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<h1 class="title">mdichild.cpp Example File</h1>
<span class="subtitle">mainwindows/mdi/mdichild.cpp</span>
<!-- $$$mainwindows/mdi/mdichild.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 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
** "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 <QtWidgets></span>
<span class="preprocessor">#include "mdichild.h"</span>
MdiChild<span class="operator">::</span>MdiChild()
{
setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
isUntitled <span class="operator">=</span> <span class="keyword">true</span>;
}
<span class="type">void</span> MdiChild<span class="operator">::</span>newFile()
{
<span class="keyword">static</span> <span class="type">int</span> sequenceNumber <span class="operator">=</span> <span class="number">1</span>;
isUntitled <span class="operator">=</span> <span class="keyword">true</span>;
curFile <span class="operator">=</span> tr(<span class="string">"document%1.txt"</span>)<span class="operator">.</span>arg(sequenceNumber<span class="operator">+</span><span class="operator">+</span>);
setWindowTitle(curFile <span class="operator">+</span> <span class="string">"[*]"</span>);
connect(document()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtgui/qtextdocument.html">QTextDocument</a></span><span class="operator">::</span>contentsChanged<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MdiChild<span class="operator">::</span>documentWasModified);
}
bool MdiChild<span class="operator">::</span>loadFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
<span class="type"><a href="../qtcore/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="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/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">"MDI"</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="keyword">false</span>;
}
<span class="type"><a href="../qtcore/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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WaitCursor);
setPlainText(in<span class="operator">.</span>readAll());
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>restoreOverrideCursor();
setCurrentFile(fileName);
connect(document()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtgui/qtextdocument.html">QTextDocument</a></span><span class="operator">::</span>contentsChanged<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MdiChild<span class="operator">::</span>documentWasModified);
<span class="keyword">return</span> <span class="keyword">true</span>;
}
bool MdiChild<span class="operator">::</span>save()
{
<span class="keyword">if</span> (isUntitled) {
<span class="keyword">return</span> saveAs();
} <span class="keyword">else</span> {
<span class="keyword">return</span> saveFile(curFile);
}
}
bool MdiChild<span class="operator">::</span>saveAs()
{
<span class="type"><a href="../qtcore/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="operator">,</span> tr(<span class="string">"Save As"</span>)<span class="operator">,</span>
curFile);
<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="keyword">return</span> saveFile(fileName);
}
bool MdiChild<span class="operator">::</span>saveFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
<span class="type"><a href="../qtcore/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="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/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">"MDI"</span>)<span class="operator">,</span>
tr(<span class="string">"Cannot write file %1:\n%2."</span>)
<span class="operator">.</span>arg(<span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(fileName)<span class="operator">,</span> file<span class="operator">.</span>errorString()));
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="type"><a href="../qtcore/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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WaitCursor);
out <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);
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> MdiChild<span class="operator">::</span>userFriendlyCurrentFile()
{
<span class="keyword">return</span> strippedName(curFile);
}
<span class="type">void</span> MdiChild<span class="operator">::</span>closeEvent(<span class="type"><a href="../qtgui/qcloseevent.html">QCloseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (maybeSave()) {
event<span class="operator">-</span><span class="operator">></span>accept();
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>ignore();
}
}
<span class="type">void</span> MdiChild<span class="operator">::</span>documentWasModified()
{
setWindowModified(document()<span class="operator">-</span><span class="operator">></span>isModified());
}
bool MdiChild<span class="operator">::</span>maybeSave()
{
<span class="keyword">if</span> (<span class="operator">!</span>document()<span class="operator">-</span><span class="operator">></span>isModified())
<span class="keyword">return</span> <span class="keyword">true</span>;
<span class="keyword">const</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>StandardButton ret
<span class="operator">=</span> <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">"MDI"</span>)<span class="operator">,</span>
tr(<span class="string">"'%1' has been modified.\n"</span>
<span class="string">"Do you want to save your changes?"</span>)
<span class="operator">.</span>arg(userFriendlyCurrentFile())<span class="operator">,</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Save <span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Discard
<span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel);
<span class="keyword">switch</span> (ret) {
<span class="keyword">case</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Save:
<span class="keyword">return</span> save();
<span class="keyword">case</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel:
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">void</span> MdiChild<span class="operator">::</span>setCurrentFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
curFile <span class="operator">=</span> <span class="type"><a href="../qtcore/qfileinfo.html">QFileInfo</a></span>(fileName)<span class="operator">.</span>canonicalFilePath();
isUntitled <span class="operator">=</span> <span class="keyword">false</span>;
document()<span class="operator">-</span><span class="operator">></span>setModified(<span class="keyword">false</span>);
setWindowModified(<span class="keyword">false</span>);
setWindowTitle(userFriendlyCurrentFile() <span class="operator">+</span> <span class="string">"[*]"</span>);
}
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> MdiChild<span class="operator">::</span>strippedName(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fullFileName)
{
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qfileinfo.html">QFileInfo</a></span>(fullFileName)<span class="operator">.</span>fileName();
}
</pre>
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<!-- @@@mainwindows/mdi/mdichild.cpp -->
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