1.131 class recogniser

Class recogniser is an almost empty super-class. It's main purpose is to serve as a type-check for it's sub-classes.

A recogniser is an object that maps a user event onto an action. The events origins from the window on which it occurred and is dispatched by the dispatching behaviour defined by device->event.

A recogniser may be attached to a graphical object using graphical ->recogniser' or it may be used from a redefined graphical recogniser->event‘method. Multiple recognisers may be combined to a single entity using class handler_group.

See also

- graphical->event
- class event
- topic Handling Events
- object->recogniser
- class interceptor
- object<-all_recognisers
- object->prepend_recogniser

1.131.1 Instance variables

recogniser <-> active: bool

Recognisers can be made inactive using recogniser->active: @off. The method recogniser->event fails for inactive recognisers.

1.131.2 Send methods

recogniser ->event: event

Process an event. The method defined at the level of class recogniser itself simply fails.

recogniser ->initialise:

Create a recogniser object. Initialises recogniser->active to @on. Creating instances of this class is no common use.