Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIDnDHandler.h
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIDnDHandler.h	(revision 42273)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIDnDHandler.h	(revision 42273)
@@ -0,0 +1,70 @@
+/** @file
+ *
+ * VBox frontends: Qt GUI ("VirtualBox"):
+ * UIDnDHandler class declaration
+ */
+
+/*
+ * Copyright (C) 2011 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+#ifndef ___UIDnDHandler_h___
+#define ___UIDnDHandler_h___
+
+/* COM includes: */
+#include "COMEnums.h"
+
+/* Forward declarations: */
+class QMimeData;
+class CSession;
+class CGuest;
+
+/* Todo: check for making this a full static class when possible. */
+class UIDnDHandler: public QObject
+{
+public:
+    /* Singleton */
+    static UIDnDHandler* instance()
+    {
+        if (!m_pInstance)
+            m_pInstance = new UIDnDHandler();
+        return m_pInstance;
+    }
+    static void destroy() { delete m_pInstance; m_pInstance = 0; }
+
+    /* Host -> Guest */
+    Qt::DropAction dragHGEnter(CGuest &guest, ulong screenId, int x, int y, Qt::DropAction proposedAction, Qt::DropActions possibleActions, const QMimeData *pMimeData, QWidget *pParent = 0);
+    Qt::DropAction dragHGMove (CGuest &guest, ulong screenId, int x, int y, Qt::DropAction proposedAction, Qt::DropActions possibleActions, const QMimeData *pMimeData, QWidget *pParent = 0);
+    Qt::DropAction dragHGDrop (CGuest &guest, ulong screenId, int x, int y, Qt::DropAction proposedAction, Qt::DropActions possibleActions, const QMimeData *pMimeData, QWidget *pParent = 0);
+    void           dragHGLeave(CGuest &guest, ulong screenId, QWidget *pParent = 0);
+
+    /* Guest -> Host */
+    void           dragGHPending(CSession &session, ulong screenId, QWidget *pParent = 0);
+
+private:
+    static UIDnDHandler *m_pInstance;
+
+    UIDnDHandler();
+    ~UIDnDHandler() {}
+
+    /* Private helpers */
+    static KDragAndDropAction          toVBoxDnDAction(Qt::DropAction action);
+    static QVector<KDragAndDropAction> toVBoxDnDActions(Qt::DropActions actions);
+    static Qt::DropAction              toQtDnDAction(KDragAndDropAction action);
+    static Qt::DropActions             toQtDnDActions(const QVector<KDragAndDropAction> &actions);
+
+    friend class UIDnDMimeData;
+};
+
+#define gDnD UIDnDHandler::instance()
+
+#endif /* ___UIDnDHandler_h___ */
+