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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">tools/treemodelcompleter/mainwindow.cpp</span>
<!-- $$$tools/treemodelcompleter/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:
  **
  ** &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;treemodelcompleter.h&quot;</span>
  <span class="preprocessor">#include &quot;mainwindow.h&quot;</span>

  MainWindow<span class="operator">::</span>MainWindow(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(parent)<span class="operator">,</span> completer(<span class="number">0</span>)<span class="operator">,</span> lineEdit(<span class="number">0</span>)
  {
      createMenu();

      completer <span class="operator">=</span> <span class="keyword">new</span> TreeModelCompleter(<span class="keyword">this</span>);
      completer<span class="operator">-</span><span class="operator">&gt;</span>setModel(modelFromFile(<span class="string">&quot;:/resources/treemodel.txt&quot;</span>));
      completer<span class="operator">-</span><span class="operator">&gt;</span>setSeparator(QLatin1String(<span class="string">&quot;.&quot;</span>));
      <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>connect(completer<span class="operator">,</span> SIGNAL(highlighted(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>))<span class="operator">,</span>
                       <span class="keyword">this</span><span class="operator">,</span> SLOT(highlight(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>)));

      <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>centralWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;

      <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>modelLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
      modelLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Tree Model&lt;br&gt;(Double click items to edit)&quot;</span>));

      <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>modeLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
      modeLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Completion Mode&quot;</span>));
      modeCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
      modeCombo<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Inline&quot;</span>));
      modeCombo<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Filtered Popup&quot;</span>));
      modeCombo<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Unfiltered Popup&quot;</span>));
      modeCombo<span class="operator">-</span><span class="operator">&gt;</span>setCurrentIndex(<span class="number">1</span>);

      <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>caseLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
      caseLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Case Sensitivity&quot;</span>));
      caseCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
      caseCombo<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Case Insensitive&quot;</span>));
      caseCombo<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Case Sensitive&quot;</span>));
      caseCombo<span class="operator">-</span><span class="operator">&gt;</span>setCurrentIndex(<span class="number">0</span>);

      <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>separatorLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
      separatorLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Tree Separator&quot;</span>));

      <span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>separatorLineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>;
      separatorLineEdit<span class="operator">-</span><span class="operator">&gt;</span>setText(completer<span class="operator">-</span><span class="operator">&gt;</span>separator());
      connect(separatorLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
              completer<span class="operator">,</span> SLOT(setSeparator(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>)));

      <span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>wrapCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>;
      wrapCheckBox<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Wrap around completions&quot;</span>));
      wrapCheckBox<span class="operator">-</span><span class="operator">&gt;</span>setChecked(completer<span class="operator">-</span><span class="operator">&gt;</span>wrapAround());
      connect(wrapCheckBox<span class="operator">,</span> SIGNAL(clicked(bool))<span class="operator">,</span> completer<span class="operator">,</span> SLOT(setWrapAround(bool)));

      contentsLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
      contentsLabel<span class="operator">-</span><span class="operator">&gt;</span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Fixed<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Fixed);
      connect(separatorLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(updateContentsLabel(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>)));

      treeView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtreeview.html">QTreeView</a></span>;
      treeView<span class="operator">-</span><span class="operator">&gt;</span>setModel(completer<span class="operator">-</span><span class="operator">&gt;</span>model());
      treeView<span class="operator">-</span><span class="operator">&gt;</span>header()<span class="operator">-</span><span class="operator">&gt;</span>hide();
      treeView<span class="operator">-</span><span class="operator">&gt;</span>expandAll();

      connect(modeCombo<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(changeMode(<span class="type">int</span>)));
      connect(caseCombo<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(changeCase(<span class="type">int</span>)));

      lineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>;
      lineEdit<span class="operator">-</span><span class="operator">&gt;</span>setCompleter(completer);

      <span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
      layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(modelLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(treeView<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
      layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(modeLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);  layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(modeCombo<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
      layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(caseLabel<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span>);  layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(caseCombo<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span>);
      layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(separatorLabel<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">0</span>); layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(separatorLineEdit<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span>);
      layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(wrapCheckBox<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">0</span>);
      layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(contentsLabel<span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
      layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(lineEdit<span class="operator">,</span> <span class="number">6</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
      centralWidget<span class="operator">-</span><span class="operator">&gt;</span>setLayout(layout);
      setCentralWidget(centralWidget);

      changeCase(caseCombo<span class="operator">-</span><span class="operator">&gt;</span>currentIndex());
      changeMode(modeCombo<span class="operator">-</span><span class="operator">&gt;</span>currentIndex());

      setWindowTitle(tr(<span class="string">&quot;Tree Model Completer&quot;</span>));
      lineEdit<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>createMenu()
  {
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>exitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Exit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>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;About&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>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 Qt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);

      connect(exitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(quit()));
      connect(aboutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
      connect(aboutQtAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));

      <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">&gt;</span>addMenu(tr(<span class="string">&quot;File&quot;</span>));
      fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(exitAction);

      <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">&gt;</span>addMenu(tr(<span class="string">&quot;About&quot;</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);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>changeMode(<span class="type">int</span> index)
  {
      <span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>CompletionMode mode;
      <span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
          mode <span class="operator">=</span> <span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>InlineCompletion;
      <span class="keyword">else</span> <span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>)
          mode <span class="operator">=</span> <span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>PopupCompletion;
      <span class="keyword">else</span>
          mode <span class="operator">=</span> <span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>UnfilteredPopupCompletion;

      completer<span class="operator">-</span><span class="operator">&gt;</span>setCompletionMode(mode);
  }

  <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>MainWindow<span class="operator">::</span>modelFromFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">&amp;</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="keyword">return</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qstringlistmodel.html">QStringListModel</a></span>(completer);

  <span class="preprocessor">#ifndef QT_NO_CURSOR</span>
      <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>setOverrideCursor(<span class="type"><a href="../qtgui/qcursor.html">QCursor</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WaitCursor));
  <span class="preprocessor">#endif</span>
      <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> words;

      <span class="type"><a href="../qtgui/qstandarditemmodel.html">QStandardItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qstandarditemmodel.html">QStandardItemModel</a></span>(completer);
      <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qstandarditem.html">QStandardItem</a></span> <span class="operator">*</span><span class="operator">&gt;</span> parents(<span class="number">10</span>);
      parents<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> model<span class="operator">-</span><span class="operator">&gt;</span>invisibleRootItem();

      <span class="keyword">while</span> (<span class="operator">!</span>file<span class="operator">.</span>atEnd()) {
          <span class="type"><a href="../qtcore/qstring.html">QString</a></span> line <span class="operator">=</span> file<span class="operator">.</span>readLine();
          <span class="type"><a href="../qtcore/qstring.html">QString</a></span> trimmedLine <span class="operator">=</span> line<span class="operator">.</span>trimmed();
          <span class="keyword">if</span> (line<span class="operator">.</span>isEmpty() <span class="operator">|</span><span class="operator">|</span> trimmedLine<span class="operator">.</span>isEmpty())
              <span class="keyword">continue</span>;

          <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span> re(<span class="string">&quot;^\\s+&quot;</span>);
          <span class="type"><a href="../qtcore/qregularexpressionmatch.html">QRegularExpressionMatch</a></span> match <span class="operator">=</span> re<span class="operator">.</span>match(line);
          <span class="type">int</span> nonws <span class="operator">=</span> match<span class="operator">.</span>capturedStart();
          <span class="type">int</span> level <span class="operator">=</span> <span class="number">0</span>;
          <span class="keyword">if</span> (nonws <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
              level <span class="operator">=</span> <span class="number">0</span>;
          } <span class="keyword">else</span> {
              <span class="keyword">if</span> (line<span class="operator">.</span>startsWith(<span class="string">&quot;\t&quot;</span>)) {
                  level <span class="operator">=</span> match<span class="operator">.</span>capturedLength();
              } <span class="keyword">else</span> {
                  level <span class="operator">=</span> match<span class="operator">.</span>capturedLength()<span class="operator">/</span><span class="number">4</span>;
              }
          }

          <span class="keyword">if</span> (level<span class="operator">+</span><span class="number">1</span> <span class="operator">&gt;</span><span class="operator">=</span> parents<span class="operator">.</span>size())
              parents<span class="operator">.</span>resize(parents<span class="operator">.</span>size()<span class="operator">*</span><span class="number">2</span>);

          <span class="type"><a href="../qtgui/qstandarditem.html">QStandardItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qstandarditem.html">QStandardItem</a></span>;
          item<span class="operator">-</span><span class="operator">&gt;</span>setText(trimmedLine);
          parents<span class="operator">[</span>level<span class="operator">]</span><span class="operator">-</span><span class="operator">&gt;</span>appendRow(item);
          parents<span class="operator">[</span>level<span class="operator">+</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> item;
      }

  <span class="preprocessor">#ifndef QT_NO_CURSOR</span>
      <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>restoreOverrideCursor();
  <span class="preprocessor">#endif</span>

      <span class="keyword">return</span> model;
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>highlight(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>index)
  {
      <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>completionModel <span class="operator">=</span> completer<span class="operator">-</span><span class="operator">&gt;</span>completionModel();
      <span class="type"><a href="../qtcore/qabstractproxymodel.html">QAbstractProxyModel</a></span> <span class="operator">*</span>proxy <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span><span class="type"><a href="../qtcore/qabstractproxymodel.html">QAbstractProxyModel</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(completionModel);
      <span class="keyword">if</span> (<span class="operator">!</span>proxy)
          <span class="keyword">return</span>;
      <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> sourceIndex <span class="operator">=</span> proxy<span class="operator">-</span><span class="operator">&gt;</span>mapToSource(index);
      treeView<span class="operator">-</span><span class="operator">&gt;</span>selectionModel()<span class="operator">-</span><span class="operator">&gt;</span>select(sourceIndex<span class="operator">,</span> <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>ClearAndSelect <span class="operator">|</span> <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>Rows);
      treeView<span class="operator">-</span><span class="operator">&gt;</span>scrollTo(index);
  }

  <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&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;This example demonstrates how &quot;</span>
          <span class="string">&quot;to use a QCompleter with a custom tree model.&quot;</span>));
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>changeCase(<span class="type">int</span> cs)
  {
      completer<span class="operator">-</span><span class="operator">&gt;</span>setCaseSensitivity(cs <span class="operator">?</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CaseSensitive : <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CaseInsensitive);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>updateContentsLabel(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">&amp;</span> sep)
  {
      contentsLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Type path from model above with items at each level separated by a '%1'&quot;</span>)<span class="operator">.</span>arg(sep));
  }

</pre>
</div>
<!-- @@@tools/treemodelcompleter/mainwindow.cpp -->
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