Paul - as a followup to that, do you understand the difference between "pass" and "send"? If you want only the engine, or some other component to handle a message, you would "send" it. If you want a handler to let a message continue up the chain so that another handler can deal with it, you can "pass" it.
If you want fine-grained control, make sure you understand the position of your handler in the path, especially with front and backscripts also getting a voice. On Mon, May 23, 2016 at 10:35 AM, Mike Kerner <mikeker...@roadrunner.com> wrote: > You only need to pass a message if you don't want another handler for that > message to possibly get in the way. If you don't have a keyDown handler in > any of your scripts in the message path, the engine will get and handle it. > > On Mon, May 23, 2016 at 9:13 AM, Paul Dupuis <p...@researchware.com> > wrote: > >> In LiveCode some messages must be passed to the engine for the engine's >> normal processing of the message. And with current versions of LC you >> have the very handy 'pass <message> to top' to send it directly to the >> engine. >> >> For example, rawkeyDown must be passed for LiveCode to handle key >> presses other than what you are trapping (unless you want all keypresses >> trapped). Some message line preOpenStack you don't need to pass. The >> stack still opens without passing a preOpenStack to the the engine. >> >> Does anyone have a compiled list of which messages need to be passed or >> *should* be passed vs those that you do not have to concern yourself with? >> >> In some dictionary entries, like for rawKeyDown, it talks about the need >> to pass the message (unless you want to trap all key presses). In other >> dictionary entries it is not clear whether the message needs to be >> passed or not. I am not sure that if it doesn't state one way or another >> assuming one way or another is wise. >> >> I know there have been some excellent flow charts of LiveCode's message >> passing hierarchy (Richard Gaskin's comes to mind) but I don't recall >> seeing any summation of which messages should be passed vs which do not >> need to be? >> >> >> _______________________________________________ >> 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 >> > > > > -- > On the first day, God created the heavens and the Earth > On the second day, God created the oceans. > On the third day, God put the animals on hold for a few hours, > and did a little diving. > And God said, "This is good." > -- On the first day, God created the heavens and the Earth On the second day, God created the oceans. On the third day, God put the animals on hold for a few hours, and did a little diving. And God said, "This is good." _______________________________________________ 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
