Hi Scott et al, The 'after' handler in the behavior script will be executed even if the control script itself contains an 'on' handler which forgets to 'pass' the message. This is really useful for custom controls where you want to allow the developer to implement standard message handlers but ensure the control instance returns to a normal state.
Let's say you have your own implementation of a button control. Your behavior script would handle 'before mouseDown' to turn on the hilited appearance, and handle 'after mouseUp' and 'after mouseRelease' to turn off the hilited appearance. Now the developer can simple handle 'on mouseUp' to execute his business logic, and doesn't have to remember to include a 'pass mouseUp' to ensure the appearance is restored. At first I was skeptical about behaviors, as I could do everything I needed using frontscripts and backscripts. Its convenience was in having all code in one place, but there were still waysd for the custom control user to mess things up (by not passing messages). So thanks to the addition of 'before' and 'after' message handlers and chained behaviors, this feature has really matured and everyone should use it :) Jan Schenkel. ===== Quartam Reports & PDF Library for LiveCode www.quartam.com ===== "As we grow older, we grow both wiser and more foolish at the same time." (La Rochefoucauld) -------------------------------------------- On Tue, 3/18/14, Scott Rossi <sc...@tactilemedia.com> wrote: Subject: Re: before vs on in behavior scripts To: "LiveCode Mail List" <use-livecode@lists.runrev.com> Date: Tuesday, March 18, 2014, 7:54 PM I didn't realize it until just now, but this is the order of events: before mouseUp answer "A" end mouseUp on mouseUp answer "B" end mouseUp after mouseUp answer "C" end mouseUp Really cool stuff for custom behaviors, but I'm still trying to come up with a nifty use for the "after" event. Regards, Scott Rossi Creative Director Tactile Media, UX/UI Design On 3/18/14 7:44 PM, "Scott Rossi" <sc...@tactilemedia.com> wrote: >How are you determining that "on" isn't working? Is it possible that "on" >is executing immediately after "before"? > >Placing the following in a behavior script works fine here: > >before mouseUp > answer "A" >end mouseUp > >on mouseUp > answer "B" >end mouseUp > > >If you need some kind of alternate behavior to take place after "before" >that isn't "on", you might consider "after". I know, it's a lot of >prepositions ... > >Regards, > >Scott Rossi >Creative Director >Tactile Media, UX/UI Design > > > > >On 3/18/14 4:33 PM, "Devin Asay" <devin_a...@byu.edu> wrote: > >>All, >> >>If a button has a behavior attached to it, and the behavior script has a >>'before mouseUp' handler, can the behavior script also have a 'on >>mouseUp' handler? >> >>I could swear the answer was yes; I thought I had done that before, but >>now when I try it, it doesn't work. (In LC 6.5.x. and 6.6.0RC2). Instead >>I have to put the 'in mouseUp' in the button's script. >> >>Of course I might be completely missing the point of 'before' and 'after' >>handlers. Wouldn't be the first time. >> >>Regards, >> >>Devin >> >> >>Devin Asay >>Office of Digital Humanities >>Brigham Young University >> >>_______________________________________________ >>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 >> > > > >_______________________________________________ >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 > _______________________________________________ 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 _______________________________________________ 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
