On February 15, 2015 10:41:42 AM CST, Paul Dupuis <p...@researchware.com> wrote: >On 2/15/2015 10:02 AM, Graham Samuel wrote: >> But I do understand Paul's, which was very near the approach I was >thinking of taking myself. I suppose I am still worried about the >'send'. Sending isn't calling, is it? I mean, in principle, a handler >like "dopart2" in Paul's example will be executed, and then control >will return to the script that executed the 'send', won't it? So we end >up executing "end mouseUp" in the context of the button that was >clicked, not the script that was running in the 'startUp' handler. >Perhaps this doesn't matter, but this is the issue I'm trying to get my >head around. Anyway it's a viable solution and I'm grateful. > >send <message> to <object> -- is like a call. The handler waits until >message is executed before proceeding to the next statement > >send <message> to <object> in <time> -- places the message in the >message queue and the handler continues. The message queue then invokes >the message in the allotted time. > >So, > >on mouseUp > close this stack > send "doPart2" to <main stack> >end mouseUp > >will not do what you want as the send executes "doPart2" and the >completes the mouseUp, but > >on mouseUp > close this stack >send "doPart2" to <main stack> in 10 milliseconds -- or some non-zero >time >end mouseUp > >causes doPart2 to execute in the context of the main stack AFTER the >mouseUp handler has completed. > >If I recall correctly, Richard Gaskin produced an excellent short 1 or >2 >page guide on message passing in LiveCode. A *must have* reference if >you're still learning all the ins and outs. It looks like he's expanded >it from the one I remember as well. See >http://www.fourthworld.com/embassy/articles/revolution_message_path.html > > >_______________________________________________ >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
Actually you can send in 0, which will execute right after the handler completes, or even in - 1 which pushes the request to the front of the queue ahead of all other pending messages. I learned that last trick from Dar a while back. -- Jacqueline Landman Gay | jac...@hyperactivesw.com HyperActive Software | http://www.hyperactivesw.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
