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<div class="title">QwtAbstractLegend Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div>  </div>
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<p>Abstract base class for legend widgets.  
 <a href="class_qwt_abstract_legend.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="qwt__abstract__legend_8h_source.html">qwt_abstract_legend.h</a>&gt;</code></p>
<div class="dynheader">
Inheritance diagram for QwtAbstractLegend:</div>
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<area shape="rect" title="Abstract base class for legend widgets." alt="" coords="5,80,143,107"/>
<area shape="rect" href="class_qwt_legend.html" title="The legend widget." alt="" coords="30,155,118,181"/>
<area shape="rect" title=" " alt="" coords="39,5,109,32"/>
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<center><span class="legend">[<a target="top" href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
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Public Slots</h2></td></tr>
<tr class="memitem:aa9fc80c9e1dcbcfef51b96a3bff268ca"><td class="memItemLeft" align="right" valign="top">virtual void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_abstract_legend.html#aa9fc80c9e1dcbcfef51b96a3bff268ca">updateLegend</a> (const QVariant &amp;itemInfo, const QList&lt; <a class="el" href="class_qwt_legend_data.html">QwtLegendData</a> &gt; &amp;data)=0</td></tr>
<tr class="memdesc:aa9fc80c9e1dcbcfef51b96a3bff268ca"><td class="mdescLeft">&#160;</td><td class="mdescRight">Update the entries for a plot item.  <a href="class_qwt_abstract_legend.html#aa9fc80c9e1dcbcfef51b96a3bff268ca">More...</a><br /></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a77092d06decd579fcde5c90875c3830b"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_abstract_legend.html#a77092d06decd579fcde5c90875c3830b">QwtAbstractLegend</a> (QWidget *parent=NULL)</td></tr>
<tr class="separator:a77092d06decd579fcde5c90875c3830b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a6d86d9c50679dea9fefafc457fc70814"><td class="memItemLeft" align="right" valign="top"><a id="a6d86d9c50679dea9fefafc457fc70814"></a>
virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_abstract_legend.html#a6d86d9c50679dea9fefafc457fc70814">~QwtAbstractLegend</a> ()</td></tr>
<tr class="memdesc:a6d86d9c50679dea9fefafc457fc70814"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor. <br /></td></tr>
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<tr class="memitem:a2fe1ac5ac1448e4d86b7437505214d9c"><td class="memItemLeft" align="right" valign="top">virtual void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_abstract_legend.html#a2fe1ac5ac1448e4d86b7437505214d9c">renderLegend</a> (QPainter *painter, const QRectF &amp;rect, bool fillBackground) const =0</td></tr>
<tr class="separator:a2fe1ac5ac1448e4d86b7437505214d9c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a9904720ba92daf03d0e5d8559cc5cdfe"><td class="memItemLeft" align="right" valign="top">virtual bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_abstract_legend.html#a9904720ba92daf03d0e5d8559cc5cdfe">isEmpty</a> () const =0</td></tr>
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<tr class="memitem:a619f3705f6f9be8c1f38df68d83a37ff"><td class="memItemLeft" align="right" valign="top">virtual int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_abstract_legend.html#a619f3705f6f9be8c1f38df68d83a37ff">scrollExtent</a> (Qt::Orientation) const</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Abstract base class for legend widgets. </p>
<p>Legends, that need to be under control of the <a class="el" href="class_qwt_plot.html" title="A 2-D plotting widget.">QwtPlot</a> layout system need to be derived from <a class="el" href="class_qwt_abstract_legend.html" title="Abstract base class for legend widgets.">QwtAbstractLegend</a>.</p>
<dl class="section note"><dt>Note</dt><dd>Other type of legends can be implemented by connecting to the <a class="el" href="class_qwt_plot.html#acf7bcea83713f73e5914325c50a1c22b">QwtPlot::legendDataChanged()</a> signal. But as these legends are unknown to the plot layout system the layout code ( on screen and for <a class="el" href="class_qwt_plot_renderer.html" title="Renderer for exporting a plot to a document, a printer or anything else, that is supported by QPainte...">QwtPlotRenderer</a> ) need to be organized in application code.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_legend.html" title="The legend widget.">QwtLegend</a> </dd></dl>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
<a id="a77092d06decd579fcde5c90875c3830b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a77092d06decd579fcde5c90875c3830b">&#9670;&nbsp;</a></span>QwtAbstractLegend()</h2>

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          <td class="memname">QwtAbstractLegend::QwtAbstractLegend </td>
          <td>(</td>
          <td class="paramtype">QWidget *&#160;</td>
          <td class="paramname"><em>parent</em> = <code>NULL</code></td><td>)</td>
          <td></td>
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<span class="mlabels"><span class="mlabel">explicit</span></span>  </td>
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<p>Constructor</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">parent</td><td>Parent widget </td></tr>
  </table>
  </dd>
</dl>

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</div>
<h2 class="groupheader">Member Function Documentation</h2>
<a id="a9904720ba92daf03d0e5d8559cc5cdfe"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9904720ba92daf03d0e5d8559cc5cdfe">&#9670;&nbsp;</a></span>isEmpty()</h2>

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          <td class="memname">virtual bool QwtAbstractLegend::isEmpty </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td> const</td>
        </tr>
      </table>
  </td>
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<span class="mlabels"><span class="mlabel">pure virtual</span></span>  </td>
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<dl class="section return"><dt>Returns</dt><dd>True, when no plot item is inserted </dd></dl>

<p>Implemented in <a class="el" href="class_qwt_legend.html#aced18eb9dc01af9f89da7e52491a9ee1">QwtLegend</a>.</p>

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<a id="a2fe1ac5ac1448e4d86b7437505214d9c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2fe1ac5ac1448e4d86b7437505214d9c">&#9670;&nbsp;</a></span>renderLegend()</h2>

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          <td class="memname">virtual void QwtAbstractLegend::renderLegend </td>
          <td>(</td>
          <td class="paramtype">QPainter *&#160;</td>
          <td class="paramname"><em>painter</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const QRectF &amp;&#160;</td>
          <td class="paramname"><em>rect</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">bool&#160;</td>
          <td class="paramname"><em>fillBackground</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td> const</td>
        </tr>
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<p>Render the legend into a given rectangle.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">painter</td><td>Painter </td></tr>
    <tr><td class="paramname">rect</td><td>Bounding rectangle </td></tr>
    <tr><td class="paramname">fillBackground</td><td>When true, fill rect with the widget background</td></tr>
  </table>
  </dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_abstract_legend.html#a2fe1ac5ac1448e4d86b7437505214d9c">renderLegend()</a> is used by <a class="el" href="class_qwt_plot_renderer.html" title="Renderer for exporting a plot to a document, a printer or anything else, that is supported by QPainte...">QwtPlotRenderer</a> </dd></dl>

<p>Implemented in <a class="el" href="class_qwt_legend.html#a41c46ddb5b69ec23b76d3016a908535d">QwtLegend</a>.</p>

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<a id="a619f3705f6f9be8c1f38df68d83a37ff"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a619f3705f6f9be8c1f38df68d83a37ff">&#9670;&nbsp;</a></span>scrollExtent()</h2>

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          <td class="memname">int QwtAbstractLegend::scrollExtent </td>
          <td>(</td>
          <td class="paramtype">Qt::Orientation&#160;</td>
          <td class="paramname"><em>orientation</em></td><td>)</td>
          <td> const</td>
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<p>Return the extent, that is needed for elements to scroll the legend ( usually scrollbars ),</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">orientation</td><td>Orientation </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Extent of the corresponding scroll element </dd></dl>

<p>Reimplemented in <a class="el" href="class_qwt_legend.html#af6479d6dd8ac45142ce0da5d8be29a2a">QwtLegend</a>.</p>

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<a id="aa9fc80c9e1dcbcfef51b96a3bff268ca"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa9fc80c9e1dcbcfef51b96a3bff268ca">&#9670;&nbsp;</a></span>updateLegend</h2>

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          <td class="memname">virtual void QwtAbstractLegend::updateLegend </td>
          <td>(</td>
          <td class="paramtype">const QVariant &amp;&#160;</td>
          <td class="paramname"><em>itemInfo</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const QList&lt; <a class="el" href="class_qwt_legend_data.html">QwtLegendData</a> &gt; &amp;&#160;</td>
          <td class="paramname"><em>data</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
  </td>
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<span class="mlabels"><span class="mlabel">pure virtual</span><span class="mlabel">slot</span></span>  </td>
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<p>Update the entries for a plot item. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">itemInfo</td><td>Info about an item </td></tr>
    <tr><td class="paramname">data</td><td>List of legend entry attributes for the item </td></tr>
  </table>
  </dd>
</dl>

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