Question

How can one obtain the following effect for text in a QProgressBar from Qt? :

The ideea is that I must have a brighter color in the left part of the progress bar.

Answer 1

I would do the custom drawing as follows:

1. Derive your own progress bar class from QLabel.

2. Overwrite the paintEvent() function.

3. In paintEvent(), start drawing with a QPainter:

   • draw the secondary background rectangle
   • draw the text in the secondary color with drawText()
   • draw the first background rectangle (overdrawing first part of text)
   • draw the text in the first color within a rectangle matching the first background rectangle: http://qt-project.org/doc/qt-4.8/qpainter.html#drawText-11

You should end up with what you want to achieve. Due to Qt’s default double buffering you should observe no flicker.