[REBOL] Re: [vid] Re: Text Area scroll.
From: philb:upnaway at: 11-Dec-2003 19:35
Hi Gabrielle,
That is great Gabrielle .... it wasnt just me going mad then !!!
Have you submitted this patch for the consideration as part of vid 1.3 ?
The updated area/scroller program is as follows :
rebol [
title: "Area with scroller"
author: "Phil Bevan"
date: 10-Dec-2003
version 0.0.2
]
stylize/master
[
Slider: Slider with [
use [c] [
c: second :redrag
either 15470763 = checksum mold c [
insert c [state: none]
] [print "CANNOT APPLY SLIDER PATCH!"]
]
]
Scroller: Scroller with [
use [c] [
c: second :redrag
either 15470763 = checksum mold c [
insert c [state: none]
] [print "CANNOT APPLY SCROLLER PATCH!"]
]
]
]
pos-scroll: func [tx sc /local tsize ts-max tmp] [
tsize: size-text tx ; calculate size of text
either tsize/y <= tx/size/y ; is text is smaller
[sc/redrag 1 sc/data: 0] ; set dagger to 1, slider data to
0
[
sc/redrag tx/size/y / tsize/y ; set dagger size = (area y size)/(text
y size)
show sc
ts-max: tsize/y - tx/size/y ; ts-max = maximum value of top of dagger
tmp: min 1 (- tx/para/scroll/y / ts-max) ; calculate slider position
sc/data: tmp ; set slider poition
]
show sc ; show scroller
]
lv-lay: layout [
space 0
across
tx: area 400x200 feel [
engage: func [face action event] [
ctx-text/edit/engage face action event
if all [event/type = 'key] [pos-scroll tx scrl]
]
]
scrl: scroller 16x200 [scroll-para tx scrl]
]
pos-scroll tx scrl ; set initial dagger size
view lv-lay
