detecting when a script is drawing and/or manipulating....

Hello,

I want to know if it is safe (and will be safe) to say that a canvas is drawing something if it is exposing a DrawingHandle as an ouput port, and equivalently, a ManipHandle when needing to manage events?

It is just a question of speed... not running the draw or event loop on every canvas when only a few might need it!!!

Thanks,

Pierre

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