How to get QSyntaxhighlighter's format outside?

[kkkiio]

I use QSyntaxHighlighter's subclass to highlight text, but when i use
QTextFormat format = cursorForPosition(event->pos()).charFormat()
in QPlainTextEdit::mousePressEvent, the format always is default.
So I search for a way to get the format which apply in highlighter.(QSyntaxHighlighter::formatis protected...)
help!!!

[SGaist]

Hi and welcome to devnet,

Out of curiosity, why do you need that information like that ?