Jacque, This is a great overview of how groups work. I am so saving this in my notes. With attribution, of course!
Devin On Aug 21, 2012, at 10:23 PM, J. Landman Gay wrote: > On 8/21/12 10:23 PM, dunb...@aol.com wrote: > >> And so a group, being an object that contains other objects, has no >> unequivocal place in the hierarchy. > > There's an order. It's changed a couple of times, but as I understand it, the > system is: > > 1. Card groups > BackgroundBehavior: false > Shared: no, only appears on one card > Messages: > control -> group -> card -> background(s) -> stack > Event messages: no > > > 2. Shared card groups > BackgroundBehavior: false > Shared: yes, if placed on multiple cards > Messages: > control -> group -> card -> background(s) -> stack > Event messages: no > > > 3. Background groups > BackgroundBehavior: true > Shared: yes > Messages: > Unplaced groups (not on any card): receive no messages > Placed groups, when a grouped control is clicked: > control -> group -> card -> other background(s) -> stack > Placed groups, when clicked outside any control: > card -> group -> other background(s) -> stack > Event messages: yes > > > Unplaced groups can serve as resource storage for images, icons, behavior > buttons, etc. and can be referenced by anything in the stack. They are not in > the message hierarchy. > > Numbers 1 and 2 are very similar and could probably be consolidated into > simply "card groups". Shared card groups were removed from a recent version, > and any group that was placed on multiple cards was automatically set to have > its backgroundBehavior = true. But people had been sharing non-background > groups and the change broke their stacks, so they were put back in again. > > When not dealing with mouse messages, background groups always receive event > messages after the card, and handler calls will travel through them on their > way to the stack script. Card groups, both shared and unshared, do not > receive event messages because they are "on top" of the card, and engine > messages are always sent to the card. Handler calls from the card will not > reach card groups either unless specifically "sent" there. > > That's my current understanding but if any of it's wrong, someone please > correct me. Devin Asay Humanities Technology and Research Support Center 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
