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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">filetree/mainwindow.cpp</span>
<!-- $$$filetree/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 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.
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  <span class="preprocessor">#include &lt;QFileDialog&gt;</span>
  <span class="preprocessor">#include &lt;QMessageBox&gt;</span>
  <span class="preprocessor">#include &lt;QLibraryInfo&gt;</span>
  <span class="preprocessor">#include &lt;QtXmlPatterns&gt;</span>

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

  MainWindow<span class="operator">::</span>MainWindow() : m_fileTree(m_namePool)
  {
      setupUi(<span class="keyword">this</span>);

      <span class="keyword">new</span> XmlSyntaxHighlighter(fileTree<span class="operator">-</span><span class="operator">&gt;</span>document());

      <span class="comment">// Set up the font.</span>
      {
          <span class="type">QFont</span> font(<span class="string">&quot;Courier&quot;</span><span class="operator">,</span><span class="number">10</span>);
          font<span class="operator">.</span>setFixedPitch(<span class="keyword">true</span>);

          fileTree<span class="operator">-</span><span class="operator">&gt;</span>setFont(font);
          queryEdit<span class="operator">-</span><span class="operator">&gt;</span>setFont(font);
          output<span class="operator">-</span><span class="operator">&gt;</span>setFont(font);
      }

      <span class="keyword">const</span> <span class="type">QString</span> dir(<span class="type">QLibraryInfo</span><span class="operator">::</span>location(<span class="type">QLibraryInfo</span><span class="operator">::</span>ExamplesPath) <span class="operator">+</span> <span class="string">&quot;/xmlpatterns/filetree&quot;</span>);
      qDebug() <span class="operator">&lt;</span><span class="operator">&lt;</span> dir;

      <span class="keyword">if</span> (<span class="type">QDir</span>(dir)<span class="operator">.</span>exists())
          loadDirectory(dir);
      <span class="keyword">else</span>
          fileTree<span class="operator">-</span><span class="operator">&gt;</span>setPlainText(tr(<span class="string">&quot;Use the Open menu entry to select a directory.&quot;</span>));

      <span class="keyword">const</span> <span class="type">QStringList</span> queries(<span class="type">QDir</span>(<span class="string">&quot;:/queries/&quot;</span><span class="operator">,</span> <span class="string">&quot;*.xq&quot;</span>)<span class="operator">.</span>entryList());
      <span class="type">int</span> len <span class="operator">=</span> queries<span class="operator">.</span>count();

      <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> len; <span class="operator">+</span><span class="operator">+</span>i)
          queryBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(queries<span class="operator">.</span>at(i));

  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>on_queryBox_currentIndexChanged(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>currentText)
  {
      <span class="type">QFile</span> queryFile(<span class="string">&quot;:/queries/&quot;</span> <span class="operator">+</span> currentText);
      queryFile<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly);

      queryEdit<span class="operator">-</span><span class="operator">&gt;</span>setPlainText(<span class="type">QString</span><span class="operator">::</span>fromLatin1(queryFile<span class="operator">.</span>readAll()));
      evaluateResult();
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>evaluateResult()
  {
      <span class="keyword">if</span> (queryBox<span class="operator">-</span><span class="operator">&gt;</span>currentText()<span class="operator">.</span>isEmpty() <span class="operator">|</span><span class="operator">|</span> m_fileNode<span class="operator">.</span>isNull())
          <span class="keyword">return</span>;

      <span class="type"><a href="qxmlquery.html">QXmlQuery</a></span> query(m_namePool);
      query<span class="operator">.</span>bindVariable(<span class="string">&quot;fileTree&quot;</span><span class="operator">,</span> m_fileNode);
      query<span class="operator">.</span>setQuery(<span class="type">QUrl</span>(<span class="string">&quot;qrc:/queries/&quot;</span> <span class="operator">+</span> queryBox<span class="operator">-</span><span class="operator">&gt;</span>currentText()));

      <span class="type">QByteArray</span> formatterOutput;
      <span class="type">QBuffer</span> buffer(<span class="operator">&amp;</span>formatterOutput);
      buffer<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>WriteOnly);

      <span class="type"><a href="qxmlformatter.html">QXmlFormatter</a></span> formatter(query<span class="operator">,</span> <span class="operator">&amp;</span>buffer);
      query<span class="operator">.</span>evaluateTo(<span class="operator">&amp;</span>formatter);

      output<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="type">QString</span><span class="operator">::</span>fromLatin1(formatterOutput<span class="operator">.</span>constData()));
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionOpenDirectory_triggered()
  {
      <span class="keyword">const</span> <span class="type">QString</span> directoryName <span class="operator">=</span> <span class="type">QFileDialog</span><span class="operator">::</span>getExistingDirectory(<span class="keyword">this</span>);
      <span class="keyword">if</span> (<span class="operator">!</span>directoryName<span class="operator">.</span>isEmpty())
          loadDirectory(directoryName);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>loadDirectory(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>directory)
  {
      Q_ASSERT(<span class="type">QDir</span>(directory)<span class="operator">.</span>exists());

      m_fileNode <span class="operator">=</span> m_fileTree<span class="operator">.</span>nodeFor(directory);

      <span class="type"><a href="qxmlquery.html">QXmlQuery</a></span> query(m_namePool);
      query<span class="operator">.</span>bindVariable(<span class="string">&quot;fileTree&quot;</span><span class="operator">,</span> m_fileNode);
      query<span class="operator">.</span>setQuery(<span class="type">QUrl</span>(<span class="string">&quot;qrc:/queries/wholeTree.xq&quot;</span>));

      <span class="type">QByteArray</span> output;
      <span class="type">QBuffer</span> buffer(<span class="operator">&amp;</span>output);
      buffer<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>WriteOnly);

      <span class="type"><a href="qxmlformatter.html">QXmlFormatter</a></span> formatter(query<span class="operator">,</span> <span class="operator">&amp;</span>buffer);
      query<span class="operator">.</span>evaluateTo(<span class="operator">&amp;</span>formatter);

      treeInfo<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Model of %1 output as XML.&quot;</span>)<span class="operator">.</span>arg(directory));
      fileTree<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="type">QString</span><span class="operator">::</span>fromLatin1(output<span class="operator">.</span>constData()));
      evaluateResult();
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>on_actionAbout_triggered()
  {
      <span class="type">QMessageBox</span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;About File Tree&quot;</span>)<span class="operator">,</span>
                     tr(<span class="string">&quot;&lt;p&gt;Select &lt;b&gt;File-&gt;Open Directory&lt;/b&gt; and &quot;</span>
                        <span class="string">&quot;choose a directory. The directory is then &quot;</span>
                        <span class="string">&quot;loaded into the model, and the model is &quot;</span>
                        <span class="string">&quot;displayed on the left as XML.&lt;/p&gt;&quot;</span>

                        <span class="string">&quot;&lt;p&gt;From the query menu on the right, select &quot;</span>
                        <span class="string">&quot;a query. The query is displayed and then run &quot;</span>
                        <span class="string">&quot;on the model. The results are displayed below &quot;</span>
                        <span class="string">&quot;the query.&lt;/p&gt;&quot;</span>));
  }

</pre>
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<!-- @@@filetree/mainwindow.cpp -->
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