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nsDragService.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
00002  *
00003  * ***** BEGIN LICENSE BLOCK *****
00004  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00005  *
00006  * The contents of this file are subject to the Mozilla Public License Version
00007  * 1.1 (the "License"); you may not use this file except in compliance with
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00009  * http://www.mozilla.org/MPL/
00010  *
00011  * Software distributed under the License is distributed on an "AS IS" basis,
00012  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00013  * for the specific language governing rights and limitations under the
00014  * License.
00015  *
00016  * The Original Code is mozilla.org code.
00017  *
00018  * The Initial Developer of the Original Code is
00019  * Christopher Blizzard <blizzard@mozilla.org>.
00020  * Portions created by the Initial Developer are Copyright (C) 1998
00021  * the Initial Developer. All Rights Reserved.
00022  *
00023  * Contributor(s):
00024  *   Christopher Blizzard <blizzard@mozilla.org>
00025  *   Peter Hartshorn <peter@igelaus.com.au>
00026  *
00027  * Alternatively, the contents of this file may be used under the terms of
00028  * either the GNU General Public License Version 2 or later (the "GPL"), or
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00039  * ***** END LICENSE BLOCK ***** */
00040 
00041 #ifndef nsDragService_h__
00042 #define nsDragService_h__
00043 
00044 #include "nsBaseDragService.h"
00045 #include "nsIDragService.h"
00046 #include "nsIDragSessionXlib.h"
00047 #include "nsGUIEvent.h"
00048 #include "nsIWidget.h"
00049 #include "nsWidget.h"
00050 
00055 class nsDragService : public nsBaseDragService, public nsIDragSessionXlib
00056 {
00057 
00058 public:
00059 
00060   NS_DECL_ISUPPORTS_INHERITED
00061 
00062   nsDragService();
00063   virtual ~nsDragService();
00064 
00065   // nsIDragService
00066   NS_IMETHOD InvokeDragSession (nsIDOMNode *aDOMNode,
00067                                 nsISupportsArray * anArrayTransferables,
00068                                 nsIScriptableRegion * aRegion,
00069                                 PRUint32 aActionType);
00070   NS_IMETHOD StartDragSession();
00071   NS_IMETHOD EndDragSession();
00072 
00073   // nsIDragSession
00074   NS_IMETHOD GetCurrentSession     (nsIDragSession **aSession);
00075   NS_IMETHOD SetCanDrop            (PRBool           aCanDrop);
00076   NS_IMETHOD GetCanDrop            (PRBool          *aCanDrop);
00077   NS_IMETHOD GetNumDropItems       (PRUint32 * aNumItems);
00078   NS_IMETHOD GetData               (nsITransferable * aTransferable, PRUint32 anItemIndex);
00079   NS_IMETHOD IsDataFlavorSupported (const char *aDataFlavor, PRBool *_retval);
00080 
00081   //nsIDragSessionXlib
00082   NS_IMETHOD IsDragging(PRBool *result);
00083   NS_IMETHOD UpdatePosition(PRInt32 x, PRInt32 y);
00084 
00085 protected:
00086   static nsEventStatus PR_CALLBACK Callback(nsGUIEvent *event);
00087 
00088 private:
00089   static nsWidget *sWidget;
00090   static Window sWindow;
00091   static XlibRgbHandle *sXlibRgbHandle;
00092   static Display *sDisplay;
00093   static PRBool mDragging;
00094   PRBool mCanDrop;
00095 
00096   nsWidget *mDropWidget;
00097   nsCOMPtr <nsISupportsArray> mSourceDataItems;
00098 
00099   void CreateDragCursor(PRUint32 aActionType);
00100 };
00101 
00102 #endif // nsDragService_h__