In the past, I used the traitsui.wx.themed_slider_editor.ThemedSliderEditor to build a progress bar with a TraitsUI application with wx backend,
Item("model.progress",
label="Progress",
show_label=False,
style='readonly',
editor=ThemedSliderEditor(low=0.0,
high=1.0,
increment=0.05,
show_value=False))
What are the options for a progress bar with a QT5 backend? I see there is this https://github.com/enthought/traitsui/blob/master/traitsui/qt4/progress_editor.py but it seems to be for Qt4. So I'm not too sure how to continue?
Qt5 should be supported. See https://github.com/enthought/traitsui/blob/master/CHANGES.txt. If you encounter problems with this, please open an issue on GH.
Update:
Try something like this (partial, not tested):