[REBOL] [vid] Re: Text Area scroll.
From: philb::upnaway::com at: 11-Dec-2003 11:41
Does anyone know why I had to insert the ugly line
if all [sl/data = 1 tmp = 1] [tmp: 0.999]
in this code.
if this line is commented out then even though the scroller data is set to 1 and the
face shown, the dagger in the scroller is not moved to the bottom?
To see this, comment out the above line in the code below, run the program and keep adding
new lines until the area scrolls. You see that the dagger gets smaller but in not moved
to the bottom even though sc/data is set to 1.
Below is the previous code but with some comments indicating what is going on.
title: "Area with scroller"
author: "Phil Bevan"
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
sc/redrag tx/size/y / tsize/y ; set dagger size = (area y size)/(text
ts-max: tsize/y - tx/size/y ; ts-max tmp: min 1 (- tx/para/scroll/y
/ ts-max) ; calculate slider position
if all [sc/data = 1 tmp = 1] [tmp: 0.999] ; ugly patch ???
sc/data: tmp ; set slider poition
show sc ; show scroller
lv-lay: layout [
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