constructor
The 'total' or the max-progress. setter
The 'total', or the max-progress. getter
the amount of progress. getter
the amount of progress. setter
background color, and bar's color
text and background colors
milliseconds after it scrolls 1 pixel, in case text too long to fit in 1 line
the text to display
Displays a left-to-right progress bar.
Can also display text (just like TextLabelWidget)