Refactor the QPA dnd interface.

- Give QPlatformDrag a synchronous drag() function returning
  the Qt::DropAction
- Move the base functionality for asynchronous event handling
  to the platformsupport library as QBasicDrag (extendable base class
  handling drag icon and providing new virtuals)  and QSimpleDrag
  (sample implementation for drag within the Qt application).
- Change the Windows implementation accordingly.
- Change XCB to be based on QBasicDrag.
- Clean up QDragManager.

Change-Id: I654f76f0e55a385ba189bd74f3ceaded6a8fe318
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/gui/kernel/qwindowsysteminterface_qpa.h b/src/gui/kernel/qwindowsysteminterface_qpa.h
index 836fb40bd7..6dae11ea81 100644
--- a/src/gui/kernel/qwindowsysteminterface_qpa.h
+++ b/src/gui/kernel/qwindowsysteminterface_qpa.h
@@ -59,6 +59,8 @@ QT_BEGIN_NAMESPACE
 
 class QMimeData;
 class QTouchDevice;
+class QPlatformDragQtResponse;
+class QPlatformDropQtResponse;
 
 
 class Q_GUI_EXPORT QWindowSystemInterface
@@ -122,8 +124,8 @@ public:
     static void handleSynchronousExposeEvent(QWindow *tlw, const QRegion &region);
 
     // Drag and drop. These events are sent immediately.
-    static Qt::DropAction handleDrag(QWindow *w, QMimeData *dropData, const QPoint &p);
-    static Qt::DropAction handleDrop(QWindow *w, QMimeData *dropData, const QPoint &p);
+    static QPlatformDragQtResponse handleDrag(QWindow *w, const QMimeData *dropData, const QPoint &p, Qt::DropActions supportedActions);
+    static QPlatformDropQtResponse handleDrop(QWindow *w, const QMimeData *dropData, const QPoint &p, Qt::DropActions supportedActions);
 
     static bool handleNativeEvent(QWindow *window, const QByteArray &eventType, void *message, long *result);