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       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : 
       8             : #ifndef nsContentAreaDragDrop_h__
       9             : #define nsContentAreaDragDrop_h__
      10             : 
      11             : 
      12             : #include "nsCOMPtr.h"
      13             : 
      14             : #include "nsIDOMEventListener.h"
      15             : #include "nsITransferable.h"
      16             : 
      17             : class nsPIDOMWindowOuter;
      18             : class nsISelection;
      19             : class nsITransferable;
      20             : class nsIContent;
      21             : class nsIFile;
      22             : 
      23             : namespace mozilla {
      24             : namespace dom {
      25             : class DataTransfer;
      26             : } // namespace dom
      27             : } // namespace mozilla
      28             : 
      29             : //
      30             : // class nsContentAreaDragDrop, used to generate the dragdata
      31             : //
      32             : class nsContentAreaDragDrop
      33             : {
      34             : public:
      35             : 
      36             :   /**
      37             :    * Determine what data in the content area, if any, is being dragged.
      38             :    *
      39             :    * aWindow - the window containing the target node
      40             :    * aTarget - the mousedown event target that started the drag
      41             :    * aSelectionTargetNode - the node where the drag event should be fired
      42             :    * aIsAltKeyPressed - true if the Alt key is pressed. In some cases, this
      43             :    *                    will prevent the drag from occuring. For example,
      44             :    *                    holding down Alt over a link should select the text,
      45             :    *                    not drag the link.
      46             :    * aDataTransfer - the dataTransfer for the drag event.
      47             :    * aCanDrag - [out] set to true if the drag may proceed, false to stop the
      48             :    *            drag entirely
      49             :    * aSelection - [out] set to the selection being dragged, or null if no
      50             :    *                    selection is being dragged.
      51             :    * aDragNode - [out] the link, image or area being dragged, or null if the
      52             :    *             drag occurred on another element.
      53             :    */
      54             :   static nsresult GetDragData(nsPIDOMWindowOuter* aWindow,
      55             :                               nsIContent* aTarget,
      56             :                               nsIContent* aSelectionTargetNode,
      57             :                               bool aIsAltKeyPressed,
      58             :                               mozilla::dom::DataTransfer* aDataTransfer,
      59             :                               bool* aCanDrag,
      60             :                               nsISelection** aSelection,
      61             :                               nsIContent** aDragNode);
      62             : };
      63             : 
      64             : // this is used to save images to disk lazily when the image data is asked for
      65             : // during the drop instead of when it is added to the drag data transfer. This
      66             : // ensures that the image data is only created when an image drop is allowed.
      67           0 : class nsContentAreaDragDropDataProvider : public nsIFlavorDataProvider
      68             : {
      69           0 :   virtual ~nsContentAreaDragDropDataProvider() {}
      70             : 
      71             : public:
      72             :   NS_DECL_ISUPPORTS
      73             :   NS_DECL_NSIFLAVORDATAPROVIDER
      74             : 
      75             :   nsresult SaveURIToFile(nsAString& inSourceURIString,
      76             :                          nsIFile* inDestFile, bool isPrivate);
      77             : };
      78             : 
      79             : 
      80             : #endif /* nsContentAreaDragDrop_h__ */
      81             :