mainwindow.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 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 <QLibraryInfo>
 #include <QtXmlPatterns>

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

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

     new XmlSyntaxHighlighter(fileTree->document());

     // Set up the font.
     {
         QFont font("Courier",10);
         font.setFixedPitch(true);

         fileTree->setFont(font);
         queryEdit->setFont(font);
         output->setFont(font);
     }

     const QString dir(QLibraryInfo::location(QLibraryInfo::ExamplesPath) + "/xmlpatterns/filetree");
     qDebug() << dir;

     if (QDir(dir).exists())
         loadDirectory(dir);
     else
         fileTree->setPlainText(tr("Use the Open menu entry to select a directory."));

     const QStringList queries(QDir(":/queries/", "*.xq").entryList());
     int len = queries.count();

     for (int i = 0; i < len; ++i)
         queryBox->addItem(queries.at(i));

 }

 void MainWindow::on_queryBox_currentIndexChanged()
 {
     QFile queryFile(":/queries/" + queryBox->currentText());
     queryFile.open(QIODevice::ReadOnly);

     queryEdit->setPlainText(QString::fromLatin1(queryFile.readAll()));
     evaluateResult();
 }

 void MainWindow::evaluateResult()
 {
     if (queryBox->currentText().isEmpty())
         return;

     QXmlQuery query(m_namePool);
     query.bindVariable("fileTree", m_fileNode);
     query.setQuery(QUrl("qrc:/queries/" + queryBox->currentText()));

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

     QXmlFormatter formatter(query, &buffer);
     query.evaluateTo(&formatter);

     output->setText(QString::fromLatin1(formatterOutput.constData()));
 }

 void MainWindow::on_actionOpenDirectory_triggered()
 {
     const QString directoryName = QFileDialog::getExistingDirectory(this);
     if (!directoryName.isEmpty())
         loadDirectory(directoryName);
 }

 void MainWindow::loadDirectory(const QString &directory)
 {
     Q_ASSERT(QDir(directory).exists());

     m_fileNode = m_fileTree.nodeFor(directory);

     QXmlQuery query(m_namePool);
     query.bindVariable("fileTree", m_fileNode);
     query.setQuery(QUrl("qrc:/queries/wholeTree.xq"));

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

     QXmlFormatter formatter(query, &buffer);
     query.evaluateTo(&formatter);

     treeInfo->setText(tr("Model of %1 output as XML.").arg(directory));
     fileTree->setText(QString::fromLatin1(output.constData()));
     evaluateResult();
 }

 void MainWindow::on_actionAbout_triggered()
 {
     QMessageBox::about(this, tr("About File Tree"),
                    tr("<p>Select <b>File->Open Directory</b> and "
                       "choose a directory. The directory is then "
                       "loaded into the model, and the model is "
                       "displayed on the left as XML.</p>"

                       "<p>From the query menu on the right, select "
                       "a query. The query is displayed and then run "
                       "on the model. The results are displayed below "
                       "the query.</p>"));
 }