Question #278990 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/278990
Status: Open => Answered
RaiMan proposed the following answer:
at 1:
one Region OBJECT -> one observer -> one to many registered events
BeAware: different Region objects might represent the same area on the screen,
so it is possible, to run more than one observer for the same area on the
screen (another question is, wether this makes sense).
at 2:
each event registered with a region is for the script runtime (currently there
is no feature to un-register events) and it is not checked currently, wether
the event uses the same image and same handler like an already registered event
(on the list for version 2).
So if you stop the observation and start it again later, all registered events
are honored again.
at 3: Both onAppear and onVanish immediately call the handler if the respective
situation is detected:
- on Appear: image there already
- onVanish: image not found at first try
... for the rest see:
http://sikulix-2014.readthedocs.org/en/latest/region.html#observing-visual-events-in-a-region
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