Crash fix, when the Object will be deleted during handling a QGestureEvent.

The QGestures will now not be deleted immediatly. QGestureManager waits until all
QGestureEvents are processed and will delete the QGestures afterwards.

Task: QT-4022
Reviewed By: Zeno Albisser

2 files changed, 9 insertions, 2 deletions

diff --git a/src/gui/kernel/qgesturemanager.cpp b/src/gui/kernel/qgesturemanager.cpp
index 5e9a0cb..9519447 100644
--- a/src/gui/kernel/qgesturemanager.cpp
+++ b/src/gui/kernel/qgesturemanager.cpp
@@ -175,9 +175,9 @@ void QGestureManager::cleanupCachedGestures(QObject *target, Qt::GestureType typ
                 m_activeGestures.remove(g);
                 m_gestureOwners.remove(g);
                 m_gestureTargets.remove(g);
+                m_gesturesToDelete.insert(g);
             }
 
-            qDeleteAll(gestures);
             iter = m_objectGestures.erase(iter);
         } else {
             ++iter;
@@ -385,6 +385,11 @@ bool QGestureManager::filterEventThroughContexts(const QMultiMap<QObject *,
         recycle(gesture);
         m_gestureTargets.remove(gesture);
     }
+
+    //Clean up the Gestures
+    qDeleteAll(m_gesturesToDelete);
+    m_gesturesToDelete.clear();
+
     return ret;
 }
 
@@ -447,7 +452,8 @@ void QGestureManager::cancelGesturesForChildren(QGesture *original)
 void QGestureManager::cleanupGesturesForRemovedRecognizer(QGesture *gesture)
 {
     QGestureRecognizer *recognizer = m_deletedRecognizers.value(gesture);
-    Q_ASSERT(recognizer);
+    if(!recognizer) //The Gesture is removed while in the even loop, so the recognizers for this gestures was removed
+        return;
     m_deletedRecognizers.remove(gesture);
     if (m_deletedRecognizers.keys(recognizer).isEmpty()) {
         // no more active gestures, cleanup!
diff --git a/src/gui/kernel/qgesturemanager_p.h b/src/gui/kernel/qgesturemanager_p.h
index 0d84b67..a5a3482 100644
--- a/src/gui/kernel/qgesturemanager_p.h
+++ b/src/gui/kernel/qgesturemanager_p.h
@@ -130,6 +130,7 @@ private:
 
     QHash<QGestureRecognizer *, QSet<QGesture *> > m_obsoleteGestures;
     QHash<QGesture *, QGestureRecognizer *> m_deletedRecognizers;
+    QSet<QGesture *> m_gesturesToDelete;
     void cleanupGesturesForRemovedRecognizer(QGesture *gesture);
 
     QGesture *getState(QObject *widget, QGestureRecognizer *recognizer,