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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">tools/codecs/mainwindow.cpp</span>
<!-- $$$tools/codecs/mainwindow.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 "mainwindow.h"</span>
<span class="preprocessor">#include "previewform.h"</span>
MainWindow<span class="operator">::</span>MainWindow()
{
textEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span>;
textEdit<span class="operator">-</span><span class="operator">></span>setLineWrapMode(<span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>NoWrap);
setCentralWidget(textEdit);
findCodecs();
previewForm <span class="operator">=</span> <span class="keyword">new</span> PreviewForm(<span class="keyword">this</span>);
previewForm<span class="operator">-</span><span class="operator">></span>setCodecList(codecs);
createMenus();
setWindowTitle(tr(<span class="string">"Codecs"</span>));
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> screenGeometry <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">-</span><span class="operator">></span>screenGeometry(<span class="keyword">this</span>);
resize(screenGeometry<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> screenGeometry<span class="operator">.</span>height() <span class="operator">*</span> <span class="number">2</span> <span class="operator">/</span> <span class="number">3</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>open()
{
<span class="keyword">const</span> <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>getOpenFileName(<span class="keyword">this</span>);
<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
<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="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">"Codecs"</span>)<span class="operator">,</span>
tr(<span class="string">"Cannot read 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">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> data <span class="operator">=</span> file<span class="operator">.</span>readAll();
previewForm<span class="operator">-</span><span class="operator">></span>setWindowTitle(tr(<span class="string">"Choose Encoding for %1"</span>)<span class="operator">.</span>arg(<span class="type"><a href="../qtcore/qfileinfo.html">QFileInfo</a></span>(fileName)<span class="operator">.</span>fileName()));
previewForm<span class="operator">-</span><span class="operator">></span>setEncodedData(data);
<span class="keyword">if</span> (previewForm<span class="operator">-</span><span class="operator">></span>exec())
textEdit<span class="operator">-</span><span class="operator">></span>setPlainText(previewForm<span class="operator">-</span><span class="operator">></span>decodedString());
}
<span class="type">void</span> MainWindow<span class="operator">::</span>save()
{
<span class="keyword">const</span> <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="keyword">const</span> <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span><span class="operator">></span>(sender());
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> codecName <span class="operator">=</span> action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>toByteArray();
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> title <span class="operator">=</span> tr(<span class="string">"Save As (%1)"</span>)<span class="operator">.</span>arg(QLatin1String(codecName));
<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> title);
<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
<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">"Codecs"</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="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> out(<span class="operator">&</span>file);
out<span class="operator">.</span>setCodec(codecName<span class="operator">.</span>constData());
out <span class="operator"><</span><span class="operator"><</span> textEdit<span class="operator">-</span><span class="operator">></span>toPlainText();
}
<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 Codecs"</span>)<span class="operator">,</span>
tr(<span class="string">"The <b>Codecs</b> example demonstrates how to read and write "</span>
<span class="string">"files using various encodings."</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>aboutToShowSaveAsMenu()
{
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> currentText <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">></span>toPlainText();
foreach (<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action<span class="operator">,</span> saveAsActs) {
<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> codecName <span class="operator">=</span> action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>toByteArray();
<span class="type"><a href="../qtcore/qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span>codec <span class="operator">=</span> <span class="type"><a href="../qtcore/qtextcodec.html">QTextCodec</a></span><span class="operator">::</span>codecForName(codecName);
action<span class="operator">-</span><span class="operator">></span>setVisible(codec <span class="operator">&</span><span class="operator">&</span> codec<span class="operator">-</span><span class="operator">></span>canEncode(currentText));
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>findCodecs()
{
<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span><span class="operator">></span> codecMap;
<span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span> iso8859RegExp(<span class="string">"^ISO[- ]8859-([0-9]+).*$"</span>);
<span class="type"><a href="../qtcore/qregularexpressionmatch.html">QRegularExpressionMatch</a></span> match;
foreach (<span class="type">int</span> mib<span class="operator">,</span> <span class="type"><a href="../qtcore/qtextcodec.html">QTextCodec</a></span><span class="operator">::</span>availableMibs()) {
<span class="type"><a href="../qtcore/qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span>codec <span class="operator">=</span> <span class="type"><a href="../qtcore/qtextcodec.html">QTextCodec</a></span><span class="operator">::</span>codecForMib(mib);
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> sortKey <span class="operator">=</span> codec<span class="operator">-</span><span class="operator">></span>name()<span class="operator">.</span>toUpper();
<span class="type">int</span> rank;
<span class="keyword">if</span> (sortKey<span class="operator">.</span>startsWith(QLatin1String(<span class="string">"UTF-8"</span>))) {
rank <span class="operator">=</span> <span class="number">1</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (sortKey<span class="operator">.</span>startsWith(QLatin1String(<span class="string">"UTF-16"</span>))) {
rank <span class="operator">=</span> <span class="number">2</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> ((match <span class="operator">=</span> iso8859RegExp<span class="operator">.</span>match(sortKey))<span class="operator">.</span>hasMatch()) {
<span class="keyword">if</span> (match<span class="operator">.</span>captured(<span class="number">1</span>)<span class="operator">.</span>size() <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>)
rank <span class="operator">=</span> <span class="number">3</span>;
<span class="keyword">else</span>
rank <span class="operator">=</span> <span class="number">4</span>;
} <span class="keyword">else</span> {
rank <span class="operator">=</span> <span class="number">5</span>;
}
sortKey<span class="operator">.</span>prepend(QLatin1Char(<span class="char">'0'</span> <span class="operator">+</span> rank));
codecMap<span class="operator">.</span>insert(sortKey<span class="operator">,</span> codec);
}
codecs <span class="operator">=</span> codecMap<span class="operator">.</span>values();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createMenus()
{
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&File"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>openAct <span class="operator">=</span>
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Open..."</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>open);
openAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>saveAsMenu <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Save As"</span>));
connect(saveAsMenu<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmenu.html">QMenu</a></span><span class="operator">::</span>aboutToShow<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>aboutToShowSaveAsMenu);
foreach (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span>codec<span class="operator">,</span> codecs) {
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> name <span class="operator">=</span> codec<span class="operator">-</span><span class="operator">></span>name();
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action <span class="operator">=</span> saveAsMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"%1..."</span>)<span class="operator">.</span>arg(QLatin1String(name)));
action<span class="operator">-</span><span class="operator">></span>setData(<span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(name));
connect(action<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>save);
saveAsActs<span class="operator">.</span>append(action);
}
fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator();
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>exitAct <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"E&xit"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>close);
exitAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
menuBar()<span class="operator">-</span><span class="operator">></span>addSeparator();
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>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(tr(<span class="string">"&About"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>about);
helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"About &Qt"</span>)<span class="operator">,</span> qApp<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>aboutQt);
}
</pre>
</div>
<!-- @@@tools/codecs/mainwindow.cpp -->
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