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# qwt_paint_buffer.h

    00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
    00002  * Qwt Widget Library
    00003  * Copyright (C) 1997   Josef Wilgen
    00004  * Copyright (C) 2002   Uwe Rathmann
    00005  *
    00006  * This library is free software; you can redistribute it and/or
    00007  * modify it under the terms of the Qwt License, Version 1.0
    00008  *****************************************************************************/
    00009
    00010 #ifndef QWT_PAINT_BUFFER_H
    00011 #define QWT_PAINT_BUFFER_H 1
    00012
    00013 #include <qpixmap.h>
    00014 #include "qwt_global.h"
    00015
    00016 class QPainter;
    00017
    00026 class QWT_EXPORT QwtPaintBuffer
    00027 {
    00028 public:
    00029     QwtPaintBuffer();
    00030     QwtPaintBuffer(QPaintDevice *, const QRect &, QPainter *p = NULL);
    00031
    00032     virtual ~QwtPaintBuffer();
    00033
    00034     void open(QPaintDevice *, const QRect &, QPainter *p = NULL);
    00035     void close();
    00036
    00037     QPainter *painter();
    00038     const QPaintDevice *device();
    00039
    00040     static void setEnabled(bool enable);
    00041     static bool isEnabled();
    00042
    00044     const QPixmap &buffer() const { return d_pixBuffer; }
    00045
    00046 protected:
    00047     void flush();
    00048
    00049 private:
    00050     QPixmap d_pixBuffer;
    00051     QRect d_rect;
    00052
    00053     QPaintDevice *d_device; // use QGuardedPtr
    00054     QPainter *d_painter; // use QGuardedPtr
    00055     QPainter *d_devicePainter; // use QGuardedPtr
    00056
    00057     static bool d_enabled;
    00058 };
    00059
    00060 #endif