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<td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td >Simple Anchor Layout Example</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">Simple Anchor Layout Example</h1>
<span class="subtitle"></span>
<!-- $$$graphicsview/simpleanchorlayout-brief -->
<p>Demonstrates anchor layout on a graphics view scene.</p>
<!-- @@@graphicsview/simpleanchorlayout -->
<!-- $$$graphicsview/simpleanchorlayout-description -->
<div class="descr"> <a name="details"></a>
<p>The Simple Anchor Layout example shows the basic use of the <a href="qgraphicsanchorlayout.html">QGraphicsAnchorLayout</a> class.</p>
<p class="centerAlign"><img src="images/graphicssimpleanchorlayout-example.png" alt="" /></p><p>The example starts by creating a <a href="qgraphicsscene.html">QGraphicsScene</a> (<code>scene</code>), 3 widgets (<code>a</code>, <code>b</code>, and <code>c</code>), and a QGraphicsAnchorlayout (<code>layout</code>).</p>
<pre class="cpp">
<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span> <span class="operator">*</span>scene <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span>();
Widget <span class="operator">*</span>a <span class="operator">=</span> <span class="keyword">new</span> Widget(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>blue<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white<span class="operator">,</span> <span class="string">"a"</span>);
a<span class="operator">-</span><span class="operator">></span>setPreferredSize(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>);
Widget <span class="operator">*</span>b <span class="operator">=</span> <span class="keyword">new</span> Widget(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>green<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black<span class="operator">,</span> <span class="string">"b"</span>);
b<span class="operator">-</span><span class="operator">></span>setPreferredSize(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>);
Widget <span class="operator">*</span>c <span class="operator">=</span> <span class="keyword">new</span> Widget(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black<span class="operator">,</span> <span class="string">"c"</span>);
c<span class="operator">-</span><span class="operator">></span>setPreferredSize(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>);
<span class="type"><a href="qgraphicsanchorlayout.html">QGraphicsAnchorLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsanchorlayout.html">QGraphicsAnchorLayout</a></span>();
</pre>
<p>First it anchors the top left corner of item <code>a</code> to the top left corner of <code>layout</code>. This can be done in two steps:</p>
<pre class="cpp">
layout->addAnchor(a, Qt::AnchorTop, layout, Qt::AnchorTop);
layout->addAnchor(a, Qt::AnchorLeft, layout, Qt::AnchorLeft);
</pre>
<p>Or in one step:</p>
<pre class="cpp">
layout<span class="operator">-</span><span class="operator">></span>addCornerAnchors(a<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>TopLeftCorner<span class="operator">,</span> layout<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>TopLeftCorner);
</pre>
<p>Then the right anchor of <code>a</code> is anchored to the left anchor of <code>b</code>, and the top of item <code>b</code> is anchored to the bottom of <code>a</code>.</p>
<pre class="cpp">
layout<span class="operator">-</span><span class="operator">></span>addAnchor(b<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AnchorLeft<span class="operator">,</span> a<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AnchorRight);
layout<span class="operator">-</span><span class="operator">></span>addAnchor(b<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AnchorTop<span class="operator">,</span> a<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AnchorBottom);
</pre>
<p>Place a third widget <code>c</code> under widget <code>b</code>:</p>
<pre class="cpp">
layout<span class="operator">-</span><span class="operator">></span>addAnchor(b<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AnchorBottom<span class="operator">,</span> c<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AnchorTop);
</pre>
<p>Items <code>b</code> and <code>c</code> are anchored to each other horizontally:</p>
<pre class="cpp">
layout<span class="operator">-</span><span class="operator">></span>addAnchors(b<span class="operator">,</span> c<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
</pre>
<p>Item c is anchored to the bottom right point of <code>layout</code></p>
<pre class="cpp">
layout<span class="operator">-</span><span class="operator">></span>addCornerAnchors(c<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>BottomRightCorner<span class="operator">,</span> layout<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>BottomRightCorner);
</pre>
<p>Finally, <a href="graphicsview.html#qgraphicswidget">QGraphicsWidget</a> <code>w</code> is displayed in <a href="qgraphicsview.html">QGraphicsView</a> <code>view</code>.</p>
<pre class="cpp">
<span class="type"><a href="qgraphicswidget.html">QGraphicsWidget</a></span> <span class="operator">*</span>w <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicswidget.html">QGraphicsWidget</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Window <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CustomizeWindowHint <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WindowTitleHint);
w<span class="operator">-</span><span class="operator">></span>setPos(<span class="number">20</span><span class="operator">,</span> <span class="number">20</span>);
w<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>);
w<span class="operator">-</span><span class="operator">></span>setPreferredSize(<span class="number">320</span><span class="operator">,</span> <span class="number">240</span>);
w<span class="operator">-</span><span class="operator">></span>setLayout(layout);
w<span class="operator">-</span><span class="operator">></span>setWindowTitle(<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>translate(<span class="string">"simpleanchorlayout"</span><span class="operator">,</span> <span class="string">"QGraphicsAnchorLayout in use"</span>));
scene<span class="operator">-</span><span class="operator">></span>addItem(w);
<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span> <span class="operator">*</span>view <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span>();
view<span class="operator">-</span><span class="operator">></span>setScene(scene);
view<span class="operator">-</span><span class="operator">></span>setWindowTitle(<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>translate(<span class="string">"simpleanchorlayout"</span><span class="operator">,</span> <span class="string">"Simple Anchor Layout"</span>));
view<span class="operator">-</span><span class="operator">></span>resize(<span class="number">360</span><span class="operator">,</span> <span class="number">320</span>);
view<span class="operator">-</span><span class="operator">></span>show();
<span class="keyword">return</span> app<span class="operator">.</span>exec();
</pre>
<p>Files:</p>
<ul>
<li><a href="qtwidgets-graphicsview-simpleanchorlayout-main-cpp.html">graphicsview/simpleanchorlayout/main.cpp</a></li>
<li><a href="qtwidgets-graphicsview-simpleanchorlayout-simpleanchorlayout-pro.html">graphicsview/simpleanchorlayout/simpleanchorlayout.pro</a></li>
</ul>
</div>
<p><b>See also </b><a href="qtwidgets-graphicsview-anchorlayout-example.html">Anchor Layout Example</a>.</p>
<!-- @@@graphicsview/simpleanchorlayout -->
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