Draw scrollbar with its lower left origin at (x, y) and size of (w, h), where state denotes the widgets current UI state.
offset is in the range 0..1 and controls the position of the scroll handle
size is in the range 0..1 and controls the size of the scroll handle
horizontal widget looks best when height is BND_SCROLLBAR_HEIGHT,
vertical looks best when width is BND_SCROLLBAR_WIDTH
See Implementation
Draw scrollbar with its lower left origin at (x, y) and size of (w, h), where state denotes the widgets current UI state.
offset is in the range 0..1 and controls the position of the scroll handle
size is in the range 0..1 and controls the size of the scroll handle
horizontal widget looks best when height is BND_SCROLLBAR_HEIGHT,
vertical looks best when width is BND_SCROLLBAR_WIDTH