Implementing multi-selection in QTextEdit

Hi all,

I’m developing a QTextEdit-based editor, and I need to implement “block mode”. In that mode, rectangular blocks must be selected, instead of standard continuous selection. The pic below illustrates what I mean.

To be honest, I’ve already implemented that mode using the QTextEdit::ExtraSelection class and setExtraSelections() function, but the code looks not very well and there are still some issues.

So, any ideas? All I’ve googled is a suggestion to use Q3TextEdit which somehow supports multi-selection, but, of course, that is not what I need. I can post my code if necessary.