mainwindow.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** 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 Nokia Corporation and its Subsidiary(-ies) 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 <QtGui>
 #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."));
 }