[REBOL] Re: Scolling faces
From: rebol:optushome:au at: 15-Dec-2001 7:44
Hi Andrew,
The two events you need to trap are. scroll-line and scroll-page.
scroll-line detects the mouse scroll
scroll-page is mouse scroll +
Pseudo example below
detect: func [face event][
switch event/type [
scroll-line [do-myscroll event/offset/y * lineheight]
scroll-page [do-myscroll event/offset/y * pageheight]
]
]
The returned value for event/offset/y for scroll-line varies depending on
the mousescroll settings on the persons machine (ie how many lines they set
for mouse scrolling in their mouse software prefs, I have 3 in my prefs)
For most cases the values returned are.(or multiples there of)
for scroll-line
scrolling button forward: -3
scrolling button backward: 3
for scroll-page
scrolling button forward up: -1
scrolling button backward: 1
Cheers,
Allen K
