mainwindow.cpp Example File

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  #include <QFileDialog>
  #include <QMessageBox>
  #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(const QString &currentText)
  {
      QFile queryFile(":/queries/" + currentText);
      queryFile.open(QIODevice::ReadOnly);

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

  void MainWindow::evaluateResult()
  {
      if (queryBox->currentText().isEmpty() || m_fileNode.isNull())
          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>"));
  }