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highlighter.h Example File
richtext/syntaxhighlighter/highlighter.h

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    #ifndef HIGHLIGHTER_H
    #define HIGHLIGHTER_H

    #include <QHash>
    #include <QString>
    #include <QStringList>
    #include <QTextBlock>
    #include <QTextCharFormat>

    class QTextDocument;

    class Highlighter : public QObject
    {
        Q_OBJECT
    public:
        Highlighter(QObject *parent = 0);

        void addToDocument(QTextDocument *doc);
        void addMapping(const QString &pattern, const QTextCharFormat &format);

    private slots:
        void highlight(int from, int removed, int added);

    private:
        void highlightBlock(QTextBlock block);

        QHash<QString,QTextCharFormat> mappings;
    };

    #endif


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Qt 4.0.1