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lightning-sunbird  0.9+nobinonly
nsAutoCopyListener.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla Communicator client code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
00026  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #ifndef nsAutoCopyListener_h_
00039 #define nsAutoCopyListener_h_
00040 
00041 #include "nsISelectionListener.h"
00042 #include "nsISelectionPrivate.h"
00043 
00044 class nsAutoCopyListener : public nsISelectionListener
00045 {
00046 public:
00047   NS_DECL_ISUPPORTS
00048   NS_DECL_NSISELECTIONLISTENER
00049 
00050   void Listen(nsISelectionPrivate *aSelection)
00051   {
00052       NS_ASSERTION(aSelection, "Null selection passed to Listen()");
00053       aSelection->AddSelectionListener(this);
00054   }
00055 
00056   static nsAutoCopyListener* GetInstance()
00057   {
00058     if (!sInstance) {
00059       sInstance = new nsAutoCopyListener();
00060       if (!sInstance)
00061         return nsnull;
00062 
00063       NS_ADDREF(sInstance);
00064     }
00065 
00066     return sInstance;
00067   }
00068 
00069   static void Shutdown()
00070   {
00071     NS_IF_RELEASE(sInstance);
00072   }
00073 
00074 private:
00075   static nsAutoCopyListener* sInstance;
00076 };
00077 
00078 #endif