Fix casting. Casting is now done through the virtual interface_cast.

Change interface_cast to return void* to avoid using virtual
inheritance.
Get rid of the magic Q_ACCESSIBLE_OBJECT macro.

Change-Id: I94b824aef53f2ba657d39d406b387c8681d47ee4
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>

18 files changed, 112 insertions, 104 deletions

diff --git a/src/gui/accessible/qaccessible.cpp b/src/gui/accessible/qaccessible.cpp
index 6553ebb6b1..29b9a20b93 100644
--- a/src/gui/accessible/qaccessible.cpp
+++ b/src/gui/accessible/qaccessible.cpp
@@ -1203,12 +1203,6 @@ QVariant QAccessibleInterface::virtual_hook(const QVariant &)
     return QVariant();
 }
 
-/*! \internal */
-QAccessible2Interface *QAccessibleInterface::cast_helper(QAccessible2::InterfaceType t)
-{
-    return interface_cast(t);
-}
-
 #ifndef QT_NO_DEBUG_STREAM
 Q_GUI_EXPORT QDebug operator<<(QDebug d, const QAccessibleInterface *iface)
 {
diff --git a/src/gui/accessible/qaccessible.h b/src/gui/accessible/qaccessible.h
index 0835793418..f374e05dc2 100644
--- a/src/gui/accessible/qaccessible.h
+++ b/src/gui/accessible/qaccessible.h
@@ -309,6 +309,17 @@ public:
         BackgroundColor           = 4
     };
 
+    enum InterfaceType
+    {
+        TextInterface,
+        EditableTextInterface,
+        ValueInterface,
+        TableInterface,
+        ActionInterface,
+        ImageInterface,
+        Table2Interface
+    };
+
     typedef QAccessibleInterface*(*InterfaceFactory)(const QString &key, QObject*);
     typedef void(*UpdateHandler)(QObject*, int who, Event reason);
     typedef void(*RootObjectHandler)(QObject*);
@@ -336,20 +347,6 @@ QT_END_NAMESPACE
 Q_DECLARE_METATYPE(QSet<QAccessible::Method>)
 QT_BEGIN_NAMESPACE
 
-namespace QAccessible2
-{
-    enum InterfaceType
-    {
-        TextInterface,
-        EditableTextInterface,
-        ValueInterface,
-        TableInterface,
-        ActionInterface,
-        ImageInterface,
-        Table2Interface
-    };
-}
-
 class QAccessible2Interface;
 class QAccessibleTextInterface;
 class QAccessibleEditableTextInterface;
@@ -397,33 +394,31 @@ public:
     { return qvariant_cast<QSet<Method> >(invokeMethod(ListSupportedMethods)); }
 
     inline QAccessibleTextInterface *textInterface()
-    { return reinterpret_cast<QAccessibleTextInterface *>(cast_helper(QAccessible2::TextInterface)); }
+    { return reinterpret_cast<QAccessibleTextInterface *>(interface_cast(QAccessible::TextInterface)); }
 
     inline QAccessibleEditableTextInterface *editableTextInterface()
-    { return reinterpret_cast<QAccessibleEditableTextInterface *>(cast_helper(QAccessible2::EditableTextInterface)); }
+    { return reinterpret_cast<QAccessibleEditableTextInterface *>(interface_cast(QAccessible::EditableTextInterface)); }
 
     inline QAccessibleValueInterface *valueInterface()
-    { return reinterpret_cast<QAccessibleValueInterface *>(cast_helper(QAccessible2::ValueInterface)); }
+    { return reinterpret_cast<QAccessibleValueInterface *>(interface_cast(QAccessible::ValueInterface)); }
 
     inline QAccessibleTableInterface *tableInterface()
-    { return reinterpret_cast<QAccessibleTableInterface *>(cast_helper(QAccessible2::TableInterface)); }
+    { return reinterpret_cast<QAccessibleTableInterface *>(interface_cast(QAccessible::TableInterface)); }
 
     inline QAccessibleActionInterface *actionInterface()
-    { return reinterpret_cast<QAccessibleActionInterface *>(cast_helper(QAccessible2::ActionInterface)); }
+    { return reinterpret_cast<QAccessibleActionInterface *>(interface_cast(QAccessible::ActionInterface)); }
 
     inline QAccessibleImageInterface *imageInterface()
-    { return reinterpret_cast<QAccessibleImageInterface *>(cast_helper(QAccessible2::ImageInterface)); }
+    { return reinterpret_cast<QAccessibleImageInterface *>(interface_cast(QAccessible::ImageInterface)); }
 
     inline QAccessibleTable2Interface *table2Interface()
-    { return reinterpret_cast<QAccessibleTable2Interface *>(cast_helper(QAccessible2::Table2Interface)); }
+    { return reinterpret_cast<QAccessibleTable2Interface *>(interface_cast(QAccessible::Table2Interface)); }
 
     // FIXME
     virtual QVariant virtual_hook(const QVariant &data);
-    virtual QAccessible2Interface *interface_cast(QAccessible2::InterfaceType)
+    virtual void *interface_cast(QAccessible::InterfaceType)
     { return 0; }
-
 private:
-    QAccessible2Interface *cast_helper(QAccessible2::InterfaceType);
 };
 
 class QAccessibleEvent : public QEvent
diff --git a/src/gui/accessible/qaccessible2.h b/src/gui/accessible/qaccessible2.h
index 52dde4850a..e0db9e039b 100644
--- a/src/gui/accessible/qaccessible2.h
+++ b/src/gui/accessible/qaccessible2.h
@@ -91,50 +91,9 @@ namespace QAccessible2
     };
 }
 
-class Q_GUI_EXPORT QAccessible2Interface
+class Q_GUI_EXPORT QAccessibleTextInterface
 {
 public:
-    virtual ~QAccessible2Interface() {}
-};
-
-// catch-all functions. If an accessible class doesn't implement interface T, return 0
-inline QAccessible2Interface *qAccessibleValueCastHelper() { return 0; }
-inline QAccessible2Interface *qAccessibleTextCastHelper() { return 0; }
-inline QAccessible2Interface *qAccessibleEditableTextCastHelper() { return 0; }
-inline QAccessible2Interface *qAccessibleTableCastHelper() { return 0; }
-inline QAccessible2Interface *qAccessibleActionCastHelper() { return 0; }
-inline QAccessible2Interface *qAccessibleImageCastHelper() { return 0; }
-inline QAccessible2Interface *qAccessibleTable2CastHelper() { return 0; }
-
-#define Q_ACCESSIBLE_OBJECT \
-    public: \
-    QAccessible2Interface *interface_cast(QAccessible2::InterfaceType t) \
-    { \
-        switch (t) { \
-        case QAccessible2::TextInterface: \
-            return qAccessibleTextCastHelper(); \
-        case QAccessible2::EditableTextInterface: \
-            return qAccessibleEditableTextCastHelper(); \
-        case QAccessible2::ValueInterface: \
-            return qAccessibleValueCastHelper(); \
-        case QAccessible2::TableInterface: \
-            return qAccessibleTableCastHelper(); \
-        case QAccessible2::ActionInterface: \
-            return qAccessibleActionCastHelper(); \
-        case QAccessible2::ImageInterface: \
-            return qAccessibleImageCastHelper(); \
-        case QAccessible2::Table2Interface: \
-            return qAccessibleTable2CastHelper(); \
-        } \
-        return 0; \
-    } \
-    private:
-
-class Q_GUI_EXPORT QAccessibleTextInterface: public QAccessible2Interface
-{
-public:
-    inline QAccessible2Interface *qAccessibleTextCastHelper() { return this; }
-
     virtual ~QAccessibleTextInterface() {}
 
     virtual void addSelection(int startOffset, int endOffset) = 0;
@@ -158,11 +117,9 @@ public:
     virtual void scrollToSubstring(int startIndex, int endIndex) = 0;
 };
 
-class Q_GUI_EXPORT QAccessibleEditableTextInterface: public QAccessible2Interface
+class Q_GUI_EXPORT QAccessibleEditableTextInterface
 {
 public:
-    inline QAccessible2Interface *qAccessibleEditableTextCastHelper() { return this; }
-
     virtual ~QAccessibleEditableTextInterface() {}
 
     virtual void copyText(int startOffset, int endOffset) = 0;
@@ -177,7 +134,7 @@ public:
 class Q_GUI_EXPORT QAccessibleSimpleEditableTextInterface: public QAccessibleEditableTextInterface
 {
 public:
-    QAccessibleSimpleEditableTextInterface(QAccessibleInterface *accessibleInterface);
+    QAccessibleSimpleEditableTextInterface(QAccessibleInterface *accessibleInterface);  //###
 
     void copyText(int startOffset, int endOffset);
     void deleteText(int startOffset, int endOffset);
@@ -191,10 +148,9 @@ private:
     QAccessibleInterface *iface;
 };
 
-class Q_GUI_EXPORT QAccessibleValueInterface: public QAccessible2Interface
+class Q_GUI_EXPORT QAccessibleValueInterface
 {
 public:
-    inline QAccessible2Interface *qAccessibleValueCastHelper() { return this; }
 
     virtual ~QAccessibleValueInterface() {}
 
@@ -204,10 +160,10 @@ public:
     virtual QVariant minimumValue() = 0;
 };
 
-class Q_GUI_EXPORT QAccessibleTableInterface: public QAccessible2Interface
+class Q_GUI_EXPORT QAccessibleTableInterface
 {
 public:
-    inline QAccessible2Interface *qAccessibleTableCastHelper() { return this; }
+
 
     virtual QAccessibleInterface *accessibleAt(int row, int column) = 0;
     virtual QAccessibleInterface *caption() = 0;
@@ -267,10 +223,9 @@ public:
     virtual bool isExpandable() const = 0;
 };
 
-class Q_GUI_EXPORT QAccessibleTable2Interface: public QAccessible2Interface
+class Q_GUI_EXPORT QAccessibleTable2Interface
 {
 public:
-    inline QAccessible2Interface *qAccessibleTable2CastHelper() { return this; }
 
     // Returns the cell at the specified row and column in the table.
     virtual QAccessibleTable2CellInterface *cellAt (int row, int column) const = 0;
@@ -327,11 +282,10 @@ friend class QAbstractItemView;
 friend class QAbstractItemViewPrivate;
 };
 
-class Q_GUI_EXPORT QAccessibleActionInterface: public QAccessible2Interface
+class Q_GUI_EXPORT QAccessibleActionInterface
 {
     Q_DECLARE_TR_FUNCTIONS(QAccessibleActionInterface)
 public:
-    inline QAccessible2Interface *qAccessibleActionCastHelper() { return this; }
 
     virtual QStringList actionNames() const = 0;
     virtual QString localizedActionName(const QString &name) const;
@@ -348,10 +302,9 @@ public:
     static const QString &uncheckAction();
 };
 
-class Q_GUI_EXPORT QAccessibleImageInterface : public QAccessible2Interface
+class Q_GUI_EXPORT QAccessibleImageInterface
 {
 public:
-    inline QAccessible2Interface *qAccessibleImageCastHelper() { return this; }
 
     virtual QString imageDescription() = 0;
     virtual QSize imageSize() = 0;
diff --git a/src/gui/accessible/qaccessibleobject.h b/src/gui/accessible/qaccessibleobject.h
index 6a02dc86c7..75d277f05b 100644
--- a/src/gui/accessible/qaccessibleobject.h
+++ b/src/gui/accessible/qaccessibleobject.h
@@ -78,7 +78,6 @@ private:
 
 class Q_GUI_EXPORT QAccessibleApplication : public QAccessibleObject
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     QAccessibleApplication();
 
diff --git a/src/plugins/accessible/widgets/complexwidgets.cpp b/src/plugins/accessible/widgets/complexwidgets.cpp
index 766d18dbff..f5145bf537 100644
--- a/src/plugins/accessible/widgets/complexwidgets.cpp
+++ b/src/plugins/accessible/widgets/complexwidgets.cpp
@@ -1451,12 +1451,18 @@ QAccessible::State QAccessibleHeader::state(int child) const
 
 class QAccessibleTabButton: public QAccessibleInterface, public QAccessibleActionInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     QAccessibleTabButton(QTabBar *parent, int index)
         : m_parent(parent), m_index(index)
     {}
 
+    void *interface_cast(QAccessible::InterfaceType t) {
+        if (t == QAccessible::ActionInterface) {
+            return static_cast<QAccessibleActionInterface*>(this);
+        }
+        return 0;
+    }
+
     QObject *object() const { return 0; }
     Role role() const { return QAccessible::PageTab; }
     State state() const {
diff --git a/src/plugins/accessible/widgets/complexwidgets.h b/src/plugins/accessible/widgets/complexwidgets.h
index 53997b96ff..f094719a6c 100644
--- a/src/plugins/accessible/widgets/complexwidgets.h
+++ b/src/plugins/accessible/widgets/complexwidgets.h
@@ -103,7 +103,6 @@ public:
 #ifndef QT_NO_ITEMVIEWS
 class QAccessibleHeader : public QAccessibleWidget
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleHeader(QWidget *w);
 
@@ -162,7 +161,6 @@ private:
 
 class QAccessibleItemView: public QAccessibleAbstractScrollArea, public QAccessibleTableInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleItemView(QWidget *w);
 
@@ -232,7 +230,6 @@ private:
 #ifndef QT_NO_TABBAR
 class QAccessibleTabBar : public QAccessibleWidget
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleTabBar(QWidget *w);
 
@@ -254,7 +251,6 @@ protected:
 #ifndef QT_NO_COMBOBOX
 class QAccessibleComboBox : public QAccessibleWidget
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleComboBox(QWidget *w);
 
diff --git a/src/plugins/accessible/widgets/itemviews.cpp b/src/plugins/accessible/widgets/itemviews.cpp
index 6abc27b2a1..6b986154b7 100644
--- a/src/plugins/accessible/widgets/itemviews.cpp
+++ b/src/plugins/accessible/widgets/itemviews.cpp
@@ -470,6 +470,13 @@ QAccessible::Relation QAccessibleTable2::relationTo(const QAccessibleInterface *
     return QAccessible::Unrelated;
 }
 
+void *QAccessibleTable2::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::Table2Interface)
+       return static_cast<QAccessibleTable2Interface*>(this);
+   return 0;
+}
+
 // TREE VIEW
 
 QModelIndex QAccessibleTree::indexFromLogical(int row, int column) const
diff --git a/src/plugins/accessible/widgets/itemviews.h b/src/plugins/accessible/widgets/itemviews.h
index deee866c34..80d22650d4 100644
--- a/src/plugins/accessible/widgets/itemviews.h
+++ b/src/plugins/accessible/widgets/itemviews.h
@@ -60,7 +60,6 @@ class QAccessibleTable2HeaderCell;
 
 class QAccessibleTable2 :public QAccessibleTable2Interface, public QAccessibleObject
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleTable2(QWidget *w);
 
@@ -82,6 +81,7 @@ public:
     Relation relationTo(const QAccessibleInterface *other) const;
 
     QVariant invokeMethod(Method, const QVariantList &) { return QVariant(); }
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // table2 interface
     virtual QAccessibleTable2CellInterface *cellAt(int row, int column) const;
diff --git a/src/plugins/accessible/widgets/qaccessiblemenu.cpp b/src/plugins/accessible/widgets/qaccessiblemenu.cpp
index edf74105e6..ed221c6172 100644
--- a/src/plugins/accessible/widgets/qaccessiblemenu.cpp
+++ b/src/plugins/accessible/widgets/qaccessiblemenu.cpp
@@ -277,6 +277,13 @@ int QAccessibleMenuItem::navigate(RelationFlag relation, int entry, QAccessibleI
     return *target ? 0 : -1;
 }
 
+void *QAccessibleMenuItem::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::ActionInterface)
+        return static_cast<QAccessibleActionInterface*>(this);
+    return 0;
+}
+
 QObject *QAccessibleMenuItem::object() const
 {
     return m_action;
diff --git a/src/plugins/accessible/widgets/qaccessiblemenu.h b/src/plugins/accessible/widgets/qaccessiblemenu.h
index ae5c4ba8cd..7c7956e988 100644
--- a/src/plugins/accessible/widgets/qaccessiblemenu.h
+++ b/src/plugins/accessible/widgets/qaccessiblemenu.h
@@ -92,11 +92,12 @@ protected:
 
 class QAccessibleMenuItem : public QAccessibleInterface, public QAccessibleActionInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleMenuItem(QWidget *owner, QAction *w);
 
     virtual ~QAccessibleMenuItem();
+
+    void *interface_cast(QAccessible::InterfaceType t);
     virtual int childAt(int x, int y) const;
     virtual int childCount() const;
     virtual int indexOfChild(const QAccessibleInterface * child) const;
diff --git a/src/plugins/accessible/widgets/qaccessiblewidgets.cpp b/src/plugins/accessible/widgets/qaccessiblewidgets.cpp
index d2d56065d0..9dec243dd7 100644
--- a/src/plugins/accessible/widgets/qaccessiblewidgets.cpp
+++ b/src/plugins/accessible/widgets/qaccessiblewidgets.cpp
@@ -302,6 +302,15 @@ QVariant QAccessibleTextEdit::invokeMethod(QAccessible::Method method,
     }
 }
 
+void *QAccessibleTextEdit::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::TextInterface)
+        return static_cast<QAccessibleTextInterface*>(this);
+    else if (t == QAccessible::EditableTextInterface)
+        return static_cast<QAccessibleEditableTextInterface*>(this);
+    return QAccessibleWidget::interface_cast(t);
+}
+
 void QAccessibleTextEdit::addSelection(int startOffset, int endOffset)
 {
     setSelection(0, startOffset, endOffset);
diff --git a/src/plugins/accessible/widgets/qaccessiblewidgets.h b/src/plugins/accessible/widgets/qaccessiblewidgets.h
index 04de22bb1e..b416469dc6 100644
--- a/src/plugins/accessible/widgets/qaccessiblewidgets.h
+++ b/src/plugins/accessible/widgets/qaccessiblewidgets.h
@@ -69,7 +69,6 @@ class QMainWindow;
 class QAccessibleTextEdit : public QAccessibleWidget, public QAccessibleTextInterface,
                             public QAccessibleEditableTextInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleTextEdit(QWidget *o);
 
@@ -77,6 +76,7 @@ public:
     void setText(Text t, const QString &text);
 
     QVariant invokeMethod(QAccessible::Method method, const QVariantList &params);
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // QAccessibleTextInterface
     void addSelection(int startOffset, int endOffset);
@@ -118,7 +118,6 @@ private:
 
 class QAccessibleStackedWidget : public QAccessibleWidget
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleStackedWidget(QWidget *widget);
 
@@ -135,7 +134,6 @@ protected:
 
 class QAccessibleToolBox : public QAccessibleWidget
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleToolBox(QWidget *widget);
 
diff --git a/src/plugins/accessible/widgets/rangecontrols.cpp b/src/plugins/accessible/widgets/rangecontrols.cpp
index db10a1bff3..684b45d7c5 100644
--- a/src/plugins/accessible/widgets/rangecontrols.cpp
+++ b/src/plugins/accessible/widgets/rangecontrols.cpp
@@ -87,6 +87,13 @@ QString QAccessibleAbstractSpinBox::text(Text t) const
     return QAccessibleWidget::text(t);
 }
 
+void *QAccessibleAbstractSpinBox::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::ValueInterface)
+        return static_cast<QAccessibleValueInterface*>(this);
+    return QAccessibleWidget::interface_cast(t);
+}
+
 QVariant QAccessibleAbstractSpinBox::currentValue()
 {
     QVariant result = abstractSpinBox()->property("value");
@@ -244,6 +251,13 @@ QAccessibleAbstractSlider::QAccessibleAbstractSlider(QWidget *w, Role r)
     Q_ASSERT(qobject_cast<QAbstractSlider *>(w));
 }
 
+void *QAccessibleAbstractSlider::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::ValueInterface)
+        return static_cast<QAccessibleValueInterface*>(this);
+    return QAccessibleWidget::interface_cast(t);
+}
+
 QVariant QAccessibleAbstractSlider::currentValue()
 {
     return abstractSlider()->value();
diff --git a/src/plugins/accessible/widgets/rangecontrols.h b/src/plugins/accessible/widgets/rangecontrols.h
index 6719329cd8..59eb8f934a 100644
--- a/src/plugins/accessible/widgets/rangecontrols.h
+++ b/src/plugins/accessible/widgets/rangecontrols.h
@@ -60,11 +60,11 @@ class QDial;
 #ifndef QT_NO_SPINBOX
 class QAccessibleAbstractSpinBox: public QAccessibleWidget, public QAccessibleValueInterface // TODO, public QAccessibleActionInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleAbstractSpinBox(QWidget *w);
 
     QString text(Text t) const;
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // QAccessibleValueInterface
     QVariant currentValue();
@@ -101,9 +101,9 @@ protected:
 
 class QAccessibleAbstractSlider: public QAccessibleWidget, public QAccessibleValueInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleAbstractSlider(QWidget *w, Role r = Slider);
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // QAccessibleValueInterface
     QVariant currentValue();
diff --git a/src/plugins/accessible/widgets/simplewidgets.cpp b/src/plugins/accessible/widgets/simplewidgets.cpp
index f83c9fe30e..28661f0fc3 100644
--- a/src/plugins/accessible/widgets/simplewidgets.cpp
+++ b/src/plugins/accessible/widgets/simplewidgets.cpp
@@ -474,6 +474,13 @@ int QAccessibleDisplay::navigate(RelationFlag rel, int entry, QAccessibleInterfa
     return QAccessibleWidget::navigate(rel, entry, target);
 }
 
+void *QAccessibleDisplay::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::ImageInterface)
+        return static_cast<QAccessibleImageInterface*>(this);
+    return QAccessibleWidget::interface_cast(t);
+}
+
 /*! \internal */
 QString QAccessibleDisplay::imageDescription()
 {
@@ -614,6 +621,15 @@ QVariant QAccessibleLineEdit::invokeMethod(QAccessible::Method method,
     }
 }
 
+void *QAccessibleLineEdit::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::TextInterface)
+        return static_cast<QAccessibleTextInterface*>(this);
+    else if (t == QAccessible::EditableTextInterface)
+        return static_cast<QAccessibleEditableTextInterface*>(this);
+    return QAccessibleWidget::interface_cast(t);
+}
+
 void QAccessibleLineEdit::addSelection(int startOffset, int endOffset)
 {
     setSelection(0, startOffset, endOffset);
@@ -743,6 +759,13 @@ QAccessibleProgressBar::QAccessibleProgressBar(QWidget *o)
     Q_ASSERT(progressBar());
 }
 
+void *QAccessibleProgressBar::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::ValueInterface)
+        return static_cast<QAccessibleValueInterface*>(this);
+    return QAccessibleDisplay::interface_cast(t);
+}
+
 QVariant QAccessibleProgressBar::currentValue()
 {
     return progressBar()->value();
diff --git a/src/plugins/accessible/widgets/simplewidgets.h b/src/plugins/accessible/widgets/simplewidgets.h
index 25c3150386..35fa6ee9b8 100644
--- a/src/plugins/accessible/widgets/simplewidgets.h
+++ b/src/plugins/accessible/widgets/simplewidgets.h
@@ -57,7 +57,6 @@ class QProgressBar;
 
 class QAccessibleButton : public QAccessibleWidget
 {
-    Q_ACCESSIBLE_OBJECT
     Q_DECLARE_TR_FUNCTIONS(QAccessibleButton)
 public:
     QAccessibleButton(QWidget *w, Role r);
@@ -99,7 +98,6 @@ protected:
 
 class QAccessibleDisplay : public QAccessibleWidget, public QAccessibleImageInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleDisplay(QWidget *w, Role role = StaticText);
 
@@ -108,6 +106,7 @@ public:
 
     Relation relationTo(const QAccessibleInterface *other) const;
     int navigate(RelationFlag, int entry, QAccessibleInterface **target) const;
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // QAccessibleImageInterface
     QString imageDescription();
@@ -119,7 +118,6 @@ public:
 class QAccessibleLineEdit : public QAccessibleWidget, public QAccessibleTextInterface,
                             public QAccessibleSimpleEditableTextInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleLineEdit(QWidget *o, const QString &name = QString());
 
@@ -127,6 +125,7 @@ public:
     void setText(Text t, const QString &text);
     State state() const;
     QVariant invokeMethod(QAccessible::Method method, const QVariantList &params);
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // QAccessibleTextInterface
     void addSelection(int startOffset, int endOffset);
@@ -157,9 +156,9 @@ protected:
 #ifndef QT_NO_PROGRESSBAR
 class QAccessibleProgressBar : public QAccessibleDisplay, public QAccessibleValueInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleProgressBar(QWidget *o);
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // QAccessibleValueInterface
     QVariant currentValue();
diff --git a/src/widgets/accessible/qaccessiblewidget.cpp b/src/widgets/accessible/qaccessiblewidget.cpp
index 9afb45c45e..30b21d3146 100644
--- a/src/widgets/accessible/qaccessiblewidget.cpp
+++ b/src/widgets/accessible/qaccessiblewidget.cpp
@@ -875,6 +875,13 @@ QColor QAccessibleWidget::backgroundColor() const
     return widget()->palette().color(widget()->backgroundRole());
 }
 
+void *QAccessibleWidget::interface_cast(QAccessible::InterfaceType t)
+{
+    if (t == QAccessible::ActionInterface)
+       return static_cast<QAccessibleActionInterface*>(this);
+    return 0;
+}
+
 QT_END_NAMESPACE
 
 #endif //QT_NO_ACCESSIBILITY
diff --git a/src/widgets/accessible/qaccessiblewidget.h b/src/widgets/accessible/qaccessiblewidget.h
index 87edf75f0e..cc86c46581 100644
--- a/src/widgets/accessible/qaccessiblewidget.h
+++ b/src/widgets/accessible/qaccessiblewidget.h
@@ -56,7 +56,6 @@ class QAccessibleWidgetPrivate;
 
 class Q_WIDGETS_EXPORT QAccessibleWidget : public QAccessibleObject, public QAccessibleActionInterface
 {
-    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleWidget(QWidget *o, Role r = Client, const QString& name = QString());
 
@@ -79,6 +78,7 @@ public:
     QColor foregroundColor() const;
     QColor backgroundColor() const;
 
+    void *interface_cast(QAccessible::InterfaceType t);
 
     // QAccessibleActionInterface
     QStringList actionNames() const;