Peter Haworth wrote:
I have a number of message handers set up as front scripts to carry
out standard processes on any cards in my stack,things like
closeField, selectionChanged, etc. The problem is it appears that
these scripts are being executed when the events they handle come from
the Rev IDE, which causes some pretty severe problems. I'm quite
surprised that the IDE would pass it's events to my front scripts
since they are part of my application not the IDE but be that as it
may, I need to find a way around this issue.
I've made execution of my front script code dependant on the current
tool being the pointer but that doesn't help when I'm in edit mode to
modify cards or scripts.
I guess my question is whether there is a better place to put these
scripts in the message path to avoid them being called from the IDE,
or if there is some reliable way to check if the messages they receive
are coming from my application stacks and not the IDE.
Forgive the seeming tautology, but put your handlers where you need 'em. ;)
FrontScript are handy, but they're available for a very specific
purpose: to catch ALL messages BEFORE objects get them.
If you need both of those conditions met, frontScripts will be hard to
beat. But for everything else there are many options:
- mainStack script: that way you'll only get the messages sent to your
main stack or substacks
- use "if" to differentiate whether to handle message or not, looking
for something like
if the effective filename of this stack is "MyStack" then...
- behaviors: assigning a behavior script to your objects will let you
handle those messages only for the objects to which the behavior is
attached.
This article may be helpful:
Extending the Runtime Revolution Message Path:
An introduction to using Libraries, FrontScripts, BackScripts and
Behaviors in Runtime Revolution's RevTalk Programming Language
<http://www.fourthworld.com/embassy/articles/revolution_message_path.html>
Note for Mark Wieder: Yes, I finally got around to adding mention of
"dispatch" there. :)
--
Richard Gaskin
Fourth World
Rev training and consulting: http://www.fourthworld.com
Webzine for Rev developers: http://www.revjournal.com
revJournal blog: http://revjournal.com/blog.irv
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