Remove QWidget dependency from QTouchEvent.

QWidget *widget() is replaced with QObject *target().

Change-Id: Ib2c860480764410cf1527662e89f352ff688b32a
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/gui/kernel/qevent.cpp

@@ -3467,7 +3467,8 @@ QTouchEvent::QTouchEvent(QEvent::Type eventType,
                          Qt::TouchPointStates touchPointStates,
                          const QList<QTouchEvent::TouchPoint> &touchPoints)
     : QInputEvent(eventType, modifiers),
-      _widget(0),
+      _window(0),
+      _target(0),
       _device(device),
       _touchPointStates(touchPointStates),
       _touchPoints(touchPoints)
@@ -3479,11 +3480,6 @@ QTouchEvent::QTouchEvent(QEvent::Type eventType,
 QTouchEvent::~QTouchEvent()
 { }
 
-/*! \fn QWidget *QTouchEvent::widget() const
-
-    Returns the widget on which the event occurred.
-*/
-
 /*! \fn QWindow *QTouchEvent::window() const
 
     Returns the window on which the event occurred. Useful for doing
@@ -3492,6 +3488,12 @@ QTouchEvent::~QTouchEvent()
     touch event.
 */
 
+/*! \fn QObject *QTouchEvent::target() const
+
+    Returns the target object within the window on which the event occurred.
+    This is typically a QWidget or a QQuickItem. May be 0 when no specific target is available.
+*/
+
 /*! \fn QTouchEvent::DeviceType QTouchEvent::deviceType() const
 
     Returns the touch device Type, which is of type \l {QTouchEvent::DeviceType} {DeviceType}.
@@ -3521,13 +3523,6 @@ QTouchEvent::~QTouchEvent()
     Returns the touch device from which this touch event originates.
 */
 
-/*! \fn void QTouchEvent::setWidget(QWidget *widget)
-
-    \internal
-
-    Sets the widget for this event.
-*/
-
 /*! \fn void QTouchEvent::setWindow(QWindow *window)
 
     \internal
@@ -3535,6 +3530,13 @@ QTouchEvent::~QTouchEvent()
     Sets the window for this event.
 */
 
+/*! \fn void QTouchEvent::setTarget(QObject *target)
+
+    \internal
+
+    Sets the target within the window (typically a widget) for this event.
+*/
+
 /*! \fn void QTouchEvent::setTouchPointStates(Qt::TouchPointStates touchPointStates)
 
     \internal

src/gui/kernel/qevent.h

@@ -776,23 +776,23 @@ public:
                 const QList<QTouchEvent::TouchPoint> &touchPoints = QList<QTouchEvent::TouchPoint>());
     ~QTouchEvent();
 
-    inline QWidget *widget() const { return _widget; }
     inline QWindow *window() const { return _window; }
+    inline QObject *target() const { return _target; }
     QT_DEPRECATED inline QTouchEvent::DeviceType deviceType() const { return static_cast<DeviceType>(int(_device->type())); }
     inline Qt::TouchPointStates touchPointStates() const { return _touchPointStates; }
     inline const QList<QTouchEvent::TouchPoint> &touchPoints() const { return _touchPoints; }
     inline QTouchDevice *device() const { return _device; }
 
     // internal
-    inline void setWidget(QWidget *awidget) { _widget = awidget; }
     inline void setWindow(QWindow *awindow) { _window = awindow; }
+    inline void setTarget(QObject *atarget) { _target = atarget; }
     inline void setTouchPointStates(Qt::TouchPointStates aTouchPointStates) { _touchPointStates = aTouchPointStates; }
     inline void setTouchPoints(const QList<QTouchEvent::TouchPoint> &atouchPoints) { _touchPoints = atouchPoints; }
     inline void setDevice(QTouchDevice *device) { _device = device; }
 
 protected:
-    QWidget *_widget;
     QWindow *_window;
+    QObject *_target;
     QTouchDevice *_device;
     Qt::TouchPointStates _touchPointStates;
     QList<QTouchEvent::TouchPoint> _touchPoints;

src/widgets/graphicsview/qgraphicsscene.cpp

@@ -5777,8 +5777,8 @@ void QGraphicsScenePrivate::updateTouchPointsForItem(QGraphicsItem *item, QTouch
     for (int i = 0; i < touchPoints.count(); ++i) {
         QTouchEvent::TouchPoint &touchPoint = touchPoints[i];
         touchPoint.setRect(item->mapFromScene(touchPoint.sceneRect()).boundingRect());
-        touchPoint.setStartPos(item->d_ptr->genericMapFromScene(touchPoint.startScenePos(), touchEvent->widget()));
+        touchPoint.setStartPos(item->d_ptr->genericMapFromScene(touchPoint.startScenePos(), static_cast<QWidget *>(touchEvent->target())));
-        touchPoint.setLastPos(item->d_ptr->genericMapFromScene(touchPoint.lastScenePos(), touchEvent->widget()));
+        touchPoint.setLastPos(item->d_ptr->genericMapFromScene(touchPoint.lastScenePos(), static_cast<QWidget *>(touchEvent->target())));
     }
     touchEvent->setTouchPoints(touchPoints);
 }
@@ -5819,7 +5819,7 @@ void QGraphicsScenePrivate::touchEventHandler(QTouchEvent *sceneTouchEvent)
                 // determine which item this touch point will go to
                 cachedItemsUnderMouse = itemsAtPosition(touchPoint.screenPos().toPoint(),
                                                         touchPoint.scenePos(),
-                                                        sceneTouchEvent->widget());
+                                                        static_cast<QWidget *>(sceneTouchEvent->target()));
                 item = cachedItemsUnderMouse.isEmpty() ? 0 : cachedItemsUnderMouse.first();
             }
 
@@ -5888,13 +5888,13 @@ void QGraphicsScenePrivate::touchEventHandler(QTouchEvent *sceneTouchEvent)
         }
 
         QTouchEvent touchEvent(eventType);
-        touchEvent.setWidget(sceneTouchEvent->widget());
+        touchEvent.setWindow(sceneTouchEvent->window());
+        touchEvent.setTarget(sceneTouchEvent->target());
         touchEvent.setDevice(sceneTouchEvent->device());
         touchEvent.setModifiers(sceneTouchEvent->modifiers());
         touchEvent.setTouchPointStates(it.value().first);
         touchEvent.setTouchPoints(it.value().second);
         touchEvent.setTimestamp(sceneTouchEvent->timestamp());
-        touchEvent.setWindow(sceneTouchEvent->window());
 
         switch (touchEvent.type()) {
         case QEvent::TouchBegin:
@@ -5935,7 +5935,7 @@ bool QGraphicsScenePrivate::sendTouchBeginEvent(QGraphicsItem *origin, QTouchEve
         const QTouchEvent::TouchPoint &firstTouchPoint = touchEvent->touchPoints().first();
         cachedItemsUnderMouse = itemsAtPosition(firstTouchPoint.screenPos().toPoint(),
                                                 firstTouchPoint.scenePos(),
-                                                touchEvent->widget());
+                                                static_cast<QWidget *>(touchEvent->target()));
     }
     Q_ASSERT(cachedItemsUnderMouse.first() == origin);
 

src/widgets/graphicsview/qgraphicsview.cpp

@@ -2836,7 +2836,7 @@ bool QGraphicsView::viewportEvent(QEvent *event)
         if (d->scene && d->sceneInteractionAllowed) {
             // Convert and deliver the touch event to the scene.
             QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
-            touchEvent->setWidget(viewport());
+            touchEvent->setTarget(viewport());
             QGraphicsViewPrivate::translateTouchEvent(d, touchEvent);
             (void) QApplication::sendEvent(d->scene, touchEvent);
         }

src/widgets/kernel/qapplication.cpp

@@ -3896,7 +3896,7 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
         while (widget) {
             // first, try to deliver the touch event
             bool acceptTouchEvents = widget->testAttribute(Qt::WA_AcceptTouchEvents);
-            touchEvent->setWidget(widget);
+            touchEvent->setTarget(widget);
             touchEvent->setAccepted(acceptTouchEvents);
             QWeakPointer<QWidget> p = widget;
             res = acceptTouchEvents && d->notify_helper(widget, touchEvent);
@@ -3920,7 +3920,7 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
             }
             QPoint offset = widget->pos();
             widget = widget->parentWidget();
-            touchEvent->setWidget(widget);
+            touchEvent->setTarget(widget);
             for (int i = 0; i < touchEvent->_touchPoints.size(); ++i) {
                 QTouchEvent::TouchPoint &pt = touchEvent->_touchPoints[i];
                 QRectF rect = pt.rect();
@@ -5355,6 +5355,7 @@ void QApplicationPrivate::translateRawTouchEvent(QWidget *window,
         updateTouchPointsForWidget(widget, &touchEvent);
         touchEvent.setTimestamp(timestamp);
         touchEvent.setWindow(window->windowHandle());
+        touchEvent.setTarget(window);
 
         switch (touchEvent.type()) {
         case QEvent::TouchBegin: