[PySide] cannot expand the progress bar to the full width of status bar

[iMath]

I want the progress bar to expand to the full width of status bar,but why there is a gap there?

Is there a widget there or something else ?‍

some code here

http://stackoverflow.com/questions/27476894/cannot-expand-the-progress-bar-to-the-full-width-of-status-bar‍




PS. can I add some text on the progress bar,there is no function like setText(), how can I do this ?‍
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