mainwindow.cpp Example File | Qt WebKit Examples 5.9

Qt 5.9 | Qt WebKit Examples | QObject XML Model Example | mainwindow.cpp Example File

Qt 5.9.2 Reference Documentation

# mainwindow.cpp Example File

webkitwidgets/xmlpatterns/qobjectxmlmodel/mainwindow.cpp

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      #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."));
      }