QQuickPointerHandler: add virtual onTargetChanged()

To be overridden in handlers which need to know when this happens,
to avoid connecting to the targetChanged() signal.

Change-Id: I51432b69d05fd541eb62e0cd01f4019e336816ac
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

2 files changed, 3 insertions, 0 deletions

diff --git a/src/quick/handlers/qquickpointerhandler.cpp b/src/quick/handlers/qquickpointerhandler.cpp
index 64bf1a8a8b..d6d3a52d95 100644
--- a/src/quick/handlers/qquickpointerhandler.cpp
+++ b/src/quick/handlers/qquickpointerhandler.cpp
@@ -331,7 +331,9 @@ void QQuickPointerHandler::setTarget(QQuickItem *target)
     if (m_target == target)
         return;
 
+    QQuickItem *oldTarget = m_target;
     m_target = target;
+    onTargetChanged(oldTarget);
     emit targetChanged();
 }
 
diff --git a/src/quick/handlers/qquickpointerhandler_p.h b/src/quick/handlers/qquickpointerhandler_p.h
index 9a77dd714a..a601d8a0f6 100644
--- a/src/quick/handlers/qquickpointerhandler_p.h
+++ b/src/quick/handlers/qquickpointerhandler_p.h
@@ -117,6 +117,7 @@ protected:
     virtual bool wantsPointerEvent(QQuickPointerEvent *event);
     virtual void handlePointerEventImpl(QQuickPointerEvent *event);
     void setActive(bool active);
+    virtual void onTargetChanged(QQuickItem *oldTarget) { Q_UNUSED(oldTarget); }
     virtual void onActiveChanged() { }
     virtual void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabState stateChange, QQuickEventPoint *point);
     virtual bool canGrab(QQuickEventPoint *point);