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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>Wt::WLayout Class Reference</h1><!-- doxytag: class="Wt::WLayout" --><!-- doxytag: inherits="Wt::WLayoutItem,Wt::WObject" -->An abstract base class for layout managers.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/WLayout></code>
<p>
<div class="dynheader">
Inheritance diagram for Wt::WLayout:</div>
<div class="dynsection">
<p><center><img src="classWt_1_1WLayout__inherit__graph.png" border="0" usemap="#Wt_1_1WLayout__inherit__map" alt="Inheritance graph"></center>
<map name="Wt_1_1WLayout__inherit__map">
<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_1WLayoutItem.html" title="An abstract base class for items that can participate in a layout." alt="" coords="247,5,369,32"><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="393,5,489,32"><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_1WLayout-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">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#fee1a345112b107158765695fc6837eb">~WLayout</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <a href="#fee1a345112b107158765695fc6837eb"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#d4a778298c01d290692afc77e441c629">addItem</a> (<a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> *item)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adds a layout <em>item</em>. <a href="#d4a778298c01d290692afc77e441c629"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#886d2ec4b6b97524ba3dff93252e6540">addWidget</a> (<a class="el" href="classWt_1_1WWidget.html">WWidget</a> *widget)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adds the given <em>widget</em> to the layout. <a href="#886d2ec4b6b97524ba3dff93252e6540"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#8c8d94070a51e669f8077249b67742ae">removeItem</a> (<a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> *item)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Removes a layout <em>item</em> (widget or nested layout). <a href="#8c8d94070a51e669f8077249b67742ae"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#3f5e0f62a0deb8f2473e52c5270128d5">removeWidget</a> (<a class="el" href="classWt_1_1WWidget.html">WWidget</a> *widget)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Removes the given <em>widget</em> from the layout. <a href="#3f5e0f62a0deb8f2473e52c5270128d5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#799b3cce5c1717b18e54c14471e84033">count</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the number of items in this layout. <a href="#799b3cce5c1717b18e54c14471e84033"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#3d48e5e4f56ad5d1b0e60180ebc91442">itemAt</a> (int index) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the layout item at a specific <em>index</em>. <a href="#3d48e5e4f56ad5d1b0e60180ebc91442"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#fecba709ae19b93ef9bbe167650dbc5c">indexOf</a> (<a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> *item) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the index of a given <em>item</em>. <a href="#fecba709ae19b93ef9bbe167650dbc5c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="af26f397f48824ed1e359d6a603eebe8"></a><!-- doxytag: member="Wt::WLayout::findWidgetItem" ref="af26f397f48824ed1e359d6a603eebe8" args="(WWidget *widget)" -->
virtual <a class="el" href="classWt_1_1WWidgetItem.html">WWidgetItem</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#af26f397f48824ed1e359d6a603eebe8">findWidgetItem</a> (<a class="el" href="classWt_1_1WWidget.html">WWidget</a> *widget)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Finds the widget item associated with the given <em>widget</em>. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#c8fa1927e7c9b15e3e673cbf6a473c34">setLayoutHint</a> (const std::string &name, const std::string &value)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Provides a hint to the layout implementation. <a href="#c8fa1927e7c9b15e3e673cbf6a473c34"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WWidget.html">WWidget</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#da2f5beaa8a0153451ba55581ea9bbf8">widget</a> ()</td></tr>
<tr><td class="mdescLeft"> </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="#da2f5beaa8a0153451ba55581ea9bbf8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WLayout.html">WLayout</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#82078a08c5a21aa67bd5a83c377d437d">layout</a> ()</td></tr>
<tr><td class="mdescLeft"> </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="#82078a08c5a21aa67bd5a83c377d437d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f0448e22813516009edc5555572a2043"></a><!-- doxytag: member="Wt::WLayout::parentLayout" ref="f0448e22813516009edc5555572a2043" args="() const " -->
virtual <a class="el" href="classWt_1_1WLayout.html">WLayout</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#f0448e22813516009edc5555572a2043">parentLayout</a> () const </td></tr>
<tr><td class="mdescLeft"> </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"><a class="el" href="classWt_1_1WLayoutItemImpl.html">WLayoutItemImpl</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#eb31f2caad3ed9b1ab2b06327cc92bb2">impl</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the implementation for this layout item. <a href="#eb31f2caad3ed9b1ab2b06327cc92bb2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#f18bae8c743c9f9a5cabee58826ffb45">setContentsMargins</a> (int left, int top, int right, int bottom)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set contents margins (in pixels). <a href="#f18bae8c743c9f9a5cabee58826ffb45"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#90756cc8765259a26f8d54fd4531c7b3">getContentsMargins</a> (int *left, int *top, int *right, int *bottom) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the contents margins. <a href="#90756cc8765259a26f8d54fd4531c7b3"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7ea1c353ac9d38a94ad08fc0cb8d6c25"></a><!-- doxytag: member="Wt::WLayout::WLayout" ref="7ea1c353ac9d38a94ad08fc0cb8d6c25" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#7ea1c353ac9d38a94ad08fc0cb8d6c25">WLayout</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create a layout. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#a1549c20751b9a50cbc47d3a47adcb21">update</a> (<a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> *item=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Update the layout. <a href="#a1549c20751b9a50cbc47d3a47adcb21"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#8cf7d6517ab800c975a25dfc6682c58f">updateAddItem</a> (<a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> *item)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Update the layout, adding the given layout <em>item</em>. <a href="#8cf7d6517ab800c975a25dfc6682c58f"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#31c7495263f67a4fbc8b384784af628d">updateRemoveItem</a> (<a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> *item)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Update the layout, remove the given layout <em>item</em>. <a href="#31c7495263f67a4fbc8b384784af628d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#f196e38edc970646d765f003a6cc352e">setLayoutInParent</a> (<a class="el" href="classWt_1_1WWidget.html">WWidget</a> *parent)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the layout in the <em>parent</em>. <a href="#f196e38edc970646d765f003a6cc352e"></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="c3f37ebdf9b12e078c7303990e139f9d"></a><!-- doxytag: member="Wt::WLayout::setParent" ref="c3f37ebdf9b12e078c7303990e139f9d" args="(WWidget *parent)" -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#c3f37ebdf9b12e078c7303990e139f9d">setParent</a> (<a class="el" href="classWt_1_1WWidget.html">WWidget</a> *parent)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Internal method. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="15f0f5f75cc008b12619d643153889da"></a><!-- doxytag: member="Wt::WLayout::setParentLayout" ref="15f0f5f75cc008b12619d643153889da" args="(WLayout *parentLayout)" -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLayout.html#15f0f5f75cc008b12619d643153889da">setParentLayout</a> (<a class="el" href="classWt_1_1WLayout.html">WLayout</a> *parentLayout)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Internal method. <br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
An abstract base class for layout managers.
<p>
This class is the abstract base class for any layout manager. A layout manager is associated with a container widget, and manages the layout of children inside the whole space available to the container widget.<p>
Layout managers may be used with <a class="el" href="classWt_1_1WContainerWidget.html" title="A widget that holds and manages child widgets.">WContainerWidget</a> and <a class="el" href="classWt_1_1Ext_1_1Container.html" title="A container class which manages its contents using layout managers.">Ext::Container</a> container widgets. A suitable implementation for all layout classes is not yet available for both containers, and thus you need to refer to the documentation of a layout manager to see if it is applicable to your situation.<p>
The implementation of the layout manager depends on the container widget to which it is set, and is therefore deferred to WLayoutImpl.<p>
A layout never assumes ownership of contained items, instead these are owned by the parent widget to which the layout is applied.<p>
<dl class="note" compact><dt><b>Note:</b></dt><dd>When applying a layout manager to a <a class="el" href="classWt_1_1WContainerWidget.html" title="A widget that holds and manages child widgets.">WContainerWidget</a>, you may not define any padding for the container widget. Instead, use <a class="el" href="classWt_1_1WLayout.html#f18bae8c743c9f9a5cabee58826ffb45" title="Set contents margins (in pixels).">setContentsMargins()</a>. </dd></dl>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="fee1a345112b107158765695fc6837eb"></a><!-- doxytag: member="Wt::WLayout::~WLayout" ref="fee1a345112b107158765695fc6837eb" args="()" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">Wt::WLayout::~WLayout </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Destructor.
<p>
This will delete the layout (and nested layouts), but not the contained widgets.
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="d4a778298c01d290692afc77e441c629"></a><!-- doxytag: member="Wt::WLayout::addItem" ref="d4a778298c01d290692afc77e441c629" args="(WLayoutItem *item)=0" -->
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<td class="memname">virtual void Wt::WLayout::addItem </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> * </td>
<td class="paramname"> <em>item</em> </td>
<td> ) </td>
<td><code> [pure virtual]</code></td>
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<p>
Adds a layout <em>item</em>.
<p>
The item may be a widget or nested layout.<p>
How the item is layed out with respect to siblings is implementation specific to the layout manager. In some cases, a layout manager will overload this method with extra arguments that specify layout options.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#8c8d94070a51e669f8077249b67742ae" title="Removes a layout item (widget or nested layout).">removeItem(WLayoutItem *)</a>, <a class="el" href="classWt_1_1WLayout.html#886d2ec4b6b97524ba3dff93252e6540" title="Adds the given widget to the layout.">addWidget(WWidget *)</a> </dd></dl>
<p>Implemented in <a class="el" href="classWt_1_1WBorderLayout.html#5f9a17668850dfbd4566b4351334ab48">Wt::WBorderLayout</a>, <a class="el" href="classWt_1_1WBoxLayout.html#2932a804ac01e0b314408bf4d366385d">Wt::WBoxLayout</a>, <a class="el" href="classWt_1_1WDefaultLayout.html#281200191e8568c0dd8f7f355640cfbf">Wt::WDefaultLayout</a>, <a class="el" href="classWt_1_1WFitLayout.html#c961be1e914193e5f46992ef326d0939">Wt::WFitLayout</a>, and <a class="el" href="classWt_1_1WGridLayout.html#82fb0e2743d9081893b83003d5263dbd">Wt::WGridLayout</a>.</p>
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<a class="anchor" name="886d2ec4b6b97524ba3dff93252e6540"></a><!-- doxytag: member="Wt::WLayout::addWidget" ref="886d2ec4b6b97524ba3dff93252e6540" args="(WWidget *widget)" -->
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<td class="memname">void Wt::WLayout::addWidget </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WWidget.html">WWidget</a> * </td>
<td class="paramname"> <em>widget</em> </td>
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<p>
Adds the given <em>widget</em> to the layout.
<p>
This method wraps the widget in a <a class="el" href="classWt_1_1WWidgetItem.html" title="A layout item that holds a single widget.">WWidgetItem</a> and calls <a class="el" href="classWt_1_1WLayout.html#d4a778298c01d290692afc77e441c629" title="Adds a layout item.">addItem(WLayoutItem *)</a>.<p>
How the widget is layed out with respect to siblings is implementation specific to the layout manager. In some cases, a layout manager will overload this method with extra arguments that specify layout options.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#3f5e0f62a0deb8f2473e52c5270128d5" title="Removes the given widget from the layout.">removeWidget(WWidget *)</a>, <a class="el" href="classWt_1_1WLayout.html#d4a778298c01d290692afc77e441c629" title="Adds a layout item.">addItem(WLayoutItem *)</a> </dd></dl>
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<a class="anchor" name="8c8d94070a51e669f8077249b67742ae"></a><!-- doxytag: member="Wt::WLayout::removeItem" ref="8c8d94070a51e669f8077249b67742ae" args="(WLayoutItem *item)=0" -->
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<td class="memname">virtual void Wt::WLayout::removeItem </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> * </td>
<td class="paramname"> <em>item</em> </td>
<td> ) </td>
<td><code> [pure virtual]</code></td>
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<p>
Removes a layout <em>item</em> (widget or nested layout).
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#d4a778298c01d290692afc77e441c629" title="Adds a layout item.">addItem(WLayoutItem *)</a>, <a class="el" href="classWt_1_1WLayout.html#3f5e0f62a0deb8f2473e52c5270128d5" title="Removes the given widget from the layout.">removeWidget(WWidget *)</a> </dd></dl>
<p>Implemented in <a class="el" href="classWt_1_1WBorderLayout.html#1d6703aaefe8924d71ad48dbd4b7dcab">Wt::WBorderLayout</a>, <a class="el" href="classWt_1_1WBoxLayout.html#a01f05c0f40fa89e418b802f78f2870c">Wt::WBoxLayout</a>, <a class="el" href="classWt_1_1WDefaultLayout.html#2172639feddcd11fd319eb481a5d20a6">Wt::WDefaultLayout</a>, <a class="el" href="classWt_1_1WFitLayout.html#fd4c47377c0aa0a3a55db13a0ff2bae2">Wt::WFitLayout</a>, and <a class="el" href="classWt_1_1WGridLayout.html#35a10fd71fa00cad962bd0980d9cdc00">Wt::WGridLayout</a>.</p>
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<a class="anchor" name="3f5e0f62a0deb8f2473e52c5270128d5"></a><!-- doxytag: member="Wt::WLayout::removeWidget" ref="3f5e0f62a0deb8f2473e52c5270128d5" args="(WWidget *widget)" -->
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<td class="memname">bool Wt::WLayout::removeWidget </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WWidget.html">WWidget</a> * </td>
<td class="paramname"> <em>widget</em> </td>
<td> ) </td>
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<p>
Removes the given <em>widget</em> from the layout.
<p>
This method finds the corresponding <a class="el" href="classWt_1_1WWidgetItem.html" title="A layout item that holds a single widget.">WWidgetItem</a> and calls <a class="el" href="classWt_1_1WLayout.html#8c8d94070a51e669f8077249b67742ae" title="Removes a layout item (widget or nested layout).">removeItem(WLayoutItem *)</a>. The widget itself is not destroyed.<p>
Returns <code>true</code> if succesful.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#886d2ec4b6b97524ba3dff93252e6540" title="Adds the given widget to the layout.">addWidget(WWidget *)</a>, <a class="el" href="classWt_1_1WLayout.html#8c8d94070a51e669f8077249b67742ae" title="Removes a layout item (widget or nested layout).">removeItem(WLayoutItem *)</a> </dd></dl>
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<a class="anchor" name="799b3cce5c1717b18e54c14471e84033"></a><!-- doxytag: member="Wt::WLayout::count" ref="799b3cce5c1717b18e54c14471e84033" args="() const =0" -->
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<td class="memname">virtual int Wt::WLayout::count </td>
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<td> const<code> [pure virtual]</code></td>
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<p>
Returns the number of items in this layout.
<p>
This may be a theoretical number, which is greater than the actual number of items. It can be used to iterate over the items in the layout, in conjunction with <a class="el" href="classWt_1_1WLayout.html#3d48e5e4f56ad5d1b0e60180ebc91442" title="Returns the layout item at a specific index.">itemAt()</a>.
<p>Implemented in <a class="el" href="classWt_1_1WBorderLayout.html#1a29297adea327f48c1235022125f069">Wt::WBorderLayout</a>, <a class="el" href="classWt_1_1WBoxLayout.html#961fe311fd07adbf7b60b571ef7a8278">Wt::WBoxLayout</a>, <a class="el" href="classWt_1_1WDefaultLayout.html#2c662db2763510aa0e47a84c098dcc62">Wt::WDefaultLayout</a>, <a class="el" href="classWt_1_1WFitLayout.html#f8f23224493fcb1958fa676fd079b5e7">Wt::WFitLayout</a>, and <a class="el" href="classWt_1_1WGridLayout.html#95300e5b406b82d9e1993bd96c80cab7">Wt::WGridLayout</a>.</p>
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<a class="anchor" name="3d48e5e4f56ad5d1b0e60180ebc91442"></a><!-- doxytag: member="Wt::WLayout::itemAt" ref="3d48e5e4f56ad5d1b0e60180ebc91442" args="(int index) const =0" -->
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<td class="memname">virtual <a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a>* Wt::WLayout::itemAt </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>index</em> </td>
<td> ) </td>
<td> const<code> [pure virtual]</code></td>
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<p>
Returns the layout item at a specific <em>index</em>.
<p>
If there is no item at the <code>index</code>, <code>0</code> is returned.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#fecba709ae19b93ef9bbe167650dbc5c" title="Returns the index of a given item.">indexOf(WLayoutItem *) const</a>, <a class="el" href="classWt_1_1WLayout.html#799b3cce5c1717b18e54c14471e84033" title="Returns the number of items in this layout.">count()</a> </dd></dl>
<p>Implemented in <a class="el" href="classWt_1_1WBorderLayout.html#cd496ae37d97427d2234fb3147a2f500">Wt::WBorderLayout</a>, <a class="el" href="classWt_1_1WBoxLayout.html#ad2ec4be48cb11a7802b3e6d7cb8f0fd">Wt::WBoxLayout</a>, <a class="el" href="classWt_1_1WDefaultLayout.html#865e47b372c73f913f5a1c7d7124bd1e">Wt::WDefaultLayout</a>, <a class="el" href="classWt_1_1WFitLayout.html#9a058c59e6fc3d7526d1d3c57c940049">Wt::WFitLayout</a>, and <a class="el" href="classWt_1_1WGridLayout.html#dfbab1a8c0090423f24371bb5281fcb7">Wt::WGridLayout</a>.</p>
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<a class="anchor" name="fecba709ae19b93ef9bbe167650dbc5c"></a><!-- doxytag: member="Wt::WLayout::indexOf" ref="fecba709ae19b93ef9bbe167650dbc5c" args="(WLayoutItem *item) const " -->
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<td class="memname">int Wt::WLayout::indexOf </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> * </td>
<td class="paramname"> <em>item</em> </td>
<td> ) </td>
<td> const<code> [virtual]</code></td>
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<p>
Returns the index of a given <em>item</em>.
<p>
The default implementation loops over all items, and returns the index for which itemAt(index) equals <code>item</code>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#3d48e5e4f56ad5d1b0e60180ebc91442" title="Returns the layout item at a specific index.">itemAt(int) const</a> </dd></dl>
<p>Reimplemented in <a class="el" href="classWt_1_1WDefaultLayout.html#b07de0e688076a6d722c2558a5675337">Wt::WDefaultLayout</a>, and <a class="el" href="classWt_1_1WFitLayout.html#68002f0345e96fdfec1ccaa823c52a3e">Wt::WFitLayout</a>.</p>
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<a class="anchor" name="c8fa1927e7c9b15e3e673cbf6a473c34"></a><!-- doxytag: member="Wt::WLayout::setLayoutHint" ref="c8fa1927e7c9b15e3e673cbf6a473c34" args="(const std::string &name, const std::string &value)" -->
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<td class="memname">void Wt::WLayout::setLayoutHint </td>
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<p>
Provides a hint to the layout implementation.
<p>
In some cases, a layout implementation may require some hints for rendering its contents. Possible hints are indicated in the reference documentation for each layout manager.
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<a class="anchor" name="da2f5beaa8a0153451ba55581ea9bbf8"></a><!-- doxytag: member="Wt::WLayout::widget" ref="da2f5beaa8a0153451ba55581ea9bbf8" args="()" -->
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<td class="memname">virtual <a class="el" href="classWt_1_1WWidget.html">WWidget</a>* Wt::WLayout::widget </td>
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<td class="paramname"> </td>
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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>Implements <a class="el" href="classWt_1_1WLayoutItem.html#06b127060eaf8a0b87a994b483d493e1">Wt::WLayoutItem</a>.</p>
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<a class="anchor" name="82078a08c5a21aa67bd5a83c377d437d"></a><!-- doxytag: member="Wt::WLayout::layout" ref="82078a08c5a21aa67bd5a83c377d437d" args="()" -->
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<td class="memname">virtual <a class="el" href="classWt_1_1WLayout.html">WLayout</a>* Wt::WLayout::layout </td>
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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>Implements <a class="el" href="classWt_1_1WLayoutItem.html#3f81b4d198401ae493276a61be6784cf">Wt::WLayoutItem</a>.</p>
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<a class="anchor" name="eb31f2caad3ed9b1ab2b06327cc92bb2"></a><!-- doxytag: member="Wt::WLayout::impl" ref="eb31f2caad3ed9b1ab2b06327cc92bb2" args="() const " -->
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<td class="memname"><a class="el" href="classWt_1_1WLayoutItemImpl.html">WLayoutItemImpl</a>* Wt::WLayout::impl </td>
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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>Implements <a class="el" href="classWt_1_1WLayoutItem.html#b2f17122cf9589657bc0e6fa5e3ea560">Wt::WLayoutItem</a>.</p>
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<a class="anchor" name="f18bae8c743c9f9a5cabee58826ffb45"></a><!-- doxytag: member="Wt::WLayout::setContentsMargins" ref="f18bae8c743c9f9a5cabee58826ffb45" args="(int left, int top, int right, int bottom)" -->
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<p>
Set contents margins (in pixels).
<p>
The default contents margins are 9 pixels in all directions.<p>
<dl class="note" compact><dt><b>Note:</b></dt><dd>Only used when the layout manager is applied to a <a class="el" href="classWt_1_1WContainerWidget.html" title="A widget that holds and manages child widgets.">WContainerWidget</a>.</dd></dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#f18bae8c743c9f9a5cabee58826ffb45" title="Set contents margins (in pixels).">setContentsMargins()</a> </dd></dl>
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<a class="anchor" name="90756cc8765259a26f8d54fd4531c7b3"></a><!-- doxytag: member="Wt::WLayout::getContentsMargins" ref="90756cc8765259a26f8d54fd4531c7b3" args="(int *left, int *top, int *right, int *bottom) const " -->
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<td class="paramname"> <em>top</em>, </td>
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<td class="paramname"> <em>right</em>, </td>
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<td class="paramname"> <em>bottom</em></td><td> </td>
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<p>
Returns the contents margins.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLayout.html#f18bae8c743c9f9a5cabee58826ffb45" title="Set contents margins (in pixels).">setContentsMargins()</a> </dd></dl>
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<a class="anchor" name="a1549c20751b9a50cbc47d3a47adcb21"></a><!-- doxytag: member="Wt::WLayout::update" ref="a1549c20751b9a50cbc47d3a47adcb21" args="(WLayoutItem *item=0)" -->
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<td class="memname">void Wt::WLayout::update </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> * </td>
<td class="paramname"> <em>item</em> = <code>0</code> </td>
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<td><code> [protected]</code></td>
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<p>
Update the layout.
<p>
Must be called whenever some properties of the layout have changed.
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<a class="anchor" name="8cf7d6517ab800c975a25dfc6682c58f"></a><!-- doxytag: member="Wt::WLayout::updateAddItem" ref="8cf7d6517ab800c975a25dfc6682c58f" args="(WLayoutItem *item)" -->
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<td class="memname">void Wt::WLayout::updateAddItem </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> * </td>
<td class="paramname"> <em>item</em> </td>
<td> ) </td>
<td><code> [protected]</code></td>
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<p>
Update the layout, adding the given layout <em>item</em>.
<p>
Must be called from the implementation of <a class="el" href="classWt_1_1WLayout.html#d4a778298c01d290692afc77e441c629" title="Adds a layout item.">addItem(WLayoutItem *)</a>
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<a class="anchor" name="31c7495263f67a4fbc8b384784af628d"></a><!-- doxytag: member="Wt::WLayout::updateRemoveItem" ref="31c7495263f67a4fbc8b384784af628d" args="(WLayoutItem *item)" -->
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<td class="memname">void Wt::WLayout::updateRemoveItem </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WLayoutItem.html">WLayoutItem</a> * </td>
<td class="paramname"> <em>item</em> </td>
<td> ) </td>
<td><code> [protected]</code></td>
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Update the layout, remove the given layout <em>item</em>.
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Must be called from the implementation of <a class="el" href="classWt_1_1WLayout.html#8c8d94070a51e669f8077249b67742ae" title="Removes a layout item (widget or nested layout).">removeItem(WLayoutItem *)</a>
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<a class="anchor" name="f196e38edc970646d765f003a6cc352e"></a><!-- doxytag: member="Wt::WLayout::setLayoutInParent" ref="f196e38edc970646d765f003a6cc352e" args="(WWidget *parent)" -->
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<td class="memname">void Wt::WLayout::setLayoutInParent </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WWidget.html">WWidget</a> * </td>
<td class="paramname"> <em>parent</em> </td>
<td> ) </td>
<td><code> [protected]</code></td>
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Set the layout in the <em>parent</em>.
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Must be called from the constructor after the layout has been fully created (since it will call virtual methods <a class="el" href="classWt_1_1WLayout.html#799b3cce5c1717b18e54c14471e84033" title="Returns the number of items in this layout.">count()</a> and <a class="el" href="classWt_1_1WLayout.html#3d48e5e4f56ad5d1b0e60180ebc91442" title="Returns the layout item at a specific index.">itemAt()</a>).
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