mainwindow.cpp Example File

schema/mainwindow.cpp
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
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** This file is part of the examples of the Qt Toolkit.
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#include <QtGui>
#include <QtXmlPatterns>

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

class MessageHandler : public QAbstractMessageHandler
{
public:
    MessageHandler()
        : QAbstractMessageHandler(0)
    {
    }

    QString statusMessage() const
    {
        return m_description;
    }

    int line() const
    {
        return m_sourceLocation.line();
    }

    int column() const
    {
        return m_sourceLocation.column();
    }

protected:
    virtual void handleMessage(QtMsgType type, const QString &description,
                               const QUrl &identifier, const QSourceLocation &sourceLocation)
    {
        Q_UNUSED(type);
        Q_UNUSED(identifier);

        m_messageType = type;
        m_description = description;
        m_sourceLocation = sourceLocation;
    }

private:
    QtMsgType m_messageType;
    QString m_description;
    QSourceLocation m_sourceLocation;
};

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

    new XmlSyntaxHighlighter(schemaView->document());
    new XmlSyntaxHighlighter(instanceEdit->document());

    schemaSelection->addItem(tr("Contact Schema"));
    schemaSelection->addItem(tr("Recipe Schema"));
    schemaSelection->addItem(tr("Order Schema"));

    instanceSelection->addItem(tr("Valid Contact Instance"));
    instanceSelection->addItem(tr("Invalid Contact Instance"));

    connect(schemaSelection, SIGNAL(currentIndexChanged(int)), SLOT(schemaSelected(int)));
    connect(instanceSelection, SIGNAL(currentIndexChanged(int)), SLOT(instanceSelected(int)));
    connect(validateButton, SIGNAL(clicked()), SLOT(validate()));
    connect(instanceEdit, SIGNAL(textChanged()), SLOT(textChanged()));

    validationStatus->setAlignment(Qt::AlignCenter | Qt::AlignVCenter);

    schemaSelected(0);
    instanceSelected(0);
}

void MainWindow::schemaSelected(int index)
{
    instanceSelection->clear();
    if (index == 0) {
        instanceSelection->addItem(tr("Valid Contact Instance"));
        instanceSelection->addItem(tr("Invalid Contact Instance"));
    } else if (index == 1) {
        instanceSelection->addItem(tr("Valid Recipe Instance"));
        instanceSelection->addItem(tr("Invalid Recipe Instance"));
    } else if (index == 2) {
        instanceSelection->addItem(tr("Valid Order Instance"));
        instanceSelection->addItem(tr("Invalid Order Instance"));
    }
    textChanged();

    const QString fileName = QStringLiteral(":/schema_")
        + QString::number(index) + QStringLiteral(".xsd");
    QFile schemaFile(fileName);
    if (!schemaFile.open(QIODevice::ReadOnly)) {
        qWarning() << "Cannot open" << QDir::toNativeSeparators(fileName)
            << ':' << schemaFile.errorString();
        return;
    }

    const QString schemaText(QString::fromUtf8(schemaFile.readAll()));
    schemaView->setPlainText(schemaText);

    validate();
}

void MainWindow::instanceSelected(int index)
{
    if (index < 0) {
        instanceEdit->setPlainText(QString());
        return;
    }
    const QString fileName = QStringLiteral(":/instance_")
        + QString::number(2 * schemaSelection->currentIndex() + index)
        + QStringLiteral(".xml");
    QFile instanceFile(fileName);
    if (!instanceFile.open(QIODevice::ReadOnly)) {
        qWarning() << "Cannot open" << QDir::toNativeSeparators(fileName)
            << ':' << instanceFile.errorString();
        return;
    }
    const QString instanceText(QString::fromUtf8(instanceFile.readAll()));
    instanceEdit->setPlainText(instanceText);

    validate();
}

void MainWindow::validate()
{
    const QByteArray schemaData = schemaView->toPlainText().toUtf8();
    const QByteArray instanceData = instanceEdit->toPlainText().toUtf8();

    MessageHandler messageHandler;

    QXmlSchema schema;
    schema.setMessageHandler(&messageHandler);

    schema.load(schemaData);

    bool errorOccurred = false;
    if (!schema.isValid()) {
        errorOccurred = true;
    } else {
        QXmlSchemaValidator validator(schema);
        if (!validator.validate(instanceData))
            errorOccurred = true;
    }

    if (errorOccurred) {
        validationStatus->setText(messageHandler.statusMessage());
        moveCursor(messageHandler.line(), messageHandler.column());
    } else {
        validationStatus->setText(tr("validation successful"));
    }

    const QString styleSheet = QString("QLabel {background: %1; padding: 3px}")
                                      .arg(errorOccurred ? QColor(Qt::red).lighter(160).name() :
                                                           QColor(Qt::green).lighter(160).name());
    validationStatus->setStyleSheet(styleSheet);
}

void MainWindow::textChanged()
{
    instanceEdit->setExtraSelections(QList<QTextEdit::ExtraSelection>());
}

void MainWindow::moveCursor(int line, int column)
{
    instanceEdit->moveCursor(QTextCursor::Start);
    for (int i = 1; i < line; ++i)
        instanceEdit->moveCursor(QTextCursor::Down);

    for (int i = 1; i < column; ++i)
        instanceEdit->moveCursor(QTextCursor::Right);

    QList<QTextEdit::ExtraSelection> extraSelections;
    QTextEdit::ExtraSelection selection;

    const QColor lineColor = QColor(Qt::red).lighter(160);
    selection.format.setBackground(lineColor);
    selection.format.setProperty(QTextFormat::FullWidthSelection, true);
    selection.cursor = instanceEdit->textCursor();
    selection.cursor.clearSelection();
    extraSelections.append(selection);

    instanceEdit->setExtraSelections(extraSelections);

    instanceEdit->setFocus();
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.