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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
*****************************************************************************/
#include <qglobal.h>
#if QT_VERSION < 0x040000
#include <qwidget.h>
#include <qpainter.h>
#include "qwt_paint_buffer.h"
bool QwtPaintBuffer::d_enabled = true;
//! Default constructor
QwtPaintBuffer::QwtPaintBuffer():
d_device(0),
d_painter(0),
d_devicePainter(0)
{
}
/*!
Create an open paint buffer
\param device Device to paint on
\param rect Rect to paint on
\param painter Painter to paint on device. In case of 0
QwtPaintBuffer uses an internal painter
\sa open()
*/
QwtPaintBuffer::QwtPaintBuffer(QPaintDevice *device,
const QRect &rect, QPainter *painter):
d_device(0),
d_painter(0),
d_devicePainter(0)
{
open(device, rect, painter);
}
/*!
Closes the buffer
\sa close()
*/
QwtPaintBuffer::~QwtPaintBuffer()
{
close();
}
/*!
\return Depending on isEnabled() the painter
connected to an internal pixmap buffer
otherwise the painter connected to the device.
*/
QPainter *QwtPaintBuffer::painter()
{
return d_painter;
}
/*!
\return Device to paint on
*/
const QPaintDevice *QwtPaintBuffer::device()
{
return d_device;
}
/*!
Enable/Disable double buffering. Please note that
this is a global switch for all QwtPaintBuffers, but
won't change opened buffers.
*/
void QwtPaintBuffer::setEnabled(bool enable)
{
d_enabled = enable;
}
/*!
\return true if double buffering is enabled, false otherwise.
*/
bool QwtPaintBuffer::isEnabled()
{
return d_enabled;
}
/*!
Open the buffer
\param device Device to paint on
\param rect Rect to paint on
\param painter Painter to paint on device. In case of 0
QwtPaintBuffer uses an internal painter
*/
void QwtPaintBuffer::open(QPaintDevice *device,
const QRect &rect, QPainter *painter)
{
close();
if ( device == 0 || !rect.isValid() )
return;
d_device = device;
d_devicePainter = painter;
d_rect = rect;
if ( isEnabled() )
{
#ifdef Q_WS_X11
if ( d_pixBuffer.x11Screen() != d_device->x11Screen() )
d_pixBuffer.x11SetScreen(d_device->x11Screen());
#endif
d_pixBuffer.resize(d_rect.size());
d_painter = new QPainter();
if ( d_device->devType() == QInternal::Widget )
{
QWidget *w = (QWidget *)d_device;
d_pixBuffer.fill(w, d_rect.topLeft());
d_painter->begin(&d_pixBuffer, w);
d_painter->translate(-d_rect.x(), -d_rect.y());
}
else
{
d_painter->begin(&d_pixBuffer);
}
}
else
{
if ( d_devicePainter )
d_painter = d_devicePainter;
else
d_painter = new QPainter(d_device);
if ( d_device->devType() == QInternal::Widget )
{
QWidget *w = (QWidget *)d_device;
if ( w->testWFlags( Qt::WNoAutoErase ) )
d_painter->eraseRect(d_rect);
}
}
}
/*!
Flush the internal pixmap buffer to the device.
*/
void QwtPaintBuffer::flush()
{
if ( d_enabled && d_device != 0 && d_rect.isValid())
{
// We need a painter to find out if
// there is a painter redirection for d_device.
QPainter *p;
if ( d_devicePainter == 0 )
p = new QPainter(d_device);
else
p = d_devicePainter;
QPaintDevice *device = p->device();
if ( device->isExtDev() )
d_devicePainter->drawPixmap(d_rect.topLeft(), d_pixBuffer);
else
bitBlt(device, d_rect.topLeft(), &d_pixBuffer );
if ( d_devicePainter == 0 )
delete p;
}
}
/*!
Flush the internal pixmap buffer to the device and close the buffer.
*/
void QwtPaintBuffer::close()
{
flush();
if ( d_painter )
{
if ( d_painter->isActive() )
d_painter->end();
if ( d_painter != d_devicePainter )
delete d_painter;
}
if ( !d_pixBuffer.isNull() )
d_pixBuffer = QPixmap();
d_device = 0;
d_painter = 0;
d_devicePainter = 0;
}
#endif // QT_VERSION < 0x040000