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<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-itemviews-chart-example.html">Chart Example</a></td><td >mainwindow.cpp Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">itemviews/chart/mainwindow.cpp</span>
<!-- $$$itemviews/chart/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;pieview.h&quot;</span>
  <span class="preprocessor">#include &quot;mainwindow.h&quot;</span>

  MainWindow<span class="operator">::</span>MainWindow()
  {
      <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>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>);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>openAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;Open...&quot;</span>));
      openAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>saveAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;Save As...&quot;</span>));
      saveAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>SaveAs);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>quitAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;E&amp;xit&quot;</span>));
      quitAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);

      setupModel();
      setupViews();

      connect(openAction<span class="operator">,</span> <span class="operator">&amp;</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">&amp;</span>MainWindow<span class="operator">::</span>openFile);
      connect(saveAction<span class="operator">,</span> <span class="operator">&amp;</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">&amp;</span>MainWindow<span class="operator">::</span>saveFile);
      connect(quitAction<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> qApp<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>quit);

      menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(fileMenu);
      statusBar();

      loadFile(<span class="string">&quot;:/Charts/qtdata.cht&quot;</span>);

      setWindowTitle(tr(<span class="string">&quot;Chart&quot;</span>));
      resize(<span class="number">870</span><span class="operator">,</span> <span class="number">550</span>);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>setupModel()
  {
      model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qstandarditemmodel.html">QStandardItemModel</a></span>(<span class="number">8</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="keyword">this</span>);
      model<span class="operator">-</span><span class="operator">&gt;</span>setHeaderData(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">&quot;Label&quot;</span>));
      model<span class="operator">-</span><span class="operator">&gt;</span>setHeaderData(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">&quot;Quantity&quot;</span>));
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>setupViews()
  {
      <span class="type"><a href="qsplitter.html">QSplitter</a></span> <span class="operator">*</span>splitter <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsplitter.html">QSplitter</a></span>;
      <span class="type"><a href="qtableview.html">QTableView</a></span> <span class="operator">*</span>table <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtableview.html">QTableView</a></span>;
      pieChart <span class="operator">=</span> <span class="keyword">new</span> PieView;
      splitter<span class="operator">-</span><span class="operator">&gt;</span>addWidget(table);
      splitter<span class="operator">-</span><span class="operator">&gt;</span>addWidget(pieChart);
      splitter<span class="operator">-</span><span class="operator">&gt;</span>setStretchFactor(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
      splitter<span class="operator">-</span><span class="operator">&gt;</span>setStretchFactor(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);

      table<span class="operator">-</span><span class="operator">&gt;</span>setModel(model);
      pieChart<span class="operator">-</span><span class="operator">&gt;</span>setModel(model);

      <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span> <span class="operator">*</span>selectionModel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span>(model);
      table<span class="operator">-</span><span class="operator">&gt;</span>setSelectionModel(selectionModel);
      pieChart<span class="operator">-</span><span class="operator">&gt;</span>setSelectionModel(selectionModel);

      <span class="type"><a href="qheaderview.html">QHeaderView</a></span> <span class="operator">*</span>headerView <span class="operator">=</span> table<span class="operator">-</span><span class="operator">&gt;</span>horizontalHeader();
      headerView<span class="operator">-</span><span class="operator">&gt;</span>setStretchLastSection(<span class="keyword">true</span>);

      setCentralWidget(splitter);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>openFile()
  {
      <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="operator">,</span> tr(<span class="string">&quot;Choose a data file&quot;</span>)<span class="operator">,</span> <span class="string">&quot;&quot;</span><span class="operator">,</span> <span class="string">&quot;*.cht&quot;</span>);
      <span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
          loadFile(fileName);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>loadFile(<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="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text))
          <span class="keyword">return</span>;

      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> stream(<span class="operator">&amp;</span>file);
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> line;

      model<span class="operator">-</span><span class="operator">&gt;</span>removeRows(<span class="number">0</span><span class="operator">,</span> model<span class="operator">-</span><span class="operator">&gt;</span>rowCount(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>());

      <span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">do</span> {
          line <span class="operator">=</span> stream<span class="operator">.</span>readLine();
          <span class="keyword">if</span> (<span class="operator">!</span>line<span class="operator">.</span>isEmpty()) {
              model<span class="operator">-</span><span class="operator">&gt;</span>insertRows(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>());

              <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> pieces <span class="operator">=</span> line<span class="operator">.</span>split(<span class="char">','</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>SkipEmptyParts);
              model<span class="operator">-</span><span class="operator">&gt;</span>setData(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                             pieces<span class="operator">.</span>value(<span class="number">0</span>));
              model<span class="operator">-</span><span class="operator">&gt;</span>setData(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                             pieces<span class="operator">.</span>value(<span class="number">1</span>));
              model<span class="operator">-</span><span class="operator">&gt;</span>setData(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                             <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(pieces<span class="operator">.</span>value(<span class="number">2</span>))<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DecorationRole);
              row<span class="operator">+</span><span class="operator">+</span>;
          }
      } <span class="keyword">while</span> (<span class="operator">!</span>line<span class="operator">.</span>isEmpty());

      file<span class="operator">.</span>close();
      statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;Loaded %1&quot;</span>)<span class="operator">.</span>arg(fileName)<span class="operator">,</span> <span class="number">2000</span>);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>saveFile()
  {
      <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">&quot;Save file as&quot;</span>)<span class="operator">,</span> <span class="string">&quot;&quot;</span><span class="operator">,</span> <span class="string">&quot;*.cht&quot;</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>WriteOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text))
          <span class="keyword">return</span>;

      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> stream(<span class="operator">&amp;</span>file);
      <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator">&lt;</span> model<span class="operator">-</span><span class="operator">&gt;</span>rowCount(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()); <span class="operator">+</span><span class="operator">+</span>row) {

          <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> pieces;

          pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">&gt;</span>data(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                                    <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DisplayRole)<span class="operator">.</span>toString());
          pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">&gt;</span>data(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                                    <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DisplayRole)<span class="operator">.</span>toString());
          pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">&gt;</span>data(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                                    <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DecorationRole)<span class="operator">.</span>toString());

          stream <span class="operator">&lt;</span><span class="operator">&lt;</span> pieces<span class="operator">.</span>join(<span class="char">','</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\n&quot;</span>;
      }

      file<span class="operator">.</span>close();
      statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;Saved %1&quot;</span>)<span class="operator">.</span>arg(fileName)<span class="operator">,</span> <span class="number">2000</span>);
  }

</pre>
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<!-- @@@itemviews/chart/mainwindow.cpp -->
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