From 92d8b0e1d6ecce8214b24a08b8a199af4321bd88 Mon Sep 17 00:00:00 2001
From: Thomas Zander <thomas.zander@trolltech.com>
Date: Wed, 21 Oct 2009 12:40:59 +0200
Subject: Implement QApplication::unregisterGestureRecognizer

Reviewed-by: Denis Dzyubenko
---
 src/gui/kernel/qapplication.cpp    |  4 +++-
 src/gui/kernel/qgesturemanager.cpp | 42 +++++++++++++++++++++++++++++++++++---
 src/gui/kernel/qgesturemanager_p.h |  9 ++++++--
 3 files changed, 49 insertions(+), 6 deletions(-)

diff --git a/src/gui/kernel/qapplication.cpp b/src/gui/kernel/qapplication.cpp
index 202d450..e64dfd2 100644
--- a/src/gui/kernel/qapplication.cpp
+++ b/src/gui/kernel/qapplication.cpp
@@ -5642,7 +5642,9 @@ Qt::GestureType QApplication::registerGestureRecognizer(QGestureRecognizer *reco
 */
 void QApplication::unregisterGestureRecognizer(Qt::GestureType type)
 {
-    QGestureManager::instance()->unregisterGestureRecognizer(type);
+    QApplicationPrivate *d = qApp->d_func();
+    if (d->gestureManager)
+        d->gestureManager->unregisterGestureRecognizer(type);
 }
 
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qgesturemanager.cpp b/src/gui/kernel/qgesturemanager.cpp
index 0601457..dc76c3f 100644
--- a/src/gui/kernel/qgesturemanager.cpp
+++ b/src/gui/kernel/qgesturemanager.cpp
@@ -104,9 +104,29 @@ Qt::GestureType QGestureManager::registerGestureRecognizer(QGestureRecognizer *r
     return type;
 }
 
-void QGestureManager::unregisterGestureRecognizer(Qt::GestureType)
+void QGestureManager::unregisterGestureRecognizer(Qt::GestureType type)
 {
+    QList<QGestureRecognizer *> list = recognizers.values(type);
+    recognizers.remove(type);
+    foreach (QGesture* g, gestureToRecognizer.keys()) {
+        QGestureRecognizer *recognizer = gestureToRecognizer.value(g);
+        if (list.contains(recognizer)) {
+            m_deletedRecognizers.insert(g, recognizer);
+            gestureToRecognizer.remove(g);
+        }
+    }
 
+    foreach (QGestureRecognizer *recognizer, list) {
+        QList<QGesture *> obsoleteGestures;
+        QMap<ObjectGesture, QGesture *>::Iterator iter = objectGestures.begin();
+        while (iter != objectGestures.end()) {
+            ObjectGesture objectGesture = iter.key();
+            if (objectGesture.gesture == type)
+                obsoleteGestures << iter.value();
+            ++iter;
+        }
+        m_obsoleteGestures.insert(recognizer, obsoleteGestures);
+    }
 }
 
 QGesture *QGestureManager::getState(QObject *object, Qt::GestureType type)
@@ -290,14 +310,28 @@ bool QGestureManager::filterEventThroughContexts(const QMap<QObject *,
     QSet<QGesture *> endedGestures =
             finishedGestures + canceledGestures + undeliveredGestures;
     foreach (QGesture *gesture, endedGestures) {
-        if (QGestureRecognizer *recognizer = gestureToRecognizer.value(gesture, 0)) {
+        if (QGestureRecognizer *recognizer = gestureToRecognizer.value(gesture, 0))
             recognizer->reset(gesture);
-        }
+        else
+            cleanupGesturesForRemovedRecognizer(gesture);
         gestureTargets.remove(gesture);
     }
     return false;
 }
 
+void QGestureManager::cleanupGesturesForRemovedRecognizer(QGesture *gesture)
+{
+    QGestureRecognizer *recognizer = m_deletedRecognizers.value(gesture);
+    Q_ASSERT(recognizer);
+    m_deletedRecognizers.remove(gesture);
+    if (m_deletedRecognizers.keys(recognizer).isEmpty()) {
+        // no more active gestures, cleanup!
+        qDeleteAll(m_obsoleteGestures.value(recognizer));
+        m_obsoleteGestures.remove(recognizer);
+        delete recognizer;
+    }
+}
+
 bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event)
 {
     QSet<Qt::GestureType> types;
@@ -534,6 +568,8 @@ void QGestureManager::timerEvent(QTimerEvent *event)
             QGestureRecognizer *recognizer = gestureToRecognizer.value(gesture, 0);
             if (recognizer)
                 recognizer->reset(gesture);
+            else
+                cleanupGesturesForRemovedRecognizer(gesture);
         } else {
             ++it;
         }
diff --git a/src/gui/kernel/qgesturemanager_p.h b/src/gui/kernel/qgesturemanager_p.h
index f0e7225..eef45d2 100644
--- a/src/gui/kernel/qgesturemanager_p.h
+++ b/src/gui/kernel/qgesturemanager_p.h
@@ -104,7 +104,7 @@ private:
         Qt::GestureType gesture;
 
         ObjectGesture(QObject *o, const Qt::GestureType &g) : object(o), gesture(g) { }
-        inline bool operator<(const ObjectGesture& rhs) const
+        inline bool operator<(const ObjectGesture &rhs) const
         {
             if (object.data() < rhs.object.data())
                 return true;
@@ -114,7 +114,8 @@ private:
         }
     };
 
-    QMap<ObjectGesture, QGesture *> objectGestures;
+    // TODO rename all member vars to be m_
+    QMap<ObjectGesture, QGesture *> objectGestures; // TODO rename widgetGestures
     QMap<QGesture *, QGestureRecognizer *> gestureToRecognizer;
     QHash<QGesture *, QObject *> gestureOwners;
 
@@ -122,6 +123,10 @@ private:
 
     int lastCustomGestureId;
 
+    QHash<QGestureRecognizer *, QList<QGesture *> > m_obsoleteGestures;
+    QMap<QGesture *, QGestureRecognizer *> m_deletedRecognizers;
+    void cleanupGesturesForRemovedRecognizer(QGesture *gesture);
+
     QGesture *getState(QObject *widget, Qt::GestureType gesture);
     void deliverEvents(const QSet<QGesture *> &gestures,
                        QSet<QGesture *> *undeliveredGestures);
-- 
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