>> If a stack's dynamicPaths property is true, when a handler in that stack >> uses the go or find command to go to a card other than the original card, >> that destination card's message path is inserted into the message path as >> long as the handler is on that card. > > > "I see," said the blind man, to the deaf dog. This entry might benefit from a > clarifying comment. > > Can someone explain precisely the difference between hyperCard's "dynamic > path behavior" and LiveCode's message path?
I looked this up to be sure (Jean DeVoto's got a diagram and explanation of the dynamic paths on this page: http://www.jaedworks.com/hypercard/HT-Masters/scripting.html - go to the section called "The Message Path"), but basically it goes like this: Imagine you have a stack with two cards, and a button the first card. The script of card one is empty. The script of card two is: on DoIt answer "I'm on card 2" end DoIt The script of button on card 1 is: on mouseUp go card 2 DoIt end mouseUp In HyperCard (or if the dynamicPaths property is true in LiveCode), you'll click the button, go to card 2 and the answer box will say "I'm on card 2". If the dynamicPaths is false (the default) and you click the button, you go to card 2, but then get a "can't find handler" error dialog. This is because with the dynamicPaths turned *off*, LC will look in the normal message path (from the button you clicked's perspective) to find the handler "DoIt". Since it's not in the script of card 1 or in the stack script, you get the error dialog. Turn it on, and card 2's script hierarchy (card/background/stack) is inserted *between* the stack script and the libraries/backscripts/engine. So this would mean the message would go: button 1 -> card 1 -> background(s) -> stack -> card 2 -> background(s) -> stack -> libraries/backscripts/etc -> Engine Hope I have this right... Ken Ray Sons of Thunder Software, Inc. Email: k...@sonsothunder.com Web Site: http://www.sonsothunder.com/ _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
