Definition Observer

[kwalkerman]

Hello,

I'm trying to use definition observers in a script instead of multiple entities observers because they seem to be a little more stable. There are a number of quirky things about it, but one that I haven't been able to work around is as follows:

When I add a component instance to the model, the onComponentInstanceAdded method fires. However, if I delete the component instance and then undo, onComponentInstance added does NOT fire. I need to be notified both of new instances and of instances that are back from the dead.

Any ideas?

Thanks a bunch,

Karen

[TIG]

Use a combination of definitions observer and definition observer.
Add a definition observers to each of the definitions.
When a definition is added/deleted to/from definitions you know.
You now know that definition - add an observer to that too.
When any definition has instances added/removed you know as its observer tells you...

[kwalkerman]

...
except that onInstanceRemoved doesn't fire
and onInstanceAdded doesn't fire for a delete-undo event

... I think I'm going back to entities observers... seems more stable in SU8

[thomthom]

Yea - definition observer has been troublesome all along: http://www.thomthom.net/software/sketchup/observers/#DefinitionObserver

[TIG]

Crib from my '#HolePunchTool.rb'...
That uses definition and definitions [and several other] observers, and a global [$] array of things that is adjusted as we go...
It seems to work OK for me, to keep track of Hole-Punching Instances etc and control copying, etc...
Have a look - the observers code is near the end of the script...
You might be able to adjust its ideas to your needs...

[kwalkerman]

Thanks TIG.

TT - I revisited your observers chart page after posting the initial message. Definitely very helpful. Thanks for maintaining it.

--
Karen