base interface for all event listeners interfaces.
Description
This key handler is similar to XKeyListener but allows the
consumption of key events. If a key event is consumed by one
handler both the following handlers, with respect to the list of key
handlers of the broadcaster, and a following handling by the
broadcaster will not take place.
This function is called by the broadcaster, an XExtendedToolkit for
instance, after a key has been pressed but before it is released.
The return value decides about whether other handlers will be
called and a handling by the broadcaster will take place.
This function is called by the broadcaster, an XExtendedToolkit for
instance, after a key has been pressed and released. The return
value decides about whether other handlers will be called and a
handling by the broadcaster will take place.
This function is called by the broadcaster, an XExtendedToolkit for
instance, after a key has been pressed but before it is released.
The return value decides about whether other handlers will be
called and a handling by the broadcaster will take place.
Consume the event if the action performed by the implementation
is mutually exclusive with the default action of the broadcaster or,
when known, with that of other handlers.
Consuming this event does not prevent the pending key-release
event from beeing broadcasted.
Parameter aEvent
The key event informs about the pressed key.
Returns
When false is returned the other handlers are called and a
following handling of the event by the broadcaster takes place.
Otherwise, when true is returned, no other handler will be
called and the broadcaster will take no further actions
regarding the event.
This function is called by the broadcaster, an XExtendedToolkit for
instance, after a key has been pressed and released. The return
value decides about whether other handlers will be called and a
handling by the broadcaster will take place.
Consume the event if the action performed by the implementation
is mutualy exclusive with the default action of the broadcaster or,
when known, with that of other handlers.
Parameter aEvent
The key event informs about the pressed key.
Returns
When false is returned the other handlers are called and a
following handling of the event by the broadcaster takes place.
Otherwise, when true is returned, no other handler will be
called and the broadcaster will take no further actions
regarding the event.
