QQuickPointerEvent: guard all access to m_event

QQuickWindowPrivate::pointerEventInstance(device, eventType) returns
a pointer event which is not based on a QEvent: m_event will be null.
This is useful for delivering hover events, but the qDebug operator<<
crashes when it tries to print the timestamp, if we don't check for
null m_event.

Change-Id: Id3a93a1ffcae78cbf287f724da9c012a6b546b0b
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/quick/items/qquickevents_p_p.h b/src/quick/items/qquickevents_p_p.h
index bb6726706d..b5596801b7 100644
--- a/src/quick/items/qquickevents_p_p.h
+++ b/src/quick/items/qquickevents_p_p.h
@@ -428,8 +428,8 @@ public: // helpers for C++ only (during event delivery)
     virtual bool allPointsAccepted() const = 0;
     virtual bool allUpdatedPointsAccepted() const = 0;
     virtual bool allPointsGrabbed() const = 0;
-    bool isAccepted() { return m_event->isAccepted(); }
-    void setAccepted(bool accepted) { m_event->setAccepted(accepted); }
+    bool isAccepted() { return m_event ? m_event->isAccepted() : false; }
+    void setAccepted(bool accepted) { if (m_event) m_event->setAccepted(accepted); }
     QVector<QPointF> unacceptedPressedPointScenePositions() const;
 
     virtual int pointCount() const = 0;
@@ -439,7 +439,7 @@ public: // helpers for C++ only (during event delivery)
     virtual void clearGrabbers() const = 0;
     virtual bool hasExclusiveGrabber(const QQuickPointerHandler *handler) const = 0;
 
-    ulong timestamp() const { return m_event->timestamp(); }
+    ulong timestamp() const { return m_event ? m_event->timestamp() : 0; }
 
 protected:
     QQuickPointerDevice *m_device;