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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_PAINT_BUFFER_H
#define QWT_PAINT_BUFFER_H 1
#include <qpixmap.h>
#include "qwt_global.h"
class QPainter;
/*!
\brief Paint buffer for Qwt widgets
QwtPaintBuffer offers a simple way to en/disable double buffering.
Double buffering is enabled as default and in general there will be
no reason to change this.
*/
class QWT_EXPORT QwtPaintBuffer
{
public:
QwtPaintBuffer();
QwtPaintBuffer(QPaintDevice *, const QRect &, QPainter *p = NULL);
virtual ~QwtPaintBuffer();
void open(QPaintDevice *, const QRect &, QPainter *p = NULL);
void close();
QPainter *painter();
const QPaintDevice *device();
static void setEnabled(bool enable);
static bool isEnabled();
//! Return Buffer used for double buffering
const QPixmap &buffer() const { return d_pixBuffer; }
protected:
void flush();
private:
QPixmap d_pixBuffer;
QRect d_rect;
QPaintDevice *d_device; // use QGuardedPtr
QPainter *d_painter; // use QGuardedPtr
QPainter *d_devicePainter; // use QGuardedPtr
static bool d_enabled;
};
#endif
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