While experimenting with scrolling on iOS (as per my earlier mail), I came
across something odd. Probably finger trouble on my part, but can anyone
explain it?
I set up a little scrolling experiment based on the example offered in the LC
Scroller Example stack. I have an iPhone screen with a kind of window in the
middle, and a group "tScrollGroup" that scrolls behind ("through") the window.
As usual, I make the scroll act via a scrollerDidScroll handler, so that for
example when the handler fires, I use the x (horizontal) offset from the
handler to set the hscroll of my group - for this experiment I'm only using
horizontal scrolling. This works well, apart from some strange stuff with
bouncing which isn't what this mail is about.
When I run this little example in the iOS Simulator, I can scroll my group back
and forth as expected, so its location must have changed, I think: but when I
query the location of the group it never changes! I do the querying within the
script of the scrollerDidScroll handler. The whole handler script is:
on scrollerDidScroll pOffsetX, pOffsetY
lock screen
set the hScroll of group "tScrollGroup" to pOffsetX
unlock screen
infoMsg "scrollerDidScroll fired with x =" && pOffsetX & "; loc of
tScrollGroup is now:" && (the loc of grp "tScrollGroup")
end scrollerDidScroll
This message arrives in the Console window as normal, with x changing values as
expected, and the loc of the group always the same.
Why is this so, and what am I seeing move if it's not my group?
Puzzled
Graham
Incidentally, trying to make sense of hscroll via the IDE (i.e. not in iOS), I
can't seem to make a group move by changing its hscroll. Clearly there's
something I don't understand.
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