QProgressBar and stylesheet: best way to add a vertical bar

[JulienMaille]

I would like to display a treshold value in my progressbar:
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I already style QProgressBar and QProgressBar::chunk to color my bar and background with nice gradients, and now I want to add this vertical line. What's the smartest way to do this?
Ideally I would like to have this treshold displayed on top of the chunk.
Should I play with background-image or another tag?

[giesbert]

One possibility is to use a custom progress bar class, overwrite paint event, call default painting for the styling and draw the threshold value afterwards on top.

Background image would be behind the chunk :-(

[JulienMaille]

I finally took a few minutes to subclass my progressbar.
I added a QRubberBand to handle a min and max threshold (for hysteresis). Works great for little to no efforts!

I am now wondering if I can set a styleSheet on a QRubberBand to alter color and opacity!