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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Wt: Wt::WLayoutItem Class Reference</title>
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<h1>Wt::WLayoutItem Class Reference</h1><!-- doxytag: class="Wt::WLayoutItem" -->An abstract base class for items that can participate in a layout.  
<a href="#_details">More...</a>
<p>
<code>#include &lt;Wt/WLayoutItem&gt;</code>
<p>
<div class="dynheader">
Inheritance diagram for Wt::WLayoutItem:</div>
<div class="dynsection">
<p><center><img src="classWt_1_1WLayoutItem__inherit__graph.png" border="0" usemap="#Wt_1_1WLayoutItem__inherit__map" alt="Inheritance graph"></center>
<map name="Wt_1_1WLayoutItem__inherit__map">
<area shape="rect" href="classWt_1_1WLayout.html" title="An abstract base class for layout managers." alt="" coords="327,80,423,107"><area shape="rect" href="classWt_1_1WWidgetItem.html" title="A layout item that holds a single widget." alt="" coords="447,80,569,107"><area shape="rect" href="classWt_1_1WBorderLayout.html" title="A layout manager which divides the container region in five regions." alt="" coords="5,155,139,181"><area shape="rect" href="classWt_1_1WBoxLayout.html" title="A layout manager which arranges widgets horizontally or vertically." alt="" coords="163,155,283,181"><area shape="rect" href="classWt_1_1WDefaultLayout.html" title="A default layout manager." alt="" coords="307,155,443,181"><area shape="rect" href="classWt_1_1WFitLayout.html" title="A layout manager which spans a single widget to all available space." alt="" coords="467,155,579,181"><area shape="rect" href="classWt_1_1WGridLayout.html" title="A layout manager which arranges widgets in a grid." alt="" coords="603,155,723,181"><area shape="rect" href="classWt_1_1WHBoxLayout.html" title="A layout manager which arranges widgets horizontally." alt="" coords="7,229,135,256"><area shape="rect" href="classWt_1_1WVBoxLayout.html" title="A layout manager which arranges widgets vertically." alt="" coords="159,229,287,256"><area shape="rect" href="classWt_1_1WAccordionLayout.html" title="A layout manager which shows one item at a time." alt="" coords="311,229,463,256"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>

<p>
<a href="classWt_1_1WLayoutItem-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="40dd93ac8deba8535e0e5e6645f64ad4"></a><!-- doxytag: member="Wt::WLayoutItem::~WLayoutItem" ref="40dd93ac8deba8535e0e5e6645f64ad4" args="()" -->
virtual&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#40dd93ac8deba8535e0e5e6645f64ad4">~WLayoutItem</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Destructor. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WWidgetItem.html">WWidgetItem</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#95f14880009c9121d2f2d06cdf3204f0">findWidgetItem</a> (<a class="el" href="classWt_1_1WWidget.html">WWidget</a> *widget)=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Finds the widget item corresponding to the given <em>widget</em>.  <a href="#95f14880009c9121d2f2d06cdf3204f0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WLayout.html">WLayout</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#3f81b4d198401ae493276a61be6784cf">layout</a> ()=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Returns the layout that implements this <a class="el" href="classWt_1_1WLayoutItem.html" title="An abstract base class for items that can participate in a layout.">WLayoutItem</a>.  <a href="#3f81b4d198401ae493276a61be6784cf"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WWidget.html">WWidget</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#06b127060eaf8a0b87a994b483d493e1">widget</a> ()=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Returns the widget that is held by this <a class="el" href="classWt_1_1WLayoutItem.html" title="An abstract base class for items that can participate in a layout.">WLayoutItem</a>.  <a href="#06b127060eaf8a0b87a994b483d493e1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="05a18a6a59ef9e36bcb5d47199b18ba1"></a><!-- doxytag: member="Wt::WLayoutItem::parentLayout" ref="05a18a6a59ef9e36bcb5d47199b18ba1" args="() const =0" -->
virtual <a class="el" href="classWt_1_1WLayout.html">WLayout</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#05a18a6a59ef9e36bcb5d47199b18ba1">parentLayout</a> () const =0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Returns the layout in which this item is contained. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WLayoutItemImpl.html">WLayoutItemImpl</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#b2f17122cf9589657bc0e6fa5e3ea560">impl</a> () const =0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Returns the implementation for this layout item.  <a href="#b2f17122cf9589657bc0e6fa5e3ea560"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Private Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="fa925f04082f2905b1487824d377b39f"></a><!-- doxytag: member="Wt::WLayoutItem::setParent" ref="fa925f04082f2905b1487824d377b39f" args="(WWidget *parent)=0" -->
virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#fa925f04082f2905b1487824d377b39f">setParent</a> (<a class="el" href="classWt_1_1WWidget.html">WWidget</a> *parent)=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Internal method. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="d810fbebeb2dce998e538eb31c060430"></a><!-- doxytag: member="Wt::WLayoutItem::setParentLayout" ref="d810fbebeb2dce998e538eb31c060430" args="(WLayout *parentLayout)=0" -->
virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayoutItem.html#d810fbebeb2dce998e538eb31c060430">setParentLayout</a> (<a class="el" href="classWt_1_1WLayout.html">WLayout</a> *parentLayout)=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Internal method. <br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
An abstract base class for items that can participate in a layout. 
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html" title="An abstract base class for layout managers.">WLayout</a> </dd></dl>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="95f14880009c9121d2f2d06cdf3204f0"></a><!-- doxytag: member="Wt::WLayoutItem::findWidgetItem" ref="95f14880009c9121d2f2d06cdf3204f0" args="(WWidget *widget)=0" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">virtual <a class="el" href="classWt_1_1WWidgetItem.html">WWidgetItem</a>* Wt::WLayoutItem::findWidgetItem           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classWt_1_1WWidget.html">WWidget</a> *&nbsp;</td>
          <td class="paramname"> <em>widget</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [pure virtual]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Finds the widget item corresponding to the given <em>widget</em>. 
<p>
The widget is searched for recursively inside nested layouts. 
<p>Implemented in <a class="el" href="classWt_1_1WLayout.html#af26f397f48824ed1e359d6a603eebe8">Wt::WLayout</a>, and <a class="el" href="classWt_1_1WWidgetItem.html#997b036f16e7667db3f8c59e310ad98c">Wt::WWidgetItem</a>.</p>

</div>
</div><p>
<a class="anchor" name="3f81b4d198401ae493276a61be6784cf"></a><!-- doxytag: member="Wt::WLayoutItem::layout" ref="3f81b4d198401ae493276a61be6784cf" args="()=0" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">virtual <a class="el" href="classWt_1_1WLayout.html">WLayout</a>* Wt::WLayoutItem::layout           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [pure virtual]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Returns the layout that implements this <a class="el" href="classWt_1_1WLayoutItem.html" title="An abstract base class for items that can participate in a layout.">WLayoutItem</a>. 
<p>
This implements a type-safe upcasting mechanism to a <a class="el" href="classWt_1_1WLayout.html" title="An abstract base class for layout managers.">WLayout</a>. 
<p>Implemented in <a class="el" href="classWt_1_1WLayout.html#82078a08c5a21aa67bd5a83c377d437d">Wt::WLayout</a>, and <a class="el" href="classWt_1_1WWidgetItem.html#eec342fa9330656ade0094be78d5fa34">Wt::WWidgetItem</a>.</p>

</div>
</div><p>
<a class="anchor" name="06b127060eaf8a0b87a994b483d493e1"></a><!-- doxytag: member="Wt::WLayoutItem::widget" ref="06b127060eaf8a0b87a994b483d493e1" args="()=0" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">virtual <a class="el" href="classWt_1_1WWidget.html">WWidget</a>* Wt::WLayoutItem::widget           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [pure virtual]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Returns the widget that is held by this <a class="el" href="classWt_1_1WLayoutItem.html" title="An abstract base class for items that can participate in a layout.">WLayoutItem</a>. 
<p>
This implements a type-safe upcasting mechanism to a <a class="el" href="classWt_1_1WWidgetItem.html" title="A layout item that holds a single widget.">WWidgetItem</a>. 
<p>Implemented in <a class="el" href="classWt_1_1WLayout.html#da2f5beaa8a0153451ba55581ea9bbf8">Wt::WLayout</a>, and <a class="el" href="classWt_1_1WWidgetItem.html#5f1319ce853b78703399d6d80748ef52">Wt::WWidgetItem</a>.</p>

</div>
</div><p>
<a class="anchor" name="b2f17122cf9589657bc0e6fa5e3ea560"></a><!-- doxytag: member="Wt::WLayoutItem::impl" ref="b2f17122cf9589657bc0e6fa5e3ea560" args="() const =0" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">virtual <a class="el" href="classWt_1_1WLayoutItemImpl.html">WLayoutItemImpl</a>* Wt::WLayoutItem::impl           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td> const<code> [pure virtual]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Returns the implementation for this layout item. 
<p>
The implementation of a layout item depends on the kind of container for which the layout does layout management. 
<p>Implemented in <a class="el" href="classWt_1_1WLayout.html#eb31f2caad3ed9b1ab2b06327cc92bb2">Wt::WLayout</a>, and <a class="el" href="classWt_1_1WWidgetItem.html#d17fab03e099007600e9d39dd017b9b4">Wt::WWidgetItem</a>.</p>

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