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<h1>qwt_legend.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="comment">// vim: expandtab</span>
00011 
00012 <span class="preprocessor">#include &lt;qapplication.h&gt;</span> 
00013 <span class="preprocessor">#include &lt;qpainter.h&gt;</span>
00014 <span class="preprocessor">#include &lt;qbitmap.h&gt;</span>
00015 <span class="preprocessor">#include &lt;qstyle.h&gt;</span>
00016 <span class="preprocessor">#include "qwt_text.h"</span>
00017 <span class="preprocessor">#include "qwt_legend.h"</span>
00018 <span class="preprocessor">#include "qwt_painter.h"</span>
00019 <span class="preprocessor">#include "qwt_dyngrid_layout.h"</span>
00020 
00021 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> IdentifierWidth = 8;
00022 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> Margin = 2;
00023 
<a name="l00025"></a><a class="code" href="class_qwt_legend_item.html#a0">00025</a> <a class="code" href="class_qwt_legend_item.html#a0">QwtLegendItem::QwtLegendItem</a>():
00026     d_identifierMode(ShowLine | ShowText),
00027     d_curvePen(Qt::NoPen)
00028 {
00029 }
00030 
<a name="l00036"></a><a class="code" href="class_qwt_legend_item.html#a1">00036</a> <a class="code" href="class_qwt_legend_item.html#a0">QwtLegendItem::QwtLegendItem</a>(<span class="keyword">const</span> <a class="code" href="class_qwt_symbol.html">QwtSymbol</a> &amp;symbol, <span class="keyword">const</span> QPen &amp;curvePen):
00037     d_identifierMode(ShowLine | ShowText),
00038     d_symbol(symbol),
00039     d_curvePen(curvePen)
00040 {
00041 }
00042 
<a name="l00044"></a><a class="code" href="class_qwt_legend_item.html#a2">00044</a> <a class="code" href="class_qwt_legend_item.html#a2">QwtLegendItem::~QwtLegendItem</a>()
00045 {
00046 }
00047 
<a name="l00055"></a><a class="code" href="class_qwt_legend_item.html#a3">00055</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_item.html#a3">QwtLegendItem::setIdentifierMode</a>(<span class="keywordtype">int</span> mode) 
00056 {
00057     <span class="keywordflow">if</span> ( mode != d_identifierMode )
00058     {
00059         d_identifierMode = mode;
00060         <a class="code" href="class_qwt_legend_item.html#b1">updateItem</a>();
00061     }
00062 }
00063 
<a name="l00068"></a><a class="code" href="class_qwt_legend_item.html#a4">00068</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_legend_item.html#a4">QwtLegendItem::identifierMode</a>()<span class="keyword"> const </span>
00069 <span class="keyword"></span>{ 
00070     <span class="keywordflow">return</span> d_identifierMode; 
00071 }
00072 
<a name="l00079"></a><a class="code" href="class_qwt_legend_item.html#a5">00079</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_item.html#a5">QwtLegendItem::setSymbol</a>(<span class="keyword">const</span> <a class="code" href="class_qwt_symbol.html">QwtSymbol</a> &amp;symbol) 
00080 {
00081     <span class="keywordflow">if</span> ( symbol != d_symbol )
00082     {
00083         d_symbol = symbol;
00084         <a class="code" href="class_qwt_legend_item.html#b1">updateItem</a>();
00085     }
00086 }
00087     
<a name="l00092"></a><a class="code" href="class_qwt_legend_item.html#a6">00092</a> <span class="keyword">const</span> <a class="code" href="class_qwt_symbol.html">QwtSymbol</a>&amp; <a class="code" href="class_qwt_legend_item.html#a6">QwtLegendItem::symbol</a>()<span class="keyword"> const </span>
00093 <span class="keyword"></span>{ 
00094     <span class="keywordflow">return</span> d_symbol; 
00095 }
00096     
00097 
<a name="l00104"></a><a class="code" href="class_qwt_legend_item.html#a7">00104</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_item.html#a7">QwtLegendItem::setCurvePen</a>(<span class="keyword">const</span> QPen &amp;pen) 
00105 {
00106     <span class="keywordflow">if</span> ( pen != d_curvePen )
00107     {
00108         d_curvePen = pen;
00109         <a class="code" href="class_qwt_legend_item.html#b1">updateItem</a>();
00110     }
00111 }
00112 
<a name="l00117"></a><a class="code" href="class_qwt_legend_item.html#a8">00117</a> <span class="keyword">const</span> QPen&amp; <a class="code" href="class_qwt_legend_item.html#a8">QwtLegendItem::curvePen</a>()<span class="keyword"> const </span>
00118 <span class="keyword"></span>{ 
00119     <span class="keywordflow">return</span> d_curvePen; 
00120 }
00121 
<a name="l00123"></a><a class="code" href="class_qwt_legend_item.html#b1">00123</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_item.html#b1">QwtLegendItem::updateItem</a>()
00124 {
00125 }
00126 
<a name="l00132"></a><a class="code" href="class_qwt_legend_item.html#a9">00132</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_item.html#a9">QwtLegendItem::drawIdentifier</a>(
00133     QPainter *painter, <span class="keyword">const</span> QRect &amp;rect)<span class="keyword"> const</span>
00134 <span class="keyword"></span>{
00135     <span class="keywordflow">if</span> ( rect.isEmpty() )
00136         <span class="keywordflow">return</span>;
00137 
00138     <span class="keywordflow">if</span> ( (d_identifierMode &amp; ShowLine ) &amp;&amp; (d_curvePen.style() != Qt::NoPen) )
00139     {
00140         painter-&gt;save();
00141         painter-&gt;setPen(d_curvePen);
00142         <a class="code" href="class_qwt_painter.html#e16">QwtPainter::drawLine</a>(painter, rect.left(), rect.center().y(), 
00143             rect.right(), rect.center().y());
00144         painter-&gt;restore();
00145     }
00146 
00147     <span class="keywordflow">if</span> ( (d_identifierMode &amp; ShowSymbol) 
00148         &amp;&amp; (d_symbol.<a class="code" href="class_qwt_symbol.html#a13">style</a>() != QwtSymbol::None) )
00149     {
00150         QSize symbolSize = 
00151             <a class="code" href="class_qwt_painter.html#e3">QwtPainter::metricsMap</a>().screenToLayout(d_symbol.<a class="code" href="class_qwt_symbol.html#a12">size</a>());
00152 
00153         <span class="comment">// scale the symbol size down if it doesn't fit into rect.</span>
00154 
00155         <span class="keywordflow">if</span> ( rect.width() &lt; symbolSize.width() )
00156         {
00157             <span class="keyword">const</span> <span class="keywordtype">double</span> ratio = 
00158                 double(symbolSize.width()) / double(rect.width());
00159             symbolSize.setWidth(rect.width());
00160             symbolSize.setHeight(qRound(symbolSize.height() / ratio));
00161         }
00162         <span class="keywordflow">if</span> ( rect.height() &lt; symbolSize.height() )
00163         {
00164             <span class="keyword">const</span> <span class="keywordtype">double</span> ratio = 
00165                 double(symbolSize.width()) / double(rect.width());
00166             symbolSize.setHeight(rect.height());
00167             symbolSize.setWidth(qRound(symbolSize.width() / ratio));
00168         }
00169 
00170         QRect symbolRect;
00171         symbolRect.setSize(symbolSize);
00172         symbolRect.moveCenter(rect.center());
00173 
00174         painter-&gt;save();
00175         painter-&gt;setBrush(d_symbol.<a class="code" href="class_qwt_symbol.html#a10">brush</a>());
00176         painter-&gt;setPen(d_symbol.<a class="code" href="class_qwt_symbol.html#a11">pen</a>());
00177         d_symbol.<a class="code" href="class_qwt_symbol.html#a14">draw</a>(painter, symbolRect);
00178         painter-&gt;restore();
00179     }
00180 }
00181 
<a name="l00188"></a><a class="code" href="class_qwt_legend_item.html#a10">00188</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_item.html#a10">QwtLegendItem::drawItem</a>(QPainter *painter, <span class="keyword">const</span> QRect &amp;rect)<span class="keyword"> const</span>
00189 <span class="keyword"></span>{
00190     <span class="keyword">const</span> QwtMetricsMap &amp;map = <a class="code" href="class_qwt_painter.html#e3">QwtPainter::metricsMap</a>();
00191 
00192     <span class="keyword">const</span> <span class="keywordtype">int</span> margin = map.screenToLayoutX(Margin);
00193 
00194     <span class="keyword">const</span> QRect identifierRect(rect.x() + margin, rect.y(), 
00195         map.screenToLayoutX(IdentifierWidth), rect.height());
00196     <a class="code" href="class_qwt_legend_item.html#a9">drawIdentifier</a>(painter, identifierRect);
00197 
00198     <span class="comment">// Label</span>
00199 
00200     <a class="code" href="class_qwt_text.html">QwtText</a> *txt = titleText();
00201     <span class="keywordflow">if</span> ( txt )
00202     {
00203         QRect titleRect = rect;
00204         titleRect.setX(identifierRect.right() + 2 * margin);
00205      
00206         txt-&gt;<a class="code" href="class_qwt_text.html#a18">draw</a>(painter, titleRect);
00207         <span class="keyword">delete</span> txt;
00208     }
00209 }
00210 
00211 
<a name="l00216"></a><a class="code" href="class_qwt_legend_button.html#a0">00216</a> <a class="code" href="class_qwt_legend_button.html#a0">QwtLegendButton::QwtLegendButton</a>(QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name): 
00217     <a class="code" href="class_qwt_push_button.html">QwtPushButton</a>(parent, name)
00218 {
00219     init();
00220 }
00221     
<a name="l00229"></a><a class="code" href="class_qwt_legend_button.html#a1">00229</a> <a class="code" href="class_qwt_legend_button.html#a0">QwtLegendButton::QwtLegendButton</a>(
00230         <span class="keyword">const</span> <a class="code" href="class_qwt_symbol.html">QwtSymbol</a> &amp;symbol, <span class="keyword">const</span> QPen &amp;curvePen, <span class="keyword">const</span> QString &amp;text,
00231         QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name): 
00232     <a class="code" href="class_qwt_push_button.html">QwtPushButton</a>(text, parent, name),
00233     <a class="code" href="class_qwt_legend_item.html">QwtLegendItem</a>(symbol, curvePen)
00234 {
00235     init();
00236 }
00237 
00238 <span class="keywordtype">void</span> QwtLegendButton::init()
00239 {
00240     setFlat(TRUE);
00241     <a class="code" href="class_qwt_push_button.html#a7">setAlignment</a>(Qt::AlignLeft | Qt::AlignVCenter | 
00242         Qt::ExpandTabs | Qt::WordBreak);
00243     <a class="code" href="class_qwt_push_button.html#a8">setIndent</a>(2 * Margin);
00244     <a class="code" href="class_qwt_legend_button.html#b2">updateIconset</a>();
00245 }
00246 
<a name="l00247"></a><a class="code" href="class_qwt_legend_button.html#b1">00247</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_button.html#b1">QwtLegendButton::updateItem</a>()
00248 {
00249     <a class="code" href="class_qwt_legend_button.html#b2">updateIconset</a>();
00250 }
00251 
<a name="l00255"></a><a class="code" href="class_qwt_legend_button.html#b2">00255</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_button.html#b2">QwtLegendButton::updateIconset</a>()
00256 {
00257     <span class="keyword">const</span> QFontMetrics fm(font());
00258 
00259     QPixmap pm(IdentifierWidth, fm.height());
00260     pm.fill(<span class="keyword">this</span>, 0, 0);
00261 
00262     QPainter p(&amp;pm);
00263     <a class="code" href="class_qwt_legend_item.html#a9">drawIdentifier</a>(&amp;p, QRect(0, 0, pm.width(), pm.height()) );
00264     p.end();
00265 
00266     pm.setMask(pm.createHeuristicMask());
00267 
00268     setIconSet(QIconSet(pm));
00269 }
00270 
<a name="l00277"></a><a class="code" href="class_qwt_legend_button.html#a2">00277</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_button.html#a2">QwtLegendButton::setTitle</a>(<span class="keyword">const</span> QString &amp;title)
00278 {
00279     setText(title);
00280 }
00281 
<a name="l00286"></a><a class="code" href="class_qwt_legend_button.html#a3">00286</a> QString <a class="code" href="class_qwt_legend_button.html#a3">QwtLegendButton::title</a>()<span class="keyword"> const</span>
00287 <span class="keyword"></span>{
00288     <span class="keywordflow">return</span> text();
00289 }
00290 
<a name="l00295"></a><a class="code" href="class_qwt_legend_button.html#b0">00295</a> <a class="code" href="class_qwt_text.html">QwtText</a> *<a class="code" href="class_qwt_legend_button.html#b0">QwtLegendButton::titleText</a>()<span class="keyword"> const</span>
00296 <span class="keyword"></span>{
00297     <span class="keywordflow">return</span> <a class="code" href="class_qwt_text.html#e0">QwtText::makeText</a>(text(), <a class="code" href="class_qwt_push_button.html#a5">usedTextFormat</a>(),
00298         <a class="code" href="class_qwt_push_button.html#a6">alignment</a>(), font());
00299 }
00300 
<a name="l00305"></a><a class="code" href="class_qwt_legend_label.html#a0">00305</a> <a class="code" href="class_qwt_legend_label.html#a0">QwtLegendLabel::QwtLegendLabel</a>(QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00306     QLabel(parent, name)
00307 {
00308     init();
00309 }
00310 
<a name="l00318"></a><a class="code" href="class_qwt_legend_label.html#a1">00318</a> <a class="code" href="class_qwt_legend_label.html#a0">QwtLegendLabel::QwtLegendLabel</a>(<span class="keyword">const</span> <a class="code" href="class_qwt_symbol.html">QwtSymbol</a> &amp;symbol, 
00319         <span class="keyword">const</span> QPen &amp;curvePen, <span class="keyword">const</span> QString &amp;text, 
00320         QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00321     QLabel(text, parent, name),
00322     <a class="code" href="class_qwt_legend_item.html">QwtLegendItem</a>(symbol, curvePen)
00323 {
00324     init();
00325 }
00326 
00327 <span class="keywordtype">void</span> QwtLegendLabel::init()
00328 {
00329     setAlignment(Qt::AlignLeft | Qt::AlignVCenter | 
00330         Qt::ExpandTabs | Qt::WordBreak);
00331     setIndent(Margin + IdentifierWidth + 2 * Margin);
00332     setMargin(Margin);
00333 }
00334 
<a name="l00341"></a><a class="code" href="class_qwt_legend_label.html#a2">00341</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_label.html#a2">QwtLegendLabel::setTitle</a>(<span class="keyword">const</span> QString &amp;title)
00342 {
00343     setText(title);
00344 }
00345 
<a name="l00350"></a><a class="code" href="class_qwt_legend_label.html#a3">00350</a> QString <a class="code" href="class_qwt_legend_label.html#a3">QwtLegendLabel::title</a>()<span class="keyword"> const</span>
00351 <span class="keyword"></span>{
00352     <span class="keywordflow">return</span> text();
00353 }
00354 
<a name="l00359"></a><a class="code" href="class_qwt_legend_label.html#b0">00359</a> <a class="code" href="class_qwt_text.html">QwtText</a> *<a class="code" href="class_qwt_legend_label.html#b0">QwtLegendLabel::titleText</a>()<span class="keyword"> const</span>
00360 <span class="keyword"></span>{
00361     <span class="keywordflow">return</span> <a class="code" href="class_qwt_text.html#e0">QwtText::makeText</a>(text(), textFormat(), 
00362         alignment(), font());
00363 }
00364 
<a name="l00368"></a><a class="code" href="class_qwt_legend_label.html#b1">00368</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_label.html#b1">QwtLegendLabel::drawContents</a>(QPainter *painter)
00369 {
00370     QLabel::drawContents(painter);
00371 
00372     QRect rect = contentsRect();
00373     rect.setX(rect.x() + Margin);
00374     rect.setWidth(IdentifierWidth);
00375 
00376     <a class="code" href="class_qwt_legend_item.html#a9">drawIdentifier</a>(painter, rect);
00377 }
00378 
<a name="l00379"></a><a class="code" href="class_qwt_legend_label.html#b2">00379</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend_label.html#b2">QwtLegendLabel::updateItem</a>()
00380 {
00381     update();
00382 }
00383 
<a name="l00388"></a><a class="code" href="class_qwt_legend.html#a0">00388</a> <a class="code" href="class_qwt_legend.html#a0">QwtLegend::QwtLegend</a>(QWidget *parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name): 
00389     QScrollView(parent, name),
00390     d_readOnly(FALSE),
00391     d_displayPolicy(<a class="code" href="class_qwt_legend.html">QwtLegend</a>::Auto),
00392     d_identifierMode(<a class="code" href="class_qwt_legend_button.html">QwtLegendButton</a>::ShowLine
00393              | <a class="code" href="class_qwt_legend_button.html">QwtLegendButton</a>::ShowSymbol
00394              | <a class="code" href="class_qwt_legend_button.html">QwtLegendButton</a>::ShowText)
00395 {
00396     setFrameStyle(NoFrame);
00397     setResizePolicy(Manual);
00398 
00399     viewport()-&gt;setBackgroundMode(NoBackground); <span class="comment">// Avoid flicker</span>
00400 
00401     d_contentsWidget = <span class="keyword">new</span> QWidget(viewport());
00402     d_contentsWidget-&gt;installEventFilter(<span class="keyword">this</span>);
00403 
00404     <a class="code" href="class_qwt_dyn_grid_layout.html">QwtDynGridLayout</a> *layout = <span class="keyword">new</span> <a class="code" href="class_qwt_dyn_grid_layout.html">QwtDynGridLayout</a>(d_contentsWidget);
00405     layout-&gt;setAlignment(Qt::AlignHCenter | Qt::AlignTop);
00406     layout-&gt;setAutoAdd(TRUE);
00407 
00408     addChild(d_contentsWidget);
00409 }
00410 
<a name="l00415"></a><a class="code" href="class_qwt_legend.html#a1">00415</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend.html#a1">QwtLegend::setReadOnly</a>(<span class="keywordtype">bool</span> readOnly)
00416 {
00417     d_readOnly = readOnly;
00418 }
00419 
<a name="l00424"></a><a class="code" href="class_qwt_legend.html#a2">00424</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_legend.html#a2">QwtLegend::isReadOnly</a>()<span class="keyword"> const</span>
00425 <span class="keyword"></span>{
00426     <span class="keywordflow">return</span> d_readOnly;
00427 }
00428 
<a name="l00437"></a><a class="code" href="class_qwt_legend.html#a3">00437</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend.html#a3">QwtLegend::setDisplayPolicy</a>(LegendDisplayPolicy policy, <span class="keywordtype">int</span> mode)
00438 {
00439     d_displayPolicy = policy;
00440     <span class="keywordflow">if</span> (-1 != mode)
00441        d_identifierMode = mode;
00442 }
00443 
<a name="l00450"></a><a class="code" href="class_qwt_legend.html#a4">00450</a> <a class="code" href="class_qwt_legend.html#w3">QwtLegend::LegendDisplayPolicy</a> <a class="code" href="class_qwt_legend.html#a4">QwtLegend::displayPolicy</a>()<span class="keyword"> const </span>
00451 <span class="keyword"></span>{ 
00452     <span class="keywordflow">return</span> d_displayPolicy; 
00453 }
00454 
<a name="l00462"></a><a class="code" href="class_qwt_legend.html#a5">00462</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_legend.html#a5">QwtLegend::identifierMode</a>()<span class="keyword"> const</span>
00463 <span class="keyword"></span>{
00464     <span class="keywordflow">return</span> d_identifierMode;
00465 }
00466 
<a name="l00471"></a><a class="code" href="class_qwt_legend.html#a6">00471</a> QWidget *<a class="code" href="class_qwt_legend.html#a6">QwtLegend::contentsWidget</a>() 
00472 { 
00473     <span class="keywordflow">return</span> d_contentsWidget; 
00474 }
00475 
<a name="l00481"></a><a class="code" href="class_qwt_legend.html#a7">00481</a> <span class="keyword">const</span> QWidget *<a class="code" href="class_qwt_legend.html#a6">QwtLegend::contentsWidget</a>()<span class="keyword"> const </span>
00482 <span class="keyword"></span>{ 
00483     <span class="keywordflow">return</span> d_contentsWidget; 
00484 }
00485 
<a name="l00493"></a><a class="code" href="class_qwt_legend.html#a8">00493</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend.html#a8">QwtLegend::insertItem</a>(QWidget *item, <span class="keywordtype">long</span> key)
00494 {
00495     <span class="keywordflow">if</span> ( item == NULL || key &lt; 0 )
00496         <span class="keywordflow">return</span>;
00497 
00498     <span class="keywordflow">if</span> ( item-&gt;parent() != d_contentsWidget )
00499         item-&gt;reparent(d_contentsWidget, QPoint(0, 0));
00500 
00501     item-&gt;show();
00502 
00503     <span class="keywordflow">if</span> ( d_items.count() &gt; d_items.size() - 5 )
00504         d_items.resize(d_items.count() + 5);
00505 
00506     d_items.insert(key, item);
00507 
00508     <a class="code" href="class_qwt_legend.html#b1">layoutContents</a>();
00509 
00510     QWidget *w = 0;
00511 
00512     <span class="keywordflow">if</span> ( d_contentsWidget-&gt;layout() )
00513     {
00514         <span class="comment">// set tab focus chain</span>
00515 
00516         QLayoutIterator layoutIterator = 
00517             d_contentsWidget-&gt;layout()-&gt;iterator();
00518 
00519         <span class="keywordflow">for</span> ( QLayoutItem *item = layoutIterator.current();
00520             item != 0; item = ++layoutIterator)
00521         {
00522             <span class="keywordflow">if</span> ( w &amp;&amp; item-&gt;widget() )
00523                 QWidget::setTabOrder(w, item-&gt;widget());
00524 
00525             w = item-&gt;widget();
00526         }
00527     }
00528 }
00529 
<a name="l00531"></a><a class="code" href="class_qwt_legend.html#a9">00531</a> QWidget *<a class="code" href="class_qwt_legend.html#a9">QwtLegend::findItem</a>(<span class="keywordtype">long</span> key)
00532 {
00533     <span class="keywordflow">return</span> d_items.find(key);
00534 }
00535 
<a name="l00537"></a><a class="code" href="class_qwt_legend.html#a10">00537</a> <span class="keyword">const</span> QWidget *<a class="code" href="class_qwt_legend.html#a9">QwtLegend::findItem</a>(<span class="keywordtype">long</span> key)<span class="keyword"> const </span>
00538 <span class="keyword"></span>{ 
00539     <span class="keywordflow">return</span> d_items.find(key); 
00540 }
00541     
<a name="l00543"></a><a class="code" href="class_qwt_legend.html#a11">00543</a> QWidget *<a class="code" href="class_qwt_legend.html#a11">QwtLegend::takeItem</a>(<span class="keywordtype">long</span> key) 
00544 { 
00545     <span class="keywordflow">return</span> d_items.take(key); 
00546 }
00547 
<a name="l00553"></a><a class="code" href="class_qwt_legend.html#a13">00553</a> <span class="keywordtype">long</span> <a class="code" href="class_qwt_legend.html#a13">QwtLegend::key</a>(<span class="keyword">const</span> QWidget *item)<span class="keyword"> const</span>
00554 <span class="keyword"></span>{
00555     QWidgetIntDictIt it(d_items);
00556     <span class="keywordflow">for</span> ( <span class="keyword">const</span> QWidget *w = it.toFirst(); w != 0; w = ++it)
00557     {
00558         <span class="keywordflow">if</span> ( w == item )
00559             <span class="keywordflow">return</span> it.currentKey();
00560     }
00561     <span class="keywordflow">return</span> -1;
00562 }
00563 
<a name="l00565"></a><a class="code" href="class_qwt_legend.html#a14">00565</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend.html#a14">QwtLegend::clear</a>()
00566 {
00567     <span class="comment">// We can't delete the items while we are running</span>
00568     <span class="comment">// through the iterator. So we collect them in</span>
00569     <span class="comment">// a list first.</span>
00570 
00571     QValueList&lt;QWidget *&gt; clearList;
00572     
00573     QWidgetIntDictIt it(d_items);
00574     <span class="keywordflow">for</span> ( QWidget *item = it.toFirst(); item != 0; item = ++it)
00575         clearList += item;
00576 
00577     <span class="keywordflow">for</span> ( uint i = 0; i &lt; clearList.count(); i++ )
00578         <span class="keyword">delete</span> clearList[i];
00579 
00580 <span class="preprocessor">#if QT_VERSION &lt; 232</span>
00581 <span class="preprocessor"></span>    <span class="comment">// In Qt 2.3.0 the ChildRemoved events are not sent, before the</span>
00582     <span class="comment">// first show of the legend. Thus the deleted items are not cleared</span>
00583     <span class="comment">// from the list in QwtLegend::eventFilter. In most cases</span>
00584     <span class="comment">// the following clear is useless, but is is safe to do so.</span>
00585     
00586     d_items.clear();
00587 <span class="preprocessor">#endif</span>
00588 <span class="preprocessor"></span>}
00589 
<a name="l00591"></a><a class="code" href="class_qwt_legend.html#a12">00591</a> QWidgetIntDictIt <a class="code" href="class_qwt_legend.html#a12">QwtLegend::itemIterator</a>()<span class="keyword"> const</span>
00592 <span class="keyword"></span>{
00593     <span class="keywordflow">return</span> QWidgetIntDictIt(d_items);
00594 }
00595 
<a name="l00597"></a><a class="code" href="class_qwt_legend.html#a18">00597</a> QSize <a class="code" href="class_qwt_legend.html#a18">QwtLegend::sizeHint</a>()<span class="keyword"> const</span>
00598 <span class="keyword"></span>{
00599     QSize hint = d_contentsWidget-&gt;sizeHint();
00600     hint += QSize(2 * frameWidth(), 2 * frameWidth());
00601     
00602     <span class="keywordflow">return</span> hint;
00603 }
00604 
<a name="l00608"></a><a class="code" href="class_qwt_legend.html#a19">00608</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_legend.html#a19">QwtLegend::heightForWidth</a>(<span class="keywordtype">int</span> w)<span class="keyword"> const</span>
00609 <span class="keyword"></span>{
00610     w -= 2 * frameWidth();
00611 
00612     <span class="keywordtype">int</span> h = d_contentsWidget-&gt;heightForWidth(w);
00613     <span class="keywordflow">if</span> ( h &lt;= 0 ) <span class="comment">// not implemented, we try the layout</span>
00614     {
00615         QLayout *l = d_contentsWidget-&gt;layout();
00616         <span class="keywordflow">if</span> ( l &amp;&amp; l-&gt;hasHeightForWidth() )
00617         {
00618             h = l-&gt;heightForWidth(w);
00619             h += 2 * frameWidth();
00620         }
00621     }
00622 
00623     <span class="keywordflow">return</span> h;
00624 }
00625 
<a name="l00629"></a><a class="code" href="class_qwt_legend.html#b1">00629</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend.html#b1">QwtLegend::layoutContents</a>()
00630 {
00631     <span class="keyword">const</span> QSize visibleSize = viewport()-&gt;size();
00632 
00633     <span class="keyword">const</span> QLayout *l = d_contentsWidget-&gt;layout();
00634     <span class="keywordflow">if</span> ( l &amp;&amp; l-&gt;inherits(<span class="stringliteral">"QwtDynGridLayout"</span>) )
00635     {
00636         <span class="keyword">const</span> <a class="code" href="class_qwt_dyn_grid_layout.html">QwtDynGridLayout</a> *tl = (<span class="keyword">const</span> <a class="code" href="class_qwt_dyn_grid_layout.html">QwtDynGridLayout</a> *)l;
00637 
00638         <span class="keyword">const</span> <span class="keywordtype">int</span> minW = int(tl-&gt;<a class="code" href="class_qwt_dyn_grid_layout.html#a11">maxItemWidth</a>()) + 2 * tl-&gt;margin();
00639 
00640         <span class="keywordtype">int</span> w = QMAX(visibleSize.width(), minW);
00641         <span class="keywordtype">int</span> h = QMAX(tl-&gt;<a class="code" href="class_qwt_dyn_grid_layout.html#a14">heightForWidth</a>(w), visibleSize.height());
00642 
00643         <span class="keyword">const</span> <span class="keywordtype">int</span> vpWidth = viewportSize(w, h).width();
00644 
00645         <span class="keywordflow">if</span> ( w &gt; vpWidth )
00646         {
00647             w = QMAX(vpWidth, minW);
00648             h = QMAX(tl-&gt;<a class="code" href="class_qwt_dyn_grid_layout.html#a14">heightForWidth</a>(w), visibleSize.height());
00649         }
00650 
00651         d_contentsWidget-&gt;resize(w, h);
00652         resizeContents(w, h);
00653     }
00654 }
00655 
00656 <span class="comment">/*</span>
00657 <span class="comment">  Filter QEvent::ChildRemoved, and QEvent::LayoutHint for</span>
00658 <span class="comment">  QwtLegend::contentsWidget().</span>
00659 <span class="comment">*/</span>
00660 
<a name="l00662"></a><a class="code" href="class_qwt_legend.html#a17">00662</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_legend.html#a17">QwtLegend::eventFilter</a>(QObject *o, QEvent *e)
00663 {
00664     <span class="keywordflow">if</span> ( o == d_contentsWidget )
00665     {
00666         <span class="keywordflow">switch</span>(e-&gt;type())
00667         {
00668             <span class="keywordflow">case</span> QEvent::ChildRemoved:
00669             {   
00670                 <span class="keyword">const</span> QChildEvent *ce = (<span class="keyword">const</span> QChildEvent *)e;
00671                 <span class="keywordflow">if</span> ( ce-&gt;child()-&gt;isWidgetType() )
00672                     (<span class="keywordtype">void</span>)<a class="code" href="class_qwt_legend.html#a11">takeItem</a>(<a class="code" href="class_qwt_legend.html#a13">key</a>((QWidget *)ce-&gt;child()));
00673                 <span class="keywordflow">break</span>;
00674             }
00675             <span class="keywordflow">case</span> QEvent::LayoutHint:
00676             {
00677                 <a class="code" href="class_qwt_legend.html#b1">layoutContents</a>();
00678                 <span class="keywordflow">break</span>;
00679             }
00680             <span class="keywordflow">default</span>:
00681                 <span class="keywordflow">break</span>;
00682         }
00683     }
00684     
00685     <span class="keywordflow">return</span> QScrollView::eventFilter(o, e);
00686 }
00687 
<a name="l00692"></a><a class="code" href="class_qwt_legend.html#b0">00692</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_legend.html#b0">QwtLegend::viewportResizeEvent</a>(QResizeEvent *e)
00693 {
00694     QScrollView::viewportResizeEvent(e);
00695 
00696     <span class="comment">// It's not safe to update the layout now, because</span>
00697     <span class="comment">// we are in an internal update of the scrollview framework.</span>
00698     <span class="comment">// So we delay the update by posting a LayoutHint.</span>
00699 
00700     QApplication::postEvent(d_contentsWidget, <span class="keyword">new</span> QEvent(QEvent::LayoutHint));
00701 }
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:20 2004 for Qwt User's Guide by
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