QML: re-use event objects across signal emissions.

This change creates a single key/mouse/wheel event for use in signals,
and re-uses that event across emissions. This prevents allocating a new
event (and it's QObjectPrivate data) for every key press / mouse move /
wheel spin.

Change-Id: I395f6ce3ed8588157e4175c8481351b330793fac
Reviewed-by: Robin Burchell <robin.burchell@viroteck.net>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/quick/items/qquickitem_p.h b/src/quick/items/qquickitem_p.h
index 854cbd769b..561f922ed7 100644
--- a/src/quick/items/qquickitem_p.h
+++ b/src/quick/items/qquickitem_p.h
@@ -56,6 +56,7 @@
 #include "qquickanchors_p.h"
 #include "qquickanchors_p_p.h"
 #include "qquickitemchangelistener_p.h"
+#include "qquickevents_p_p.h"
 
 #include "qquickwindow_p.h"
 
@@ -778,6 +779,7 @@ public:
     QQuickItem *imeItem;
     QList<QQuickItem *> targets;
     QQuickItem *item;
+    QQuickKeyEvent theKeyEvent;
 };
 
 class QQuickKeysAttached : public QObject, public QQuickItemKeyFilter