Qt Designer: Introduce nullptr

Apply Fixits by Qt Creator with some amendments.

Change-Id: Idc948b1132fbb61c3ae6706b71659e2e8790fbc6
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>
 

18 files changed, 57 insertions, 57 deletions

diff --git a/src/designer/src/designer/appfontdialog.cpp b/src/designer/src/designer/appfontdialog.cpp
index e5a76033f..42e3ea1ab 100644
--- a/src/designer/src/designer/appfontdialog.cpp
+++ b/src/designer/src/designer/appfontdialog.cpp
@@ -215,7 +215,7 @@ const AppFontManager::FileNameFontIdPairs &AppFontManager::fonts() const
 class AppFontModel : public QStandardItemModel {
     Q_DISABLE_COPY(AppFontModel)
 public:
-    AppFontModel(QObject *parent = 0);
+    AppFontModel(QObject *parent = nullptr);
 
     void init(const AppFontManager &mgr);
     void add(const QString &fontFile, int id);
diff --git a/src/designer/src/designer/appfontdialog.h b/src/designer/src/designer/appfontdialog.h
index ca5bc3320..959b71a6d 100644
--- a/src/designer/src/designer/appfontdialog.h
+++ b/src/designer/src/designer/appfontdialog.h
@@ -49,7 +49,7 @@ class AppFontWidget : public QGroupBox
     Q_DISABLE_COPY(AppFontWidget)
     Q_OBJECT
 public:
-    explicit AppFontWidget(QWidget *parent = 0);
+    explicit AppFontWidget(QWidget *parent = nullptr);
 
     QStringList fontFiles() const;
 
@@ -77,7 +77,7 @@ class AppFontDialog : public QDialog
     Q_DISABLE_COPY(AppFontDialog)
     Q_OBJECT
 public:
-    explicit AppFontDialog(QWidget *parent = 0);
+    explicit AppFontDialog(QWidget *parent = nullptr);
 
 private:
     AppFontWidget *m_appFontWidget;
diff --git a/src/designer/src/designer/mainwindow.cpp b/src/designer/src/designer/mainwindow.cpp
index 1e882cc71..d856e396e 100644
--- a/src/designer/src/designer/mainwindow.cpp
+++ b/src/designer/src/designer/mainwindow.cpp
@@ -293,7 +293,7 @@ bool ToolBarManager::restoreState(const QByteArray &state, int version)
 DockedMainWindow::DockedMainWindow(QDesignerWorkbench *wb,
                                    QMenu *toolBarMenu,
                                    const QVector<QDesignerToolWindow *> &toolWindows) :
-    m_toolBarManager(0)
+    m_toolBarManager(nullptr)
 {
     setObjectName(QStringLiteral("MDIWindow"));
     setWindowTitle(mainWindowTitle());
diff --git a/src/designer/src/designer/mainwindow.h b/src/designer/src/designer/mainwindow.h
index 9c4687ad6..640730f89 100644
--- a/src/designer/src/designer/mainwindow.h
+++ b/src/designer/src/designer/mainwindow.h
@@ -58,7 +58,7 @@ class MainWindowBase: public QMainWindow
     Q_DISABLE_COPY(MainWindowBase)
     Q_OBJECT
 protected:
-    explicit MainWindowBase(QWidget *parent = 0, Qt::WindowFlags flags = Qt::Window);
+    explicit MainWindowBase(QWidget *parent = nullptr, Qt::WindowFlags flags = Qt::Window);
 
 public:
     enum CloseEventPolicy {
@@ -92,7 +92,7 @@ class DockedMdiArea : public QMdiArea
     Q_DISABLE_COPY(DockedMdiArea)
     Q_OBJECT
 public:
-    explicit DockedMdiArea(const QString &extension, QWidget *parent = 0);
+    explicit DockedMdiArea(const QString &extension, QWidget *parent = nullptr);
 
 signals:
     void fileDropped(const QString &);
diff --git a/src/designer/src/designer/newform.cpp b/src/designer/src/designer/newform.cpp
index b4eb49554..797e60149 100644
--- a/src/designer/src/designer/newform.cpp
+++ b/src/designer/src/designer/newform.cpp
@@ -59,9 +59,9 @@ NewForm::NewForm(QDesignerWorkbench *workbench, QWidget *parentWidget, const QSt
       m_newFormWidget(QDesignerNewFormWidgetInterface::createNewFormWidget(workbench->core())),
       m_workbench(workbench),
       m_chkShowOnStartup(new QCheckBox(tr("Show this Dialog on Startup"))),
-      m_createButton(new QPushButton(QApplication::translate("NewForm", "C&reate", 0))),
-      m_recentButton(new QPushButton(QApplication::translate("NewForm", "Recent", 0))),
-      m_buttonBox(0)
+      m_createButton(new QPushButton(QApplication::translate("NewForm", "C&reate", nullptr))),
+      m_recentButton(new QPushButton(QApplication::translate("NewForm", "Recent", nullptr))),
+      m_buttonBox(nullptr)
 {
     setWindowTitle(tr("New Form"));
     QDesignerSettings settings(m_workbench->core());
@@ -94,10 +94,10 @@ QDialogButtonBox *NewForm::createButtonBox()
 {
     // Dialog buttons with 'recent files'
     QDialogButtonBox *buttonBox = new QDialogButtonBox;
-    buttonBox->addButton(QApplication::translate("NewForm", "&Close", 0),
+    buttonBox->addButton(QApplication::translate("NewForm", "&Close", nullptr),
                          QDialogButtonBox::RejectRole);
     buttonBox->addButton(m_createButton, QDialogButtonBox::AcceptRole);
-    buttonBox->addButton(QApplication::translate("NewForm", "&Open...", 0),
+    buttonBox->addButton(QApplication::translate("NewForm", "&Open...", nullptr),
                          QDialogButtonBox::ActionRole);
     buttonBox->addButton(m_recentButton, QDialogButtonBox::ActionRole);
     QDesignerActions *da = m_workbench->actionManager();
diff --git a/src/designer/src/designer/preferencesdialog.h b/src/designer/src/designer/preferencesdialog.h
index 16b625314..654e93388 100644
--- a/src/designer/src/designer/preferencesdialog.h
+++ b/src/designer/src/designer/preferencesdialog.h
@@ -45,7 +45,7 @@ class PreferencesDialog: public QDialog
 {
     Q_OBJECT
 public:
-    explicit PreferencesDialog(QDesignerFormEditorInterface *core, QWidget *parentWidget = 0);
+    explicit PreferencesDialog(QDesignerFormEditorInterface *core, QWidget *parentWidget = nullptr);
     ~PreferencesDialog();
 
 
diff --git a/src/designer/src/designer/qdesigner.cpp b/src/designer/src/designer/qdesigner.cpp
index daec73b08..ff244ec29 100644
--- a/src/designer/src/designer/qdesigner.cpp
+++ b/src/designer/src/designer/qdesigner.cpp
@@ -58,7 +58,7 @@ QT_BEGIN_NAMESPACE
 static const char *designerApplicationName = "Designer";
 static const char designerDisplayName[] = "Qt Designer";
 static const char *designerWarningPrefix = "Designer: ";
-static QtMessageHandler previousMessageHandler = 0;
+static QtMessageHandler previousMessageHandler = nullptr;
 
 static void designerMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
 {
@@ -73,8 +73,8 @@ static void designerMessageHandler(QtMsgType type, const QMessageLogContext &con
 
 QDesigner::QDesigner(int &argc, char **argv)
     : QApplication(argc, argv),
-      m_server(0),
-      m_client(0),
+      m_server(nullptr),
+      m_client(nullptr),
       m_workbench(0), m_suppressNewFormShow(false)
 {
     setOrganizationName(QStringLiteral("QtProject"));
diff --git a/src/designer/src/designer/qdesigner_actions.cpp b/src/designer/src/designer/qdesigner_actions.cpp
index c221262da..5ac2c565c 100644
--- a/src/designer/src/designer/qdesigner_actions.cpp
+++ b/src/designer/src/designer/qdesigner_actions.cpp
@@ -138,7 +138,7 @@ static QString getSaveFileNameWithExtension(QWidget *parent, const QString &titl
 
     QString saveFile;
     while (true) {
-        saveFile = QFileDialog::getSaveFileName(parent, title, dir, filter, 0, QFileDialog::DontConfirmOverwrite);
+        saveFile = QFileDialog::getSaveFileName(parent, title, dir, filter, nullptr, QFileDialog::DontConfirmOverwrite);
         if (saveFile.isEmpty())
             return saveFile;
 
@@ -206,7 +206,7 @@ QDesignerActions::QDesignerActions(QDesignerWorkbench *workbench)
     m_quitAction->setIcon(QIcon::fromTheme(QStringLiteral("application-exit"), m_quitAction->icon()));
 #endif
 
-    Q_ASSERT(m_core != 0);
+    Q_ASSERT(m_core != nullptr);
     qdesigner_internal::QDesignerFormWindowManager *ifwm = qobject_cast<qdesigner_internal::QDesignerFormWindowManager *>(m_core->formWindowManager());
     Q_ASSERT(ifwm);
     m_previewManager = ifwm->previewManager();
@@ -238,7 +238,7 @@ QDesignerActions::QDesignerActions(QDesignerWorkbench *workbench)
     m_saveFormAction->setProperty(QDesignerActions::defaultToolbarPropertyName, true);
 
     QDesignerFormWindowManagerInterface *formWindowManager = m_core->formWindowManager();
-    Q_ASSERT(formWindowManager != 0);
+    Q_ASSERT(formWindowManager != nullptr);
 
 //
 // file actions
@@ -939,7 +939,7 @@ void QDesignerActions::shutdown()
 
 void QDesignerActions::activeFormWindowChanged(QDesignerFormWindowInterface *formWindow)
 {
-    const bool enable = formWindow != 0;
+    const bool enable = formWindow != nullptr;
     m_saveFormAction->setEnabled(enable);
     m_saveFormAsAction->setEnabled(enable);
     m_saveAllFormsAction->setEnabled(enable);
diff --git a/src/designer/src/designer/qdesigner_appearanceoptions.h b/src/designer/src/designer/qdesigner_appearanceoptions.h
index f6936252c..b0b87c796 100644
--- a/src/designer/src/designer/qdesigner_appearanceoptions.h
+++ b/src/designer/src/designer/qdesigner_appearanceoptions.h
@@ -72,7 +72,7 @@ class QDesignerAppearanceOptionsWidget : public QWidget
 {
     Q_OBJECT
 public:
-    explicit QDesignerAppearanceOptionsWidget(QWidget *parent = 0);
+    explicit QDesignerAppearanceOptionsWidget(QWidget *parent = nullptr);
     ~QDesignerAppearanceOptionsWidget();
 
     AppearanceOptions appearanceOptions() const;
diff --git a/src/designer/src/designer/qdesigner_formwindow.cpp b/src/designer/src/designer/qdesigner_formwindow.cpp
index da2324eca..77223e416 100644
--- a/src/designer/src/designer/qdesigner_formwindow.cpp
+++ b/src/designer/src/designer/qdesigner_formwindow.cpp
@@ -267,7 +267,7 @@ void QDesignerFormWindow::slotGeometryChanged()
     // so, do not do it for the main container only
     const QDesignerFormEditorInterface *core = m_editor->core();
     QObject *object = core->propertyEditor()->object();
-    if (object == 0 || !object->isWidgetType())
+    if (object == nullptr || !object->isWidgetType())
         return;
     static const QString geometryProperty = QStringLiteral("geometry");
     const QDesignerPropertySheetExtension *sheet = qt_extension<QDesignerPropertySheetExtension*>(core->extensionManager(), object);
diff --git a/src/designer/src/designer/qdesigner_formwindow.h b/src/designer/src/designer/qdesigner_formwindow.h
index e5dfb13b7..da82f2495 100644
--- a/src/designer/src/designer/qdesigner_formwindow.h
+++ b/src/designer/src/designer/qdesigner_formwindow.h
@@ -42,7 +42,7 @@ class QDesignerFormWindow: public QWidget
     Q_OBJECT
 public:
     QDesignerFormWindow(QDesignerFormWindowInterface *formWindow, QDesignerWorkbench *workbench,
-                        QWidget *parent = 0, Qt::WindowFlags flags = 0);
+                        QWidget *parent = nullptr, Qt::WindowFlags flags = {});
 
     void firstShow();
 
diff --git a/src/designer/src/designer/qdesigner_server.cpp b/src/designer/src/designer/qdesigner_server.cpp
index 42026a5f0..e223f0b2c 100644
--- a/src/designer/src/designer/qdesigner_server.cpp
+++ b/src/designer/src/designer/qdesigner_server.cpp
@@ -45,7 +45,7 @@ QT_BEGIN_NAMESPACE
 QDesignerServer::QDesignerServer(QObject *parent)
     : QObject(parent)
 {
-    m_socket = 0;
+    m_socket = nullptr;
     m_server = new QTcpServer(this);
     if (m_server->listen(QHostAddress::LocalHost, 0)) {
         connect(m_server, &QTcpServer::newConnection,
@@ -90,13 +90,13 @@ void QDesignerServer::readFromClient()
 
 void QDesignerServer::socketClosed()
 {
-    m_socket = 0;
+    m_socket = nullptr;
 }
 
 void QDesignerServer::handleNewConnection()
 {
     // no need for more than one connection
-    if (m_socket == 0) {
+    if (m_socket == nullptr) {
         m_socket = m_server->nextPendingConnection();
         connect(m_socket, &QTcpSocket::readyRead,
                 this, &QDesignerServer::readFromClient);
diff --git a/src/designer/src/designer/qdesigner_server.h b/src/designer/src/designer/qdesigner_server.h
index 2ad451b50..28eec7887 100644
--- a/src/designer/src/designer/qdesigner_server.h
+++ b/src/designer/src/designer/qdesigner_server.h
@@ -40,7 +40,7 @@ class QDesignerServer: public QObject
 {
     Q_OBJECT
 public:
-    explicit QDesignerServer(QObject *parent = 0);
+    explicit QDesignerServer(QObject *parent = nullptr);
     ~QDesignerServer() override;
 
     quint16 serverPort() const;
@@ -61,7 +61,7 @@ class QDesignerClient: public QObject
 {
     Q_OBJECT
 public:
-    explicit QDesignerClient(quint16 port, QObject *parent = 0);
+    explicit QDesignerClient(quint16 port, QObject *parent = nullptr);
     ~QDesignerClient() override;
 
 private slots:
diff --git a/src/designer/src/designer/qdesigner_toolwindow.cpp b/src/designer/src/designer/qdesigner_toolwindow.cpp
index 0c77b1dbd..e71edcb0c 100644
--- a/src/designer/src/designer/qdesigner_toolwindow.cpp
+++ b/src/designer/src/designer/qdesigner_toolwindow.cpp
@@ -145,7 +145,7 @@ QRect QDesignerToolWindow::availableToolWindowGeometry() const
 
 //  ---------------------- PropertyEditorToolWindow
 
-static inline QWidget *createPropertyEditor(QDesignerFormEditorInterface *core, QWidget *parent = 0)
+static inline QWidget *createPropertyEditor(QDesignerFormEditorInterface *core, QWidget *parent = nullptr)
 {
     QDesignerPropertyEditorInterface *widget = QDesignerComponents::createPropertyEditor(core, parent);
     core->setPropertyEditor(widget);
@@ -202,7 +202,7 @@ void PropertyEditorToolWindow::showEvent(QShowEvent *event)
 
 //  ---------------------- ActionEditorToolWindow
 
-static inline QWidget *createActionEditor(QDesignerFormEditorInterface *core, QWidget *parent = 0)
+static inline QWidget *createActionEditor(QDesignerFormEditorInterface *core, QWidget *parent = nullptr)
 {
     QDesignerActionEditorInterface *widget = QDesignerComponents::createActionEditor(core, parent);
     core->setActionEditor(widget);
@@ -244,7 +244,7 @@ QRect ActionEditorToolWindow::geometryHint() const
 
 //  ---------------------- ObjectInspectorToolWindow
 
-static inline QWidget *createObjectInspector(QDesignerFormEditorInterface *core, QWidget *parent = 0)
+static inline QWidget *createObjectInspector(QDesignerFormEditorInterface *core, QWidget *parent = nullptr)
 {
     QDesignerObjectInspectorInterface *widget = QDesignerComponents::createObjectInspector(core, parent);
     core->setObjectInspector(widget);
@@ -296,7 +296,7 @@ public:
 
 ResourceEditorToolWindow::ResourceEditorToolWindow(QDesignerWorkbench *workbench)  :
     QDesignerToolWindow(workbench,
-                        QDesignerComponents::createResourceEditor(workbench->core(), 0),
+                        QDesignerComponents::createResourceEditor(workbench->core(), nullptr),
                         QStringLiteral("qt_designer_resourceeditor"),
                         QDesignerToolWindow::tr("Resource Browser"),
                         QStringLiteral("__qt_resource_editor_tool_action"),
@@ -330,7 +330,7 @@ public:
 
 SignalSlotEditorToolWindow::SignalSlotEditorToolWindow(QDesignerWorkbench *workbench) :
     QDesignerToolWindow(workbench,
-                        QDesignerComponents::createSignalSlotEditor(workbench->core(), 0),
+                        QDesignerComponents::createSignalSlotEditor(workbench->core(), nullptr),
                         QStringLiteral("qt_designer_signalsloteditor"),
                         QDesignerToolWindow::tr("Signal/Slot Editor"),
                         QStringLiteral("__qt_signal_slot_editor_tool_action"),
@@ -354,7 +354,7 @@ QRect SignalSlotEditorToolWindow::geometryHint() const
 
 //  ---------------------- WidgetBoxToolWindow
 
-static inline QWidget *createWidgetBox(QDesignerFormEditorInterface *core, QWidget *parent = 0)
+static inline QWidget *createWidgetBox(QDesignerFormEditorInterface *core, QWidget *parent = nullptr)
 {
     QDesignerWidgetBoxInterface *widget = QDesignerComponents::createWidgetBox(core, parent);
     core->setWidgetBox(widget);
@@ -411,7 +411,7 @@ QDesignerToolWindow *QDesignerToolWindow::createStandardToolWindow(StandardToolW
     default:
         break;
     }
-    return 0;
+    return nullptr;
 }
 
 
diff --git a/src/designer/src/designer/qdesigner_toolwindow.h b/src/designer/src/designer/qdesigner_toolwindow.h
index 1049d6dcc..88ea6bb00 100644
--- a/src/designer/src/designer/qdesigner_toolwindow.h
+++ b/src/designer/src/designer/qdesigner_toolwindow.h
@@ -71,7 +71,7 @@ protected:
                                  const QString &title,
                                  const QString &actionObjectName,
                                  Qt::DockWidgetArea dockAreaHint,
-                                 QWidget *parent = 0,
+                                 QWidget *parent = nullptr,
                                  Qt::WindowFlags flags = Qt::Window);
 
 public:
diff --git a/src/designer/src/designer/qdesigner_workbench.cpp b/src/designer/src/designer/qdesigner_workbench.cpp
index 7ca7155f9..2de61bea1 100644
--- a/src/designer/src/designer/qdesigner_workbench.cpp
+++ b/src/designer/src/designer/qdesigner_workbench.cpp
@@ -90,7 +90,7 @@ static QDockWidget *dockWidgetOf(const QWidget *w)
         }
     }
     Q_ASSERT("Dock widget not found");
-    return 0;
+    return nullptr;
 }
 
 // ------------ QDesignerWorkbench::Position
@@ -330,7 +330,7 @@ Qt::WindowFlags QDesignerWorkbench::magicalWindowFlags(const QWidget *widgetForF
             return Qt::Window;
         default:
             Q_ASSERT(0);
-            return 0;
+            return nullptr;
     }
 }
 
@@ -341,12 +341,12 @@ QWidget *QDesignerWorkbench::magicalParent(const QWidget *w) const
             // Use widget box as parent for all windows except self. This will
             // result in having just one entry in the MS Windows task bar.
             QWidget *widgetBoxWrapper = widgetBoxToolWindow();
-            return w == widgetBoxWrapper ? 0 : widgetBoxWrapper;
+            return w == widgetBoxWrapper ? nullptr : widgetBoxWrapper;
         }
         case DockedMode:
             return m_dockedMainWindow->mdiArea();
         case NeutralMode:
-            return 0;
+            return nullptr;
         default:
             Q_ASSERT(0);
             return 0;
@@ -361,7 +361,7 @@ void QDesignerWorkbench::switchToNeutralMode()
 
     if (m_mode == TopLevelMode) {
         delete m_topLevelData.toolbarManager;
-        m_topLevelData.toolbarManager = 0;
+        m_topLevelData.toolbarManager = nullptr;
         qDeleteAll(m_topLevelData.toolbars);
         m_topLevelData.toolbars.clear();
     }
@@ -370,23 +370,23 @@ void QDesignerWorkbench::switchToNeutralMode()
 
     for (QDesignerToolWindow *tw : qAsConst(m_toolWindows)) {
         tw->setCloseEventPolicy(MainWindowBase::AcceptCloseEvents);
-        tw->setParent(0);
+        tw->setParent(nullptr);
     }
 
     for (QDesignerFormWindow *fw : qAsConst(m_formWindows)) {
-        fw->setParent(0);
+        fw->setParent(nullptr);
         fw->setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
     }
 
 #ifndef Q_OS_MACOS
-    m_globalMenuBar->setParent(0);
+    m_globalMenuBar->setParent(nullptr);
 #endif
 
-    m_core->setTopLevel(0);
-    qDesigner->setMainWindow(0);
+    m_core->setTopLevel(nullptr);
+    qDesigner->setMainWindow(nullptr);
 
     delete m_dockedMainWindow;
-    m_dockedMainWindow = 0;
+    m_dockedMainWindow = nullptr;
 }
 
 void QDesignerWorkbench::switchToDockedMode()
@@ -558,7 +558,7 @@ QDesignerFormWindow *QDesignerWorkbench::formWindow(int index) const
 QRect QDesignerWorkbench::desktopGeometry() const
 {
     // Return geometry of the desktop designer is running in.
-    QWidget *widget = 0;
+    QWidget *widget = nullptr;
     switch (m_mode) {
     case DockedMode:
         widget = m_dockedMainWindow;
@@ -683,7 +683,7 @@ QDesignerFormWindow *QDesignerWorkbench::findFormWindow(QWidget *widget) const
             return formWindow;
     }
 
-    return 0;
+    return nullptr;
 }
 
 bool QDesignerWorkbench::handleClose()
@@ -750,7 +750,7 @@ void QDesignerWorkbench::updateWindowMenu(QDesignerFormWindowInterface *fwi)
 {
     bool minimizeChecked = false;
     bool minimizeEnabled = false;
-    QDesignerFormWindow *activeFormWindow = 0;
+    QDesignerFormWindow *activeFormWindow = nullptr;
     do {
         if (!fwi)
             break;
@@ -800,7 +800,7 @@ bool QDesignerWorkbench::readInBackup()
         return false;
 
     const  QMessageBox::StandardButton answer =
-        QMessageBox::question(0, tr("Backup Information"),
+        QMessageBox::question(nullptr, tr("Backup Information"),
                                  tr("The last session of Designer was not terminated correctly. "
                                        "Backup files were left behind. Do you want to load them?"),
                                     QMessageBox::Yes|QMessageBox::No, QMessageBox::Yes);
@@ -908,13 +908,13 @@ QDesignerFormWindow * QDesignerWorkbench::loadForm(const QString &fileName,
 
     if (!file.open(QFile::ReadOnly|QFile::Text)) {
         *errorMessage = tr("The file <b>%1</b> could not be opened: %2").arg(file.fileName(), file.errorString());
-        return 0;
+        return nullptr;
     }
 
     // Create a form
     QDesignerFormWindowManagerInterface *formWindowManager = m_core->formWindowManager();
 
-    QDesignerFormWindow *formWindow = new QDesignerFormWindow(/*formWindow=*/ 0, this);
+    QDesignerFormWindow *formWindow = new QDesignerFormWindow(/*formWindow=*/ nullptr, this);
     addFormWindow(formWindow);
     QDesignerFormWindowInterface *editor = formWindow->editor();
     Q_ASSERT(editor);
@@ -927,7 +927,7 @@ QDesignerFormWindow * QDesignerWorkbench::loadForm(const QString &fileName,
         removeFormWindow(formWindow);
         formWindowManager->removeFormWindow(editor);
         m_core->metaDataBase()->remove(editor);
-        return 0;
+        return nullptr;
     }
 
     if (qdesigner_internal::FormWindowBase *fwb = qobject_cast<qdesigner_internal::FormWindowBase *>(editor))
@@ -967,7 +967,7 @@ QDesignerFormWindow * QDesignerWorkbench::openForm(const QString &fileName, QStr
 {
     QDesignerFormWindow *rc = loadForm(fileName, true, errorMessage);
     if (!rc)
-        return 0;
+        return nullptr;
     rc->editor()->setFileName(fileName);
     rc->firstShow();
     return rc;
@@ -979,7 +979,7 @@ QDesignerFormWindow * QDesignerWorkbench::openTemplate(const QString &templateFi
 {
     QDesignerFormWindow *rc = loadForm(templateFileName, false, errorMessage);
     if (!rc)
-        return 0;
+        return nullptr;
 
     rc->editor()->setFileName(editorFileName);
     rc->firstShow();
diff --git a/src/designer/src/designer/saveformastemplate.h b/src/designer/src/designer/saveformastemplate.h
index 14bf4ecfa..7b8f8b8da 100644
--- a/src/designer/src/designer/saveformastemplate.h
+++ b/src/designer/src/designer/saveformastemplate.h
@@ -42,7 +42,7 @@ class SaveFormAsTemplate: public QDialog
 public:
     explicit SaveFormAsTemplate(QDesignerFormEditorInterface *m_core,
                                 QDesignerFormWindowInterface *formWindow,
-                                QWidget *parent = 0);
+                                QWidget *parent = nullptr);
     ~SaveFormAsTemplate() override;
 
 private slots:
diff --git a/src/designer/src/designer/versiondialog.cpp b/src/designer/src/designer/versiondialog.cpp
index 7ae440664..9350fa397 100644
--- a/src/designer/src/designer/versiondialog.cpp
+++ b/src/designer/src/designer/versiondialog.cpp
@@ -43,7 +43,7 @@ class VersionLabel : public QLabel
 {
     Q_OBJECT
 public:
-    VersionLabel(QWidget *parent = 0);
+    VersionLabel(QWidget *parent = nullptr);
 
 signals:
     void triggered();