Control.Event
Description
A simple event mechanism
- class (Eq delta, Ord delta, Show delta) => EventSelector delta
- class EventSelector delta => Event beta delta | beta -> delta, delta -> beta where
- getSelector :: beta -> delta
- class (Monad gamma, Event beta delta) => EventSource alpha beta gamma delta | alpha -> beta, alpha -> gamma where
- getHandlers :: alpha -> gamma (Handlers beta gamma delta)
- setHandlers :: alpha -> Handlers beta gamma delta -> gamma ()
- myUnique :: alpha -> gamma Unique
- canTriggerEvent :: alpha -> delta -> Bool
- triggerEvent :: alpha -> beta -> gamma beta
- registerEvent :: alpha -> delta -> Either (beta -> gamma beta) Unique -> gamma (Maybe Unique)
- type Handlers beta gamma delta = Map delta [(Unique, beta -> gamma beta)]
Documentation
class (Eq delta, Ord delta, Show delta) => EventSelector delta Source
Every event needs a selector, which should identify the type of event
Instances
class EventSelector delta => Event beta delta | beta -> delta, delta -> beta whereSource
Every event needs to know its selector and its source
Methods
getSelector :: beta -> deltaSource
Instances
class (Monad gamma, Event beta delta) => EventSource alpha beta gamma delta | alpha -> beta, alpha -> gamma whereSource
Everything which is an event source needs this
Methods
getHandlers :: alpha -> gamma (Handlers beta gamma delta)Source
setHandlers :: alpha -> Handlers beta gamma delta -> gamma ()Source
myUnique :: alpha -> gamma UniqueSource
canTriggerEvent :: alpha -> delta -> BoolSource
Reimplement this in instances to make triggering of events possible
triggerEvent :: alpha -> beta -> gamma betaSource
Returns the event, so that you may get values back from an event
registerEvent :: alpha -> delta -> Either (beta -> gamma beta) Unique -> gamma (Maybe Unique)Source
use Left to register and Right to unregister returns Unique if registration was successfull, else Nothing
Instances