Propagate source/flags of QMouseEvent to QGraphicsSceneMouseEvent.

It is useful to be able to detect synthesized mouse events
in GraphicsView as well.

[ChangeLog][QtWidgets][QGraphicsSceneMouseEvent] Accessors
for Qt::MouseEventSource and Qt::MouseEventFlags were added to
QGraphicsSceneMouseEvent to enable detection of
synthesized mouse events.

Task-number: QTBUG-39814
Change-Id: Ib5835fef1f484005f9b0fc86518ed32ea79cd80f
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

src/gui/kernel/qevent.cpp

@@ -287,6 +287,8 @@ QMouseEvent::~QMouseEvent()
   \l Qt::MouseEventNotSynthesized is returned always.
 
   \sa Qt::MouseEventSource
+  \sa QGraphicsSceneMouseEvent::source()
+  \sa QGraphicsSceneMouseEvent::setSource()
  */
 Qt::MouseEventSource QMouseEvent::source() const
 {
@@ -301,6 +303,8 @@ Qt::MouseEventSource QMouseEvent::source() const
      The mouse event flags provide additional information about a mouse event.
 
      \sa Qt::MouseEventFlag
+     \sa QGraphicsSceneMouseEvent::flags()
+     \sa QGraphicsSceneMouseEvent::setFlags()
  */
 Qt::MouseEventFlags QMouseEvent::flags() const
 {

src/widgets/graphicsview/qgraphicssceneevent.cpp

@@ -348,7 +348,7 @@ class QGraphicsSceneMouseEventPrivate : public QGraphicsSceneEventPrivate
 public:
     inline QGraphicsSceneMouseEventPrivate()
         : button(Qt::NoButton),
-          buttons(0), modifiers(0)
+          buttons(0), modifiers(0), source(Qt::MouseEventNotSynthesized), flags(0)
     { }
 
     QPointF pos;
@@ -363,6 +363,8 @@ public:
     Qt::MouseButton button;
     Qt::MouseButtons buttons;
     Qt::KeyboardModifiers modifiers;
+    Qt::MouseEventSource source;
+    Qt::MouseEventFlags flags;
 };
 
 /*!
@@ -625,6 +627,60 @@ Qt::KeyboardModifiers QGraphicsSceneMouseEvent::modifiers() const
     return d->modifiers;
 }
 
+/*!
+  \since 5.4
+
+  Returns information about the mouse event source.
+
+  The mouse event source can be used to distinguish between genuine
+  and artificial mouse events. The latter are events that are
+  synthesized from touch events by the operating system or Qt itself.
+
+  \sa Qt::MouseEventSource
+  \sa QMouseEvent::source()
+ */
+Qt::MouseEventSource QGraphicsSceneMouseEvent::source() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->source;
+}
+
+/*!
+    \since 5.4
+    \internal
+ */
+void QGraphicsSceneMouseEvent::setSource(Qt::MouseEventSource source)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->source = source;
+}
+
+/*!
+     \since 5.4
+
+     Returns the mouse event flags.
+
+     The mouse event flags provide additional information about a mouse event.
+
+     \sa Qt::MouseEventFlag
+     \sa QMouseEvent::flags()
+ */
+Qt::MouseEventFlags QGraphicsSceneMouseEvent::flags() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->flags;
+}
+
+/*!
+    \since 5.4
+    \internal
+ */
+void QGraphicsSceneMouseEvent::setFlags(Qt::MouseEventFlags flags)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->flags = flags;
+}
+
 /*!
     \internal
 */

src/widgets/graphicsview/qgraphicssceneevent.h

@@ -121,6 +121,12 @@ public:
     Qt::KeyboardModifiers modifiers() const;
     void setModifiers(Qt::KeyboardModifiers modifiers);
 
+    Qt::MouseEventSource source() const;
+    void setSource(Qt::MouseEventSource source);
+
+    Qt::MouseEventFlags flags() const;
+    void setFlags(Qt::MouseEventFlags);
+
 private:
     Q_DECLARE_PRIVATE(QGraphicsSceneMouseEvent)
     Q_DISABLE_COPY(QGraphicsSceneMouseEvent)

src/widgets/graphicsview/qgraphicsview.cpp

@@ -655,6 +655,8 @@ void QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent *event)
     mouseEvent.setButtons(event->buttons());
     mouseEvent.setButton(event->button());
     mouseEvent.setModifiers(event->modifiers());
+    mouseEvent.setSource(event->source());
+    mouseEvent.setFlags(event->flags());
     lastMouseMoveScenePoint = mouseEvent.scenePos();
     lastMouseMoveScreenPoint = mouseEvent.screenPos();
     mouseEvent.setAccepted(false);
@@ -3217,6 +3219,8 @@ void QGraphicsView::mouseDoubleClickEvent(QMouseEvent *event)
     mouseEvent.setAccepted(false);
     mouseEvent.setButton(event->button());
     mouseEvent.setModifiers(event->modifiers());
+    mouseEvent.setSource(event->source());
+    mouseEvent.setFlags(event->flags());
     if (event->spontaneous())
         qt_sendSpontaneousEvent(d->scene, &mouseEvent);
     else
@@ -3265,6 +3269,8 @@ void QGraphicsView::mousePressEvent(QMouseEvent *event)
             mouseEvent.setButtons(event->buttons());
             mouseEvent.setButton(event->button());
             mouseEvent.setModifiers(event->modifiers());
+            mouseEvent.setSource(event->source());
+            mouseEvent.setFlags(event->flags());
             mouseEvent.setAccepted(false);
             if (event->spontaneous())
                 qt_sendSpontaneousEvent(d->scene, &mouseEvent);
@@ -3392,6 +3398,8 @@ void QGraphicsView::mouseReleaseEvent(QMouseEvent *event)
     mouseEvent.setButtons(event->buttons());
     mouseEvent.setButton(event->button());
     mouseEvent.setModifiers(event->modifiers());
+    mouseEvent.setSource(event->source());
+    mouseEvent.setFlags(event->flags());
     mouseEvent.setAccepted(false);
     if (event->spontaneous())
         qt_sendSpontaneousEvent(d->scene, &mouseEvent);

src/widgets/statemachine/qguistatemachine.cpp

@@ -312,6 +312,8 @@ static QEvent *cloneEvent(QEvent *e)
         me2->setButtons(me->buttons());
         me2->setButton(me->button());
         me2->setModifiers(me->modifiers());
+        me2->setSource(me->source());
+        me2->setFlags(me->flags());
         return me2;
     }
 

src/widgets/util/qflickgesture.cpp

@@ -101,6 +101,8 @@ static QMouseEvent *copyMouseEvent(QEvent *e)
         copy->setButtons(me->buttons());
         copy->setButton(me->button());
         copy->setModifiers(me->modifiers());
+        copy->setSource(me->source());
+        copy->setFlags(me->flags());
         return copy;
 #endif
     }