mainwindow.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** You may use this file under the terms of the BSD license as follows:
  **
  ** "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
  ** "AS IS" 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."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #include <QtWidgets>
  #include <QtXmlPatterns>

  #include "mainwindow.h"
  #include "qobjectxmlmodel.h"
  #include "xmlsyntaxhighlighter.h"

  MainWindow::MainWindow()
  {
      setupUi(this);

      new XmlSyntaxHighlighter(wholeTreeOutput->document());

      /* Setup the font. */
      {
          QFont font("Courier");
          font.setFixedPitch(true);

          wholeTree->setFont(font);
          wholeTreeOutput->setFont(font);
          htmlQueryEdit->setFont(font);
      }

      QXmlNamePool namePool;
      QObjectXmlModel qObjectModel(this, namePool);
      QXmlQuery query(namePool);

      /* The QObject tree as XML view. */
      {
          query.bindVariable("root", qObjectModel.root());
          query.setQuery(QUrl("qrc:/queries/wholeTree.xq"));

          Q_ASSERT(query.isValid());
          QByteArray output;
          QBuffer buffer(&output);
          buffer.open(QIODevice::WriteOnly);

          /* Let's the use the formatter, so it's a bit easier to read. */
          QXmlFormatter serializer(query, &buffer);

          query.evaluateTo(&serializer);
          buffer.close();

          {
              QFile queryFile(":/queries/wholeTree.xq");
              queryFile.open(QIODevice::ReadOnly);
              wholeTree->setPlainText(QString::fromUtf8(queryFile.readAll()));
              wholeTreeOutput->setPlainText(QString::fromUtf8(output.constData()));
          }
      }

      /* The QObject occurrence statistics as HTML view. */
      {
          query.setQuery(QUrl("qrc:/queries/statisticsInHTML.xq"));
          Q_ASSERT(query.isValid());

          QByteArray output;
          QBuffer buffer(&output);
          buffer.open(QIODevice::WriteOnly);

          /* Let's the use the serializer, so we gain a bit of speed. */
          QXmlSerializer serializer(query, &buffer);

          query.evaluateTo(&serializer);
          buffer.close();

          {
              QFile queryFile(":/queries/statisticsInHTML.xq");
              queryFile.open(QIODevice::ReadOnly);
              htmlQueryEdit->setPlainText(QString::fromUtf8(queryFile.readAll()));
              htmlOutput->setHtml(QString(output));
          }
      }
  }

  void MainWindow::on_actionAbout_triggered()
  {
      QMessageBox::about(this,
                         tr("About QObject XML Model"),
                         tr("<p>The <b>QObject XML Model</b> example shows "
                            "how to use XQuery on top of data of your choice "
                            "without converting it to an XML document.</p>"
                            "<p>In this example a QSimpleXmlNodeModel subclass "
                            "makes it possible to query a QObject tree using "
                            "XQuery and retrieve the result as pointers to "
                            "QObjects, or as XML.</p>"
                            "<p>A possible use case of this could be to write "
                            "an application that tests a graphical interface "
                            "against Human Interface Guidelines, or that "
                            "queries an application's data which is modeled "
                            "using a QObject tree and dynamic properties."));
  }