1 files changed, 27 insertions, 1 deletions
diff --git a/src/quick/handlers/qquickpointerhandler_p.h b/src/quick/handlers/qquickpointerhandler_p.h
index 24a058275d..9a77dd714a 100644
--- a/src/quick/handlers/qquickpointerhandler_p.h
+++ b/src/quick/handlers/qquickpointerhandler_p.h
@@ -67,11 +67,27 @@ class Q_QUICK_PRIVATE_EXPORT QQuickPointerHandler : public QObject
     Q_PROPERTY(bool active READ active NOTIFY activeChanged)
     Q_PROPERTY(QQuickItem * target READ target WRITE setTarget NOTIFY targetChanged)
     Q_PROPERTY(QQuickItem * parent READ parentItem CONSTANT)
+    Q_PROPERTY(GrabPermissions grabPermissions READ grabPermissions WRITE setGrabPermissions NOTIFY grabPermissionChanged)
 
 public:
     explicit QQuickPointerHandler(QObject *parent = 0);
     virtual ~QQuickPointerHandler();
 
+    enum GrabPermission {
+        TakeOverForbidden = 0x0,
+        CanTakeOverFromHandlersOfSameType = 0x01,
+        CanTakeOverFromHandlersOfDifferentType= 0x02,
+        CanTakeOverFromItems = 0x04,
+        CanTakeOverFromAnything = 0x0F,
+        ApprovesTakeOverByHandlersOfSameType = 0x10,
+        ApprovesTakeOverByHandlersOfDifferentType= 0x20,
+        ApprovesTakeOverByItems = 0x40,
+        ApprovesCancellation = 0x80,
+        ApprovesTakeOverByAnything = 0xF0
+    };
+    Q_DECLARE_FLAGS(GrabPermissions, GrabPermission)
+    Q_FLAG(GrabPermissions)
+
 public:
     bool enabled() const { return m_enabled; }
     void setEnabled(bool enabled);
@@ -85,11 +101,15 @@ public:
 
     void handlePointerEvent(QQuickPointerEvent *event);
 
+    GrabPermissions grabPermissions() const { return static_cast<GrabPermissions>(m_grabPermissions); }
+    void setGrabPermissions(GrabPermissions grabPermissions);
+
 Q_SIGNALS:
     void enabledChanged();
     void activeChanged();
     void targetChanged();
     void grabChanged(QQuickEventPoint *point);
+    void grabPermissionChanged();
     void canceled(QQuickEventPoint *point);
 
 protected:
@@ -99,8 +119,10 @@ protected:
     void setActive(bool active);
     virtual void onActiveChanged() { }
     virtual void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabState stateChange, QQuickEventPoint *point);
+    virtual bool canGrab(QQuickEventPoint *point);
+    virtual bool approveGrabTransition(QQuickEventPoint *point, QObject *proposedGrabber);
     void setPassiveGrab(QQuickEventPoint *point, bool grab = true);
-    void setExclusiveGrab(QQuickEventPoint *point, bool grab = true);
+    bool setExclusiveGrab(QQuickEventPoint *point, bool grab = true);
     void cancelAllGrabs(QQuickEventPoint *point);
     QPointF eventPos(const QQuickEventPoint *point) const;
     bool parentContains(const QQuickEventPoint *point) const;
@@ -113,11 +135,15 @@ private:
     bool m_targetExplicitlySet : 1;
     bool m_hadKeepMouseGrab : 1;    // some handlers override target()->setKeepMouseGrab(); this remembers previous state
     bool m_hadKeepTouchGrab : 1;    // some handlers override target()->setKeepTouchGrab(); this remembers previous state
+    uint m_reserved : 19;
+    uint8_t m_grabPermissions : 8;
 
     friend class QQuickEventPoint;
     friend class QQuickWindowPrivate;
 };
 
+Q_DECLARE_OPERATORS_FOR_FLAGS(QQuickPointerHandler::GrabPermissions)
+
 QT_END_NAMESPACE
 
 QML_DECLARE_TYPE(QQuickPointerHandler)