A function to clear all of an activity.
A function to clear the currently portion of activity.
An additional function that determines whether the extender
is enabled. By default it is considered enabled if the application
active widget is contained in the tracker. If this is also
provided, the criterion is equivalent to
tracker.has(widget) && extender.isEnabled(widget)
A name for the thing to be cleared, used for labeling clearCurrent.
A plural name for the thing to be cleared, used for labeling clearAll.
A widget tracker for identifying the appropriate extender.
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Interface for an activity that wants to register a 'Clear...' menu item