Observable.h

00001 /*
00002  * Copyright (c) 2003-2005, Bram Stein
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without 
00006  * modification, are permitted provided that the following conditions 
00007  * are met:
00008  * 
00009  *  1. Redistributions of source code must retain the above copyright
00010  *     notice, this list of conditions and the following disclaimer. 
00011  *  2. Redistributions in binary form must reproduce the above copyright 
00012  *     notice, this list of conditions and the following disclaimer in the 
00013  *     documentation and/or other materials provided with the distribution. 
00014  *  3. The name of the author may not be used to endorse or promote products 
00015  *     derived from this software without specific prior written permission. 
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED 
00018  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
00019  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 
00020  * EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
00021  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
00022  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
00023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
00024  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
00025  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
00026  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 #pragma once
00029 #ifndef OBSERVABLE_H
00030 #define OBSERVABLE_H
00031 
00032 #include "..\Pointers.h"
00033 
00034 namespace ui
00035 {
00036     namespace util
00037     {
00046         class Observable
00047         {
00048         public:
00054             void addObserver(Observer* observer);
00055 
00061             void removeObserver(Observer* observer);
00062 
00066             void removeObservers();
00067 
00075             void notifyObserver();
00076 
00080             virtual ~Observable();
00081         protected:
00087             void setChanged();
00088 
00092             bool hasChanged() const;
00093 
00097             void clearChanged();
00098 
00102             Observable();
00103         private:
00104             bool isChanged;
00105             ObserverList observerList;
00106         };
00107     }
00108 }
00109 
00110 #endif

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