Propagate event accepted state to platform plugins

Add en "eventAccepted" field to WindowSystemEvent,
where the event subclasses can record the event
acceptance status. Make handleWindowSystemEvent()
return the accepted status.

This works for synchronous event processing only. If
the event is placed on the QPA event queue then there
is no way to return the accepted state immediately.
In the latter case handleWindowSystemEvent() always
returns "true".

Change-Id: I081aecc54f43588d42d3aaeec7f8458f06937601
Reviewed-by: Jørgen Lind <jorgen.lind@theqtcompany.com>

2 files changed, 7 insertions, 3 deletions

diff --git a/src/gui/kernel/qwindowsysteminterface.cpp b/src/gui/kernel/qwindowsysteminterface.cpp
index 3ab2f59661..8c429150a8 100644
--- a/src/gui/kernel/qwindowsysteminterface.cpp
+++ b/src/gui/kernel/qwindowsysteminterface.cpp
@@ -441,10 +441,12 @@ void QWindowSystemInterfacePrivate::removeWindowSystemEvent(WindowSystemEvent *e
     windowSystemEventQueue.remove(event);
 }
 
-void QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *ev)
+bool QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *ev)
 {
+    bool accepted = true;
     if (synchronousWindowSystemEvents) {
         QGuiApplicationPrivate::processWindowSystemEvent(ev);
+        accepted = ev->eventAccepted;
         delete ev;
     } else {
         windowSystemEventQueue.append(ev);
@@ -452,6 +454,7 @@ void QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfa
         if (dispatcher)
             dispatcher->wakeUp();
     }
+    return accepted;
 }
 
 void QWindowSystemInterface::registerTouchDevice(QTouchDevice *device)
diff --git a/src/gui/kernel/qwindowsysteminterface_p.h b/src/gui/kernel/qwindowsysteminterface_p.h
index cbc3bad7cd..cc0ca6bf81 100644
--- a/src/gui/kernel/qwindowsysteminterface_p.h
+++ b/src/gui/kernel/qwindowsysteminterface_p.h
@@ -101,7 +101,7 @@ public:
         };
 
         explicit WindowSystemEvent(EventType t)
-            : type(t), flags(0) { }
+            : type(t), flags(0), eventAccepted(true) { }
         virtual ~WindowSystemEvent() { }
 
         bool synthetic() const  { return flags & Synthetic; }
@@ -109,6 +109,7 @@ public:
 
         EventType type;
         int flags;
+        bool eventAccepted;
     };
 
     class CloseEvent : public WindowSystemEvent {
@@ -480,7 +481,7 @@ public:
     static WindowSystemEvent *getNonUserInputWindowSystemEvent();
     static WindowSystemEvent *peekWindowSystemEvent(EventType t);
     static void removeWindowSystemEvent(WindowSystemEvent *event);
-    static void handleWindowSystemEvent(WindowSystemEvent *ev);
+    static bool handleWindowSystemEvent(WindowSystemEvent *ev);
 
     static QElapsedTimer eventTime;
     static bool synchronousWindowSystemEvents;