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# mainwindow.cpp Example File
xmlpatterns/filetree/mainwindow.cpp

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     #include <QtGui>
     #include <QLibraryInfo>
     #include <QtXmlPatterns>

     #include "mainwindow.h"

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

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

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

         /* We load one which isn't too big. */
         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()
     {
         loadDirectory(QFileDialog::getExistingDirectory(this));
     }

     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((QString(tr("%1 rendered 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>The <b>File Tree</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 sub-class makes it possible to "
                                     "use the XQuery language's strength of selecting and aggregating on top of "
                                     "the file system.</p>"));
     }