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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <h1 class="title">mainwindow.cpp Example File</h1> <span class="small-subtitle">mainwindows/recentfiles/mainwindow.cpp</span> <!-- $$$mainwindows/recentfiles/mainwindow.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** 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: ** ** "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 Digia Plc and its Subsidiary(-ies) 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 ** "AS IS" 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include <QtGui></span> <span class="preprocessor">#include "mainwindow.h"</span> MainWindow<span class="operator">::</span>MainWindow() { setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose); textEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtextedit.html">QTextEdit</a></span>; setCentralWidget(textEdit); createActions(); createMenus(); (<span class="type">void</span>)statusBar(); setWindowFilePath(<span class="type"><a href="qstring.html">QString</a></span>()); resize(<span class="number">400</span><span class="operator">,</span> <span class="number">300</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>newFile() { MainWindow <span class="operator">*</span>other <span class="operator">=</span> <span class="keyword">new</span> MainWindow; other<span class="operator">-</span><span class="operator">></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()) loadFile(fileName); } <span class="type">void</span> MainWindow<span class="operator">::</span>save() { <span class="keyword">if</span> (curFile<span class="operator">.</span>isEmpty()) saveAs(); <span class="keyword">else</span> saveFile(curFile); } <span class="type">void</span> MainWindow<span class="operator">::</span>saveAs() { <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>getSaveFileName(<span class="keyword">this</span>); <span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty()) <span class="keyword">return</span>; saveFile(fileName); } <span class="type">void</span> MainWindow<span class="operator">::</span>openRecentFile() { <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span><span class="operator">></span>(sender()); <span class="keyword">if</span> (action) loadFile(action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>toString()); } <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">"About Recent Files"</span>)<span class="operator">,</span> tr(<span class="string">"The <b>Recent Files</b> example demonstrates how to provide a "</span> <span class="string">"recently used file menu in a Qt application."</span>)); } <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>(tr(<span class="string">"&New"</span>)<span class="operator">,</span> <span class="keyword">this</span>); newAct<span class="operator">-</span><span class="operator">></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">></span>setStatusTip(tr(<span class="string">"Create a new file"</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>(tr(<span class="string">"&Open..."</span>)<span class="operator">,</span> <span class="keyword">this</span>); openAct<span class="operator">-</span><span class="operator">></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">></span>setStatusTip(tr(<span class="string">"Open an existing file"</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>(tr(<span class="string">"&Save"</span>)<span class="operator">,</span> <span class="keyword">this</span>); saveAct<span class="operator">-</span><span class="operator">></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">></span>setStatusTip(tr(<span class="string">"Save the document to disk"</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">"Save &As..."</span>)<span class="operator">,</span> <span class="keyword">this</span>); saveAsAct<span class="operator">-</span><span class="operator">></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">></span>setStatusTip(tr(<span class="string">"Save the document under a new name"</span>)); connect(saveAsAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(saveAs())); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> MaxRecentFiles; <span class="operator">+</span><span class="operator">+</span>i) { recentFileActs<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="keyword">this</span>); recentFileActs<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">false</span>); connect(recentFileActs<span class="operator">[</span>i<span class="operator">]</span><span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(openRecentFile())); } exitAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"E&xit"</span>)<span class="operator">,</span> <span class="keyword">this</span>); exitAct<span class="operator">-</span><span class="operator">></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">></span>setStatusTip(tr(<span class="string">"Exit the application"</span>)); connect(exitAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(closeAllWindows())); aboutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&About"</span>)<span class="operator">,</span> <span class="keyword">this</span>); aboutAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Show the application's About box"</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">"About &Qt"</span>)<span class="operator">,</span> <span class="keyword">this</span>); aboutQtAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Show the Qt library's About box"</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">></span>addMenu(tr(<span class="string">"&File"</span>)); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(newAct); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(openAct); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(saveAct); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(saveAsAct); separatorAct <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator(); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> MaxRecentFiles; <span class="operator">+</span><span class="operator">+</span>i) fileMenu<span class="operator">-</span><span class="operator">></span>addAction(recentFileActs<span class="operator">[</span>i<span class="operator">]</span>); fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator(); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(exitAct); updateRecentFileActions(); menuBar()<span class="operator">-</span><span class="operator">></span>addSeparator(); helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Help"</span>)); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutAct); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutQtAct); } <span class="type">void</span> MainWindow<span class="operator">::</span>loadFile(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>fileName) { <span class="type"><a href="qfile.html">QFile</a></span> file(fileName); <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>Text)) { <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Recent Files"</span>)<span class="operator">,</span> tr(<span class="string">"Cannot read file %1:\n%2."</span>) <span class="operator">.</span>arg(fileName) <span class="operator">.</span>arg(file<span class="operator">.</span>errorString())); <span class="keyword">return</span>; } <span class="type"><a href="qtextstream.html">QTextStream</a></span> in(<span class="operator">&</span>file); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>setOverrideCursor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WaitCursor); textEdit<span class="operator">-</span><span class="operator">></span>setPlainText(in<span class="operator">.</span>readAll()); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>restoreOverrideCursor(); setCurrentFile(fileName); statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"File loaded"</span>)<span class="operator">,</span> <span class="number">2000</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>saveFile(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>fileName) { <span class="type"><a href="qfile.html">QFile</a></span> file(fileName); <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>Text)) { <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Recent Files"</span>)<span class="operator">,</span> tr(<span class="string">"Cannot write file %1:\n%2."</span>) <span class="operator">.</span>arg(fileName) <span class="operator">.</span>arg(file<span class="operator">.</span>errorString())); <span class="keyword">return</span>; } <span class="type"><a href="qtextstream.html">QTextStream</a></span> out(<span class="operator">&</span>file); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>setOverrideCursor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WaitCursor); out <span class="operator"><</span><span class="operator"><</span> textEdit<span class="operator">-</span><span class="operator">></span>toPlainText(); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>restoreOverrideCursor(); setCurrentFile(fileName); statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"File saved"</span>)<span class="operator">,</span> <span class="number">2000</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>setCurrentFile(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>fileName) { curFile <span class="operator">=</span> fileName; setWindowFilePath(curFile); <span class="type"><a href="qsettings.html">QSettings</a></span> settings; <span class="type"><a href="qstringlist.html">QStringList</a></span> files <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">"recentFileList"</span>)<span class="operator">.</span>toStringList(); files<span class="operator">.</span>removeAll(fileName); files<span class="operator">.</span>prepend(fileName); <span class="keyword">while</span> (files<span class="operator">.</span>size() <span class="operator">></span> MaxRecentFiles) files<span class="operator">.</span>removeLast(); settings<span class="operator">.</span>setValue(<span class="string">"recentFileList"</span><span class="operator">,</span> files); foreach (<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget<span class="operator">,</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>topLevelWidgets()) { MainWindow <span class="operator">*</span>mainWin <span class="operator">=</span> qobject_cast<span class="operator"><</span>MainWindow <span class="operator">*</span><span class="operator">></span>(widget); <span class="keyword">if</span> (mainWin) mainWin<span class="operator">-</span><span class="operator">></span>updateRecentFileActions(); } } <span class="type">void</span> MainWindow<span class="operator">::</span>updateRecentFileActions() { <span class="type"><a href="qsettings.html">QSettings</a></span> settings; <span class="type"><a href="qstringlist.html">QStringList</a></span> files <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">"recentFileList"</span>)<span class="operator">.</span>toStringList(); <span class="type">int</span> numRecentFiles <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(files<span class="operator">.</span>size()<span class="operator">,</span> (<span class="type">int</span>)MaxRecentFiles); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> numRecentFiles; <span class="operator">+</span><span class="operator">+</span>i) { <span class="type"><a href="qstring.html">QString</a></span> text <span class="operator">=</span> tr(<span class="string">"&%1 %2"</span>)<span class="operator">.</span>arg(i <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>arg(strippedName(files<span class="operator">[</span>i<span class="operator">]</span>)); recentFileActs<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setText(text); recentFileActs<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setData(files<span class="operator">[</span>i<span class="operator">]</span>); recentFileActs<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">true</span>); } <span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> numRecentFiles; j <span class="operator"><</span> MaxRecentFiles; <span class="operator">+</span><span class="operator">+</span>j) recentFileActs<span class="operator">[</span>j<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">false</span>); separatorAct<span class="operator">-</span><span class="operator">></span>setVisible(numRecentFiles <span class="operator">></span> <span class="number">0</span>); } <span class="type"><a href="qstring.html">QString</a></span> MainWindow<span class="operator">::</span>strippedName(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>fullFileName) { <span class="keyword">return</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span>(fullFileName)<span class="operator">.</span>fileName(); }</pre> </div> <!-- @@@mainwindows/recentfiles/mainwindow.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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