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<h1>qwt_paint_buffer.cpp</h1><pre class="fragment"><div>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span>
00002 <span class="comment"> * Qwt Widget Library</span>
00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span>
00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span>
00005 <span class="comment"> *</span>
00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span>
00008 <span class="comment"> *****************************************************************************/</span>
00009
00010 <span class="preprocessor">#include <qwidget.h></span>
00011 <span class="preprocessor">#include <qpainter.h></span>
00012 <span class="preprocessor">#include "qwt_paint_buffer.h"</span>
00013
00014 <span class="keywordtype">bool</span> QwtPaintBuffer::d_enabled = TRUE;
00015
<a name="l00017"></a><a class="code" href="class_qwt_paint_buffer.html#a0">00017</a> <a class="code" href="class_qwt_paint_buffer.html#a0">QwtPaintBuffer::QwtPaintBuffer</a>():
00018 d_device(0),
00019 d_painter(0),
00020 d_devicePainter(0)
00021 {
00022 }
00023
<a name="l00034"></a><a class="code" href="class_qwt_paint_buffer.html#a1">00034</a> <a class="code" href="class_qwt_paint_buffer.html#a0">QwtPaintBuffer::QwtPaintBuffer</a>(QPaintDevice *device,
00035 <span class="keyword">const</span> QRect &rect, QPainter *painter):
00036 d_device(0),
00037 d_painter(0),
00038 d_devicePainter(0)
00039 {
00040 <a class="code" href="class_qwt_paint_buffer.html#a3">open</a>(device, rect, painter);
00041 }
00042
<a name="l00047"></a><a class="code" href="class_qwt_paint_buffer.html#a2">00047</a> <a class="code" href="class_qwt_paint_buffer.html#a2">QwtPaintBuffer::~QwtPaintBuffer</a>()
00048 {
00049 <a class="code" href="class_qwt_paint_buffer.html#a4">close</a>();
00050 }
00051
<a name="l00058"></a><a class="code" href="class_qwt_paint_buffer.html#a5">00058</a> QPainter *<a class="code" href="class_qwt_paint_buffer.html#a5">QwtPaintBuffer::painter</a>()
00059 {
00060 <span class="keywordflow">return</span> d_painter;
00061 }
00062
<a name="l00066"></a><a class="code" href="class_qwt_paint_buffer.html#a6">00066</a> <span class="keyword">const</span> QPaintDevice *<a class="code" href="class_qwt_paint_buffer.html#a6">QwtPaintBuffer::device</a>()
00067 {
00068 <span class="keywordflow">return</span> d_device;
00069 }
00070
<a name="l00076"></a><a class="code" href="class_qwt_paint_buffer.html#e0">00076</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_paint_buffer.html#e0">QwtPaintBuffer::setEnabled</a>(<span class="keywordtype">bool</span> enable)
00077 {
00078 d_enabled = enable;
00079 }
00080
<a name="l00084"></a><a class="code" href="class_qwt_paint_buffer.html#e1">00084</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_paint_buffer.html#e1">QwtPaintBuffer::isEnabled</a>()
00085 {
00086 <span class="keywordflow">return</span> d_enabled;
00087 }
00088
<a name="l00097"></a><a class="code" href="class_qwt_paint_buffer.html#a3">00097</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_paint_buffer.html#a3">QwtPaintBuffer::open</a>(QPaintDevice *device,
00098 <span class="keyword">const</span> QRect &rect, QPainter *painter)
00099 {
00100 <a class="code" href="class_qwt_paint_buffer.html#a4">close</a>();
00101
00102 <span class="keywordflow">if</span> ( device == 0 || !rect.isValid() )
00103 <span class="keywordflow">return</span>;
00104
00105 d_device = device;
00106 d_devicePainter = painter;
00107 d_rect = rect;
00108
00109 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_paint_buffer.html#e1">isEnabled</a>() )
00110 {
00111 <span class="preprocessor">#if QT_VERSION >= 300</span>
00112 <span class="preprocessor"></span><span class="preprocessor">#ifdef Q_WS_X11</span>
00113 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( d_pixBuffer.x11Screen() != d_device->x11Screen() )
00114 d_pixBuffer.x11SetScreen(d_device->x11Screen());
00115 <span class="preprocessor">#endif</span>
00116 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00117 <span class="preprocessor"></span> d_pixBuffer.resize(d_rect.size());
00118
00119 d_painter = <span class="keyword">new</span> QPainter();
00120 <span class="keywordflow">if</span> ( d_device->devType() == QInternal::Widget )
00121 {
00122 QWidget *w = (QWidget *)d_device;
00123 d_pixBuffer.fill(w, d_rect.topLeft());
00124 d_painter->begin(&d_pixBuffer, w);
00125 d_painter->translate(-d_rect.x(), -d_rect.y());
00126 }
00127 <span class="keywordflow">else</span>
00128 {
00129 d_painter->begin(&d_pixBuffer);
00130 }
00131 }
00132 <span class="keywordflow">else</span>
00133 {
00134 <span class="keywordflow">if</span> ( d_devicePainter )
00135 d_painter = d_devicePainter;
00136 <span class="keywordflow">else</span>
00137 d_painter = <span class="keyword">new</span> QPainter(d_device);
00138
00139 <span class="keywordflow">if</span> ( d_device->devType() == QInternal::Widget )
00140 {
00141 QWidget *w = (QWidget *)d_device;
00142 <span class="keywordflow">if</span> ( w->testWFlags( Qt::WRepaintNoErase | Qt::WResizeNoErase) )
00143 d_painter->eraseRect(d_rect);
00144 }
00145 }
00146 }
00147
<a name="l00151"></a><a class="code" href="class_qwt_paint_buffer.html#b0">00151</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_paint_buffer.html#b0">QwtPaintBuffer::flush</a>()
00152 {
00153 <span class="keywordflow">if</span> ( d_enabled && d_device != 0 && d_rect.isValid())
00154 {
00155 <span class="comment">// We need a painter to find out if</span>
00156 <span class="comment">// there is a painter redirection for d_device.</span>
00157
00158 QPainter *p;
00159 <span class="keywordflow">if</span> ( d_devicePainter == 0 )
00160 p = <span class="keyword">new</span> QPainter(d_device);
00161 <span class="keywordflow">else</span>
00162 p = d_devicePainter;
00163
00164 QPaintDevice *<a class="code" href="class_qwt_paint_buffer.html#a6">device</a> = p->device();
00165 <span class="keywordflow">if</span> ( device->isExtDev() )
00166 d_devicePainter->drawPixmap(d_rect.topLeft(), d_pixBuffer);
00167 <span class="keywordflow">else</span>
00168 bitBlt(device, d_rect.topLeft(), &d_pixBuffer );
00169
00170 <span class="keywordflow">if</span> ( d_devicePainter == 0 )
00171 <span class="keyword">delete</span> p;
00172 }
00173 }
00174
<a name="l00178"></a><a class="code" href="class_qwt_paint_buffer.html#a4">00178</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_paint_buffer.html#a4">QwtPaintBuffer::close</a>()
00179 {
00180 <a class="code" href="class_qwt_paint_buffer.html#b0">flush</a>();
00181
00182 <span class="keywordflow">if</span> ( d_painter )
00183 {
00184 <span class="keywordflow">if</span> ( d_painter->isActive() )
00185 d_painter->end();
00186
00187 <span class="keywordflow">if</span> ( d_painter != d_devicePainter )
00188 <span class="keyword">delete</span> d_painter;
00189 }
00190
00191 <span class="keywordflow">if</span> ( !d_pixBuffer.isNull() )
00192 d_pixBuffer = QPixmap();
00193
00194 d_device = 0;
00195 d_painter = 0;
00196 d_devicePainter = 0;
00197 }
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