QTextEdit and custom paint event

steno

I have the following code snippet in a TextEdit paint event.

@
void TextEdit::paintEvent(QPaintEvent *e)
{
QPainter painter(viewport());

QAbstractTextDocumentLayout::Selection selection;
selection.cursor = textCursor();
selection.format = currentCharFormat();

QAbstractTextDocumentLayout::PaintContext ctx;
ctx.cursorPosition = textCursor().position();
ctx.selections.append(selection);

document()->documentLayout()->draw(&painter,ctx);

}
@

There are two problems I am looking to fix. The first problem is when I select text you do not see it as select. Second, the cursor is drawn but does not blink. Any suggestions?

dfaure

I assume this isn't a QTextEdit subclass, right?
(If not, why isn't this a qtextedit? it looks very much like one ;)

In QTextEdit the cursor blinking is done by a timer (see QTextControlPrivate::setBlinkingCursorEnabled) which calls update() on the right rectangle (see QTextControlPrivate::repaintCursor); you might have to do this by yourself if this isn't a QTextEdit.

For the selections, you need to give them a background color, currentCharFormat() will be "black on white" so basically it doesn't look different from when it's not selected. Looking at QTextControl::getPaintContext I'd say you need to do something like

@
QPalette::ColorGroup cg = d->hasFocus ? QPalette::Active : QPalette::Inactive;
selection.format.setBackground(ctx.palette.brush(cg, QPalette::Highlight));
selection.format.setForeground(ctx.palette.brush(cg, QPalette::HighlightedText));
@

? Offline

hi dfaure, pls markup the code

steno

Yes this is a subclass of QTextEdit. I do see that I have to do all the blinky cursor stuff myself. QPlainTextEdit has a really nice convenience function called getPaintContext that handles the state of the cursor for you, wish they had the same call in QTextEdit. oh well.