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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: qwt_paint_buffer.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><h1>qwt_paint_buffer.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span><a name="l00002"></a>00002 <span class="comment"> * Qwt Widget Library</span><a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span><a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span><a name="l00005"></a>00005 <span class="comment"> *</span><a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span><a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span><a name="l00008"></a>00008 <span class="comment"> *****************************************************************************/</span><a name="l00009"></a>00009 <a name="l00010"></a>00010 <a name="l00011"></a>00011 <span class="preprocessor">#include <qglobal.h></span><a name="l00012"></a>00012 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00013"></a>00013 <span class="preprocessor"></span><a name="l00014"></a>00014 <span class="preprocessor">#include <qwidget.h></span><a name="l00015"></a>00015 <span class="preprocessor">#include <qpainter.h></span><a name="l00016"></a>00016 <span class="preprocessor">#include "qwt_paint_buffer.h"</span><a name="l00017"></a>00017 <a name="l00018"></a>00018 <span class="keywordtype">bool</span> QwtPaintBuffer::d_enabled = <span class="keyword">true</span>;<a name="l00019"></a>00019 <a name="l00021"></a>00021 QwtPaintBuffer::QwtPaintBuffer():<a name="l00022"></a>00022 d_device(0),<a name="l00023"></a>00023 d_painter(0),<a name="l00024"></a>00024 d_devicePainter(0)<a name="l00025"></a>00025 {<a name="l00026"></a>00026 }<a name="l00027"></a>00027 <a name="l00038"></a>00038 QwtPaintBuffer::QwtPaintBuffer(QPaintDevice *device, <a name="l00039"></a>00039 <span class="keyword">const</span> QRect &rect, QPainter *painter):<a name="l00040"></a>00040 d_device(0),<a name="l00041"></a>00041 d_painter(0),<a name="l00042"></a>00042 d_devicePainter(0)<a name="l00043"></a>00043 {<a name="l00044"></a>00044 open(device, rect, painter);<a name="l00045"></a>00045 }<a name="l00046"></a>00046 <a name="l00051"></a>00051 QwtPaintBuffer::~QwtPaintBuffer()<a name="l00052"></a>00052 {<a name="l00053"></a>00053 close();<a name="l00054"></a>00054 }<a name="l00055"></a>00055 <a name="l00062"></a>00062 QPainter *QwtPaintBuffer::painter() <a name="l00063"></a>00063 { <a name="l00064"></a>00064 <span class="keywordflow">return</span> d_painter; <a name="l00065"></a>00065 }<a name="l00066"></a>00066 <a name="l00070"></a>00070 <span class="keyword">const</span> QPaintDevice *QwtPaintBuffer::device() <a name="l00071"></a>00071 { <a name="l00072"></a>00072 <span class="keywordflow">return</span> d_device; <a name="l00073"></a>00073 }<a name="l00074"></a>00074 <a name="l00080"></a>00080 <span class="keywordtype">void</span> QwtPaintBuffer::setEnabled(<span class="keywordtype">bool</span> enable) <a name="l00081"></a>00081 { <a name="l00082"></a>00082 d_enabled = enable; <a name="l00083"></a>00083 }<a name="l00084"></a>00084 <a name="l00088"></a>00088 <span class="keywordtype">bool</span> QwtPaintBuffer::isEnabled() <a name="l00089"></a>00089 { <a name="l00090"></a>00090 <span class="keywordflow">return</span> d_enabled; <a name="l00091"></a>00091 }<a name="l00092"></a>00092 <a name="l00101"></a>00101 <span class="keywordtype">void</span> QwtPaintBuffer::open(QPaintDevice *device, <a name="l00102"></a>00102 <span class="keyword">const</span> QRect &rect, QPainter *painter)<a name="l00103"></a>00103 {<a name="l00104"></a>00104 close();<a name="l00105"></a>00105 <a name="l00106"></a>00106 <span class="keywordflow">if</span> ( device == 0 || !rect.isValid() )<a name="l00107"></a>00107 <span class="keywordflow">return</span>;<a name="l00108"></a>00108 <a name="l00109"></a>00109 d_device = device;<a name="l00110"></a>00110 d_devicePainter = painter;<a name="l00111"></a>00111 d_rect = rect;<a name="l00112"></a>00112 <a name="l00113"></a>00113 <span class="keywordflow">if</span> ( isEnabled() )<a name="l00114"></a>00114 {<a name="l00115"></a>00115 <span class="preprocessor">#ifdef Q_WS_X11</span><a name="l00116"></a>00116 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( d_pixBuffer.x11Screen() != d_device->x11Screen() )<a name="l00117"></a>00117 d_pixBuffer.x11SetScreen(d_device->x11Screen());<a name="l00118"></a>00118 <span class="preprocessor">#endif</span><a name="l00119"></a>00119 <span class="preprocessor"></span> d_pixBuffer.resize(d_rect.size());<a name="l00120"></a>00120 <a name="l00121"></a>00121 d_painter = <span class="keyword">new</span> QPainter();<a name="l00122"></a>00122 <span class="keywordflow">if</span> ( d_device->devType() == QInternal::Widget )<a name="l00123"></a>00123 {<a name="l00124"></a>00124 QWidget *w = (QWidget *)d_device;<a name="l00125"></a>00125 d_pixBuffer.fill(w, d_rect.topLeft());<a name="l00126"></a>00126 d_painter->begin(&d_pixBuffer, w);<a name="l00127"></a>00127 d_painter->translate(-d_rect.x(), -d_rect.y());<a name="l00128"></a>00128 }<a name="l00129"></a>00129 <span class="keywordflow">else</span><a name="l00130"></a>00130 {<a name="l00131"></a>00131 d_painter->begin(&d_pixBuffer);<a name="l00132"></a>00132 }<a name="l00133"></a>00133 }<a name="l00134"></a>00134 <span class="keywordflow">else</span><a name="l00135"></a>00135 {<a name="l00136"></a>00136 <span class="keywordflow">if</span> ( d_devicePainter )<a name="l00137"></a>00137 d_painter = d_devicePainter;<a name="l00138"></a>00138 <span class="keywordflow">else</span><a name="l00139"></a>00139 d_painter = <span class="keyword">new</span> QPainter(d_device);<a name="l00140"></a>00140 <a name="l00141"></a>00141 <span class="keywordflow">if</span> ( d_device->devType() == QInternal::Widget )<a name="l00142"></a>00142 {<a name="l00143"></a>00143 QWidget *w = (QWidget *)d_device;<a name="l00144"></a>00144 <span class="keywordflow">if</span> ( w->testWFlags( Qt::WNoAutoErase ) )<a name="l00145"></a>00145 d_painter->eraseRect(d_rect);<a name="l00146"></a>00146 }<a name="l00147"></a>00147 }<a name="l00148"></a>00148 }<a name="l00149"></a>00149 <a name="l00153"></a>00153 <span class="keywordtype">void</span> QwtPaintBuffer::flush()<a name="l00154"></a>00154 {<a name="l00155"></a>00155 <span class="keywordflow">if</span> ( d_enabled && d_device != 0 && d_rect.isValid())<a name="l00156"></a>00156 {<a name="l00157"></a>00157 <span class="comment">// We need a painter to find out if</span><a name="l00158"></a>00158 <span class="comment">// there is a painter redirection for d_device.</span><a name="l00159"></a>00159 <a name="l00160"></a>00160 QPainter *p;<a name="l00161"></a>00161 <span class="keywordflow">if</span> ( d_devicePainter == 0 )<a name="l00162"></a>00162 p = <span class="keyword">new</span> QPainter(d_device);<a name="l00163"></a>00163 <span class="keywordflow">else</span> <a name="l00164"></a>00164 p = d_devicePainter;<a name="l00165"></a>00165 <a name="l00166"></a>00166 QPaintDevice *device = p->device();<a name="l00167"></a>00167 <span class="keywordflow">if</span> ( device->isExtDev() )<a name="l00168"></a>00168 d_devicePainter->drawPixmap(d_rect.topLeft(), d_pixBuffer);<a name="l00169"></a>00169 <span class="keywordflow">else</span><a name="l00170"></a>00170 bitBlt(device, d_rect.topLeft(), &d_pixBuffer );<a name="l00171"></a>00171 <a name="l00172"></a>00172 <span class="keywordflow">if</span> ( d_devicePainter == 0 )<a name="l00173"></a>00173 <span class="keyword">delete</span> p;<a name="l00174"></a>00174 }<a name="l00175"></a>00175 }<a name="l00176"></a>00176 <a name="l00180"></a>00180 <span class="keywordtype">void</span> QwtPaintBuffer::close()<a name="l00181"></a>00181 {<a name="l00182"></a>00182 flush();<a name="l00183"></a>00183 <a name="l00184"></a>00184 <span class="keywordflow">if</span> ( d_painter )<a name="l00185"></a>00185 {<a name="l00186"></a>00186 <span class="keywordflow">if</span> ( d_painter->isActive() )<a name="l00187"></a>00187 d_painter->end();<a name="l00188"></a>00188 <a name="l00189"></a>00189 <span class="keywordflow">if</span> ( d_painter != d_devicePainter )<a name="l00190"></a>00190 <span class="keyword">delete</span> d_painter;<a name="l00191"></a>00191 }<a name="l00192"></a>00192 <a name="l00193"></a>00193 <span class="keywordflow">if</span> ( !d_pixBuffer.isNull() )<a name="l00194"></a>00194 d_pixBuffer = QPixmap();<a name="l00195"></a>00195 <a name="l00196"></a>00196 d_device = 0;<a name="l00197"></a>00197 d_painter = 0;<a name="l00198"></a>00198 d_devicePainter = 0;<a name="l00199"></a>00199 } <a name="l00200"></a>00200 <a name="l00201"></a>00201 <span class="preprocessor">#endif // QT_VERSION < 0x040000</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Feb 26 21:22:37 2007 for Qwt User's Guide by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address></body></html>⌨️ 快捷键说明
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