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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">schema/mainwindow.cpp</span>
<!-- $$$schema/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.
  **   * 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 &lt;QtXmlPatterns&gt;</span>

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

  <span class="keyword">class</span> MessageHandler : <span class="keyword">public</span> <span class="type"><a href="qabstractmessagehandler.html">QAbstractMessageHandler</a></span>
  {
  <span class="keyword">public</span>:
      MessageHandler()
          : <span class="type"><a href="qabstractmessagehandler.html">QAbstractMessageHandler</a></span>(<span class="number">0</span>)
      {
      }

      <span class="type">QString</span> statusMessage() <span class="keyword">const</span>
      {
          <span class="keyword">return</span> m_description;
      }

      <span class="type">int</span> line() <span class="keyword">const</span>
      {
          <span class="keyword">return</span> m_sourceLocation<span class="operator">.</span>line();
      }

      <span class="type">int</span> column() <span class="keyword">const</span>
      {
          <span class="keyword">return</span> m_sourceLocation<span class="operator">.</span>column();
      }

  <span class="keyword">protected</span>:
      <span class="keyword">virtual</span> <span class="type">void</span> handleMessage(<span class="type">QtMsgType</span> type<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>description<span class="operator">,</span>
                                 <span class="keyword">const</span> <span class="type">QUrl</span> <span class="operator">&amp;</span>identifier<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qsourcelocation.html">QSourceLocation</a></span> <span class="operator">&amp;</span>sourceLocation)
      {
          Q_UNUSED(type);
          Q_UNUSED(identifier);

          m_description <span class="operator">=</span> description;
          m_sourceLocation <span class="operator">=</span> sourceLocation;
      }

  <span class="keyword">private</span>:
      <span class="type">QString</span> m_description;
      <span class="type"><a href="qsourcelocation.html">QSourceLocation</a></span> m_sourceLocation;
  };

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

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

      schemaSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Contact Schema&quot;</span>));
      schemaSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Recipe Schema&quot;</span>));
      schemaSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Order Schema&quot;</span>));

      instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Valid Contact Instance&quot;</span>));
      instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Invalid Contact Instance&quot;</span>));

      connect(schemaSelection<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span> SLOT(schemaSelected(<span class="type">int</span>)));
      connect(instanceSelection<span class="operator">,</span> SIGNAL(currentIndexChanged(<span class="type">int</span>))<span class="operator">,</span> SLOT(instanceSelected(<span class="type">int</span>)));
      connect(validateButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> SLOT(validate()));
      connect(instanceEdit<span class="operator">,</span> SIGNAL(textChanged())<span class="operator">,</span> SLOT(textChanged()));

      validationStatus<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type">Qt</span><span class="operator">::</span>AlignCenter <span class="operator">|</span> <span class="type">Qt</span><span class="operator">::</span>AlignVCenter);

      schemaSelected(<span class="number">0</span>);
      instanceSelected(<span class="number">0</span>);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>schemaSelected(<span class="type">int</span> index)
  {
      instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>clear();
      <span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
          instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Valid Contact Instance&quot;</span>));
          instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Invalid Contact Instance&quot;</span>));
      } <span class="keyword">else</span> <span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>) {
          instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Valid Recipe Instance&quot;</span>));
          instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Invalid Recipe Instance&quot;</span>));
      } <span class="keyword">else</span> <span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="number">2</span>) {
          instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Valid Order Instance&quot;</span>));
          instanceSelection<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Invalid Order Instance&quot;</span>));
      }
      textChanged();

      <span class="keyword">const</span> <span class="type">QString</span> fileName <span class="operator">=</span> <span class="type">QStringLiteral</span>(<span class="string">&quot;:/schema_&quot;</span>)
          <span class="operator">+</span> <span class="type">QString</span><span class="operator">::</span>number(index) <span class="operator">+</span> <span class="type">QStringLiteral</span>(<span class="string">&quot;.xsd&quot;</span>);
      <span class="type">QFile</span> schemaFile(fileName);
      <span class="keyword">if</span> (<span class="operator">!</span>schemaFile<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly)) {
          qWarning() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Cannot open&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type">QDir</span><span class="operator">::</span>toNativeSeparators(fileName)
              <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="char">':'</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> schemaFile<span class="operator">.</span>errorString();
          <span class="keyword">return</span>;
      }

      <span class="keyword">const</span> <span class="type">QString</span> schemaText(<span class="type">QString</span><span class="operator">::</span>fromUtf8(schemaFile<span class="operator">.</span>readAll()));
      schemaView<span class="operator">-</span><span class="operator">&gt;</span>setPlainText(schemaText);

      validate();
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>instanceSelected(<span class="type">int</span> index)
  {
      <span class="keyword">if</span> (index <span class="operator">&lt;</span> <span class="number">0</span>) {
          instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>setPlainText(<span class="type">QString</span>());
          <span class="keyword">return</span>;
      }
      <span class="keyword">const</span> <span class="type">QString</span> fileName <span class="operator">=</span> <span class="type">QStringLiteral</span>(<span class="string">&quot;:/instance_&quot;</span>)
          <span class="operator">+</span> <span class="type">QString</span><span class="operator">::</span>number(<span class="number">2</span> <span class="operator">*</span> schemaSelection<span class="operator">-</span><span class="operator">&gt;</span>currentIndex() <span class="operator">+</span> index)
          <span class="operator">+</span> <span class="type">QStringLiteral</span>(<span class="string">&quot;.xml&quot;</span>);
      <span class="type">QFile</span> instanceFile(fileName);
      <span class="keyword">if</span> (<span class="operator">!</span>instanceFile<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly)) {
          qWarning() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Cannot open&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type">QDir</span><span class="operator">::</span>toNativeSeparators(fileName)
              <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="char">':'</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> instanceFile<span class="operator">.</span>errorString();
          <span class="keyword">return</span>;
      }
      <span class="keyword">const</span> <span class="type">QString</span> instanceText(<span class="type">QString</span><span class="operator">::</span>fromUtf8(instanceFile<span class="operator">.</span>readAll()));
      instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>setPlainText(instanceText);

      validate();
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>validate()
  {
      <span class="keyword">const</span> <span class="type">QByteArray</span> schemaData <span class="operator">=</span> schemaView<span class="operator">-</span><span class="operator">&gt;</span>toPlainText()<span class="operator">.</span>toUtf8();
      <span class="keyword">const</span> <span class="type">QByteArray</span> instanceData <span class="operator">=</span> instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>toPlainText()<span class="operator">.</span>toUtf8();

      MessageHandler messageHandler;

      <span class="type"><a href="qxmlschema.html">QXmlSchema</a></span> schema;
      schema<span class="operator">.</span>setMessageHandler(<span class="operator">&amp;</span>messageHandler);

      schema<span class="operator">.</span>load(schemaData);

      bool errorOccurred <span class="operator">=</span> <span class="keyword">false</span>;
      <span class="keyword">if</span> (<span class="operator">!</span>schema<span class="operator">.</span>isValid()) {
          errorOccurred <span class="operator">=</span> <span class="keyword">true</span>;
      } <span class="keyword">else</span> {
          <span class="type"><a href="qxmlschemavalidator.html">QXmlSchemaValidator</a></span> validator(schema);
          <span class="keyword">if</span> (<span class="operator">!</span>validator<span class="operator">.</span>validate(instanceData))
              errorOccurred <span class="operator">=</span> <span class="keyword">true</span>;
      }

      <span class="keyword">if</span> (errorOccurred) {
          validationStatus<span class="operator">-</span><span class="operator">&gt;</span>setText(messageHandler<span class="operator">.</span>statusMessage());
          moveCursor(messageHandler<span class="operator">.</span>line()<span class="operator">,</span> messageHandler<span class="operator">.</span>column());
      } <span class="keyword">else</span> {
          validationStatus<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;validation successful&quot;</span>));
      }

      <span class="keyword">const</span> <span class="type">QString</span> styleSheet <span class="operator">=</span> <span class="type">QString</span>(<span class="string">&quot;QLabel {background: %1; padding: 3px}&quot;</span>)
                                        <span class="operator">.</span>arg(errorOccurred <span class="operator">?</span> <span class="type">QColor</span>(<span class="type">Qt</span><span class="operator">::</span>red)<span class="operator">.</span>lighter(<span class="number">160</span>)<span class="operator">.</span>name() :
                                                             <span class="type">QColor</span>(<span class="type">Qt</span><span class="operator">::</span>green)<span class="operator">.</span>lighter(<span class="number">160</span>)<span class="operator">.</span>name());
      validationStatus<span class="operator">-</span><span class="operator">&gt;</span>setStyleSheet(styleSheet);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>textChanged()
  {
      instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>setExtraSelections(<span class="type">QList</span><span class="operator">&lt;</span><span class="type">QTextEdit</span><span class="operator">::</span>ExtraSelection<span class="operator">&gt;</span>());
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>moveCursor(<span class="type">int</span> line<span class="operator">,</span> <span class="type">int</span> column)
  {
      instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>moveCursor(<span class="type">QTextCursor</span><span class="operator">::</span>Start);
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator">&lt;</span> line; <span class="operator">+</span><span class="operator">+</span>i)
          instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>moveCursor(<span class="type">QTextCursor</span><span class="operator">::</span>Down);

      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator">&lt;</span> column; <span class="operator">+</span><span class="operator">+</span>i)
          instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>moveCursor(<span class="type">QTextCursor</span><span class="operator">::</span>Right);

      <span class="type">QList</span><span class="operator">&lt;</span><span class="type">QTextEdit</span><span class="operator">::</span>ExtraSelection<span class="operator">&gt;</span> extraSelections;
      <span class="type">QTextEdit</span><span class="operator">::</span>ExtraSelection selection;

      <span class="keyword">const</span> <span class="type">QColor</span> lineColor <span class="operator">=</span> <span class="type">QColor</span>(<span class="type">Qt</span><span class="operator">::</span>red)<span class="operator">.</span>lighter(<span class="number">160</span>);
      selection<span class="operator">.</span>format<span class="operator">.</span>setBackground(lineColor);
      selection<span class="operator">.</span>format<span class="operator">.</span>setProperty(<span class="type">QTextFormat</span><span class="operator">::</span>FullWidthSelection<span class="operator">,</span> <span class="keyword">true</span>);
      selection<span class="operator">.</span>cursor <span class="operator">=</span> instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>textCursor();
      selection<span class="operator">.</span>cursor<span class="operator">.</span>clearSelection();
      extraSelections<span class="operator">.</span>append(selection);

      instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>setExtraSelections(extraSelections);

      instanceEdit<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
  }

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