PagesObserver

[paul.mcalenan]

Why is the following…

module PaulMcAlenan	
	module Test

	extend self

	class MyPagesObserver < Sketchup::PagesObserver

		def onContentsModified(pages)
			pagename = pages.selected_page.name
			puts pagename
		end
		
	end

Sketchup.active_model.pages.add_observer(MyPagesObserver.new)

	end
end

displaying multiple puts in the console when change the scene…

[DanRathbun]

@paul.mcalenan

Why is the following… [ PagesObserver ] displaying multiple puts in the console when change the scene…

This was previously discussed and Thomas summed it up in this API tracker issue …

• Issue 237 : Add observer event to detect active scene change

… which is an echo of the forum post:

Detect scene activation

I did some digging in the source and found that there is actually events being fired. But there is a lot of noise there that makes it less than ideal for an API. Sketchup::PagesObserver#onContentsModified is triggered when: kPageMoved kSelectedPageChanged kNameChanged kRemoveAll kPageActivate “changed” vs “active” you ask? Good question - that’s some internal implementation noise leaking through. When the active page is changed you get two calls to onContentsModified. The first one is befor…

[DanRathbun]

If it is only the change to a new scene page you wish to watch, you could consider implementing a FrameChangeObserver and ignoring all the frames in between 0 (0.0) and 100 (1.0) percent.