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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">mainwindows/mdi/mainwindow.cpp</span>
<!-- $$$mainwindows/mdi/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
 **
 ** Copyright (C) 2015 The Qt Company Ltd.
 ** Contact: http://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** &quot;Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/</span>

 <span class="preprocessor">#include &lt;QtGui&gt;</span>

 <span class="preprocessor">#include &quot;mainwindow.h&quot;</span>
 <span class="preprocessor">#include &quot;mdichild.h&quot;</span>

 MainWindow<span class="operator">::</span>MainWindow()
 {
     mdiArea <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmdiarea.html">QMdiArea</a></span>;
     mdiArea<span class="operator">-</span><span class="operator">&gt;</span>setHorizontalScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAsNeeded);
     mdiArea<span class="operator">-</span><span class="operator">&gt;</span>setVerticalScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAsNeeded);
     setCentralWidget(mdiArea);
     connect(mdiArea<span class="operator">,</span> SIGNAL(subWindowActivated(<span class="type"><a href="qmdisubwindow.html">QMdiSubWindow</a></span><span class="operator">*</span>))<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(updateMenus()));
     windowMapper <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsignalmapper.html">QSignalMapper</a></span>(<span class="keyword">this</span>);
     connect(windowMapper<span class="operator">,</span> SIGNAL(mapped(<span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span>))<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(setActiveSubWindow(<span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span>)));

     createActions();
     createMenus();
     createToolBars();
     createStatusBar();
     updateMenus();

     readSettings();

     setWindowTitle(tr(<span class="string">&quot;MDI&quot;</span>));
     setUnifiedTitleAndToolBarOnMac(<span class="keyword">true</span>);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>closeEvent(<span class="type"><a href="qcloseevent.html">QCloseEvent</a></span> <span class="operator">*</span>event)
 {
     mdiArea<span class="operator">-</span><span class="operator">&gt;</span>closeAllSubWindows();
     <span class="keyword">if</span> (mdiArea<span class="operator">-</span><span class="operator">&gt;</span>currentSubWindow()) {
         event<span class="operator">-</span><span class="operator">&gt;</span>ignore();
     } <span class="keyword">else</span> {
         writeSettings();
         event<span class="operator">-</span><span class="operator">&gt;</span>accept();
     }
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>newFile()
 {
     MdiChild <span class="operator">*</span>child <span class="operator">=</span> createMdiChild();
     child<span class="operator">-</span><span class="operator">&gt;</span>newFile();
     child<span class="operator">-</span><span class="operator">&gt;</span>show();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>open()
 {
     <span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span>);
     <span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty()) {
         <span class="type"><a href="qmdisubwindow.html">QMdiSubWindow</a></span> <span class="operator">*</span>existing <span class="operator">=</span> findMdiChild(fileName);
         <span class="keyword">if</span> (existing) {
             mdiArea<span class="operator">-</span><span class="operator">&gt;</span>setActiveSubWindow(existing);
             <span class="keyword">return</span>;
         }

         MdiChild <span class="operator">*</span>child <span class="operator">=</span> createMdiChild();
         <span class="keyword">if</span> (child<span class="operator">-</span><span class="operator">&gt;</span>loadFile(fileName)) {
             statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;File loaded&quot;</span>)<span class="operator">,</span> <span class="number">2000</span>);
             child<span class="operator">-</span><span class="operator">&gt;</span>show();
         } <span class="keyword">else</span> {
             child<span class="operator">-</span><span class="operator">&gt;</span>close();
         }
     }
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>save()
 {
     <span class="keyword">if</span> (activeMdiChild() <span class="operator">&amp;</span><span class="operator">&amp;</span> activeMdiChild()<span class="operator">-</span><span class="operator">&gt;</span>save())
         statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;File saved&quot;</span>)<span class="operator">,</span> <span class="number">2000</span>);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>saveAs()
 {
     <span class="keyword">if</span> (activeMdiChild() <span class="operator">&amp;</span><span class="operator">&amp;</span> activeMdiChild()<span class="operator">-</span><span class="operator">&gt;</span>saveAs())
         statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;File saved&quot;</span>)<span class="operator">,</span> <span class="number">2000</span>);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>cut()
 {
     <span class="keyword">if</span> (activeMdiChild())
         activeMdiChild()<span class="operator">-</span><span class="operator">&gt;</span>cut();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>copy()
 {
     <span class="keyword">if</span> (activeMdiChild())
         activeMdiChild()<span class="operator">-</span><span class="operator">&gt;</span>copy();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>paste()
 {
     <span class="keyword">if</span> (activeMdiChild())
         activeMdiChild()<span class="operator">-</span><span class="operator">&gt;</span>paste();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>about()
 {
    <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;About MDI&quot;</span>)<span class="operator">,</span>
             tr(<span class="string">&quot;The &lt;b&gt;MDI&lt;/b&gt; example demonstrates how to write multiple &quot;</span>
                <span class="string">&quot;document interface applications using Qt.&quot;</span>));
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>updateMenus()
 {
     <span class="type">bool</span> hasMdiChild <span class="operator">=</span> (activeMdiChild() <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
     saveAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     saveAsAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     pasteAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     closeAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     closeAllAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     tileAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     cascadeAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     nextAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     previousAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasMdiChild);
     separatorAct<span class="operator">-</span><span class="operator">&gt;</span>setVisible(hasMdiChild);

     <span class="type">bool</span> hasSelection <span class="operator">=</span> (activeMdiChild() <span class="operator">&amp;</span><span class="operator">&amp;</span>
                          activeMdiChild()<span class="operator">-</span><span class="operator">&gt;</span>textCursor()<span class="operator">.</span>hasSelection());
     cutAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasSelection);
     copyAct<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(hasSelection);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>updateWindowMenu()
 {
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>clear();
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(closeAct);
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(closeAllAct);
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tileAct);
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(cascadeAct);
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(nextAct);
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(previousAct);
     windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(separatorAct);

     <span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qmdisubwindow.html">QMdiSubWindow</a></span> <span class="operator">*</span><span class="operator">&gt;</span> windows <span class="operator">=</span> mdiArea<span class="operator">-</span><span class="operator">&gt;</span>subWindowList();
     separatorAct<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="operator">!</span>windows<span class="operator">.</span>isEmpty());

     <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> windows<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
         MdiChild <span class="operator">*</span>child <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>MdiChild <span class="operator">*</span><span class="operator">&gt;</span>(windows<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">&gt;</span>widget());

         <span class="type"><a href="qstring.html">QString</a></span> text;
         <span class="keyword">if</span> (i <span class="operator">&lt;</span> <span class="number">9</span>) {
             text <span class="operator">=</span> tr(<span class="string">&quot;&amp;%1 %2&quot;</span>)<span class="operator">.</span>arg(i <span class="operator">+</span> <span class="number">1</span>)
                                <span class="operator">.</span>arg(child<span class="operator">-</span><span class="operator">&gt;</span>userFriendlyCurrentFile());
         } <span class="keyword">else</span> {
             text <span class="operator">=</span> tr(<span class="string">&quot;%1 %2&quot;</span>)<span class="operator">.</span>arg(i <span class="operator">+</span> <span class="number">1</span>)
                               <span class="operator">.</span>arg(child<span class="operator">-</span><span class="operator">&gt;</span>userFriendlyCurrentFile());
         }
         <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action  <span class="operator">=</span> windowMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(text);
         action<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
         action <span class="operator">-</span><span class="operator">&gt;</span>setChecked(child <span class="operator">=</span><span class="operator">=</span> activeMdiChild());
         connect(action<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> windowMapper<span class="operator">,</span> SLOT(map()));
         windowMapper<span class="operator">-</span><span class="operator">&gt;</span>setMapping(action<span class="operator">,</span> windows<span class="operator">.</span>at(i));
     }
 }

 MdiChild <span class="operator">*</span>MainWindow<span class="operator">::</span>createMdiChild()
 {
     MdiChild <span class="operator">*</span>child <span class="operator">=</span> <span class="keyword">new</span> MdiChild;
     mdiArea<span class="operator">-</span><span class="operator">&gt;</span>addSubWindow(child);

     connect(child<span class="operator">,</span> SIGNAL(copyAvailable(<span class="type">bool</span>))<span class="operator">,</span>
             cutAct<span class="operator">,</span> SLOT(setEnabled(<span class="type">bool</span>)));
     connect(child<span class="operator">,</span> SIGNAL(copyAvailable(<span class="type">bool</span>))<span class="operator">,</span>
             copyAct<span class="operator">,</span> SLOT(setEnabled(<span class="type">bool</span>)));

     <span class="keyword">return</span> child;
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>createActions()
 {
     newAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/images/new.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;&amp;New&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     newAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>New);
     newAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Create a new file&quot;</span>));
     connect(newAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(newFile()));

     openAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/images/open.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;&amp;Open...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     openAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
     openAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Open an existing file&quot;</span>));
     connect(openAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(open()));

     saveAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/images/save.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;&amp;Save&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     saveAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Save);
     saveAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Save the document to disk&quot;</span>));
     connect(saveAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(save()));

     saveAsAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Save &amp;As...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     saveAsAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>SaveAs);
     saveAsAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Save the document under a new name&quot;</span>));
     connect(saveAsAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(saveAs()));

     exitAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;E&amp;xit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     exitAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
     exitAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Exit the application&quot;</span>));
     connect(exitAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(closeAllWindows()));

     cutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/images/cut.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;Cu&amp;t&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     cutAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Cut);
     cutAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Cut the current selection's contents to the &quot;</span>
                             <span class="string">&quot;clipboard&quot;</span>));
     connect(cutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(cut()));

     copyAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/images/copy.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;&amp;Copy&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     copyAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Copy);
     copyAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Copy the current selection's contents to the &quot;</span>
                              <span class="string">&quot;clipboard&quot;</span>));
     connect(copyAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(copy()));

     pasteAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/images/paste.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;&amp;Paste&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     pasteAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Paste);
     pasteAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Paste the clipboard's contents into the current &quot;</span>
                               <span class="string">&quot;selection&quot;</span>));
     connect(pasteAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(paste()));

     closeAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Cl&amp;ose&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     closeAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Close the active window&quot;</span>));
     connect(closeAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
             mdiArea<span class="operator">,</span> SLOT(closeActiveSubWindow()));

     closeAllAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Close &amp;All&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     closeAllAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Close all the windows&quot;</span>));
     connect(closeAllAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
             mdiArea<span class="operator">,</span> SLOT(closeAllSubWindows()));

     tileAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Tile&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     tileAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Tile the windows&quot;</span>));
     connect(tileAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> mdiArea<span class="operator">,</span> SLOT(tileSubWindows()));

     cascadeAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Cascade&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     cascadeAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Cascade the windows&quot;</span>));
     connect(cascadeAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> mdiArea<span class="operator">,</span> SLOT(cascadeSubWindows()));

     nextAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Ne&amp;xt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     nextAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>NextChild);
     nextAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Move the focus to the next window&quot;</span>));
     connect(nextAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
             mdiArea<span class="operator">,</span> SLOT(activateNextSubWindow()));

     previousAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Pre&amp;vious&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     previousAct<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>PreviousChild);
     previousAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Move the focus to the previous &quot;</span>
                                  <span class="string">&quot;window&quot;</span>));
     connect(previousAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
             mdiArea<span class="operator">,</span> SLOT(activatePreviousSubWindow()));

     separatorAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="keyword">this</span>);
     separatorAct<span class="operator">-</span><span class="operator">&gt;</span>setSeparator(<span class="keyword">true</span>);

     aboutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;About&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     aboutAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Show the application's About box&quot;</span>));
     connect(aboutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));

     aboutQtAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;About &amp;Qt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     aboutQtAct<span class="operator">-</span><span class="operator">&gt;</span>setStatusTip(tr(<span class="string">&quot;Show the Qt library's About box&quot;</span>));
     connect(aboutQtAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>createMenus()
 {
     fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;File&quot;</span>));
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(newAct);
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(openAct);
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(saveAct);
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(saveAsAct);
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
     <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;Switch layout direction&quot;</span>));
     connect(action<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(switchLayoutDirection()));
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(exitAct);

     editMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Edit&quot;</span>));
     editMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(cutAct);
     editMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(copyAct);
     editMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(pasteAct);

     windowMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Window&quot;</span>));
     updateWindowMenu();
     connect(windowMenu<span class="operator">,</span> SIGNAL(aboutToShow())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateWindowMenu()));

     menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();

     helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Help&quot;</span>));
     helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutAct);
     helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutQtAct);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>createToolBars()
 {
     fileToolBar <span class="operator">=</span> addToolBar(tr(<span class="string">&quot;File&quot;</span>));
     fileToolBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(newAct);
     fileToolBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(openAct);
     fileToolBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(saveAct);

     editToolBar <span class="operator">=</span> addToolBar(tr(<span class="string">&quot;Edit&quot;</span>));
     editToolBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(cutAct);
     editToolBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(copyAct);
     editToolBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(pasteAct);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>createStatusBar()
 {
     statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;Ready&quot;</span>));
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>readSettings()
 {
     <span class="type"><a href="qsettings.html">QSettings</a></span> settings(<span class="string">&quot;Trolltech&quot;</span><span class="operator">,</span> <span class="string">&quot;MDI Example&quot;</span>);
     <span class="type"><a href="qpoint.html">QPoint</a></span> pos <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;pos&quot;</span><span class="operator">,</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">200</span><span class="operator">,</span> <span class="number">200</span>))<span class="operator">.</span>toPoint();
     <span class="type"><a href="qsize.html">QSize</a></span> size <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;size&quot;</span><span class="operator">,</span> <span class="type"><a href="qsize.html">QSize</a></span>(<span class="number">400</span><span class="operator">,</span> <span class="number">400</span>))<span class="operator">.</span>toSize();
     move(pos);
     resize(size);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>writeSettings()
 {
     <span class="type"><a href="qsettings.html">QSettings</a></span> settings(<span class="string">&quot;Trolltech&quot;</span><span class="operator">,</span> <span class="string">&quot;MDI Example&quot;</span>);
     settings<span class="operator">.</span>setValue(<span class="string">&quot;pos&quot;</span><span class="operator">,</span> pos());
     settings<span class="operator">.</span>setValue(<span class="string">&quot;size&quot;</span><span class="operator">,</span> size());
 }

 MdiChild <span class="operator">*</span>MainWindow<span class="operator">::</span>activeMdiChild()
 {
     <span class="keyword">if</span> (<span class="type"><a href="qmdisubwindow.html">QMdiSubWindow</a></span> <span class="operator">*</span>activeSubWindow <span class="operator">=</span> mdiArea<span class="operator">-</span><span class="operator">&gt;</span>activeSubWindow())
         <span class="keyword">return</span> qobject_cast<span class="operator">&lt;</span>MdiChild <span class="operator">*</span><span class="operator">&gt;</span>(activeSubWindow<span class="operator">-</span><span class="operator">&gt;</span>widget());
     <span class="keyword">return</span> <span class="number">0</span>;
 }

 <span class="type"><a href="qmdisubwindow.html">QMdiSubWindow</a></span> <span class="operator">*</span>MainWindow<span class="operator">::</span>findMdiChild(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName)
 {
     <span class="type"><a href="qstring.html">QString</a></span> canonicalFilePath <span class="operator">=</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span>(fileName)<span class="operator">.</span>canonicalFilePath();

     foreach (<span class="type"><a href="qmdisubwindow.html">QMdiSubWindow</a></span> <span class="operator">*</span>window<span class="operator">,</span> mdiArea<span class="operator">-</span><span class="operator">&gt;</span>subWindowList()) {
         MdiChild <span class="operator">*</span>mdiChild <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>MdiChild <span class="operator">*</span><span class="operator">&gt;</span>(window<span class="operator">-</span><span class="operator">&gt;</span>widget());
         <span class="keyword">if</span> (mdiChild<span class="operator">-</span><span class="operator">&gt;</span>currentFile() <span class="operator">=</span><span class="operator">=</span> canonicalFilePath)
             <span class="keyword">return</span> window;
     }
     <span class="keyword">return</span> <span class="number">0</span>;
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>switchLayoutDirection()
 {
     <span class="keyword">if</span> (layoutDirection() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftToRight)
         qApp<span class="operator">-</span><span class="operator">&gt;</span>setLayoutDirection(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>RightToLeft);
     <span class="keyword">else</span>
         qApp<span class="operator">-</span><span class="operator">&gt;</span>setLayoutDirection(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftToRight);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>setActiveSubWindow(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>window)
 {
     <span class="keyword">if</span> (<span class="operator">!</span>window)
         <span class="keyword">return</span>;
     mdiArea<span class="operator">-</span><span class="operator">&gt;</span>setActiveSubWindow(qobject_cast<span class="operator">&lt;</span><span class="type"><a href="qmdisubwindow.html">QMdiSubWindow</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(window));
 }</pre>
</div>
<!-- @@@mainwindows/mdi/mainwindow.cpp -->
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