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</tr></table><h1 class="title">mainwindow.cpp Example File<br /><span class="small-subtitle">xmlpatterns/schema/mainwindow.cpp</span>

</h1>

<pre><span class="comment"> /****************************************************************************

** Contact: Nokia Corporation (qt-info@nokia.com)

** This file is part of the examples of the Qt Toolkit.

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file. Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

** In addition, as a special exception, Nokia gives you certain additional

** rights. These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

** $QT_END_LICENSE$

****************************************************************************/</span>

#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;

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QString m_description;

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QSourceLocation m_sourceLocation;

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};

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MainWindow::MainWindow()

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{

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setupUi(this);

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new XmlSyntaxHighlighter(schemaView->document());

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new XmlSyntaxHighlighter(instanceEdit->document());

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

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

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

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

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

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connect(schemaSelection, SIGNAL(currentIndexChanged(int)), SLOT(schemaSelected(int)));

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connect(instanceSelection, SIGNAL(currentIndexChanged(int)), SLOT(instanceSelected(int)));

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connect(validateButton, SIGNAL(clicked()), SLOT(validate()));

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connect(instanceEdit, SIGNAL(textChanged()), SLOT(textChanged()));

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

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schemaSelected(0);

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instanceSelected(0);

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}

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void MainWindow::schemaSelected(int index)

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{

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instanceSelection->clear();

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if (index == 0) {

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

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

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} else if (index == 1) {

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instanceSelection->addItem(tr("Valid Recipe Instance"));

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instanceSelection->addItem(tr("Invalid Recipe Instance"));

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} else if (index == 2) {

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instanceSelection->addItem(tr("Valid Order Instance"));

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instanceSelection->addItem(tr("Invalid Order Instance"));

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}

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textChanged();

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QFile schemaFile(QString(":/schema_%1.xsd").arg(index));

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schemaFile.open(QIODevice::ReadOnly);

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const QString schemaText(QString::fromUtf8(schemaFile.readAll()));

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schemaView->setPlainText(schemaText);

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validate();

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}

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void MainWindow::instanceSelected(int index)

153

{

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QFile instanceFile(QString(":/instance_%1.xml").arg((2*schemaSelection->currentIndex()) + index));

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instanceFile.open(QIODevice::ReadOnly);

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const QString instanceText(QString::fromUtf8(instanceFile.readAll()));

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instanceEdit->setPlainText(instanceText);

158

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validate();

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}

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void MainWindow::validate()

163

{

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const QByteArray schemaData = schemaView->toPlainText().toUtf8();

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const QByteArray instanceData = instanceEdit->toPlainText().toUtf8();

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MessageHandler messageHandler;

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QXmlSchema schema;

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schema.setMessageHandler(&messageHandler);

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schema.load(schemaData);

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bool errorOccurred = false;

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if (!schema.isValid()) {

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errorOccurred = true;

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} else {

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QXmlSchemaValidator validator(schema);

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if (!validator.validate(instanceData))

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errorOccurred = true;

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}

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if (errorOccurred) {

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validationStatus->setText(messageHandler.statusMessage());

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moveCursor(messageHandler.line(), messageHandler.column());

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} else {

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validationStatus->setText(tr("validation successful"));

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}

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const QString styleSheet = QString("QLabel {background: %1; padding: 3px}")

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.arg(errorOccurred ? QColor(Qt::red).lighter(160).name() :

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QColor(Qt::green).lighter(160).name());

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validationStatus->setStyleSheet(styleSheet);

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}

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void MainWindow::textChanged()

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{

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instanceEdit->setExtraSelections(QList<QTextEdit::ExtraSelection>());

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}

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void MainWindow::moveCursor(int line, int column)

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{

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instanceEdit->moveCursor(QTextCursor::Start);

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for (int i = 1; i < line; ++i)

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instanceEdit->moveCursor(QTextCursor::Down);

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for (int i = 1; i < column; ++i)

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instanceEdit->moveCursor(QTextCursor::Right);

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QList<QTextEdit::ExtraSelection> extraSelections;

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QTextEdit::ExtraSelection selection;

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const QColor lineColor = QColor(Qt::red).lighter(160);

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selection.format.setBackground(lineColor);

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selection.format.setProperty(QTextFormat::FullWidthSelection, true);

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selection.cursor = instanceEdit->textCursor();

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selection.cursor.clearSelection();

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extraSelections.append(selection);

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instanceEdit->setExtraSelections(extraSelections);

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instanceEdit->setFocus();

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}</pre>

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