[REBOL] Re: [scrolling] Scroll-wheel problem with area
From: greggirwin:mindspring at: 3-Aug-2004 9:08
Hi Carl,
CR> I've been writing a routine to add scroll-wheel support to scripts
CR> and I've hit a slight snag with stopping an area scrolling out of
CR> the top of its box - ie, I can't see any way to do it. :-)
CR> With text-lists you have lc and the length of the list's block to
CR> control this, but I can't find how to get such values with an area
CR> or any other way it could be done. With areas I'm changing
CR> their para/scroll/y value to scroll them.
Have you looked at the source for EDITOR? Here are some pertinent
bits:
scroll-to: func [txt /local xy] [
xy: (caret-to-offset t1 txt) - t1/para/scroll
t1/para/scroll: min 0x0 t1/size / 2 - xy
s1/data: (second xy) / max 1 second size-text t1
show [s1 t1]
]
scroll-edit: func [page n] [
s1/data: s1/data + (n *
(either page [t1/size/y] [t1/font/size]) / max 1 second size-text t1
)
show s1
scroll-para t1 s1
]
init: does [
ed-lo/feel: make ed-lo/feel [
detect: func [face event] [
switch event/type [
offset [save-prefs]
scroll-line [scroll-edit false event/offset/y]
scroll-page [scroll-edit true event/offset/y]
resize [
resize max 100x64 ed-lo/size
refresh
save-prefs
return true
]
key [switch event/key keymap]
close [quit-edit]
]
event
]
]
]
-- Gregg