[REBOL] Re: Dynamic scroller step adjustment

From: antonr:iinet:au at: 27-Feb-2004 0:18

ratio is your friend.
For example, to set ratio of a vertical scroller vscroll:

	vscroll/ratio: visible / total-height

and here's a cutting, showing how to set the step:

	; step = 1 / (total rows - visible rows)
	use [y][
		y: max 0 ((length? list-data) - rows)
		vscroll/step: either 0 = y [1][1 / y] ; prevent division by zero
	]

Anton.

1 · 2 · [3] · 4 · See whole thread