diff -r 000000000000 -r 6474c204b198 widget/windows/nsNativeDragTarget.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/windows/nsNativeDragTarget.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef _nsNativeDragTarget_h_
+#define _nsNativeDragTarget_h_
+
+#include "nsCOMPtr.h"
+#include "nsIDragSession.h"
+#include <ole2.h>
+#include <shlobj.h>
+
+#ifndef IDropTargetHelper
+#include <shobjidl.h> // Vista drag image interfaces
+#undef LogSeverity // SetupAPI.h #defines this as DWORD
+#endif
+
+#include "mozilla/Attributes.h"
+
+class nsIDragService;
+class nsIWidget;
+
+struct IDataObject;
+
+/*
+ * nsNativeDragTarget implements the IDropTarget interface and gets most of its
+ * behavior from the associated adapter (m_dragDrop).
+ */
+
+class nsNativeDragTarget MOZ_FINAL : public IDropTarget
+{
+public:
+  nsNativeDragTarget(nsIWidget * aWidget);
+  ~nsNativeDragTarget();
+
+  // IUnknown members - see iunknown.h for documentation
+  STDMETHODIMP QueryInterface(REFIID, void**);
+  STDMETHODIMP_(ULONG) AddRef();
+  STDMETHODIMP_(ULONG) Release();
+
+  // IDataTarget members
+
+  // Set pEffect based on whether this object can support a drop based on
+  // the data available from pSource, the key and mouse states specified
+  // in grfKeyState, and the coordinates specified by point. This is
+  // called by OLE when a drag enters this object's window (as registered
+  // by Initialize).
+  STDMETHODIMP DragEnter(LPDATAOBJECT pSource, DWORD grfKeyState,
+                         POINTL point, DWORD* pEffect);
+
+  // Similar to DragEnter except it is called frequently while the drag
+  // is over this object's window.
+  STDMETHODIMP DragOver(DWORD grfKeyState, POINTL point, DWORD* pEffect);
+
+  // Release the drag-drop source and put internal state back to the point
+  // before the call to DragEnter. This is called when the drag leaves
+  // without a drop occurring.
+  STDMETHODIMP DragLeave();
+
+  // If point is within our region of interest and pSource's data supports
+  // one of our formats, get the data and set pEffect according to
+  // grfKeyState (DROPEFFECT_MOVE if the control key was not pressed,
+  // DROPEFFECT_COPY if the control key was pressed). Otherwise return
+  // E_FAIL.
+  STDMETHODIMP Drop(LPDATAOBJECT pSource, DWORD grfKeyState,
+                    POINTL point, DWORD* pEffect);
+  /**
+   * Cancel the current drag session, if any.
+   */
+  void DragCancel();
+
+protected:
+
+  void GetGeckoDragAction(DWORD grfKeyState, LPDWORD pdwEffect, 
+                          uint32_t * aGeckoAction);
+  void ProcessDrag(uint32_t aEventType, DWORD grfKeyState,
+                   POINTL pt, DWORD* pdwEffect);
+  void DispatchDragDropEvent(uint32_t aType, POINTL pt);
+  void AddLinkSupportIfCanBeGenerated(LPDATAOBJECT aIDataSource);
+
+  // Native Stuff
+  ULONG            m_cRef;      // reference count
+  HWND             mHWnd;
+  DWORD            mEffectsAllowed;
+  DWORD            mEffectsPreferred;
+  bool             mTookOwnRef;
+
+  // Gecko Stuff
+  nsIWidget      * mWidget;
+  nsIDragService * mDragService;
+  // Drag target helper 
+  IDropTargetHelper * GetDropTargetHelper();
+
+
+private:
+  // Drag target helper 
+  IDropTargetHelper * mDropTargetHelper;
+};
+
+#endif // _nsNativeDragTarget_h_
+
+