examples/xmlpatterns/schema/mainwindow.cpp

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  40
  41 #include <QtGui>
  42 #include <QtXmlPatterns>
  43
  44 #include "mainwindow.h"
  45 #include "xmlsyntaxhighlighter.h"
  46
  47 //! [4]
  48 class MessageHandler : public QAbstractMessageHandler
  49 {
  50     public:
  51         MessageHandler()
  52             : QAbstractMessageHandler(0)
  53         {
  54         }
  55
  56         QString statusMessage() const
  57         {
  58             return m_description;
  59         }
  60
  61         int line() const
  62         {
  63             return m_sourceLocation.line();
  64         }
  65
  66         int column() const
  67         {
  68             return m_sourceLocation.column();
  69         }
  70
  71     protected:
  72         virtual void handleMessage(QtMsgType type, const QString &description,
  73                                    const QUrl &identifier, const QSourceLocation &sourceLocation)
  74         {
  75             Q_UNUSED(type);
  76             Q_UNUSED(identifier);
  77
  78             m_messageType = type;
  79             m_description = description;
  80             m_sourceLocation = sourceLocation;
  81         }
  82
  83     private:
  84         QtMsgType m_messageType;
  85         QString m_description;
  86         QSourceLocation m_sourceLocation;
  87 };
  88 //! [4]
  89
  90 //! [0]
  91 MainWindow::MainWindow()
  92 {
  93     setupUi(this);
  94
  95     new XmlSyntaxHighlighter(schemaView->document());
  96     new XmlSyntaxHighlighter(instanceEdit->document());
  97
  98     schemaSelection->addItem(tr("Contact Schema"));
  99     schemaSelection->addItem(tr("Recipe Schema"));
 100     schemaSelection->addItem(tr("Order Schema"));
 101
 102     instanceSelection->addItem(tr("Valid Contact Instance"));
 103     instanceSelection->addItem(tr("Invalid Contact Instance"));
 104
 105     connect(schemaSelection, SIGNAL(currentIndexChanged(int)), SLOT(schemaSelected(int)));
 106     connect(instanceSelection, SIGNAL(currentIndexChanged(int)), SLOT(instanceSelected(int)));
 107     connect(validateButton, SIGNAL(clicked()), SLOT(validate()));
 108     connect(instanceEdit, SIGNAL(textChanged()), SLOT(textChanged()));
 109
 110     validationStatus->setAlignment(Qt::AlignCenter | Qt::AlignVCenter);
 111
 112     schemaSelected(0);
 113     instanceSelected(0);
 114 }
 115 //! [0]
 116
 117 //! [1]
 118 void MainWindow::schemaSelected(int index)
 119 {
 120     instanceSelection->clear();
 121     if (index == 0) {
 122         instanceSelection->addItem(tr("Valid Contact Instance"));
 123         instanceSelection->addItem(tr("Invalid Contact Instance"));
 124     } else if (index == 1) {
 125         instanceSelection->addItem(tr("Valid Recipe Instance"));
 126         instanceSelection->addItem(tr("Invalid Recipe Instance"));
 127     } else if (index == 2) {
 128         instanceSelection->addItem(tr("Valid Order Instance"));
 129         instanceSelection->addItem(tr("Invalid Order Instance"));
 130     }
 131     textChanged();
 132
 133     QFile schemaFile(QString(":/schema_%1.xsd").arg(index));
 134     schemaFile.open(QIODevice::ReadOnly);
 135     const QString schemaText(QString::fromUtf8(schemaFile.readAll()));
 136     schemaView->setPlainText(schemaText);
 137
 138     validate();
 139 }
 140 //! [1]
 141
 142 //! [2]
 143 void MainWindow::instanceSelected(int index)
 144 {
 145     QFile instanceFile(QString(":/instance_%1.xml").arg((2*schemaSelection->currentIndex()) + index));
 146     instanceFile.open(QIODevice::ReadOnly);
 147     const QString instanceText(QString::fromUtf8(instanceFile.readAll()));
 148     instanceEdit->setPlainText(instanceText);
 149
 150     validate();
 151 }
 152 //! [2]
 153
 154 //! [3]
 155 void MainWindow::validate()
 156 {
 157     const QByteArray schemaData = schemaView->toPlainText().toUtf8();
 158     const QByteArray instanceData = instanceEdit->toPlainText().toUtf8();
 159
 160     MessageHandler messageHandler;
 161
 162     QXmlSchema schema;
 163     schema.setMessageHandler(&messageHandler);
 164
 165     schema.load(schemaData);
 166
 167     bool errorOccurred = false;
 168     if (!schema.isValid()) {
 169         errorOccurred = true;
 170     } else {
 171         QXmlSchemaValidator validator(schema);
 172         if (!validator.validate(instanceData))
 173             errorOccurred = true;
 174     }
 175
 176     if (errorOccurred) {
 177         validationStatus->setText(messageHandler.statusMessage());
 178         moveCursor(messageHandler.line(), messageHandler.column());
 179     } else {
 180         validationStatus->setText(tr("validation successful"));
 181     }
 182
 183     const QString styleSheet = QString("QLabel {background: %1; padding: 3px}")
 184                                       .arg(errorOccurred ? QColor(Qt::red).lighter(160).name() :
 185                                                            QColor(Qt::green).lighter(160).name());
 186     validationStatus->setStyleSheet(styleSheet);
 187 }
 188 //! [3]
 189
 190 void MainWindow::textChanged()
 191 {
 192     instanceEdit->setExtraSelections(QList<QTextEdit::ExtraSelection>());
 193 }
 194
 195 void MainWindow::moveCursor(int line, int column)
 196 {
 197     instanceEdit->moveCursor(QTextCursor::Start);
 198     for (int i = 1; i < line; ++i)
 199         instanceEdit->moveCursor(QTextCursor::Down);
 200
 201     for (int i = 1; i < column; ++i)
 202         instanceEdit->moveCursor(QTextCursor::Right);
 203
 204     QList<QTextEdit::ExtraSelection> extraSelections;
 205     QTextEdit::ExtraSelection selection;
 206
 207     const QColor lineColor = QColor(Qt::red).lighter(160);
 208     selection.format.setBackground(lineColor);
 209     selection.format.setProperty(QTextFormat::FullWidthSelection, true);
 210     selection.cursor = instanceEdit->textCursor();
 211     selection.cursor.clearSelection();
 212     extraSelections.append(selection);
 213
 214     instanceEdit->setExtraSelections(extraSelections);
 215
 216     instanceEdit->setFocus();
 217 }