QAbstractScrollArea forces repainting the whole viewport

[Charletes]

And what is wrong with QPlainTextEdit?

I'd like to be able to implement a column-mode, and as far as I know that can't be done using QPlainTextEditor.

That's not how it's done. Use QAbstractScrollArea::setViewportMargins() and place your line counting widget in the blank space left by the viewport.

I didn't know that it could be done that way. I'll try it, it seems to be easier that way.

Thanks!

[wysota]

I'd like to be able to implement a column-mode, and as far as I know that can't be done using QPlainTextEditor.

I don't know what "column mode" is but there is a good chance it can be implemented on top of what QPlaintTextEdit offers.

[Charletes]

What most text editors call column-mode is the posiblity on writing on several lines at once and being able to select a square of text instead of lines. Emacs call it rectangle mode I think.

[wysota]

I don't see a reason why this couldn't be implemented with QPlainTextEdit.