mainwindow.cpp Example File | Qt WebKit Examples 5.4

- Qt 5.4
- Qt WebKit Examples
- QObject XML Model Example
- mainwindow.cpp Example File
- Qt 5.4.2 Reference Documentation

# mainwindow.cpp Example File

webkitwidgets/xmlpatterns/qobjectxmlmodel/mainwindow.cpp

    /****************************************************************************
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    ** This file is part of the examples of the Qt Toolkit.
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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."));
    }