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qt4-x11/doc/html/tools-codecs-mainwindow-cpp.html
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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-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) 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;previewform.h&quot;</span>
MainWindow<span class="operator">::</span>MainWindow()
{
textEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtextedit.html">QTextEdit</a></span>;
textEdit<span class="operator">-</span><span class="operator">&gt;</span>setLineWrapMode(<span class="type"><a href="qtextedit.html">QTextEdit</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">&gt;</span>setCodecList(codecs);
createActions();
createMenus();
setWindowTitle(tr(<span class="string">&quot;Codecs&quot;</span>));
resize(<span class="number">500</span><span class="operator">,</span> <span class="number">400</span>);
}
<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="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="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">&quot;Codecs&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;Cannot read file %1:\n%2&quot;</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="qbytearray.html">QByteArray</a></span> data <span class="operator">=</span> file<span class="operator">.</span>readAll();
previewForm<span class="operator">-</span><span class="operator">&gt;</span>setEncodedData(data);
<span class="keyword">if</span> (previewForm<span class="operator">-</span><span class="operator">&gt;</span>exec())
textEdit<span class="operator">-</span><span class="operator">&gt;</span>setPlainText(previewForm<span class="operator">-</span><span class="operator">&gt;</span>decodedString());
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>save()
{
<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> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty()) {
<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">&quot;Codecs&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;Cannot write file %1:\n%2&quot;</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="qaction.html">QAction</a></span> <span class="operator">*</span>action <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span><span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(sender());
<span class="type"><a href="qbytearray.html">QByteArray</a></span> codecName <span class="operator">=</span> action<span class="operator">-</span><span class="operator">&gt;</span>data()<span class="operator">.</span>toByteArray();
<span class="type"><a href="qtextstream.html">QTextStream</a></span> out(<span class="operator">&amp;</span>file);
out<span class="operator">.</span>setCodec(codecName);
out <span class="operator">&lt;</span><span class="operator">&lt;</span> textEdit<span class="operator">-</span><span class="operator">&gt;</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">&quot;About Codecs&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;The &lt;b&gt;Codecs&lt;/b&gt; example demonstrates how to read and write &quot;</span>
<span class="string">&quot;files using various encodings.&quot;</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>aboutToShowSaveAsMenu()
{
<span class="type"><a href="qstring.html">QString</a></span> currentText <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">&gt;</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="qbytearray.html">QByteArray</a></span> codecName <span class="operator">=</span> action<span class="operator">-</span><span class="operator">&gt;</span>data()<span class="operator">.</span>toByteArray();
<span class="type"><a href="qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span>codec <span class="operator">=</span> <span class="type"><a href="qtextcodec.html">QTextCodec</a></span><span class="operator">::</span>codecForName(codecName);
action<span class="operator">-</span><span class="operator">&gt;</span>setVisible(codec <span class="operator">&amp;</span><span class="operator">&amp;</span> codec<span class="operator">-</span><span class="operator">&gt;</span>canEncode(currentText));
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>findCodecs()
{
<span class="type"><a href="qmap.html">QMap</a></span><span class="operator">&lt;</span><span class="type"><a href="qstring.html">QString</a></span><span class="operator">,</span> <span class="type"><a href="qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span><span class="operator">&gt;</span> codecMap;
<span class="type"><a href="qregexp.html">QRegExp</a></span> iso8859RegExp(<span class="string">&quot;ISO[- ]8859-([0-9]+).*&quot;</span>);
foreach (<span class="type">int</span> mib<span class="operator">,</span> <span class="type"><a href="qtextcodec.html">QTextCodec</a></span><span class="operator">::</span>availableMibs()) {
<span class="type"><a href="qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span>codec <span class="operator">=</span> <span class="type"><a href="qtextcodec.html">QTextCodec</a></span><span class="operator">::</span>codecForMib(mib);
<span class="type"><a href="qstring.html">QString</a></span> sortKey <span class="operator">=</span> codec<span class="operator">-</span><span class="operator">&gt;</span>name()<span class="operator">.</span>toUpper();
<span class="type">int</span> rank;
<span class="keyword">if</span> (sortKey<span class="operator">.</span>startsWith(<span class="string">&quot;UTF-8&quot;</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(<span class="string">&quot;UTF-16&quot;</span>)) {
rank <span class="operator">=</span> <span class="number">2</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (iso8859RegExp<span class="operator">.</span>exactMatch(sortKey)) {
<span class="keyword">if</span> (iso8859RegExp<span class="operator">.</span>cap(<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(<span class="type"><a href="qchar.html">QChar</a></span>(<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>createActions()
{
openAct <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;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);
connect(openAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(open()));
foreach (<span class="type"><a href="qtextcodec.html">QTextCodec</a></span> <span class="operator">*</span>codec<span class="operator">,</span> codecs) {
<span class="type"><a href="qstring.html">QString</a></span> text <span class="operator">=</span> tr(<span class="string">&quot;%1...&quot;</span>)<span class="operator">.</span>arg(<span class="type"><a href="qstring.html">QString</a></span>(codec<span class="operator">-</span><span class="operator">&gt;</span>name()));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(text<span class="operator">,</span> <span class="keyword">this</span>);
action<span class="operator">-</span><span class="operator">&gt;</span>setData(codec<span class="operator">-</span><span class="operator">&gt;</span>name());
connect(action<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(save()));
saveAsActs<span class="operator">.</span>append(action);
}
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);
connect(exitAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
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>);
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>);
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()
{
saveAsMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">&quot;&amp;Save As&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
foreach (<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action<span class="operator">,</span> saveAsActs)
saveAsMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(action);
connect(saveAsMenu<span class="operator">,</span> SIGNAL(aboutToShow())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(aboutToShowSaveAsMenu()));
fileMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">&quot;&amp;File&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(openAct);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addMenu(saveAsMenu);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(exitAct);
helpMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">&quot;&amp;Help&quot;</span>)<span class="operator">,</span> <span class="keyword">this</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);
menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(fileMenu);
menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(helpMenu);
}</pre>
</div>
<!-- @@@tools/codecs/mainwindow.cpp -->
</div>
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