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<h1 class="title">languagechooser.cpp Example File</h1>
<span class="subtitle">tools/i18n/languagechooser.cpp</span>
<!-- $$$tools/i18n/languagechooser.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:
  **
  ** &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;QtWidgets&gt;</span>

  <span class="preprocessor">#include &quot;languagechooser.h&quot;</span>
  <span class="preprocessor">#include &quot;mainwindow.h&quot;</span>

  <span class="preprocessor">#if 0 // Used to be included in Qt4 for Q_WS_MAC</span>
  <span class="keyword">extern</span> <span class="type">void</span> qt_mac_set_menubar_merge(bool merge);

  <span class="preprocessor">#endif</span>

  LanguageChooser<span class="operator">::</span>LanguageChooser(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">&amp;</span> defaultLang<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qdialog.html">QDialog</a></span>(parent<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WindowStaysOnTopHint)
  {
      groupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(<span class="string">&quot;Languages&quot;</span>);

      <span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>groupBoxLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;

      <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> qmFiles <span class="operator">=</span> findQmFiles();
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> qmFiles<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
          <span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>checkBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>(languageName(qmFiles<span class="operator">[</span>i<span class="operator">]</span>));
          qmFileForCheckBoxMap<span class="operator">.</span>insert(checkBox<span class="operator">,</span> qmFiles<span class="operator">[</span>i<span class="operator">]</span>);
          connect(checkBox<span class="operator">,</span>
                  <span class="type">QOverload</span><span class="operator">&lt;</span>bool<span class="operator">&gt;</span><span class="operator">::</span>of(<span class="operator">&amp;</span><span class="type"><a href="qcheckbox.html">QCheckBox</a></span><span class="operator">::</span>toggled)<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span>
                  <span class="operator">&amp;</span>LanguageChooser<span class="operator">::</span>checkBoxToggled);
          <span class="keyword">if</span> (languageMatch(defaultLang<span class="operator">,</span> qmFiles<span class="operator">[</span>i<span class="operator">]</span>))
                  checkBox<span class="operator">-</span><span class="operator">&gt;</span>setCheckState(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked);
          groupBoxLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(checkBox<span class="operator">,</span> i <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> i <span class="operator">%</span> <span class="number">2</span>);
      }
      groupBox<span class="operator">-</span><span class="operator">&gt;</span>setLayout(groupBoxLayout);

      buttonBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span>;

      showAllButton <span class="operator">=</span> buttonBox<span class="operator">-</span><span class="operator">&gt;</span>addButton(<span class="string">&quot;Show All&quot;</span><span class="operator">,</span>
                                           <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>ActionRole);
      hideAllButton <span class="operator">=</span> buttonBox<span class="operator">-</span><span class="operator">&gt;</span>addButton(<span class="string">&quot;Hide All&quot;</span><span class="operator">,</span>
                                           <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>ActionRole);

      connect(showAllButton<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qabstractbutton.html">QAbstractButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>LanguageChooser<span class="operator">::</span>showAll);
      connect(hideAllButton<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qabstractbutton.html">QAbstractButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>LanguageChooser<span class="operator">::</span>hideAll);

      <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(groupBox);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(buttonBox);
      setLayout(mainLayout);

  <span class="preprocessor">#if 0 // Used to be included in Qt4 for Q_WS_MAC</span>
      qt_mac_set_menubar_merge(<span class="keyword">false</span>);
  <span class="preprocessor">#endif</span>

      setWindowTitle(<span class="string">&quot;I18N&quot;</span>);
  }

  bool LanguageChooser<span class="operator">::</span>languageMatch(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">&amp;</span> lang<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">&amp;</span> qmFile)
  {
      <span class="comment">//qmFile: i18n_xx.qm</span>
      <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> prefix <span class="operator">=</span> <span class="string">&quot;i18n_&quot;</span>;
      <span class="keyword">const</span> <span class="type">int</span> langTokenLength <span class="operator">=</span> <span class="number">2</span>; <span class="comment">/*FIXME: is checking two chars enough?*/</span>
      <span class="keyword">return</span> qmFile<span class="operator">.</span>midRef(qmFile<span class="operator">.</span>indexOf(prefix) <span class="operator">+</span> prefix<span class="operator">.</span>length()<span class="operator">,</span> langTokenLength) <span class="operator">=</span><span class="operator">=</span> lang<span class="operator">.</span>leftRef(langTokenLength);
  }

  bool LanguageChooser<span class="operator">::</span>eventFilter(<span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>object<span class="operator">,</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>Close) {
          MainWindow <span class="operator">*</span>window <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>MainWindow <span class="operator">*</span><span class="operator">&gt;</span>(object);
          <span class="keyword">if</span> (window) {
              <span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>checkBox <span class="operator">=</span> mainWindowForCheckBoxMap<span class="operator">.</span>key(window);
              <span class="keyword">if</span> (checkBox)
                  checkBox<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">false</span>);
          }
      }
      <span class="keyword">return</span> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>eventFilter(object<span class="operator">,</span> event);
  }

  <span class="type">void</span> LanguageChooser<span class="operator">::</span>closeEvent(<span class="type"><a href="../qtgui/qcloseevent.html">QCloseEvent</a></span> <span class="operator">*</span> <span class="comment">/* event */</span>)
  {
      <a href="qapplication.html#qApp">qApp</a><span class="operator">-</span><span class="operator">&gt;</span>quit();
  }

  <span class="type">void</span> LanguageChooser<span class="operator">::</span>checkBoxToggled()
  {
      <span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>checkBox <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span><span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(sender());
      MainWindow <span class="operator">*</span>window <span class="operator">=</span> mainWindowForCheckBoxMap<span class="operator">[</span>checkBox<span class="operator">]</span>;
      <span class="keyword">if</span> (<span class="operator">!</span>window) {
          <span class="type"><a href="../qtcore/qtranslator.html">QTranslator</a></span> translator;
          translator<span class="operator">.</span>load(qmFileForCheckBoxMap<span class="operator">[</span>checkBox<span class="operator">]</span>);
          <a href="qapplication.html#qApp">qApp</a><span class="operator">-</span><span class="operator">&gt;</span>installTranslator(<span class="operator">&amp;</span>translator);

          window <span class="operator">=</span> <span class="keyword">new</span> MainWindow;
          window<span class="operator">-</span><span class="operator">&gt;</span>setPalette(colorForLanguage(checkBox<span class="operator">-</span><span class="operator">&gt;</span>text()));

          window<span class="operator">-</span><span class="operator">&gt;</span>installEventFilter(<span class="keyword">this</span>);
          mainWindowForCheckBoxMap<span class="operator">.</span>insert(checkBox<span class="operator">,</span> window);
      }
      window<span class="operator">-</span><span class="operator">&gt;</span>setVisible(checkBox<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
  }

  <span class="type">void</span> LanguageChooser<span class="operator">::</span>showAll()
  {
      foreach (<span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>checkBox<span class="operator">,</span> qmFileForCheckBoxMap<span class="operator">.</span>keys())
          checkBox<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">true</span>);
  }

  <span class="type">void</span> LanguageChooser<span class="operator">::</span>hideAll()
  {
      foreach (<span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>checkBox<span class="operator">,</span> qmFileForCheckBoxMap<span class="operator">.</span>keys())
          checkBox<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">false</span>);
  }

  <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> LanguageChooser<span class="operator">::</span>findQmFiles()
  {
      <span class="type"><a href="../qtcore/qdir.html">QDir</a></span> dir(<span class="string">&quot;:/translations&quot;</span>);
      <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> fileNames <span class="operator">=</span> dir<span class="operator">.</span>entryList(<span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span>(<span class="string">&quot;*.qm&quot;</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>Files<span class="operator">,</span>
                                            <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>Name);
      <span class="type"><a href="../qtcore/qstringlist.html#QMutableStringListIterator-typedef">QMutableStringListIterator</a></span> i(fileNames);
      <span class="keyword">while</span> (i<span class="operator">.</span>hasNext()) {
          i<span class="operator">.</span>next();
          i<span class="operator">.</span>setValue(dir<span class="operator">.</span>filePath(i<span class="operator">.</span>value()));
      }
      <span class="keyword">return</span> fileNames;
  }

  <span class="type"><a href="../qtcore/qstring.html">QString</a></span> LanguageChooser<span class="operator">::</span>languageName(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>qmFile)
  {
      <span class="type"><a href="../qtcore/qtranslator.html">QTranslator</a></span> translator;
      translator<span class="operator">.</span>load(qmFile);

      <span class="keyword">return</span> translator<span class="operator">.</span>translate(<span class="string">&quot;MainWindow&quot;</span><span class="operator">,</span> <span class="string">&quot;English&quot;</span>);
  }

  <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> LanguageChooser<span class="operator">::</span>colorForLanguage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>language)
  {
      <span class="type"><a href="../qtcore/qtglobal.html#uint-typedef">uint</a></span> hashValue <span class="operator">=</span> <a href="qsizepolicy.html#qHash">qHash</a>(language);
      <span class="type">int</span> red <span class="operator">=</span> <span class="number">156</span> <span class="operator">+</span> (hashValue <span class="operator">&amp;</span> <span class="number">0x3F</span>);
      <span class="type">int</span> green <span class="operator">=</span> <span class="number">156</span> <span class="operator">+</span> ((hashValue <span class="operator">&gt;</span><span class="operator">&gt;</span> <span class="number">6</span>) <span class="operator">&amp;</span> <span class="number">0x3F</span>);
      <span class="type">int</span> blue <span class="operator">=</span> <span class="number">156</span> <span class="operator">+</span> ((hashValue <span class="operator">&gt;</span><span class="operator">&gt;</span> <span class="number">12</span>) <span class="operator">&amp;</span> <span class="number">0x3F</span>);
      <span class="keyword">return</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(red<span class="operator">,</span> green<span class="operator">,</span> blue);
  }

</pre>
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<!-- @@@tools/i18n/languagechooser.cpp -->
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