Observer
(gb)
This
class allows to catch the events raised by an
object before its
main
event observer gets them.
The observer object will raise the same events as the observed object, and so
you will handle them with the same handlers.
If you cancel an event in the observer event handler, the main event observer of the
observed object will never see it.
See the
TableView control source code for an example: it is implemented
by using this
method.
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The observer object is attached to the observed object, and is freed only when the observed object is freed too.
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