michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 
michael@0: #ifndef nsContentAreaDragDrop_h__
michael@0: #define nsContentAreaDragDrop_h__
michael@0: 
michael@0: 
michael@0: #include "nsCOMPtr.h"
michael@0: 
michael@0: #include "nsIDOMEventListener.h"
michael@0: #include "nsITransferable.h"
michael@0: 
michael@0: class nsIDOMNode;
michael@0: class nsPIDOMWindow;
michael@0: class nsIDOMDragEvent;
michael@0: class nsISelection;
michael@0: class nsITransferable;
michael@0: class nsIContent;
michael@0: class nsIURI;
michael@0: class nsIFile;
michael@0: class nsISimpleEnumerator;
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: class DataTransfer;
michael@0: }
michael@0: }
michael@0: 
michael@0: //
michael@0: // class nsContentAreaDragDrop, used to generate the dragdata
michael@0: //
michael@0: class nsContentAreaDragDrop
michael@0: {
michael@0: public:
michael@0: 
michael@0:   /**
michael@0:    * Determine what data in the content area, if any, is being dragged.
michael@0:    *
michael@0:    * aWindow - the window containing the target node
michael@0:    * aTarget - the mousedown event target that started the drag
michael@0:    * aSelectionTargetNode - the node where the drag event should be fired
michael@0:    * aIsAltKeyPressed - true if the Alt key is pressed. In some cases, this
michael@0:    *                    will prevent the drag from occuring. For example,
michael@0:    *                    holding down Alt over a link should select the text,
michael@0:    *                    not drag the link.
michael@0:    * aDataTransfer - the dataTransfer for the drag event.
michael@0:    * aCanDrag - [out] set to true if the drag may proceed, false to stop the
michael@0:    *            drag entirely
michael@0:    * aSelection - [out] set to the selection being dragged, or null if no
michael@0:    *                    selection is being dragged.
michael@0:    * aDragNode - [out] the link, image or area being dragged, or null if the
michael@0:    *             drag occurred on another element.
michael@0:    */
michael@0:   static nsresult GetDragData(nsPIDOMWindow* aWindow,
michael@0:                               nsIContent* aTarget,
michael@0:                               nsIContent* aSelectionTargetNode,
michael@0:                               bool aIsAltKeyPressed,
michael@0:                               mozilla::dom::DataTransfer* aDataTransfer,
michael@0:                               bool* aCanDrag,
michael@0:                               nsISelection** aSelection,
michael@0:                               nsIContent** aDragNode);
michael@0: };
michael@0: 
michael@0: // this is used to save images to disk lazily when the image data is asked for
michael@0: // during the drop instead of when it is added to the drag data transfer. This
michael@0: // ensures that the image data is only created when an image drop is allowed.
michael@0: class nsContentAreaDragDropDataProvider : public nsIFlavorDataProvider
michael@0: {
michael@0: public:
michael@0:   NS_DECL_ISUPPORTS
michael@0:   NS_DECL_NSIFLAVORDATAPROVIDER
michael@0: 
michael@0:   virtual ~nsContentAreaDragDropDataProvider() {}
michael@0: 
michael@0:   nsresult SaveURIToFile(nsAString& inSourceURIString,
michael@0:                          nsIFile* inDestFile, bool isPrivate);
michael@0: };
michael@0: 
michael@0: 
michael@0: #endif /* nsContentAreaDragDrop_h__ */
michael@0: