Edge observer

[inteloide]

Hello,

For one of my plugin, I want to catch when a component is modified (ie entities inside the component are moved, stretched, erased, added, etc).

My problem is to trigger an observer when moving an edge (single edge not attached to a face) using moving tool.

Do do so, I placed an observer on model to catch when the active path is changed, and then add on observer on entities within active_entities :

class MyModelObserver < Sketchup;;ModelObserver
	
	@@observers = {}
	@@previous_path=nil


	def onActivePathChanged(model)
		puts "onActivePathChanged "+Sketchup.active_model.active_entities.to_s
		#remove previous observer if exist
			if @@previous_path!=nil then
				puts "Remove observers of "+@@previous_path.to_s
				p @@previous_path.remove_observer(@@observers[@@previous_path])
				@@previous_path=nil
			end
		
		#Quit if active_path is nill (no group or component is opened)
			return if !Sketchup.active_model.active_path
		
		#define observer object and try to add it to active_entities
		#if it is successfully added, update class variable @@observers
			observer = MyEntitiesObserver.new()
			if Sketchup.active_model.active_entities.add_observer(observer)
				#Save observers data
					@@observers[Sketchup.active_model.active_entities] = observer
					@@previous_path=Sketchup.active_model.active_entities
				
				#Add observers to each entity of active_entities
					for entity in Sketchup.active_model.active_entities
						entity.add_observer(MyEntityObserver.new)
					end
			end
	end
end


class MyEntityObserver < Sketchup;;EntityObserver
	def onEraseEntity(entity)
		puts "onEraseEntity; #{entity}"
	end
	def onChangeEntity(entity)
		puts "onChangeEntity; #{entity}"
	end
end

class MyEntitiesObserver < Sketchup;;EntitiesObserver
	def onElementAdded(entities, entity)
		puts "onElementAdded "
	end
	def onElementModified(entities, entity)
		puts "onElementModified "
	end
	def onElementRemoved(entities, entity_id)
		puts "onElementRemoved"
	end
	def onEraseEntities(entities)
		puts "onEraseEntities" 
	end
	
	def onChangeEntity(entity)
	  puts "onChangeEntity; #{entity}"
	end
end

Then running the script :

Sketchup.active_model.add_observer(MyModelObserver.new)

I cannot see any "modification" observer triggers when when moving a simple edge not attached to a face, within a component...

If someone can help me...
Inteloide

[inteloide]

Well, a start of explaination and solution, here :
http://forums.sketchup.com/t/edge-change-observer/8184 :

Put an observer on edge.start and edge.end

Thanks TT !