Most classes of sheets will have one of the following input protocol classes mixed in. Of course, a sheet can always have a specialized method for a specific class of event that will override the default. For example, a sheet may need to have only pointer click events dispatched to itself, and may delegate all other events to some other input client. Such a sheet should have delegate-sheet-input-mixin as a superclass, and have a more specific method for dispatch-event on its class and pointer-button-click-event .
Summary: This class of sheet provides a method for dispatch-event that calls queue-event on each device event. Configuration events invoke handle-event immediately.
Summary: This class of sheet provides a method for dispatch-event that calls handle-event immediately for all events.
Summary: This is mixed into any sheet class that does not handle any input events.
Summary: This class of sheet provides a method for
on a designated substitute and the event. The initialization argument
:delegate or the accessor delegate-sheet-delegate may be used to set the recipient of dispatched events. A value of nil will cause input events to be discarded.
delegate-sheet-delegate [Generic Function]
(setf delegate-sheet-delegate) [Generic Function]
Arguments: delegate sheet
Summary: This may be set to another recipient of events dispatched to a sheet of class
delegate-sheet-input-mixin . If the delegate is nil , events are discarded.
Common Lisp Interface Manager 2.0 User's Guide - 3 Mar 2015