diff -r 000000000000 -r 6474c204b198 widget/xpwidgets/nsBaseDragService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/xpwidgets/nsBaseDragService.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,158 @@
+/* -*- 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 nsBaseDragService_h__
+#define nsBaseDragService_h__
+
+#include "nsIDragService.h"
+#include "nsIDragSession.h"
+#include "nsITransferable.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMDataTransfer.h"
+#include "nsCOMPtr.h"
+#include "nsRect.h"
+#include "nsPoint.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/HTMLCanvasElement.h"
+
+// translucency level for drag images
+#define DRAG_TRANSLUCENCY 0.65
+
+class nsIContent;
+class nsIDOMNode;
+class nsIFrame;
+class nsPresContext;
+class nsIImageLoadingContent;
+class nsICanvasElementExternal;
+
+namespace mozilla {
+namespace gfx {
+class SourceSurface;
+}
+}
+
+/**
+ * XP DragService wrapper base class
+ */
+
+class nsBaseDragService : public nsIDragService,
+                          public nsIDragSession
+{
+
+public:
+  typedef mozilla::gfx::SourceSurface SourceSurface;
+
+  nsBaseDragService();
+  virtual ~nsBaseDragService();
+
+  //nsISupports
+  NS_DECL_ISUPPORTS
+
+  //nsIDragSession and nsIDragService
+  NS_DECL_NSIDRAGSERVICE
+  NS_DECL_NSIDRAGSESSION
+
+  void SetDragEndPoint(nsIntPoint aEndDragPoint) { mEndDragPoint = aEndDragPoint; }
+
+  uint16_t GetInputSource() { return mInputSource; }
+
+protected:
+
+  /**
+   * Draw the drag image, if any, to a surface and return it. The drag image
+   * is constructed from mImage if specified, or aDOMNode if mImage is null.
+   *
+   * aRegion may be used to draw only a subset of the element. This region
+   * should be supplied using x and y coordinates measured in css pixels
+   * that are relative to the upper-left corner of the window.
+   *
+   * aScreenX and aScreenY should be the screen coordinates of the mouse click
+   * for the drag. These are in global display pixels.
+   *
+   * On return, aScreenDragRect will contain the screen coordinates of the
+   * area being dragged. This is used by the platform-specific part of the
+   * drag service to determine the drag feedback. This rect will be in the
+   * device pixels of the presContext.
+   *
+   * If there is no drag image, the returned surface will be null, but
+   * aScreenDragRect will still be set to the drag area.
+   *
+   * aPresContext will be set to the nsPresContext used determined from
+   * whichever of mImage or aDOMNode is used.
+   */
+  nsresult DrawDrag(nsIDOMNode* aDOMNode,
+                    nsIScriptableRegion* aRegion,
+                    int32_t aScreenX, int32_t aScreenY,
+                    nsIntRect* aScreenDragRect,
+                    mozilla::RefPtr<SourceSurface>* aSurface,
+                    nsPresContext **aPresContext);
+
+  /**
+   * Draw a drag image for an image node specified by aImageLoader or aCanvas.
+   * This is called by DrawDrag.
+   */
+  nsresult DrawDragForImage(nsPresContext* aPresContext,
+                            nsIImageLoadingContent* aImageLoader,
+                            mozilla::dom::HTMLCanvasElement* aCanvas,
+                            int32_t aScreenX, int32_t aScreenY,
+                            nsIntRect* aScreenDragRect,
+                            mozilla::RefPtr<SourceSurface>* aSurface);
+
+  /**
+   * Convert aScreenX and aScreenY from CSS pixels into unscaled device pixels.
+   */
+  void
+  ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
+                             int32_t* aScreenX, int32_t* aScreenY);
+
+  /**
+   * If the drag image is a popup, open the popup when the drag begins.
+   */
+  void OpenDragPopup();
+
+  bool mCanDrop;
+  bool mOnlyChromeDrop;
+  bool mDoingDrag;
+  // true if mImage should be used to set a drag image
+  bool mHasImage;
+  // true if the user cancelled the drag operation
+  bool mUserCancelled;
+
+  uint32_t mDragAction;
+  nsSize mTargetSize;
+  nsCOMPtr<nsIDOMNode> mSourceNode;
+  nsCOMPtr<nsIDOMDocument> mSourceDocument;       // the document at the drag source. will be null
+                                                  //  if it came from outside the app.
+  nsCOMPtr<nsIDOMDataTransfer> mDataTransfer;
+
+  // used to determine the image to appear on the cursor while dragging
+  nsCOMPtr<nsIDOMNode> mImage;
+  // offset of cursor within the image 
+  int32_t mImageX;
+  int32_t mImageY;
+
+  // set if a selection is being dragged
+  nsCOMPtr<nsISelection> mSelection;
+
+  // set if the image in mImage is a popup. If this case, the popup will be opened
+  // and moved instead of using a drag image.
+  nsCOMPtr<nsIContent> mDragPopup;
+
+  // the screen position where drag gesture occurred, used for positioning the
+  // drag image when no image is specified. If a value is -1, no event was
+  // supplied so the screen position is not known
+  int32_t mScreenX;
+  int32_t mScreenY;
+
+  // the screen position where the drag ended
+  nsIntPoint mEndDragPoint;
+
+  uint32_t mSuppressLevel;
+
+  // The input source of the drag event. Possible values are from nsIDOMMouseEvent.
+  uint16_t mInputSource;
+};
+
+#endif // nsBaseDragService_h__