qwt_paint_buffer.h

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00001 /*-*- c++ -*-******************************************************************
00002  * Qwt Widget Library 
00003  * Copyright (C) 1997   Josef Wilgen
00004  * 
00005  * This library is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU Lesser General Public
00007  * License as published by the Free Software Foundation; either
00008  * version 2.1 of the License, or (at your option) any later version.
00009  * 
00010  * This library is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Lesser General Public License for more details.
00014  * 
00015  * You should have received a copy of the GNU Lesser General Public
00016  * License along with this library; if not, write to the Free Software
00017  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018  *****************************************************************************/
00019 
00020 #ifndef QWT_PAINT_BUFFER_H
00021 #define QWT_PAINT_BUFFER_H 1
00022 
00023 #include <qpixmap.h>
00024 //#include "qwt_global.h"
00025 
00026 class QPainter;
00027 
00028 namespace hippodraw {
00029 
00038 class QwtPaintBuffer
00039 {
00040 public:
00041     QwtPaintBuffer();
00042     QwtPaintBuffer(QPaintDevice *, const QRect &, QPainter *painter = NULL);
00043 
00044     virtual ~QwtPaintBuffer();
00045 
00046     void open(QPaintDevice *, const QRect &, QPainter *painter = NULL);
00047     void close();
00048 
00049     QPainter *painter();
00050     const QPaintDevice *device();
00051     
00052     static void setEnabled(bool enable);
00053     static bool isEnabled();
00054 
00055 protected:
00056     void flush();
00057 
00058 private:
00059     QPixmap d_pixBuffer;
00060     QRect d_rect;
00061 
00062     QPaintDevice *d_device; // use QGuardedPtr
00063     QPainter *d_painter; // use QGuardedPtr
00064     QPainter *d_devicePainter; // use QGuardedPtr
00065 
00066     static bool d_enabled;
00067 };
00068 
00069 } // namespace hippodraw
00070 
00071 #endif

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