diff -r 000000000000 -r 6474c204b198 widget/windows/nsNativeDragSource.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/windows/nsNativeDragSource.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,66 @@
+/* -*- 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 _nsNativeDragSource_h_
+#define _nsNativeDragSource_h_
+
+#include "nscore.h"
+#include "nsIDOMDataTransfer.h"
+#include "nsCOMPtr.h"
+#include <ole2.h>
+#include <oleidl.h>
+#include "mozilla/Attributes.h"
+
+//class nsIDragSource;
+
+/*
+ * nsNativeDragSource implements the IDropSource interface and gets
+ * most of its behavior from the associated adapter (m_dragDrop).
+ */
+class nsNativeDragSource MOZ_FINAL : public IDropSource
+{
+public:
+
+  // construct an nsNativeDragSource referencing adapter
+  // nsNativeDragSource(nsIDragSource * adapter);
+  nsNativeDragSource(nsIDOMDataTransfer* aDataTransfer);
+  ~nsNativeDragSource();
+
+  // IUnknown methods - see iunknown.h for documentation
+
+  STDMETHODIMP QueryInterface(REFIID, void**);
+  STDMETHODIMP_(ULONG) AddRef();
+  STDMETHODIMP_(ULONG) Release();
+
+  // IDropSource methods - see idropsrc.h for documentation
+
+  // Return DRAGDROP_S_USEDEFAULTCURSORS if this object lets OLE provide
+  // default cursors, otherwise return NOERROR. This method gets called in
+  // response to changes that the target makes to dEffect (DragEnter,
+  // DragOver).
+  STDMETHODIMP GiveFeedback(DWORD dEffect);
+
+  // This method gets called if there is any change in the mouse or key
+  // state.  Return DRAGDROP_S_CANCEL to stop the drag, DRAGDROP_S_DROP
+  // to execute the drop, otherwise NOERROR.
+  STDMETHODIMP QueryContinueDrag(BOOL fESC, DWORD grfKeyState);
+
+  bool UserCancelled() { return mUserCancelled; }
+
+protected:
+  // Reference count
+  ULONG m_cRef;
+
+  // Data object, hold information about cursor state
+  nsCOMPtr<nsIDOMDataTransfer> mDataTransfer;
+
+  // Custom drag cursor
+  HCURSOR m_hCursor;
+
+  // true if the user cancelled the drag by pressing escape
+  bool mUserCancelled;
+};
+
+#endif // _nsNativeDragSource_h_
+