dom/base/nsContentAreaDragDrop.h
author ffxbld
Fri, 26 May 2017 08:16:53 -0700
changeset 360774 43b0fdd5b94a28a6b8f4da567b9e6af46a6b5d8e
parent 282426 e22b3043887ed36bf2c634c2924a7c8d39d226b1
child 403082 fc5cbc7e0d7ff28ed81f802a4973e2e8634cfe61
permissions -rw-r--r--
No bug, Automated blocklist update from host bld-linux64-spot-301 - a=blocklist-update

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 nsContentAreaDragDrop_h__
#define nsContentAreaDragDrop_h__


#include "nsCOMPtr.h"

#include "nsIDOMEventListener.h"
#include "nsITransferable.h"

class nsPIDOMWindowOuter;
class nsISelection;
class nsITransferable;
class nsIContent;
class nsIFile;

namespace mozilla {
namespace dom {
class DataTransfer;
} // namespace dom
} // namespace mozilla

//
// class nsContentAreaDragDrop, used to generate the dragdata
//
class nsContentAreaDragDrop
{
public:

  /**
   * Determine what data in the content area, if any, is being dragged.
   *
   * aWindow - the window containing the target node
   * aTarget - the mousedown event target that started the drag
   * aSelectionTargetNode - the node where the drag event should be fired
   * aIsAltKeyPressed - true if the Alt key is pressed. In some cases, this
   *                    will prevent the drag from occuring. For example,
   *                    holding down Alt over a link should select the text,
   *                    not drag the link.
   * aDataTransfer - the dataTransfer for the drag event.
   * aCanDrag - [out] set to true if the drag may proceed, false to stop the
   *            drag entirely
   * aSelection - [out] set to the selection being dragged, or null if no
   *                    selection is being dragged.
   * aDragNode - [out] the link, image or area being dragged, or null if the
   *             drag occurred on another element.
   */
  static nsresult GetDragData(nsPIDOMWindowOuter* aWindow,
                              nsIContent* aTarget,
                              nsIContent* aSelectionTargetNode,
                              bool aIsAltKeyPressed,
                              mozilla::dom::DataTransfer* aDataTransfer,
                              bool* aCanDrag,
                              nsISelection** aSelection,
                              nsIContent** aDragNode);
};

// this is used to save images to disk lazily when the image data is asked for
// during the drop instead of when it is added to the drag data transfer. This
// ensures that the image data is only created when an image drop is allowed.
class nsContentAreaDragDropDataProvider : public nsIFlavorDataProvider
{
  virtual ~nsContentAreaDragDropDataProvider() {}

public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIFLAVORDATAPROVIDER

  nsresult SaveURIToFile(nsAString& inSourceURIString,
                         nsIFile* inDestFile, bool isPrivate);
};


#endif /* nsContentAreaDragDrop_h__ */