Draw slider control with its lower left origin at (x, y) and size of (w, h),
where flags is one or multiple flags from BNDcornerFlags and state denotes
the widgets current UI state.
progress must be in the range 0..1 and controls the size of the slider bar
if label is not null, a label will be added to the widget
if value is not null, a value will be added to the widget, along with a ":" separator
widget looks best when height is BND_WIDGET_HEIGHT
Draw slider control with its lower left origin at (x, y) and size of (w, h), where flags is one or multiple flags from BNDcornerFlags and state denotes the widgets current UI state.
progress must be in the range 0..1 and controls the size of the slider bar
if label is not null, a label will be added to the widget
if value is not null, a value will be added to the widget, along with a ":" separator
widget looks best when height is BND_WIDGET_HEIGHT