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<td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td >Border Layout Example</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#running-the-example">Running the Example</a></li>
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<h1 class="title">Border Layout Example</h1>
<span class="subtitle"></span>
<!-- $$$layouts/borderlayout-brief -->
<p>Shows how to arrange child widgets along a border.</p>
<!-- @@@layouts/borderlayout -->
<!-- $$$layouts/borderlayout-description -->
<div class="descr"> <a name="details"></a>
<p><i>Border Layout</i> implements a layout that arranges child widgets to surround the main area.</p>
<p class="centerAlign"><img src="images/borderlayout-example.png" alt="" /></p><p>The constructor of the Window class creates a <a href="qtextbrowser.html">QTextBrowser</a> object, to which a BorderLayout named <code>layout</code> is added. The declaration of the BorderLayout class is quoted at the end of this document.</p>
<pre class="cpp">
Window<span class="operator">::</span>Window()
{
<span class="type"><a href="qtextbrowser.html">QTextBrowser</a></span> <span class="operator">*</span>centralWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtextbrowser.html">QTextBrowser</a></span>;
centralWidget<span class="operator">-</span><span class="operator">></span>setPlainText(tr(<span class="string">"Central widget"</span>));
BorderLayout <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> BorderLayout;
</pre>
<p>Several labeled widgets are added to <code>layout</code> with the orientation <code>Center</code>, <code>North</code>, <code>West</code>, <code>East 1</code>, <code>East 2</code>, and <code>South</code>.</p>
<pre class="cpp">
layout<span class="operator">-</span><span class="operator">></span>addWidget(centralWidget<span class="operator">,</span> BorderLayout<span class="operator">::</span>Center);
layout<span class="operator">-</span><span class="operator">></span>addWidget(createLabel(<span class="string">"North"</span>)<span class="operator">,</span> BorderLayout<span class="operator">::</span>North);
layout<span class="operator">-</span><span class="operator">></span>addWidget(createLabel(<span class="string">"West"</span>)<span class="operator">,</span> BorderLayout<span class="operator">::</span>West);
layout<span class="operator">-</span><span class="operator">></span>addWidget(createLabel(<span class="string">"East 1"</span>)<span class="operator">,</span> BorderLayout<span class="operator">::</span>East);
layout<span class="operator">-</span><span class="operator">></span>addWidget(createLabel(<span class="string">"East 2"</span>) <span class="operator">,</span> BorderLayout<span class="operator">::</span>East);
layout<span class="operator">-</span><span class="operator">></span>addWidget(createLabel(<span class="string">"South"</span>)<span class="operator">,</span> BorderLayout<span class="operator">::</span>South);
setLayout(layout);
setWindowTitle(tr(<span class="string">"Border Layout"</span>));
</pre>
<p>createLabel() in class <code>Window</code> sets the text of the labeled widgets and the style.</p>
<pre class="cpp">
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>Window<span class="operator">::</span>createLabel(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>text)
{
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>label <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(text);
label<span class="operator">-</span><span class="operator">></span>setFrameStyle(<span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>Box <span class="operator">|</span> <span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>Raised);
<span class="keyword">return</span> label;
}
</pre>
<p>Class BorderLayout contains all the utilitarian functions for formatting the widgets it contains.</p>
<pre class="cpp">
<span class="keyword">class</span> BorderLayout : <span class="keyword">public</span> <span class="type"><a href="qlayout.html">QLayout</a></span>
{
<span class="keyword">public</span>:
<span class="keyword">enum</span> Position { West<span class="operator">,</span> North<span class="operator">,</span> South<span class="operator">,</span> East<span class="operator">,</span> Center };
<span class="keyword">explicit</span> BorderLayout(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="type">int</span> margin <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="type">int</span> spacing <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>);
BorderLayout(<span class="type">int</span> spacing <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>);
<span class="operator">~</span>BorderLayout();
<span class="type">void</span> addItem(<span class="type"><a href="qlayoutitem.html">QLayoutItem</a></span> <span class="operator">*</span>item) override;
<span class="type">void</span> addWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget<span class="operator">,</span> Position position);
<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Orientations expandingDirections() <span class="keyword">const</span> override;
bool hasHeightForWidth() <span class="keyword">const</span> override;
<span class="type">int</span> count() <span class="keyword">const</span> override;
<span class="type"><a href="qlayoutitem.html">QLayoutItem</a></span> <span class="operator">*</span>itemAt(<span class="type">int</span> index) <span class="keyword">const</span> override;
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> minimumSize() <span class="keyword">const</span> override;
<span class="type">void</span> setGeometry(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> <span class="operator">&</span>rect) override;
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span> override;
<span class="type"><a href="qlayoutitem.html">QLayoutItem</a></span> <span class="operator">*</span>takeAt(<span class="type">int</span> index) override;
<span class="type">void</span> add(<span class="type"><a href="qlayoutitem.html">QLayoutItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> Position position);
<span class="keyword">private</span>:
<span class="keyword">struct</span> ItemWrapper
{
ItemWrapper(<span class="type"><a href="qlayoutitem.html">QLayoutItem</a></span> <span class="operator">*</span>i<span class="operator">,</span> Position p) {
item <span class="operator">=</span> i;
position <span class="operator">=</span> p;
}
<span class="type"><a href="qlayoutitem.html">QLayoutItem</a></span> <span class="operator">*</span>item;
Position position;
};
<span class="keyword">enum</span> SizeType { MinimumSize<span class="operator">,</span> SizeHint };
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> calculateSize(SizeType sizeType) <span class="keyword">const</span>;
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span>ItemWrapper <span class="operator">*</span><span class="operator">></span> list;
};
</pre>
<p>For more information, visit the <a href="layout.html">Layout Management</a> page.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<p>Files:</p>
<ul>
<li><a href="qtwidgets-layouts-borderlayout-borderlayout-cpp.html">layouts/borderlayout/borderlayout.cpp</a></li>
<li><a href="qtwidgets-layouts-borderlayout-borderlayout-h.html">layouts/borderlayout/borderlayout.h</a></li>
<li><a href="qtwidgets-layouts-borderlayout-borderlayout-pro.html">layouts/borderlayout/borderlayout.pro</a></li>
<li><a href="qtwidgets-layouts-borderlayout-main-cpp.html">layouts/borderlayout/main.cpp</a></li>
<li><a href="qtwidgets-layouts-borderlayout-window-cpp.html">layouts/borderlayout/window.cpp</a></li>
<li><a href="qtwidgets-layouts-borderlayout-window-h.html">layouts/borderlayout/window.h</a></li>
</ul>
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