QSyntaxHighlighter(3qt) 												   QSyntaxHighlighter(3qt)

NAME

       QSyntaxHighlighter - Base class for implementing QTextEdit syntax highlighters

SYNOPSIS

       #include <qsyntaxhighlighter.h>

       Inherits Qt.

   Public Members
       QSyntaxHighlighter ( QTextEdit * textEdit )
       virtual ~QSyntaxHighlighter ()
       virtual int highlightParagraph ( const QString & text, int endStateOfLastPara ) = 0
       void setFormat ( int start, int count, const QFont & font, const QColor & color )
       void setFormat ( int start, int count, const QColor & color )
       void setFormat ( int start, int count, const QFont & font )
       QTextEdit * textEdit () const
       void rehighlight ()

DESCRIPTION

       The QSyntaxHighlighter class is a base class for implementing QTextEdit syntax highlighters.

       A syntax highligher automatically highlights parts of the text in a QTextEdit. Syntax highlighters are often used when the user is entering
       text in a specific format (for example, source code) and help the user to read the text and identify syntax errors.

       To provide your own syntax highlighting for QTextEdit, you must subclass QSyntaxHighlighter and reimplement highlightParagraph().

       When you create an instance of your QSyntaxHighlighter subclass, pass it the QTextEdit that you want the syntax highlighting to be applied
       to. After this your highlightParagraph() function will be called automatically whenever necessary. Use your highlightParagraph() function
       to apply formatting (e.g. setting the font and color) to the text that is passed to it.

       See also Basic Widgets and Text Related Classes.

MEMBER FUNCTION DOCUMENTATION

QSyntaxHighlighter::QSyntaxHighlighter ( QTextEdit * textEdit )
       Constructs the QSyntaxHighlighter and installs it on textEdit. Ownership of the QSyntaxHighlighter is transferred to the textEdit

QSyntaxHighlighter::~QSyntaxHighlighter () [virtual]
       Destructor. Uninstalls this syntax highlighter from the textEdit()

int QSyntaxHighlighter::highlightParagraph ( const QString & text, int endStateOfLastPara ) [pure virtual]
       This function is called when necessary by the rich text engine, i.e. on paragraphs which have changed.

       In your reimplementation you should parse the paragraph's text and call setFormat() as often as necessary to apply any font and color
       changes that you require. Your function must return a value which indicates the paragraph's end state: see below.

       Some syntaxes can have constructs that span paragraphs. For example, a C++ syntax highlighter should be able to cope with /*...*/ comments
       that span paragraphs. To deal with these cases it is necessary to know the end state of the previous paragraph (e.g. "in comment").

       If your syntax does not have paragraph spanning constructs, simply ignore the endStateOfLastPara parameter and always return 0.

       Whenever highlightParagraph() is called it is passed a value for endStateOfLastPara. For the very first paragraph this value is always -2.
       For any other paragraph the value is the value returned by the most recent highlightParagraph() call that applied to the preceding
       paragraph.

       The value you return is up to you. We recommend only returning 0 (to signify that this paragraph's syntax highlighting does not affect the
       following paragraph), or a positive integer (to signify that this paragraph has ended in the middle of a paragraph spanning construct).

       For example, if you're writing a simple C++ syntax highlighter, you might designate 1 to signify "in comment". For a paragraph that ended
       in the middle of a comment you'd return 1, and for other paragraphs you'd return 0. In your parsing code if endStateOfLastPara was 1, you
       would highlight the text as a C++ comment until you reached the closing */.

void QSyntaxHighlighter::rehighlight ()
       Redoes the highlighting of the whole document.

void QSyntaxHighlighter::setFormat ( int start, int count, const QFont & font, const QColor & color )
       This function is applied to the syntax highlighter's current paragraph (the text of which is passed to the highlightParagraph() function).

       The specified font and color are applied to the text from position start for count characters. (If count is 0, nothing is done.)

void QSyntaxHighlighter::setFormat ( int start, int count, const QColor & color )
       This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

void QSyntaxHighlighter::setFormat ( int start, int count, const QFont & font )
       This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

QTextEdit * QSyntaxHighlighter::textEdit () const
       Returns the QTextEdit on which this syntax highlighter is installed

SEE ALSO

       http://doc.trolltech.com/qsyntaxhighlighter.html http://www.trolltech.com/faq/tech.html

COPYRIGHT

       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included in the distribution for a complete license
       statement.

AUTHOR

       Generated automatically from the source code.

BUGS

       If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html.  Good bug reports help us to help you.
       Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially
       supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.  Please include the name of the manual page
       (qsyntaxhighlighter.3qt) and the Qt version (3.1.1).

Trolltech AS							  9 December 2002					   QSyntaxHighlighter(3qt)