Promoting QLabel

Quote:

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Originally Posted by wysota

You should have received a warning in the console.

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No, At this time I am not receiving any warning.

If you opened the painter on a wrong object you should have received a warning. Take my code and change "viewport()" to "this", run the application and look at the console.

Yes, You are saying true in this regard; but I am telling about the below mentioned code.

Code:

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void paintEvent ( QPaintEvent * event )
{
QTextEdit::paintEvent(event);
QPainter painter(viewport());
painter.setPen(Qt::blue);
painter.drawLine(rect().topLeft(),rect().bottomRight());
}

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You said you "forgot to call viewport()". I understood that you didn't open a painter on it.