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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_text_engine.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_text_engine.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) 2003 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 <span class="comment">// vim: expandtab</span><a name="l00011"></a>00011 <a name="l00012"></a>00012 <span class="preprocessor">#include <qpainter.h></span><a name="l00013"></a>00013 <span class="preprocessor">#include <qpixmap.h></span><a name="l00014"></a>00014 <span class="preprocessor">#include <qimage.h></span><a name="l00015"></a>00015 <span class="preprocessor">#include <qmap.h></span><a name="l00016"></a>00016 <span class="preprocessor">#include <qwidget.h></span><a name="l00017"></a>00017 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00018"></a>00018 <span class="preprocessor">#include "qwt_painter.h"</span><a name="l00019"></a>00019 <span class="preprocessor">#include "qwt_text_engine.h"</span><a name="l00020"></a>00020 <a name="l00021"></a>00021 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00022"></a>00022 <span class="preprocessor"></span><a name="l00023"></a>00023 <span class="preprocessor">#include <qsimplerichtext.h></span><a name="l00024"></a>00024 <span class="preprocessor">#include <qstylesheet.h></span><a name="l00025"></a>00025 <a name="l00026"></a>00026 <span class="keyword">class </span>QwtRichTextDocument: <span class="keyword">public</span> QSimpleRichText<a name="l00027"></a>00027 {<a name="l00028"></a>00028 <span class="keyword">public</span>:<a name="l00029"></a>00029 QwtRichTextDocument(<span class="keyword">const</span> QString &text, <span class="keyword">const</span> QFont &font):<a name="l00030"></a>00030 QSimpleRichText(text, font)<a name="l00031"></a>00031 {<a name="l00032"></a>00032 }<a name="l00033"></a>00033 };<a name="l00034"></a>00034 <a name="l00035"></a>00035 <span class="preprocessor">#else // QT_VERSION >= 0x040000</span><a name="l00036"></a>00036 <span class="preprocessor"></span><a name="l00037"></a>00037 <span class="preprocessor">#if QT_VERSION < 0x040200</span><a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#define USE_LABEL 1</span><a name="l00039"></a>00039 <span class="preprocessor"></span><span class="preprocessor">#endif</span><a name="l00040"></a>00040 <span class="preprocessor"></span><a name="l00041"></a>00041 <span class="preprocessor">#ifdef USE_LABEL</span><a name="l00042"></a>00042 <span class="preprocessor"></span><span class="preprocessor">#include <qlabel.h></span><a name="l00043"></a>00043 <span class="preprocessor">#else</span><a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor">#include <qtextobject.h></span><a name="l00045"></a>00045 <span class="preprocessor">#endif</span><a name="l00046"></a>00046 <span class="preprocessor"></span><span class="preprocessor">#include <qtextdocument.h></span><a name="l00047"></a>00047 <span class="preprocessor">#include <qabstracttextdocumentlayout.h></span><a name="l00048"></a>00048 <a name="l00049"></a>00049 <span class="keyword">class </span>QwtRichTextDocument: <span class="keyword">public</span> QTextDocument<a name="l00050"></a>00050 {<a name="l00051"></a>00051 <span class="keyword">public</span>:<a name="l00052"></a>00052 QwtRichTextDocument(<span class="keyword">const</span> QString &text, <span class="keyword">const</span> QFont &font)<a name="l00053"></a>00053 {<a name="l00054"></a>00054 setUndoRedoEnabled(<span class="keyword">false</span>);<a name="l00055"></a>00055 setDefaultFont(font);<a name="l00056"></a>00056 setHtml(text);<a name="l00057"></a>00057 <a name="l00058"></a>00058 <span class="comment">// make sure we have a document layout</span><a name="l00059"></a>00059 (void)documentLayout();<a name="l00060"></a>00060 }<a name="l00061"></a>00061 };<a name="l00062"></a>00062 <a name="l00063"></a>00063 <span class="preprocessor">#endif</span><a name="l00064"></a>00064 <span class="preprocessor"></span><a name="l00065"></a>00065 <span class="keyword">class </span>QwtPlainTextEngine::PrivateData<a name="l00066"></a>00066 {<a name="l00067"></a>00067 <span class="keyword">public</span>:<a name="l00068"></a>00068 <span class="keywordtype">int</span> effectiveAscent(<span class="keyword">const</span> QFont &font)<span class="keyword"> const</span><a name="l00069"></a>00069 <span class="keyword"> </span>{<a name="l00070"></a>00070 <span class="keyword">const</span> QString fontKey = font.key();<a name="l00071"></a>00071 <a name="l00072"></a>00072 QMap<QString, int>::const_iterator it = <a name="l00073"></a>00073 d_ascentCache.find(fontKey);<a name="l00074"></a>00074 <span class="keywordflow">if</span> ( it == d_ascentCache.end() )<a name="l00075"></a>00075 {<a name="l00076"></a>00076 <span class="keywordtype">int</span> ascent = findAscent(font);<a name="l00077"></a>00077 it = d_ascentCache.insert(fontKey, ascent);<a name="l00078"></a>00078 }<a name="l00079"></a>00079 <a name="l00080"></a>00080 <span class="keywordflow">return</span> (*it);<a name="l00081"></a>00081 }<a name="l00082"></a>00082 <a name="l00083"></a>00083 <span class="keyword">private</span>:<a name="l00084"></a>00084 <span class="keywordtype">int</span> findAscent(<span class="keyword">const</span> QFont &font)<span class="keyword"> const</span><a name="l00085"></a>00085 <span class="keyword"> </span>{<a name="l00086"></a>00086 <span class="keyword">static</span> <span class="keyword">const</span> QString dummy(<span class="stringliteral">"E"</span>);<a name="l00087"></a>00087 <span class="keyword">static</span> <span class="keyword">const</span> QColor white(Qt::white);<a name="l00088"></a>00088 <a name="l00089"></a>00089 <span class="keyword">const</span> QFontMetrics fm(font);<a name="l00090"></a>00090 QPixmap pm(fm.width(dummy), fm.height()); <a name="l00091"></a>00091 pm.fill(white);<a name="l00092"></a>00092 <a name="l00093"></a>00093 QPainter p(&pm);<a name="l00094"></a>00094 p.setFont(font); <a name="l00095"></a>00095 p.drawText(0, 0, pm.width(), pm.height(), 0, dummy);<a name="l00096"></a>00096 p.end();<a name="l00097"></a>00097 <a name="l00098"></a>00098 <span class="preprocessor"> #if QT_VERSION < 0x040000</span><a name="l00099"></a>00099 <span class="preprocessor"></span> <span class="keyword">const</span> QImage img = pm.convertToImage();<a name="l00100"></a>00100 <span class="preprocessor"> #else</span><a name="l00101"></a>00101 <span class="preprocessor"></span> <span class="keyword">const</span> QImage img = pm.toImage();<a name="l00102"></a>00102 <span class="preprocessor"> #endif</span><a name="l00103"></a>00103 <span class="preprocessor"></span><a name="l00104"></a>00104 <span class="keywordtype">int</span> row = 0;<a name="l00105"></a>00105 <span class="keywordflow">for</span> ( row = 0; row < img.height(); row++ )<a name="l00106"></a>00106 { <a name="l00107"></a>00107 <span class="keyword">const</span> QRgb *line = (<span class="keyword">const</span> QRgb *)img.scanLine(row);<a name="l00108"></a>00108 <a name="l00109"></a>00109 <span class="keyword">const</span> <span class="keywordtype">int</span> w = pm.width();<a name="l00110"></a>00110 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> col = 0; col < w; col++ )<a name="l00111"></a>00111 { <a name="l00112"></a>00112 <span class="keywordflow">if</span> ( line[col] != white.rgb() )<a name="l00113"></a>00113 <span class="keywordflow">return</span> fm.ascent() - row + 1;<a name="l00114"></a>00114 }<a name="l00115"></a>00115 }<a name="l00116"></a>00116 <a name="l00117"></a>00117 <span class="keywordflow">return</span> fm.ascent();<a name="l00118"></a>00118 } <a name="l00119"></a>00119 <a name="l00120"></a>00120 <span class="keyword">mutable</span> QMap<QString, int> d_ascentCache;<a name="l00121"></a>00121 };<a name="l00122"></a>00122 <a name="l00124"></a><a class="code" href="class_qwt_text_engine.html#97c5ef76ee920ab0f19e178e85017d9d">00124</a> <a class="code" href="class_qwt_text_engine.html#97c5ef76ee920ab0f19e178e85017d9d">QwtTextEngine::QwtTextEngine</a>()<a name="l00125"></a>00125 {<a name="l00126"></a>00126 }<a name="l00127"></a>00127 <a name="l00129"></a><a class="code" href="class_qwt_text_engine.html#dda9e23494429c54b3cc3452940fb2bc">00129</a> <a class="code" href="class_qwt_text_engine.html#dda9e23494429c54b3cc3452940fb2bc">QwtTextEngine::~QwtTextEngine</a>()<a name="l00130"></a>00130 {<a name="l00131"></a>00131 }<a name="l00132"></a>00132 <a name="l00134"></a><a class="code" href="class_qwt_plain_text_engine.html#0ad29b2229a879afe49b546704eb7079">00134</a> <a class="code" href="class_qwt_plain_text_engine.html#0ad29b2229a879afe49b546704eb7079">QwtPlainTextEngine::QwtPlainTextEngine</a>()<a name="l00135"></a>00135 {<a name="l00136"></a>00136 d_data = <span class="keyword">new</span> PrivateData;<a name="l00137"></a>00137 }<a name="l00138"></a>00138 <a name="l00140"></a><a class="code" href="class_qwt_plain_text_engine.html#0ada8796b2caaff7bb8d61e9fb1b5143">00140</a> <a class="code" href="class_qwt_plain_text_engine.html#0ada8796b2caaff7bb8d61e9fb1b5143">QwtPlainTextEngine::~QwtPlainTextEngine</a>()<a name="l00141"></a>00141 {<a name="l00142"></a>00142 <span class="keyword">delete</span> d_data;<a name="l00143"></a>00143 }<a name="l00144"></a>00144 <a name="l00155"></a><a class="code" href="class_qwt_plain_text_engine.html#167f419dc7a3a172b59f78c9f480fd0d">00155</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_plain_text_engine.html#167f419dc7a3a172b59f78c9f480fd0d">QwtPlainTextEngine::heightForWidth</a>(<span class="keyword">const</span> QFont& font, <span class="keywordtype">int</span> flags,<a name="l00156"></a>00156 <span class="keyword">const</span> QString& text, <span class="keywordtype">int</span> width)<span class="keyword"> const</span><a name="l00157"></a>00157 <span class="keyword"></span>{<a name="l00158"></a>00158 <span class="keyword">const</span> QFontMetrics fm(font);<a name="l00159"></a>00159 <span class="keyword">const</span> QRect rect = fm.boundingRect(<a name="l00160"></a>00160 0, 0, width, QWIDGETSIZE_MAX, flags, text);<a name="l00161"></a>00161 <a name="l00162"></a>00162 <span class="keywordflow">return</span> rect.height();<a name="l00163"></a>00163 }<a name="l00164"></a>00164 <a name="l00174"></a><a class="code" href="class_qwt_plain_text_engine.html#3d6bd4659b061733ddfd9b3915077b75">00174</a> QSize <a class="code" href="class_qwt_plain_text_engine.html#3d6bd4659b061733ddfd9b3915077b75">QwtPlainTextEngine::textSize</a>(<span class="keyword">const</span> QFont &font,<a name="l00175"></a>00175 <span class="keywordtype">int</span> flags, <span class="keyword">const</span> QString& text)<span class="keyword"> const</span><a name="l00176"></a>00176 <span class="keyword"></span>{⌨️ 快捷键说明
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