author Justin Dolske <dolske@mozilla.com>
Wed, 13 May 2015 20:44:52 -0700
changeset 260488 89ef57a1733a31097d3f10c15f1989c3b761edbd
parent 238421 41c37790896e424e2743811d3d19be00068ce941
child 269546 55524bdeb708cca0f7b128fbe3e1e58cbece899d
permissions -rw-r--r--
Bug 1164253 - Save request is sent twice for every button press. r=jaws a=dolske

/* -*- 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

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

  typedef mozilla::gfx::SourceSurface SourceSurface;



  //nsIDragSession and nsIDragService

  void SetDragEndPoint(nsIntPoint aEndDragPoint) { mEndDragPoint = aEndDragPoint; }

  uint16_t GetInputSource() { return mInputSource; }

  virtual ~nsBaseDragService();

   * 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.
  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__