<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- borderlayout.qdoc --> <title>Border Layout Example | Qt Widgets 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <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> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#running-the-example">Running the Example</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <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> </div> <!-- @@@layouts/borderlayout --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>