00001 /********************************************************************************* 00002 * 00003 * Razor! Engine - A modular C++ presentation engine 00004 * 00005 * $Id: DoubleBufferCanvas.h,v 1.2 2000/12/09 10:47:30 christ Exp $ 00006 * 00007 * Copyright (c) 2000 Tilo Christ. All Rights Reserved. 00008 * 00009 * This library is free software; you can redistribute it and/or 00010 * modify it under the terms of the GNU Lesser General Public 00011 * License as published by the Free Software Foundation; either 00012 * version 2.1 of the License, or (at your option) any later version. 00013 * 00014 * This library is distributed in the hope that it will be useful, 00015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 * Lesser General Public License for more details. 00018 * 00019 * You should have received a copy of the GNU Lesser General Public 00020 * License along with this library; if not, write to the Free Software 00021 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00022 * 00023 **********************************************************************************/ 00024 00025 00026 #ifndef DOUBLEBUFFERCANVAS_H 00027 #define DOUBLEBUFFERCANVAS_H 00028 00029 #include <PalmOS.h> 00030 #include "Canvas.h" 00031 00032 00033 00034 /** 00035 * DoubleBufferCanvas manages a <EM>double-buffered</EM> canvas into which a user can paint. 00036 */ 00037 class DoubleBufferCanvas : public Canvas 00038 { 00039 public: 00040 00041 DoubleBufferCanvas(); 00042 00043 ~DoubleBufferCanvas(); 00044 00045 void beginDraw(WinLockInitType initMode); 00046 00047 void endDraw(RectangleType *bounds); 00048 00049 void show(); 00050 00051 private: 00052 WinHandle deviceDrawWindowH; 00053 WinHandle screenBufferH; 00054 00055 RectangleType currentBounds; 00056 RectangleType lastBounds; 00057 RectangleType copyBounds; 00058 }; 00059 00060 00061 #endif