454 lines
31 KiB
HTML
454 lines
31 KiB
HTML
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<h1 class="title">mainwindow.cpp Example File</h1>
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<span class="small-subtitle">mainwindows/recentfiles/mainwindow.cpp</span>
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<!-- $$$mainwindows/recentfiles/mainwindow.cpp-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/</span>
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<span class="preprocessor">#include <QtGui></span>
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<span class="preprocessor">#include "mainwindow.h"</span>
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MainWindow<span class="operator">::</span>MainWindow()
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{
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setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
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textEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtextedit.html">QTextEdit</a></span>;
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setCentralWidget(textEdit);
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createActions();
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createMenus();
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(<span class="type">void</span>)statusBar();
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setWindowFilePath(<span class="type"><a href="qstring.html">QString</a></span>());
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resize(<span class="number">400</span><span class="operator">,</span> <span class="number">300</span>);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>newFile()
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{
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MainWindow <span class="operator">*</span>other <span class="operator">=</span> <span class="keyword">new</span> MainWindow;
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other<span class="operator">-</span><span class="operator">></span>show();
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>open()
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{
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<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>);
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<span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
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loadFile(fileName);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>save()
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{
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<span class="keyword">if</span> (curFile<span class="operator">.</span>isEmpty())
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saveAs();
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<span class="keyword">else</span>
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saveFile(curFile);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>saveAs()
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{
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<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>);
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<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
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<span class="keyword">return</span>;
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saveFile(fileName);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>openRecentFile()
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{
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<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());
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<span class="keyword">if</span> (action)
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loadFile(action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>toString());
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>about()
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{
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<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>
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tr(<span class="string">"The <b>Recent Files</b> example demonstrates how to provide a "</span>
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<span class="string">"recently used file menu in a Qt application."</span>));
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>createActions()
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{
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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>);
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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);
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newAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Create a new file"</span>));
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connect(newAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(newFile()));
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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>);
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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);
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openAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Open an existing file"</span>));
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connect(openAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(open()));
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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>);
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|
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>));
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connect(saveAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(save()));
|
|
|
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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()));
|
|
|
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<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>
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|
<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> 2015 The Qt Company Ltd.
|
|
Documentation contributions included herein are the copyrights of
|
|
their respective owners.</p>
|
|
<br />
|
|
<p>
|
|
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.</p>
|
|
<p>
|
|
Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
|
www.qt-project.org</a>.</p>
|
|
<br />
|
|
<p>
|
|
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. <a title="Privacy Policy"
|
|
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
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