On Dec 23, 2010, at 6:34 AM, David Bovill wrote:
This one just caught me out. I have a script that checks a property
of it's
owner and returns the value. Specifically it checks the owner for a
property
of the same name to see when the local value is empty to see if it is
defined higher up in the object hierarchy. I thought this would be a
safe
way of implementing object oriented stuff.
But you get recursion when the control is a background, because the
owner of
a background is the card the background is on, but the card is
actually
below the background in the message hierarchy, so the background
script gets
triggered again when you look for it in the backgrounds owner.
A recursive tongue twister maybe - but just remember a background's
owner is
itself in scripting terms!
On the other hand, this utility function works fine for me:
function masterBG theObjectRef
put the long id of the owner of theObjectRef into onr
if word 1 of onr = "card" then
return theObjectRef
else
return masterBG(onr)
end if
end masterBG
It returns the highest level group a control belongs to. I have a
stack with two major backgrounds (switch between making one or the
other visible with a button). In my custom find function I need to
know which master background the foundfield is part of, and it may be
nested in lower level groups, so this tells me which bg to show when a
string is found, and it works reliably without the recursion problem
above.
-- Peter
Peter M. Brigham
pmb...@gmail.com
http://home.comcast.net/~pmbrig
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