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<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>
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<a name="l00002"></a>00002 <span class="comment"> * Qwt Widget Library</span>
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<a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span>
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<a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span>
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<a name="l00005"></a>00005 <span class="comment"> *</span>
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<a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
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<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span>
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<a name="l00008"></a>00008 <span class="comment"> *****************************************************************************/</span>
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<a name="l00009"></a>00009
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<a name="l00010"></a>00010
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<a name="l00011"></a>00011 <span class="preprocessor">#include <qglobal.h></span>
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<a name="l00012"></a>00012 <span class="preprocessor">#if QT_VERSION < 0x040000</span>
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<a name="l00013"></a>00013 <span class="preprocessor"></span>
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<a name="l00014"></a>00014 <span class="preprocessor">#include <qwidget.h></span>
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<a name="l00015"></a>00015 <span class="preprocessor">#include <qpainter.h></span>
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<a name="l00016"></a>00016 <span class="preprocessor">#include "qwt_paint_buffer.h"</span>
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018 <span class="keywordtype">bool</span> QwtPaintBuffer::d_enabled = <span class="keyword">true</span>;
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<a name="l00019"></a>00019
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<a name="l00021"></a>00021 QwtPaintBuffer::QwtPaintBuffer():
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<a name="l00022"></a>00022 d_device(0),
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<a name="l00023"></a>00023 d_painter(0),
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<a name="l00024"></a>00024 d_devicePainter(0)
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<a name="l00025"></a>00025 {
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<a name="l00026"></a>00026 }
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<a name="l00027"></a>00027
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<a name="l00038"></a>00038 QwtPaintBuffer::QwtPaintBuffer(QPaintDevice *device,
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<a name="l00039"></a>00039 <span class="keyword">const</span> QRect &rect, QPainter *painter):
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<a name="l00040"></a>00040 d_device(0),
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<a name="l00041"></a>00041 d_painter(0),
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<a name="l00042"></a>00042 d_devicePainter(0)
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<a name="l00043"></a>00043 {
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<a name="l00044"></a>00044 open(device, rect, painter);
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<a name="l00045"></a>00045 }
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<a name="l00046"></a>00046
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<a name="l00051"></a>00051 QwtPaintBuffer::~QwtPaintBuffer()
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<a name="l00052"></a>00052 {
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<a name="l00053"></a>00053 close();
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<a name="l00054"></a>00054 }
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<a name="l00055"></a>00055
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<a name="l00062"></a>00062 QPainter *QwtPaintBuffer::painter()
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<a name="l00063"></a>00063 {
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<a name="l00064"></a>00064 <span class="keywordflow">return</span> d_painter;
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<a name="l00065"></a>00065 }
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<a name="l00066"></a>00066
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<a name="l00070"></a>00070 <span class="keyword">const</span> QPaintDevice *QwtPaintBuffer::device()
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<a name="l00071"></a>00071 {
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<a name="l00072"></a>00072 <span class="keywordflow">return</span> d_device;
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<a name="l00073"></a>00073 }
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<a name="l00074"></a>00074
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<a name="l00080"></a>00080 <span class="keywordtype">void</span> QwtPaintBuffer::setEnabled(<span class="keywordtype">bool</span> enable)
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<a name="l00081"></a>00081 {
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<a name="l00082"></a>00082 d_enabled = enable;
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<a name="l00083"></a>00083 }
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<a name="l00084"></a>00084
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<a name="l00088"></a>00088 <span class="keywordtype">bool</span> QwtPaintBuffer::isEnabled()
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<a name="l00089"></a>00089 {
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<a name="l00090"></a>00090 <span class="keywordflow">return</span> d_enabled;
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<a name="l00091"></a>00091 }
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<a name="l00092"></a>00092
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<a name="l00101"></a>00101 <span class="keywordtype">void</span> QwtPaintBuffer::open(QPaintDevice *device,
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<a name="l00102"></a>00102 <span class="keyword">const</span> QRect &rect, QPainter *painter)
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<a name="l00103"></a>00103 {
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<a name="l00104"></a>00104 close();
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<a name="l00105"></a>00105
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<a name="l00106"></a>00106 <span class="keywordflow">if</span> ( device == 0 || !rect.isValid() )
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<a name="l00107"></a>00107 <span class="keywordflow">return</span>;
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<a name="l00108"></a>00108
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<a name="l00109"></a>00109 d_device = device;
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<a name="l00110"></a>00110 d_devicePainter = painter;
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<a name="l00111"></a>00111 d_rect = rect;
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<a name="l00112"></a>00112
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<a name="l00113"></a>00113 <span class="keywordflow">if</span> ( isEnabled() )
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<a name="l00114"></a>00114 {
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<a name="l00115"></a>00115 <span class="preprocessor">#ifdef Q_WS_X11</span>
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<a name="l00116"></a>00116 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( d_pixBuffer.x11Screen() != d_device->x11Screen() )
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<a name="l00117"></a>00117 d_pixBuffer.x11SetScreen(d_device->x11Screen());
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<a name="l00118"></a>00118 <span class="preprocessor">#endif</span>
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<a name="l00119"></a>00119 <span class="preprocessor"></span> d_pixBuffer.resize(d_rect.size());
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<a name="l00120"></a>00120
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<a name="l00121"></a>00121 d_painter = <span class="keyword">new</span> QPainter();
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<a name="l00122"></a>00122 <span class="keywordflow">if</span> ( d_device->devType() == QInternal::Widget )
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<a name="l00123"></a>00123 {
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<a name="l00124"></a>00124 QWidget *w = (QWidget *)d_device;
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<a name="l00125"></a>00125 d_pixBuffer.fill(w, d_rect.topLeft());
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<a name="l00126"></a>00126 d_painter->begin(&d_pixBuffer, w);
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<a name="l00127"></a>00127 d_painter->translate(-d_rect.x(), -d_rect.y());
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<a name="l00128"></a>00128 }
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<a name="l00129"></a>00129 <span class="keywordflow">else</span>
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<a name="l00130"></a>00130 {
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<a name="l00131"></a>00131 d_painter->begin(&d_pixBuffer);
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<a name="l00132"></a>00132 }
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<a name="l00133"></a>00133 }
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<a name="l00134"></a>00134 <span class="keywordflow">else</span>
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<a name="l00135"></a>00135 {
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<a name="l00136"></a>00136 <span class="keywordflow">if</span> ( d_devicePainter )
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<a name="l00137"></a>00137 d_painter = d_devicePainter;
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<a name="l00138"></a>00138 <span class="keywordflow">else</span>
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<a name="l00139"></a>00139 d_painter = <span class="keyword">new</span> QPainter(d_device);
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<a name="l00140"></a>00140
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<a name="l00141"></a>00141 <span class="keywordflow">if</span> ( d_device->devType() == QInternal::Widget )
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<a name="l00142"></a>00142 {
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<a name="l00143"></a>00143 QWidget *w = (QWidget *)d_device;
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<a name="l00144"></a>00144 <span class="keywordflow">if</span> ( w->testWFlags( Qt::WNoAutoErase ) )
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<a name="l00145"></a>00145 d_painter->eraseRect(d_rect);
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<a name="l00146"></a>00146 }
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<a name="l00147"></a>00147 }
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<a name="l00148"></a>00148 }
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<a name="l00149"></a>00149
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<a name="l00153"></a>00153 <span class="keywordtype">void</span> QwtPaintBuffer::flush()
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<a name="l00154"></a>00154 {
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<a name="l00155"></a>00155 <span class="keywordflow">if</span> ( d_enabled && d_device != 0 && d_rect.isValid())
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<a name="l00156"></a>00156 {
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<a name="l00157"></a>00157 <span class="comment">// We need a painter to find out if</span>
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<a name="l00158"></a>00158 <span class="comment">// there is a painter redirection for d_device.</span>
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<a name="l00159"></a>00159
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<a name="l00160"></a>00160 QPainter *p;
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<a name="l00161"></a>00161 <span class="keywordflow">if</span> ( d_devicePainter == 0 )
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<a name="l00162"></a>00162 p = <span class="keyword">new</span> QPainter(d_device);
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<a name="l00163"></a>00163 <span class="keywordflow">else</span>
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<a name="l00164"></a>00164 p = d_devicePainter;
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<a name="l00165"></a>00165
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<a name="l00166"></a>00166 QPaintDevice *device = p->device();
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<a name="l00167"></a>00167 <span class="keywordflow">if</span> ( device->isExtDev() )
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<a name="l00168"></a>00168 d_devicePainter->drawPixmap(d_rect.topLeft(), d_pixBuffer);
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<a name="l00169"></a>00169 <span class="keywordflow">else</span>
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<a name="l00170"></a>00170 bitBlt(device, d_rect.topLeft(), &d_pixBuffer );
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<a name="l00171"></a>00171
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<a name="l00172"></a>00172 <span class="keywordflow">if</span> ( d_devicePainter == 0 )
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<a name="l00173"></a>00173 <span class="keyword">delete</span> p;
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<a name="l00174"></a>00174 }
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<a name="l00175"></a>00175 }
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<a name="l00176"></a>00176
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<a name="l00180"></a>00180 <span class="keywordtype">void</span> QwtPaintBuffer::close()
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<a name="l00181"></a>00181 {
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<a name="l00182"></a>00182 flush();
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<a name="l00183"></a>00183
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<a name="l00184"></a>00184 <span class="keywordflow">if</span> ( d_painter )
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<a name="l00185"></a>00185 {
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<a name="l00186"></a>00186 <span class="keywordflow">if</span> ( d_painter->isActive() )
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<a name="l00187"></a>00187 d_painter->end();
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<a name="l00188"></a>00188
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<a name="l00189"></a>00189 <span class="keywordflow">if</span> ( d_painter != d_devicePainter )
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<a name="l00190"></a>00190 <span class="keyword">delete</span> d_painter;
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<a name="l00191"></a>00191 }
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<a name="l00192"></a>00192
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<a name="l00193"></a>00193 <span class="keywordflow">if</span> ( !d_pixBuffer.isNull() )
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<a name="l00194"></a>00194 d_pixBuffer = QPixmap();
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<a name="l00195"></a>00195
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<a name="l00196"></a>00196 d_device = 0;
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<a name="l00197"></a>00197 d_painter = 0;
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<a name="l00198"></a>00198 d_devicePainter = 0;
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<a name="l00199"></a>00199 }
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<a name="l00200"></a>00200
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<a name="l00201"></a>00201 <span class="preprocessor">#endif // QT_VERSION < 0x040000</span>
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</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sat May 24 18:47:39 2008 for Qwt User's Guide by
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.0 </small></address>
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