvent(QPaintEvent *);
-    void changeEvent(QEvent *);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
     void drawFrame(QPainter *);
 
 
diff --git a/src/widgets/widgets/qgroupbox.h b/src/widgets/widgets/qgroupbox.h
index ca5a95e79e..da0f4680d6 100644
--- a/src/widgets/widgets/qgroupbox.h
+++ b/src/widgets/widgets/qgroupbox.h
@@ -63,7 +63,7 @@ public:
     Qt::Alignment alignment() const;
     void setAlignment(int alignment);
 
-    QSize minimumSizeHint() const;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     bool isFlat() const;
     void setFlat(bool flat);
@@ -79,15 +79,15 @@ Q_SIGNALS:
     void toggled(bool);
 
 protected:
-    bool event(QEvent *event);
-    void childEvent(QChildEvent *event);
-    void resizeEvent(QResizeEvent *event);
-    void paintEvent(QPaintEvent *event);
-    void focusInEvent(QFocusEvent *event);
-    void changeEvent(QEvent *event);
-    void mousePressEvent(QMouseEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    void childEvent(QChildEvent *event) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionGroupBox *option) const;
 
 
diff --git a/src/widgets/widgets/qlabel.h b/src/widgets/widgets/qlabel.h
index a1e9543187..be56d3bf0f 100644
--- a/src/widgets/widgets/qlabel.h
+++ b/src/widgets/widgets/qlabel.h
@@ -88,13 +88,13 @@ public:
 
     bool hasScaledContents() const;
     void setScaledContents(bool);
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 #ifndef QT_NO_SHORTCUT
     void setBuddy(QWidget *);
     QWidget *buddy() const;
 #endif
-    int heightForWidth(int) const;
+    int heightForWidth(int) const Q_DECL_OVERRIDE;
 
     bool openExternalLinks() const;
     void setOpenExternalLinks(bool open);
@@ -125,17 +125,17 @@ Q_SIGNALS:
     void linkHovered(const QString& link);
 
 protected:
-    bool event(QEvent *e);
-    void keyPressEvent(QKeyEvent *ev);
-    void paintEvent(QPaintEvent *);
-    void changeEvent(QEvent *);
-    void mousePressEvent(QMouseEvent *ev);
-    void mouseMoveEvent(QMouseEvent *ev);
-    void mouseReleaseEvent(QMouseEvent *ev);
-    void contextMenuEvent(QContextMenuEvent *ev);
-    void focusInEvent(QFocusEvent *ev);
-    void focusOutEvent(QFocusEvent *ev);
-    bool focusNextPrevChild(bool next);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *ev) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    void contextMenuEvent(QContextMenuEvent *ev) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *ev) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *ev) Q_DECL_OVERRIDE;
+    bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
 
 
 private:
diff --git a/src/widgets/widgets/qlcdnumber.h b/src/widgets/widgets/qlcdnumber.h
index 0c3a4d6cf5..6acba3f7c1 100644
--- a/src/widgets/widgets/qlcdnumber.h
+++ b/src/widgets/widgets/qlcdnumber.h
@@ -81,7 +81,7 @@ public:
     double value() const;
     int intValue() const;
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void display(const QString &str);
@@ -97,8 +97,8 @@ Q_SIGNALS:
     void overflow();
 
 protected:
-    bool event(QEvent *e);
-    void paintEvent(QPaintEvent *);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 
 public:
 
diff --git a/src/widgets/widgets/qlineedit.h b/src/widgets/widgets/qlineedit.h
index 3997ed16fd..f1c92b48c7 100644
--- a/src/widgets/widgets/qlineedit.h
+++ b/src/widgets/widgets/qlineedit.h
@@ -121,8 +121,8 @@ public:
     QCompleter *completer() const;
 #endif
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     int cursorPosition() const;
     void setCursorPosition(int);
@@ -204,30 +204,30 @@ Q_SIGNALS:
     void selectionChanged();
 
 protected:
-    void mousePressEvent(QMouseEvent *);
-    void mouseMoveEvent(QMouseEvent *);
-    void mouseReleaseEvent(QMouseEvent *);
-    void mouseDoubleClickEvent(QMouseEvent *);
-    void keyPressEvent(QKeyEvent *);
-    void focusInEvent(QFocusEvent *);
-    void focusOutEvent(QFocusEvent *);
-    void paintEvent(QPaintEvent *);
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 #ifndef QT_NO_DRAGANDDROP
-    void dragEnterEvent(QDragEnterEvent *);
-    void dragMoveEvent(QDragMoveEvent *e);
-    void dragLeaveEvent(QDragLeaveEvent *e);
-    void dropEvent(QDropEvent *);
+    void dragEnterEvent(QDragEnterEvent *) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QDragMoveEvent *e) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *e) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *) Q_DECL_OVERRIDE;
 #endif
-    void changeEvent(QEvent *);
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QContextMenuEvent *);
+    void contextMenuEvent(QContextMenuEvent *) Q_DECL_OVERRIDE;
 #endif
 
-    void inputMethodEvent(QInputMethodEvent *);
+    void inputMethodEvent(QInputMethodEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionFrame *option) const;
 public:
-    QVariant inputMethodQuery(Qt::InputMethodQuery) const;
-    bool event(QEvent *);
+    QVariant inputMethodQuery(Qt::InputMethodQuery) const Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
 protected:
     QRect cursorRect() const;
 
diff --git a/src/widgets/widgets/qlineedit_p.h b/src/widgets/widgets/qlineedit_p.h
index 6426329de6..95fc7551fc 100644
--- a/src/widgets/widgets/qlineedit_p.h
+++ b/src/widgets/widgets/qlineedit_p.h
@@ -81,7 +81,7 @@ public:
 #endif
 
 protected:
-    void paintEvent(QPaintEvent *event);
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
 
 private slots:
     void updateCursor();
diff --git a/src/widgets/widgets/qmainwindow.h b/src/widgets/widgets/qmainwindow.h
index 4478c47449..717bc32739 100644
--- a/src/widgets/widgets/qmainwindow.h
+++ b/src/widgets/widgets/qmainwindow.h
@@ -188,9 +188,9 @@ Q_SIGNALS:
 
 protected:
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QContextMenuEvent *event);
+    void contextMenuEvent(QContextMenuEvent *event) Q_DECL_OVERRIDE;
 #endif
-    bool event(QEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     Q_DECLARE_PRIVATE(QMainWindow)
diff --git a/src/widgets/widgets/qmainwindowlayout.cpp b/src/widgets/widgets/qmainwindowlayout.cpp
index 8f8642a72a..d14ace1b73 100644
--- a/src/widgets/widgets/qmainwindowlayout.cpp
+++ b/src/widgets/widgets/qmainwindowlayout.cpp
@@ -1243,7 +1243,7 @@ class QMainWindowTabBar : public QTabBar
 public:
     QMainWindowTabBar(QWidget *parent);
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 };
 
 QMainWindowTabBar::QMainWindowTabBar(QWidget *parent)
diff --git a/src/widgets/widgets/qmainwindowlayout_p.h b/src/widgets/widgets/qmainwindowlayout_p.h
index d9e18b03f4..4e10aef891 100644
--- a/src/widgets/widgets/qmainwindowlayout_p.h
+++ b/src/widgets/widgets/qmainwindowlayout_p.h
@@ -151,7 +151,7 @@ public:
     void setDockOptions(QMainWindow::DockOptions opts);
     bool usesHIToolBar(QToolBar *toolbar) const;
 
-    void timerEvent(QTimerEvent *e);
+    void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
 
     // status bar
 
@@ -249,17 +249,17 @@ public:
 
     // QLayout interface
 
-    void addItem(QLayoutItem *item);
-    void setGeometry(const QRect &r);
-    QLayoutItem *itemAt(int index) const;
-    QLayoutItem *takeAt(int index);
-    int count() const;
+    void addItem(QLayoutItem *item) Q_DECL_OVERRIDE;
+    void setGeometry(const QRect &r) Q_DECL_OVERRIDE;
+    QLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
+    QLayoutItem *takeAt(int index) Q_DECL_OVERRIDE;
+    int count() const Q_DECL_OVERRIDE;
 
-    QSize sizeHint() const;
-    QSize minimumSize() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
     mutable QSize szHint;
     mutable QSize minSize;
-    void invalidate();
+    void invalidate() Q_DECL_OVERRIDE;
 
     // animations
 
diff --git a/src/widgets/widgets/qmdiarea.cpp b/src/widgets/widgets/qmdiarea.cpp
index 3553baf68a..e104a3511b 100644
--- a/src/widgets/widgets/qmdiarea.cpp
+++ b/src/widgets/widgets/qmdiarea.cpp
@@ -567,9 +567,9 @@ public:
     QMdiAreaTabBar(QWidget *parent) : QTabBar(parent) {}
 
 protected:
-    void mousePressEvent(QMouseEvent *event);
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QContextMenuEvent *event);
+    void contextMenuEvent(QContextMenuEvent *event) Q_DECL_OVERRIDE;
 #endif
 
 private:
diff --git a/src/widgets/widgets/qmdiarea.h b/src/widgets/widgets/qmdiarea.h
index 18d559e21b..b824cfb4ae 100644
--- a/src/widgets/widgets/qmdiarea.h
+++ b/src/widgets/widgets/qmdiarea.h
@@ -82,8 +82,8 @@ public:
     QMdiArea(QWidget *parent = 0);
     ~QMdiArea();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     QMdiSubWindow *currentSubWindow() const;
     QMdiSubWindow *activeSubWindow() const;
@@ -135,18 +135,18 @@ public Q_SLOTS:
     void activatePreviousSubWindow();
 
 protected Q_SLOTS:
-    void setupViewport(QWidget *viewport);
+    void setupViewport(QWidget *viewport) Q_DECL_OVERRIDE;
 
 protected:
-    bool event(QEvent *event);
-    bool eventFilter(QObject *object, QEvent *event);
-    void paintEvent(QPaintEvent *paintEvent);
-    void childEvent(QChildEvent *childEvent);
-    void resizeEvent(QResizeEvent *resizeEvent);
-    void timerEvent(QTimerEvent *timerEvent);
-    void showEvent(QShowEvent *showEvent);
-    bool viewportEvent(QEvent *event);
-    void scrollContentsBy(int dx, int dy);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    bool eventFilter(QObject *object, QEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *paintEvent) Q_DECL_OVERRIDE;
+    void childEvent(QChildEvent *childEvent) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *resizeEvent) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *timerEvent) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *showEvent) Q_DECL_OVERRIDE;
+    bool viewportEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QMdiArea)
diff --git a/src/widgets/widgets/qmdiarea_p.h b/src/widgets/widgets/qmdiarea_p.h
index ba531adaad..d1341d5837 100644
--- a/src/widgets/widgets/qmdiarea_p.h
+++ b/src/widgets/widgets/qmdiarea_p.h
@@ -81,7 +81,7 @@ class RegularTiler : public Rearranger
     // Rearranges widgets according to a regular tiling pattern
     // covering the entire domain.
     // Both positions and sizes may change.
-    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;
+    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const Q_DECL_OVERRIDE;
     inline Type type() const { return Rearranger::RegularTiler; }
 };
 
@@ -90,7 +90,7 @@ class SimpleCascader : public Rearranger
     // Rearranges widgets according to a simple, regular cascading pattern.
     // Widgets are resized to minimumSize.
     // Both positions and sizes may change.
-    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;
+    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const Q_DECL_OVERRIDE;
     inline Type type() const { return Rearranger::SimpleCascader; }
 };
 
@@ -99,7 +99,7 @@ class IconTiler : public Rearranger
     // Rearranges icons (assumed to be the same size) according to a regular
     // tiling pattern filling up the domain from the bottom.
     // Only positions may change.
-    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const;
+    void rearrange(QList<QWidget *> &widgets, const QRect &domain) const Q_DECL_OVERRIDE;
     inline Type type() const { return Rearranger::IconTiler; }
 };
 
@@ -115,7 +115,7 @@ public:
 
 class MinOverlapPlacer : public Placer
 {
-    QPoint place(const QSize &size, const QVector<QRect> &rects, const QRect &domain) const;
+    QPoint place(const QSize &size, const QVector<QRect> &rects, const QRect &domain) const Q_DECL_OVERRIDE;
     static int accumulatedOverlap(const QRect &source, const QVector<QRect> &rects);
     static QRect findMinOverlapRect(const QVector<QRect> &source, const QVector<QRect> &rects);
     static QVector<QRect> getCandidatePlacements(const QSize &size, const QVector<QRect> &rects, const QRect &domain);
@@ -199,7 +199,7 @@ public:
     bool lastWindowAboutToBeDestroyed() const;
     void setChildActivationEnabled(bool enable = true, bool onlyNextActivationEvent = false) const;
     QRect resizeToMinimumTileSize(const QSize &minSubWindowSize, int subWindowCount);
-    void scrollBarPolicyChanged(Qt::Orientation, Qt::ScrollBarPolicy); // reimp
+    void scrollBarPolicyChanged(Qt::Orientation, Qt::ScrollBarPolicy) Q_DECL_OVERRIDE; // reimp
     QMdiSubWindow *nextVisibleSubWindow(int increaseFactor, QMdiArea::WindowOrder,
                                         int removed = -1, int fromIndex = -1) const;
     void highlightNextSubWindow(int increaseFactor);
diff --git a/src/widgets/widgets/qmdisubwindow.cpp b/src/widgets/widgets/qmdisubwindow.cpp
index 2340c8fe4b..d656c0abb7 100644
--- a/src/widgets/widgets/qmdisubwindow.cpp
+++ b/src/widgets/widgets/qmdisubwindow.cpp
@@ -362,18 +362,18 @@ class ControlLabel : public QWidget
 public:
     ControlLabel(QMdiSubWindow *subWindow, QWidget *parent = 0);
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 signals:
     void _q_clicked();
     void _q_doubleClicked();
 
 protected:
-    bool event(QEvent *event);
-    void paintEvent(QPaintEvent *paintEvent);
-    void mousePressEvent(QMouseEvent *mouseEvent);
-    void mouseDoubleClickEvent(QMouseEvent *mouseEvent);
-    void mouseReleaseEvent(QMouseEvent *mouseEvent);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *paintEvent) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
 
 private:
     QPixmap label;
@@ -488,7 +488,7 @@ class ControllerWidget : public QWidget
     Q_OBJECT
 public:
     ControllerWidget(QMdiSubWindow *subWindow, QWidget *parent = 0);
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
     void setControlVisible(QMdiSubWindowPrivate::WindowStateAction action, bool visible);
     inline bool hasVisibleControls() const
     {
@@ -503,12 +503,12 @@ signals:
     void _q_close();
 
 protected:
-    void paintEvent(QPaintEvent *event);
-    void mousePressEvent(QMouseEvent *event);
-    void mouseReleaseEvent(QMouseEvent *event);
-    void mouseMoveEvent(QMouseEvent *event);
-    void leaveEvent(QEvent *event);
-    bool event(QEvent *event);
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void leaveEvent(QEvent *event) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
 private:
     QStyle::SubControl activeControl;
diff --git a/src/widgets/widgets/qmdisubwindow.h b/src/widgets/widgets/qmdisubwindow.h
index a94ecfb48e..6e4d0514ee 100644
--- a/src/widgets/widgets/qmdisubwindow.h
+++ b/src/widgets/widgets/qmdisubwindow.h
@@ -63,8 +63,8 @@ public:
     QMdiSubWindow(QWidget *parent = 0, Qt::WindowFlags flags = 0);
     ~QMdiSubWindow();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     void setWidget(QWidget *widget);
     QWidget *widget() const;
@@ -101,28 +101,28 @@ public Q_SLOTS:
     void showShaded();
 
 protected:
-    bool eventFilter(QObject *object, QEvent *event);
-    bool event(QEvent *event);
-    void showEvent(QShowEvent *showEvent);
-    void hideEvent(QHideEvent *hideEvent);
-    void changeEvent(QEvent *changeEvent);
-    void closeEvent(QCloseEvent *closeEvent);
-    void leaveEvent(QEvent *leaveEvent);
-    void resizeEvent(QResizeEvent *resizeEvent);
-    void timerEvent(QTimerEvent *timerEvent);
-    void moveEvent(QMoveEvent *moveEvent);
-    void paintEvent(QPaintEvent *paintEvent);
-    void mousePressEvent(QMouseEvent *mouseEvent);
-    void mouseDoubleClickEvent(QMouseEvent *mouseEvent);
-    void mouseReleaseEvent(QMouseEvent *mouseEvent);
-    void mouseMoveEvent(QMouseEvent *mouseEvent);
-    void keyPressEvent(QKeyEvent *keyEvent);
+    bool eventFilter(QObject *object, QEvent *event) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *showEvent) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent *hideEvent) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *changeEvent) Q_DECL_OVERRIDE;
+    void closeEvent(QCloseEvent *closeEvent) Q_DECL_OVERRIDE;
+    void leaveEvent(QEvent *leaveEvent) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *resizeEvent) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *timerEvent) Q_DECL_OVERRIDE;
+    void moveEvent(QMoveEvent *moveEvent) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *paintEvent) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
+    void mouseDoubleClickEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *keyEvent) Q_DECL_OVERRIDE;
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QContextMenuEvent *contextMenuEvent);
+    void contextMenuEvent(QContextMenuEvent *contextMenuEvent) Q_DECL_OVERRIDE;
 #endif
-    void focusInEvent(QFocusEvent *focusInEvent);
-    void focusOutEvent(QFocusEvent *focusOutEvent);
-    void childEvent(QChildEvent *childEvent);
+    void focusInEvent(QFocusEvent *focusInEvent) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *focusOutEvent) Q_DECL_OVERRIDE;
+    void childEvent(QChildEvent *childEvent) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QMdiSubWindow)
diff --git a/src/widgets/widgets/qmdisubwindow_p.h b/src/widgets/widgets/qmdisubwindow_p.h
index 763f6ba039..f5cb94faea 100644
--- a/src/widgets/widgets/qmdisubwindow_p.h
+++ b/src/widgets/widgets/qmdisubwindow_p.h
@@ -260,7 +260,7 @@ public:
     void setFocusWidget();
     bool restoreFocus();
     void storeFocusWidget();
-    void setWindowFlags(Qt::WindowFlags windowFlags);
+    void setWindowFlags(Qt::WindowFlags windowFlags) Q_DECL_OVERRIDE;
     void setVisible(WindowStateAction, bool visible = true);
 #ifndef QT_NO_ACTION
     void setEnabled(WindowStateAction, bool enable = true);
diff --git a/src/widgets/widgets/qmenu.cpp b/src/widgets/widgets/qmenu.cpp
index 2c27344a4a..c9e8ed8e48 100644
--- a/src/widgets/widgets/qmenu.cpp
+++ b/src/widgets/widgets/qmenu.cpp
@@ -102,7 +102,7 @@ class QTornOffMenu : public QMenu
             causedPopup.action = ((QTornOffMenu*)p)->d_func()->causedPopup.action;
             causedStack = ((QTornOffMenu*)p)->d_func()->calcCausedStack();
         }
-        QList<QPointer<QWidget> > calcCausedStack() const { return causedStack; }
+        QList<QPointer<QWidget> > calcCausedStack() const Q_DECL_OVERRIDE { return causedStack; }
         QPointer<QMenu> causedMenu;
         QList<QPointer<QWidget> > causedStack;
     };
@@ -135,7 +135,7 @@ public:
         } else if (act->type() == QEvent::ActionRemoved)
             removeAction(act->action());
     }
-    void actionEvent(QActionEvent *e)
+    void actionEvent(QActionEvent *e) Q_DECL_OVERRIDE
     {
         QMenu::actionEvent(e);
         setFixedSize(sizeHint());
diff --git a/src/widgets/widgets/qmenu.h b/src/widgets/widgets/qmenu.h
index 0fcbb3d29b..8fd93a5a0f 100644
--- a/src/widgets/widgets/qmenu.h
+++ b/src/widgets/widgets/qmenu.h
@@ -117,7 +117,7 @@ public:
 
     static QAction *exec(QList<QAction*> actions, const QPoint &pos, QAction *at=0, QWidget *parent=0);
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     QRect actionGeometry(QAction *) const;
     QAction *actionAt(const QPoint &) const;
@@ -157,22 +157,22 @@ Q_SIGNALS:
 protected:
     int columnCount() const;
 
-    void changeEvent(QEvent *);
-    void keyPressEvent(QKeyEvent *);
-    void mouseReleaseEvent(QMouseEvent *);
-    void mousePressEvent(QMouseEvent *);
-    void mouseMoveEvent(QMouseEvent *);
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *);
+    void wheelEvent(QWheelEvent *) Q_DECL_OVERRIDE;
 #endif
-    void enterEvent(QEvent *);
-    void leaveEvent(QEvent *);
-    void hideEvent(QHideEvent *);
-    void paintEvent(QPaintEvent *);
-    void actionEvent(QActionEvent *);
-    void timerEvent(QTimerEvent *);
-    bool event(QEvent *);
-    bool focusNextPrevChild(bool next);
+    void enterEvent(QEvent *) Q_DECL_OVERRIDE;
+    void leaveEvent(QEvent *) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void actionEvent(QActionEvent *) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
+    bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionMenuItem *option, const QAction *action) const;
 
 #ifdef Q_OS_WINCE
diff --git a/src/widgets/widgets/qmenubar.cpp b/src/widgets/widgets/qmenubar.cpp
index 871af35159..97991d97b5 100644
--- a/src/widgets/widgets/qmenubar.cpp
+++ b/src/widgets/widgets/qmenubar.cpp
@@ -69,8 +69,8 @@ class QMenuBarExtension : public QToolButton
 public:
     explicit QMenuBarExtension(QWidget *parent);
 
-    QSize sizeHint() const;
-    void paintEvent(QPaintEvent *);
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 };
 
 QMenuBarExtension::QMenuBarExtension(QWidget *parent)
diff --git a/src/widgets/widgets/qplaintextedit.h b/src/widgets/widgets/qplaintextedit.h
index 9f67aaa8da..c47da891c8 100644
--- a/src/widgets/widgets/qplaintextedit.h
+++ b/src/widgets/widgets/qplaintextedit.h
@@ -176,7 +176,7 @@ public:
     void print(QPagedPaintDevice *printer) const;
 
     int blockCount() const;
-    QVariant inputMethodQuery(Qt::InputMethodQuery property) const;
+    QVariant inputMethodQuery(Qt::InputMethodQuery property) const Q_DECL_OVERRIDE;
     Q_INVOKABLE QVariant inputMethodQuery(Qt::InputMethodQuery query, QVariant argument) const;
 
 public Q_SLOTS:
@@ -218,43 +218,43 @@ Q_SIGNALS:
     void modificationChanged(bool);
 
 protected:
-    virtual bool event(QEvent *e);
-    virtual void timerEvent(QTimerEvent *e);
-    virtual void keyPressEvent(QKeyEvent *e);
-    virtual void keyReleaseEvent(QKeyEvent *e);
-    virtual void resizeEvent(QResizeEvent *e);
-    virtual void paintEvent(QPaintEvent *e);
-    virtual void mousePressEvent(QMouseEvent *e);
-    virtual void mouseMoveEvent(QMouseEvent *e);
-    virtual void mouseReleaseEvent(QMouseEvent *e);
-    virtual void mouseDoubleClickEvent(QMouseEvent *e);
-    virtual bool focusNextPrevChild(bool next);
+    virtual bool event(QEvent *e) Q_DECL_OVERRIDE;
+    virtual void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
+    virtual void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
+    virtual void keyReleaseEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
+    virtual void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
+    virtual void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
+    virtual void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual void mouseDoubleClickEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
 #ifndef QT_NO_CONTEXTMENU
-    virtual void contextMenuEvent(QContextMenuEvent *e);
+    virtual void contextMenuEvent(QContextMenuEvent *e) Q_DECL_OVERRIDE;
 #endif
 #ifndef QT_NO_DRAGANDDROP
-    virtual void dragEnterEvent(QDragEnterEvent *e);
-    virtual void dragLeaveEvent(QDragLeaveEvent *e);
-    virtual void dragMoveEvent(QDragMoveEvent *e);
-    virtual void dropEvent(QDropEvent *e);
+    virtual void dragEnterEvent(QDragEnterEvent *e) Q_DECL_OVERRIDE;
+    virtual void dragLeaveEvent(QDragLeaveEvent *e) Q_DECL_OVERRIDE;
+    virtual void dragMoveEvent(QDragMoveEvent *e) Q_DECL_OVERRIDE;
+    virtual void dropEvent(QDropEvent *e) Q_DECL_OVERRIDE;
 #endif
-    virtual void focusInEvent(QFocusEvent *e);
-    virtual void focusOutEvent(QFocusEvent *e);
-    virtual void showEvent(QShowEvent *);
-    virtual void changeEvent(QEvent *e);
+    virtual void focusInEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    virtual void focusOutEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    virtual void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
+    virtual void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    virtual void wheelEvent(QWheelEvent *e);
+    virtual void wheelEvent(QWheelEvent *e) Q_DECL_OVERRIDE;
 #endif
 
     virtual QMimeData *createMimeDataFromSelection() const;
     virtual bool canInsertFromMimeData(const QMimeData *source) const;
     virtual void insertFromMimeData(const QMimeData *source);
 
-    virtual void inputMethodEvent(QInputMethodEvent *);
+    virtual void inputMethodEvent(QInputMethodEvent *) Q_DECL_OVERRIDE;
 
     QPlainTextEdit(QPlainTextEditPrivate &dd, QWidget *parent);
 
-    virtual void scrollContentsBy(int dx, int dy);
+    virtual void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
     virtual void doSetTextCursor(const QTextCursor &cursor);
 
     QTextBlock firstVisibleBlock() const;
@@ -287,14 +287,14 @@ public:
     QPlainTextDocumentLayout(QTextDocument *document);
     ~QPlainTextDocumentLayout();
 
-    void draw(QPainter *, const PaintContext &);
-    int hitTest(const QPointF &, Qt::HitTestAccuracy ) const;
+    void draw(QPainter *, const PaintContext &) Q_DECL_OVERRIDE;
+    int hitTest(const QPointF &, Qt::HitTestAccuracy ) const Q_DECL_OVERRIDE;
 
-    int pageCount() const;
-    QSizeF documentSize() const;
+    int pageCount() const Q_DECL_OVERRIDE;
+    QSizeF documentSize() const Q_DECL_OVERRIDE;
 
-    QRectF frameBoundingRect(QTextFrame *) const;
-    QRectF blockBoundingRect(const QTextBlock &block) const;
+    QRectF frameBoundingRect(QTextFrame *) const Q_DECL_OVERRIDE;
+    QRectF blockBoundingRect(const QTextBlock &block) const Q_DECL_OVERRIDE;
 
     void ensureBlockLayout(const QTextBlock &block) const;
 
@@ -304,7 +304,7 @@ public:
     void requestUpdate();
 
 protected:
-    void documentChanged(int from, int /*charsRemoved*/, int charsAdded);
+    void documentChanged(int from, int /*charsRemoved*/, int charsAdded) Q_DECL_OVERRIDE;
 
 
 private:
diff --git a/src/widgets/widgets/qplaintextedit_p.h b/src/widgets/widgets/qplaintextedit_p.h
index 6ab8b90a0d..1e74c7b895 100644
--- a/src/widgets/widgets/qplaintextedit_p.h
+++ b/src/widgets/widgets/qplaintextedit_p.h
@@ -72,18 +72,18 @@ public:
     QPlainTextEditControl(QPlainTextEdit *parent);
 
 
-    QMimeData *createMimeDataFromSelection() const;
-    bool canInsertFromMimeData(const QMimeData *source) const;
-    void insertFromMimeData(const QMimeData *source);
-    int hitTest(const QPointF &point, Qt::HitTestAccuracy = Qt::FuzzyHit) const;
-    QRectF blockBoundingRect(const QTextBlock &block) const;
+    QMimeData *createMimeDataFromSelection() const Q_DECL_OVERRIDE;
+    bool canInsertFromMimeData(const QMimeData *source) const Q_DECL_OVERRIDE;
+    void insertFromMimeData(const QMimeData *source) Q_DECL_OVERRIDE;
+    int hitTest(const QPointF &point, Qt::HitTestAccuracy = Qt::FuzzyHit) const Q_DECL_OVERRIDE;
+    QRectF blockBoundingRect(const QTextBlock &block) const Q_DECL_OVERRIDE;
     inline QRectF cursorRect(const QTextCursor &cursor) const {
         QRectF r = QWidgetTextControl::cursorRect(cursor);
         r.setLeft(qMax(r.left(), (qreal) 0.));
         return r;
     }
     inline QRectF cursorRect() { return cursorRect(textCursor()); }
-    void ensureCursorVisible() {
+    void ensureCursorVisible() Q_DECL_OVERRIDE {
         textEdit->ensureCursorVisible();
         emit microFocusChanged();
     }
@@ -93,7 +93,7 @@ public:
     int topBlock;
     QTextBlock firstVisibleBlock() const;
 
-    QVariant loadResource(int type, const QUrl &name) {
+    QVariant loadResource(int type, const QUrl &name) Q_DECL_OVERRIDE {
         return textEdit->loadResource(type, name);
     }
 
diff --git a/src/widgets/widgets/qprogressbar.h b/src/widgets/widgets/qprogressbar.h
index 2cdcbccdb3..898656f8f4 100644
--- a/src/widgets/widgets/qprogressbar.h
+++ b/src/widgets/widgets/qprogressbar.h
@@ -77,8 +77,8 @@ public:
     Qt::Alignment alignment() const;
     void setAlignment(Qt::Alignment alignment);
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     Qt::Orientation orientation() const;
 
@@ -103,8 +103,8 @@ Q_SIGNALS:
     void valueChanged(int value);
 
 protected:
-    bool event(QEvent *e);
-    void paintEvent(QPaintEvent *);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionProgressBar *option) const;
 
 private:
diff --git a/src/widgets/widgets/qpushbutton.h b/src/widgets/widgets/qpushbutton.h
index ebf66f8ef8..5063651658 100644
--- a/src/widgets/widgets/qpushbutton.h
+++ b/src/widgets/widgets/qpushbutton.h
@@ -57,8 +57,8 @@ public:
     QPushButton(const QIcon& icon, const QString &text, QWidget *parent=0);
     ~QPushButton();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     bool autoDefault() const;
     void setAutoDefault(bool);
@@ -79,14 +79,14 @@ public Q_SLOTS:
 #endif
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 #ifdef Q_WS_MAC
     bool hitButton(const QPoint &pos) const;
 #endif // Q_WS_MAC
-    void paintEvent(QPaintEvent *);
-    void keyPressEvent(QKeyEvent *);
-    void focusInEvent(QFocusEvent *);
-    void focusOutEvent(QFocusEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;
+    void focusInEvent(QFocusEvent *) Q_DECL_OVERRIDE;
+    void focusOutEvent(QFocusEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionButton *option) const;
     QPushButton(QPushButtonPrivate &dd, QWidget* parent = 0);
 
diff --git a/src/widgets/widgets/qradiobutton.h b/src/widgets/widgets/qradiobutton.h
index 0bfb0de4e8..beda0e0d38 100644
--- a/src/widgets/widgets/qradiobutton.h
+++ b/src/widgets/widgets/qradiobutton.h
@@ -51,14 +51,14 @@ public:
     explicit QRadioButton(const QString &text, QWidget *parent=0);
     ~QRadioButton();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
 protected:
-    bool event(QEvent *e);
-    bool hitButton(const QPoint &) const;
-    void paintEvent(QPaintEvent *);
-    void mouseMoveEvent(QMouseEvent *);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    bool hitButton(const QPoint &) const Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionButton *button) const;
 
 
diff --git a/src/widgets/widgets/qrubberband.h b/src/widgets/widgets/qrubberband.h
index 7193f69f59..f46d6a8643 100644
--- a/src/widgets/widgets/qrubberband.h
+++ b/src/widgets/widgets/qrubberband.h
@@ -67,12 +67,12 @@ public:
     { resize(s.width(), s.height()); }
 
 protected:
-    bool event(QEvent *e);
-    void paintEvent(QPaintEvent *);
-    void changeEvent(QEvent *);
-    void showEvent(QShowEvent *);
-    void resizeEvent(QResizeEvent *);
-    void moveEvent(QMoveEvent *);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    void moveEvent(QMoveEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionRubberBand *option) const;
 
 private:
diff --git a/src/widgets/widgets/qscrollarea.h b/src/widgets/widgets/qscrollarea.h
index 568dbc6e4f..3ec9ca14a3 100644
--- a/src/widgets/widgets/qscrollarea.h
+++ b/src/widgets/widgets/qscrollarea.h
@@ -60,9 +60,9 @@ public:
     bool widgetResizable() const;
     void setWidgetResizable(bool resizable);
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
-    bool focusNextPrevChild(bool next);
+    bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
 
     Qt::Alignment alignment() const;
     void setAlignment(Qt::Alignment);
@@ -72,10 +72,10 @@ public:
 
 protected:
     QScrollArea(QScrollAreaPrivate &dd, QWidget *parent = 0);
-    bool event(QEvent *);
-    bool eventFilter(QObject *, QEvent *);
-    void resizeEvent(QResizeEvent *);
-    void scrollContentsBy(int dx, int dy);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
+    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
 
     QSize viewportSizeHint() const Q_DECL_OVERRIDE;
 
diff --git a/src/widgets/widgets/qscrollbar.h b/src/widgets/widgets/qscrollbar.h
index 2b67f04850..992bd511c8 100644
--- a/src/widgets/widgets/qscrollbar.h
+++ b/src/widgets/widgets/qscrollbar.h
@@ -53,21 +53,21 @@ public:
     explicit QScrollBar(Qt::Orientation, QWidget *parent=0);
     ~QScrollBar();
 
-    QSize sizeHint() const;
-    bool event(QEvent *event);
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
 protected:
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *);
+    void wheelEvent(QWheelEvent *) Q_DECL_OVERRIDE;
 #endif
-    void paintEvent(QPaintEvent *);
-    void mousePressEvent(QMouseEvent *);
-    void mouseReleaseEvent(QMouseEvent *);
-    void mouseMoveEvent(QMouseEvent *);
-    void hideEvent(QHideEvent*);
-    void sliderChange(SliderChange change);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent*) Q_DECL_OVERRIDE;
+    void sliderChange(SliderChange change) Q_DECL_OVERRIDE;
 #ifndef QT_NO_CONTEXTMENU
-    void contextMenuEvent(QContextMenuEvent *);
+    void contextMenuEvent(QContextMenuEvent *) Q_DECL_OVERRIDE;
 #endif
     void initStyleOption(QStyleOptionSlider *option) const;
 
diff --git a/src/widgets/widgets/qsizegrip.h b/src/widgets/widgets/qsizegrip.h
index 61b397e2bb..7885d0a2b7 100644
--- a/src/widgets/widgets/qsizegrip.h
+++ b/src/widgets/widgets/qsizegrip.h
@@ -48,19 +48,19 @@ public:
     explicit QSizeGrip(QWidget *parent);
     ~QSizeGrip();
 
-    QSize sizeHint() const;
-    void setVisible(bool);
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    void setVisible(bool) Q_DECL_OVERRIDE;
 
 protected:
-    void paintEvent(QPaintEvent *);
-    void mousePressEvent(QMouseEvent *);
-    void mouseMoveEvent(QMouseEvent *);
-    void mouseReleaseEvent(QMouseEvent *mouseEvent);
-    void moveEvent(QMoveEvent *moveEvent);
-    void showEvent(QShowEvent *showEvent);
-    void hideEvent(QHideEvent *hideEvent);
-    bool eventFilter(QObject *, QEvent *);
-    bool event(QEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
+    void moveEvent(QMoveEvent *moveEvent) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *showEvent) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent *hideEvent) Q_DECL_OVERRIDE;
+    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
 
 public:
 
diff --git a/src/widgets/widgets/qslider.h b/src/widgets/widgets/qslider.h
index 6d7bf7eee8..66b23e6fa3 100644
--- a/src/widgets/widgets/qslider.h
+++ b/src/widgets/widgets/qslider.h
@@ -66,8 +66,8 @@ public:
 
     ~QSlider();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     void setTickPosition(TickPosition position);
     TickPosition tickPosition() const;
@@ -75,13 +75,13 @@ public:
     void setTickInterval(int ti);
     int tickInterval() const;
 
-    bool event(QEvent *event);
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
 
 protected:
-    void paintEvent(QPaintEvent *ev);
-    void mousePressEvent(QMouseEvent *ev);
-    void mouseReleaseEvent(QMouseEvent *ev);
-    void mouseMoveEvent(QMouseEvent *ev);
+    void paintEvent(QPaintEvent *ev) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionSlider *option) const;
 
 
diff --git a/src/widgets/widgets/qspinbox.cpp b/src/widgets/widgets/qspinbox.cpp
index e8b22151fa..3fe1218b87 100644
--- a/src/widgets/widgets/qspinbox.cpp
+++ b/src/widgets/widgets/qspinbox.cpp
@@ -58,10 +58,10 @@ class QSpinBoxPrivate : public QAbstractSpinBoxPrivate
     Q_DECLARE_PUBLIC(QSpinBox)
 public:
     QSpinBoxPrivate();
-    void emitSignals(EmitPolicy ep, const QVariant &);
+    void emitSignals(EmitPolicy ep, const QVariant &) Q_DECL_OVERRIDE;
 
-    virtual QVariant valueFromText(const QString &n) const;
-    virtual QString textFromValue(const QVariant &n) const;
+    virtual QVariant valueFromText(const QString &n) const Q_DECL_OVERRIDE;
+    virtual QString textFromValue(const QVariant &n) const Q_DECL_OVERRIDE;
     QVariant validateAndInterpret(QString &input, int &pos,
                                   QValidator::State &state) const;
 
@@ -79,10 +79,10 @@ class QDoubleSpinBoxPrivate : public QAbstractSpinBoxPrivate
     Q_DECLARE_PUBLIC(QDoubleSpinBox)
 public:
     QDoubleSpinBoxPrivate();
-    void emitSignals(EmitPolicy ep, const QVariant &);
+    void emitSignals(EmitPolicy ep, const QVariant &) Q_DECL_OVERRIDE;
 
-    virtual QVariant valueFromText(const QString &n) const;
-    virtual QString textFromValue(const QVariant &n) const;
+    virtual QVariant valueFromText(const QString &n) const Q_DECL_OVERRIDE;
+    virtual QString textFromValue(const QVariant &n) const Q_DECL_OVERRIDE;
     QVariant validateAndInterpret(QString &input, int &pos,
                                   QValidator::State &state) const;
     double round(double input) const;
diff --git a/src/widgets/widgets/qsplashscreen.h b/src/widgets/widgets/qsplashscreen.h
index bb8b359831..41db23a434 100644
--- a/src/widgets/widgets/qsplashscreen.h
+++ b/src/widgets/widgets/qsplashscreen.h
@@ -66,9 +66,9 @@ Q_SIGNALS:
     void messageChanged(const QString &message);
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
     virtual void drawContents(QPainter *painter);
-    void mousePressEvent(QMouseEvent *);
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QSplashScreen)
diff --git a/src/widgets/widgets/qsplitter.h b/src/widgets/widgets/qsplitter.h
index f82c06c3bc..c08682eef2 100644
--- a/src/widgets/widgets/qsplitter.h
+++ b/src/widgets/widgets/qsplitter.h
@@ -77,8 +77,8 @@ public:
     bool opaqueResize() const;
     void refresh();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     QList<int> sizes() const;
     void setSizes(const QList<int> &list);
@@ -104,12 +104,12 @@ Q_SIGNALS:
 protected:
     virtual QSplitterHandle *createHandle();
 
-    void childEvent(QChildEvent *);
+    void childEvent(QChildEvent *) Q_DECL_OVERRIDE;
 
-    bool event(QEvent *);
-    void resizeEvent(QResizeEvent *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
 
-    void changeEvent(QEvent *);
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
     void moveSplitter(int pos, int index);
     void setRubberBand(int position);
     int closestLegalPosition(int, int);
@@ -138,15 +138,15 @@ public:
     bool opaqueResize() const;
     QSplitter *splitter() const;
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 protected:
-    void paintEvent(QPaintEvent *);
-    void mouseMoveEvent(QMouseEvent *);
-    void mousePressEvent(QMouseEvent *);
-    void mouseReleaseEvent(QMouseEvent *);
-    void resizeEvent(QResizeEvent *);
-    bool event(QEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
 
     void moveSplitter(int p);
     int closestLegalPosition(int p);
diff --git a/src/widgets/widgets/qstackedwidget.h b/src/widgets/widgets/qstackedwidget.h
index af048bc749..71191ba133 100644
--- a/src/widgets/widgets/qstackedwidget.h
+++ b/src/widgets/widgets/qstackedwidget.h
@@ -73,7 +73,7 @@ Q_SIGNALS:
     void widgetRemoved(int index);
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QStackedWidget)
diff --git a/src/widgets/widgets/qstatusbar.h b/src/widgets/widgets/qstatusbar.h
index d24680ab2a..56d45b9001 100644
--- a/src/widgets/widgets/qstatusbar.h
+++ b/src/widgets/widgets/qstatusbar.h
@@ -73,14 +73,14 @@ Q_SIGNALS:
     void messageChanged(const QString &text);
 
 protected:
-    void showEvent(QShowEvent *);
-    void paintEvent(QPaintEvent *);
-    void resizeEvent(QResizeEvent *);
+    void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
 
     // ### Qt 6: consider making reformat() and hideOrShow() private
     void reformat();
     void hideOrShow();
-    bool event(QEvent *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QStatusBar)
diff --git a/src/widgets/widgets/qtabbar.h b/src/widgets/widgets/qtabbar.h
index bdc9dae07c..5cca289020 100644
--- a/src/widgets/widgets/qtabbar.h
+++ b/src/widgets/widgets/qtabbar.h
@@ -130,8 +130,8 @@ public:
     int currentIndex() const;
     int count() const;
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     void setDrawBase(bool drawTheBase);
     bool drawBase() const;
@@ -183,20 +183,20 @@ protected:
     virtual void tabRemoved(int index);
     virtual void tabLayoutChange();
 
-    bool event(QEvent *);
-    void resizeEvent(QResizeEvent *);
-    void showEvent(QShowEvent *);
-    void hideEvent(QHideEvent *);
-    void paintEvent(QPaintEvent *);
-    void mousePressEvent (QMouseEvent *);
-    void mouseMoveEvent (QMouseEvent *);
-    void mouseReleaseEvent (QMouseEvent *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void mousePressEvent (QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseMoveEvent (QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent (QMouseEvent *) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    void wheelEvent(QWheelEvent *event);
+    void wheelEvent(QWheelEvent *event) Q_DECL_OVERRIDE;
 #endif
-    void keyPressEvent(QKeyEvent *);
-    void changeEvent(QEvent *);
-    void timerEvent(QTimerEvent *event);
+    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionTab *option, int tabIndex) const;
 
 #ifndef QT_NO_ACCESSIBILITY
diff --git a/src/widgets/widgets/qtabbar_p.h b/src/widgets/widgets/qtabbar_p.h
index b26ad20f1a..9393c94c9e 100644
--- a/src/widgets/widgets/qtabbar_p.h
+++ b/src/widgets/widgets/qtabbar_p.h
@@ -119,9 +119,9 @@ public:
             TabBarAnimation(Tab *t, QTabBarPrivate *_priv) : tab(t), priv(_priv)
             { setEasingCurve(QEasingCurve::InOutQuad); }
 
-            void updateCurrentValue(const QVariant &current);
+            void updateCurrentValue(const QVariant &current) Q_DECL_OVERRIDE;
 
-            void updateState(State, State newState);
+            void updateState(State, State newState) Q_DECL_OVERRIDE;
         private:
             //these are needed for the callbacks
             Tab *tab;
@@ -250,12 +250,12 @@ class CloseButton : public QAbstractButton
 public:
     CloseButton(QWidget *parent = 0);
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
     inline QSize minimumSizeHint() const
         { return sizeHint(); }
-    void enterEvent(QEvent *event);
-    void leaveEvent(QEvent *event);
-    void paintEvent(QPaintEvent *event);
+    void enterEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void leaveEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
 };
 
 
diff --git a/src/widgets/widgets/qtabwidget.h b/src/widgets/widgets/qtabwidget.h
index 5d9adc40e5..dc5c49c99c 100644
--- a/src/widgets/widgets/qtabwidget.h
+++ b/src/widgets/widgets/qtabwidget.h
@@ -113,10 +113,10 @@ public:
     TabShape tabShape() const;
     void setTabShape(TabShape s);
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
-    int heightForWidth(int width) const;
-    bool hasHeightForWidth() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
+    int heightForWidth(int width) const Q_DECL_OVERRIDE;
+    bool hasHeightForWidth() const Q_DECL_OVERRIDE;
 
     void setCornerWidget(QWidget * w, Qt::Corner corner = Qt::TopRightCorner);
     QWidget * cornerWidget(Qt::Corner corner = Qt::TopRightCorner) const;
@@ -154,13 +154,13 @@ protected:
     virtual void tabInserted(int index);
     virtual void tabRemoved(int index);
 
-    void showEvent(QShowEvent *);
-    void resizeEvent(QResizeEvent *);
-    void keyPressEvent(QKeyEvent *);
-    void paintEvent(QPaintEvent *);
+    void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
     void setTabBar(QTabBar *);
-    void changeEvent(QEvent *);
-    bool event(QEvent *);
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionTabWidgetFrame *option) const;
 
 
diff --git a/src/widgets/widgets/qtextbrowser.cpp b/src/widgets/widgets/qtextbrowser.cpp
index 1ef2f92804..7a02401dd1 100644
--- a/src/widgets/widgets/qtextbrowser.cpp
+++ b/src/widgets/widgets/qtextbrowser.cpp
@@ -129,7 +129,7 @@ public:
     void setSource(const QUrl &url);
 
     // re-imlemented from QTextEditPrivate
-    virtual QUrl resolveUrl(const QUrl &url) const;
+    virtual QUrl resolveUrl(const QUrl &url) const Q_DECL_OVERRIDE;
     inline QUrl resolveUrl(const QString &url) const
     { return resolveUrl(QUrl(url)); }
 
diff --git a/src/widgets/widgets/qtextbrowser.h b/src/widgets/widgets/qtextbrowser.h
index d08590cb27..de917d0bf3 100644
--- a/src/widgets/widgets/qtextbrowser.h
+++ b/src/widgets/widgets/qtextbrowser.h
@@ -65,7 +65,7 @@ public:
     QStringList searchPaths() const;
     void setSearchPaths(const QStringList &paths);
 
-    virtual QVariant loadResource(int type, const QUrl &name);
+    virtual QVariant loadResource(int type, const QUrl &name) Q_DECL_OVERRIDE;
 
     bool isBackwardAvailable() const;
     bool isForwardAvailable() const;
@@ -98,14 +98,14 @@ Q_SIGNALS:
     void anchorClicked(const QUrl &);
 
 protected:
-    bool event(QEvent *e);
-    virtual void keyPressEvent(QKeyEvent *ev);
-    virtual void mouseMoveEvent(QMouseEvent *ev);
-    virtual void mousePressEvent(QMouseEvent *ev);
-    virtual void mouseReleaseEvent(QMouseEvent *ev);
-    virtual void focusOutEvent(QFocusEvent *ev);
-    virtual bool focusNextPrevChild(bool next);
-    virtual void paintEvent(QPaintEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    virtual void keyPressEvent(QKeyEvent *ev) Q_DECL_OVERRIDE;
+    virtual void mouseMoveEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    virtual void mousePressEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    virtual void mouseReleaseEvent(QMouseEvent *ev) Q_DECL_OVERRIDE;
+    virtual void focusOutEvent(QFocusEvent *ev) Q_DECL_OVERRIDE;
+    virtual bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
+    virtual void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QTextBrowser)
diff --git a/src/widgets/widgets/qtextedit.cpp b/src/widgets/widgets/qtextedit.cpp
index 7ef864139f..a432a82ec0 100644
--- a/src/widgets/widgets/qtextedit.cpp
+++ b/src/widgets/widgets/qtextedit.cpp
@@ -77,19 +77,19 @@ class QTextEditControl : public QWidgetTextControl
 public:
     inline QTextEditControl(QObject *parent) : QWidgetTextControl(parent) {}
 
-    virtual QMimeData *createMimeDataFromSelection() const {
+    virtual QMimeData *createMimeDataFromSelection() const Q_DECL_OVERRIDE {
         QTextEdit *ed = qobject_cast<QTextEdit *>(parent());
         if (!ed)
             return QWidgetTextControl::createMimeDataFromSelection();
         return ed->createMimeDataFromSelection();
     }
-    virtual bool canInsertFromMimeData(const QMimeData *source) const {
+    virtual bool canInsertFromMimeData(const QMimeData *source) const Q_DECL_OVERRIDE {
         QTextEdit *ed = qobject_cast<QTextEdit *>(parent());
         if (!ed)
             return QWidgetTextControl::canInsertFromMimeData(source);
         return ed->canInsertFromMimeData(source);
     }
-    virtual void insertFromMimeData(const QMimeData *source) {
+    virtual void insertFromMimeData(const QMimeData *source) Q_DECL_OVERRIDE {
         QTextEdit *ed = qobject_cast<QTextEdit *>(parent());
         if (!ed)
             QWidgetTextControl::insertFromMimeData(source);
diff --git a/src/widgets/widgets/qtextedit.h b/src/widgets/widgets/qtextedit.h
index dc8deea8b6..4c5af67cca 100644
--- a/src/widgets/widgets/qtextedit.h
+++ b/src/widgets/widgets/qtextedit.h
@@ -203,7 +203,7 @@ public:
 
     void print(QPagedPaintDevice *printer) const;
 
-    QVariant inputMethodQuery(Qt::InputMethodQuery property) const;
+    QVariant inputMethodQuery(Qt::InputMethodQuery property) const Q_DECL_OVERRIDE;
     Q_INVOKABLE QVariant inputMethodQuery(Qt::InputMethodQuery query, QVariant argument) const;
 
 public Q_SLOTS:
@@ -257,43 +257,43 @@ Q_SIGNALS:
     void cursorPositionChanged();
 
 protected:
-    virtual bool event(QEvent *e);
-    virtual void timerEvent(QTimerEvent *e);
-    virtual void keyPressEvent(QKeyEvent *e);
-    virtual void keyReleaseEvent(QKeyEvent *e);
-    virtual void resizeEvent(QResizeEvent *e);
-    virtual void paintEvent(QPaintEvent *e);
-    virtual void mousePressEvent(QMouseEvent *e);
-    virtual void mouseMoveEvent(QMouseEvent *e);
-    virtual void mouseReleaseEvent(QMouseEvent *e);
-    virtual void mouseDoubleClickEvent(QMouseEvent *e);
-    virtual bool focusNextPrevChild(bool next);
+    virtual bool event(QEvent *e) Q_DECL_OVERRIDE;
+    virtual void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
+    virtual void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
+    virtual void keyReleaseEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
+    virtual void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
+    virtual void paintEvent(QPaintEvent *e) Q_DECL_OVERRIDE;
+    virtual void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual void mouseDoubleClickEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
+    virtual bool focusNextPrevChild(bool next) Q_DECL_OVERRIDE;
 #ifndef QT_NO_CONTEXTMENU
-    virtual void contextMenuEvent(QContextMenuEvent *e);
+    virtual void contextMenuEvent(QContextMenuEvent *e) Q_DECL_OVERRIDE;
 #endif
 #ifndef QT_NO_DRAGANDDROP
-    virtual void dragEnterEvent(QDragEnterEvent *e);
-    virtual void dragLeaveEvent(QDragLeaveEvent *e);
-    virtual void dragMoveEvent(QDragMoveEvent *e);
-    virtual void dropEvent(QDropEvent *e);
+    virtual void dragEnterEvent(QDragEnterEvent *e) Q_DECL_OVERRIDE;
+    virtual void dragLeaveEvent(QDragLeaveEvent *e) Q_DECL_OVERRIDE;
+    virtual void dragMoveEvent(QDragMoveEvent *e) Q_DECL_OVERRIDE;
+    virtual void dropEvent(QDropEvent *e) Q_DECL_OVERRIDE;
 #endif
-    virtual void focusInEvent(QFocusEvent *e);
-    virtual void focusOutEvent(QFocusEvent *e);
-    virtual void showEvent(QShowEvent *);
-    virtual void changeEvent(QEvent *e);
+    virtual void focusInEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    virtual void focusOutEvent(QFocusEvent *e) Q_DECL_OVERRIDE;
+    virtual void showEvent(QShowEvent *) Q_DECL_OVERRIDE;
+    virtual void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
 #ifndef QT_NO_WHEELEVENT
-    virtual void wheelEvent(QWheelEvent *e);
+    virtual void wheelEvent(QWheelEvent *e) Q_DECL_OVERRIDE;
 #endif
 
     virtual QMimeData *createMimeDataFromSelection() const;
     virtual bool canInsertFromMimeData(const QMimeData *source) const;
     virtual void insertFromMimeData(const QMimeData *source);
 
-    virtual void inputMethodEvent(QInputMethodEvent *);
+    virtual void inputMethodEvent(QInputMethodEvent *) Q_DECL_OVERRIDE;
 
     QTextEdit(QTextEditPrivate &dd, QWidget *parent);
 
-    virtual void scrollContentsBy(int dx, int dy);
+    virtual void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
     virtual void doSetTextCursor(const QTextCursor &cursor);
 
     void zoomInF(float range);
diff --git a/src/widgets/widgets/qtoolbar.h b/src/widgets/widgets/qtoolbar.h
index 6bd1411592..68d4215a70 100644
--- a/src/widgets/widgets/qtoolbar.h
+++ b/src/widgets/widgets/qtoolbar.h
@@ -135,10 +135,10 @@ Q_SIGNALS:
     void visibilityChanged(bool visible);
 
 protected:
-    void actionEvent(QActionEvent *event);
-    void changeEvent(QEvent *event);
-    void paintEvent(QPaintEvent *event);
-    bool event(QEvent *event);
+    void actionEvent(QActionEvent *event) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    bool event(QEvent *event) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionToolBar *option) const;
 
 
diff --git a/src/widgets/widgets/qtoolbarextension_p.h b/src/widgets/widgets/qtoolbarextension_p.h
index 07e3301ed7..6625419d87 100644
--- a/src/widgets/widgets/qtoolbarextension_p.h
+++ b/src/widgets/widgets/qtoolbarextension_p.h
@@ -58,8 +58,8 @@ class Q_AUTOTEST_EXPORT QToolBarExtension : public QToolButton
 
 public:
     explicit QToolBarExtension(QWidget *parent);
-    void paintEvent(QPaintEvent *);
-    QSize sizeHint() const;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
     void setOrientation(Qt::Orientation o);
diff --git a/src/widgets/widgets/qtoolbarlayout_p.h b/src/widgets/widgets/qtoolbarlayout_p.h
index 47857d6802..4cedd2b37a 100644
--- a/src/widgets/widgets/qtoolbarlayout_p.h
+++ b/src/widgets/widgets/qtoolbarlayout_p.h
@@ -61,7 +61,7 @@ class QToolBarItem : public QWidgetItem
 {
 public:
     QToolBarItem(QWidget *widget);
-    bool isEmpty() const;
+    bool isEmpty() const Q_DECL_OVERRIDE;
 
     QAction *action;
     bool customWidget;
@@ -75,22 +75,22 @@ public:
     QToolBarLayout(QWidget *parent = 0);
     ~QToolBarLayout();
 
-    void addItem(QLayoutItem *item);
-    QLayoutItem *itemAt(int index) const;
-    QLayoutItem *takeAt(int index);
-    int count() const;
+    void addItem(QLayoutItem *item) Q_DECL_OVERRIDE;
+    QLayoutItem *itemAt(int index) const Q_DECL_OVERRIDE;
+    QLayoutItem *takeAt(int index) Q_DECL_OVERRIDE;
+    int count() const Q_DECL_OVERRIDE;
 
-    bool isEmpty() const;
-    void invalidate();
-    Qt::Orientations expandingDirections() const;
+    bool isEmpty() const Q_DECL_OVERRIDE;
+    void invalidate() Q_DECL_OVERRIDE;
+    Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
 
-    void setGeometry(const QRect &r);
-    QSize minimumSize() const;
-    QSize sizeHint() const;
+    void setGeometry(const QRect &r) Q_DECL_OVERRIDE;
+    QSize minimumSize() const Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
     void insertAction(int index, QAction *action);
     int indexOf(QAction *action) const;
-    int indexOf(QWidget *widget) const { return QLayout::indexOf(widget); }
+    int indexOf(QWidget *widget) const Q_DECL_OVERRIDE { return QLayout::indexOf(widget); }
 
     bool layoutActions(const QSize &size);
     QSize expandedSize(const QSize &size) const;
diff --git a/src/widgets/widgets/qtoolbarseparator_p.h b/src/widgets/widgets/qtoolbarseparator_p.h
index 3ac46db482..b3f862cefa 100644
--- a/src/widgets/widgets/qtoolbarseparator_p.h
+++ b/src/widgets/widgets/qtoolbarseparator_p.h
@@ -64,9 +64,9 @@ public:
 
     Qt::Orientation orientation() const;
 
-    QSize sizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
 
-    void paintEvent(QPaintEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOption *option) const;
 
 public Q_SLOTS:
diff --git a/src/widgets/widgets/qtoolbox.cpp b/src/widgets/widgets/qtoolbox.cpp
index 518b975b51..83a158e59e 100644
--- a/src/widgets/widgets/qtoolbox.cpp
+++ b/src/widgets/widgets/qtoolbox.cpp
@@ -65,12 +65,12 @@ public:
     inline void setSelected(bool b) { selected = b; update(); }
     inline void setIndex(int newIndex) { indexInPage = newIndex; }
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
 protected:
     void initStyleOption(QStyleOptionToolBox *opt) const;
-    void paintEvent(QPaintEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 
 private:
     bool selected;
diff --git a/src/widgets/widgets/qtoolbox.h b/src/widgets/widgets/qtoolbox.h
index 1ea276e8ab..40bbce7d44 100644
--- a/src/widgets/widgets/qtoolbox.h
+++ b/src/widgets/widgets/qtoolbox.h
@@ -89,11 +89,11 @@ Q_SIGNALS:
     void currentChanged(int index);
 
 protected:
-    bool event(QEvent *e);
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
     virtual void itemInserted(int index);
     virtual void itemRemoved(int index);
-    void showEvent(QShowEvent *e);
-    void changeEvent(QEvent *);
+    void showEvent(QShowEvent *e) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
 
 
 private:
diff --git a/src/widgets/widgets/qtoolbutton.h b/src/widgets/widgets/qtoolbutton.h
index 922ea09abd..5301a8b22b 100644
--- a/src/widgets/widgets/qtoolbutton.h
+++ b/src/widgets/widgets/qtoolbutton.h
@@ -66,8 +66,8 @@ public:
     explicit QToolButton(QWidget * parent=0);
     ~QToolButton();
 
-    QSize sizeHint() const;
-    QSize minimumSizeHint() const;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     Qt::ToolButtonStyle toolButtonStyle() const;
 
@@ -98,19 +98,19 @@ Q_SIGNALS:
     void triggered(QAction *);
 
 protected:
-    bool event(QEvent *e);
-    void mousePressEvent(QMouseEvent *);
-    void mouseReleaseEvent(QMouseEvent *);
-    void paintEvent(QPaintEvent *);
-    void actionEvent(QActionEvent *);
-
-    void enterEvent(QEvent *);
-    void leaveEvent(QEvent *);
-    void timerEvent(QTimerEvent *);
-    void changeEvent(QEvent *);
-
-    bool hitButton(const QPoint &pos) const;
-    void nextCheckState();
+    bool event(QEvent *e) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void actionEvent(QActionEvent *) Q_DECL_OVERRIDE;
+
+    void enterEvent(QEvent *) Q_DECL_OVERRIDE;
+    void leaveEvent(QEvent *) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE;
+    void changeEvent(QEvent *) Q_DECL_OVERRIDE;
+
+    bool hitButton(const QPoint &pos) const Q_DECL_OVERRIDE;
+    void nextCheckState() Q_DECL_OVERRIDE;
     void initStyleOption(QStyleOptionToolButton *option) const;
 
 private:
diff --git a/src/widgets/widgets/qwidgetlinecontrol_p.h b/src/widgets/widgets/qwidgetlinecontrol_p.h
index f21d88177c..78edefe0f3 100644
--- a/src/widgets/widgets/qwidgetlinecontrol_p.h
+++ b/src/widgets/widgets/qwidgetlinecontrol_p.h
@@ -532,7 +532,7 @@ Q_SIGNALS:
     void editFocusChange(bool);
 #endif
 protected:
-    virtual void timerEvent(QTimerEvent *event);
+    virtual void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
 
 private Q_SLOTS:
     void _q_clipboardChanged();
diff --git a/src/widgets/widgets/qwidgetresizehandler_p.h b/src/widgets/widgets/qwidgetresizehandler_p.h
index 5b165aa7be..5c9bb50bd4 100644
--- a/src/widgets/widgets/qwidgetresizehandler_p.h
+++ b/src/widgets/widgets/qwidgetresizehandler_p.h
@@ -88,7 +88,7 @@ Q_SIGNALS:
     void activate();
 
 protected:
-    bool eventFilter(QObject *o, QEvent *e);
+    bool eventFilter(QObject *o, QEvent *e) Q_DECL_OVERRIDE;
     void mouseMoveEvent(QMouseEvent *e);
     void keyPressEvent(QKeyEvent *e);
 
diff --git a/src/widgets/widgets/qwidgettextcontrol_p.h b/src/widgets/widgets/qwidgettextcontrol_p.h
index 949201e8a8..79f4e404a2 100644
--- a/src/widgets/widgets/qwidgettextcontrol_p.h
+++ b/src/widgets/widgets/qwidgettextcontrol_p.h
@@ -242,9 +242,9 @@ public:
     bool findNextPrevAnchor(const QTextCursor& from, bool next, QTextCursor& newAnchor);
 
 protected:
-    virtual void timerEvent(QTimerEvent *e);
+    virtual void timerEvent(QTimerEvent *e) Q_DECL_OVERRIDE;
 
-    virtual bool event(QEvent *e);
+    virtual bool event(QEvent *e) Q_DECL_OVERRIDE;
 
 private:
     Q_DISABLE_COPY(QWidgetTextControl)
@@ -280,9 +280,9 @@ class QTextEditMimeData : public QMimeData
 public:
     inline QTextEditMimeData(const QTextDocumentFragment &aFragment) : fragment(aFragment) {}
 
-    virtual QStringList formats() const;
+    virtual QStringList formats() const Q_DECL_OVERRIDE;
 protected:
-    virtual QVariant retrieveData(const QString &mimeType, QVariant::Type type) const;
+    virtual QVariant retrieveData(const QString &mimeType, QVariant::Type type) const Q_DECL_OVERRIDE;
 private:
     void setup() const;
author	Olivier Goffart <ogoffart@woboq.com>	2014-11-16 13:09:01 +0100
committer	Olivier Goffart <ogoffart@woboq.com>	2014-12-03 09:57:11 +0100
commit	5180f32c5abe01acd65cde68c2c16aedda4028ec (patch)
tree	a8ed3b4af80751cdc0442c750f2915bfa9c8af40 /src/widgets
parent	2e271795e7c460254a27ea617846ff7b598a7b9b (diff)