Is there anyway add event listener on components?
For example, add a change-listener on one component, once it’s changed or deleted, a log can be stored.
our team work on one shared model, we need to know how and when the model is modified.
By the way, does sketchup have teamwork mode?
Yes.
You attach an observer with the above callbacks using a …
… and an …
Not at the same time. But SketchUp ships with a plugin for Trimble Connect, which is a collaboration platform in the cloud.
thx a lot
I’ve read ruby api and thought “observer” as something about camera 
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