#getParentEventTarget
; this tree
must be directed acyclic graph. The meaning of default action(s)
in preventDefault is specific to a particular use case.
Implementations that do not support capture/bubble or can not have
a parent listenable can simply not implement any ability to set the
parent listenable (and have #getParentEventTarget
return
null).
Implementation of this class can be used with or independently from
goog.events.
Implementation must call #addImplementation(implClass)
.
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Marks a given class (constructor) as an implementation of
Listenable, do that we can query that fact at runtime. The class
must have already implemented the interface.
Arguments:
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No description.
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Reserves a key to be used for ListenableKey#key field.
Returns: number
A number to be used to fill ListenableKey#key
field.
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