Control.Event

Description

A simple event mechanism

Synopsis

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 -> (beta -> gamma beta) -> gamma (Maybe Unique)

unregisterEvent :: alpha -> delta -> Unique -> gamma ()

type Handlers beta gamma delta = Map delta [(Unique, beta -> gamma beta)]

registerEvents :: EventSource alpha beta gamma delta => alpha -> [delta] -> (beta -> gamma beta) -> gamma [Unique]

Documentation

class (Eq delta, Ord delta, Show delta) => EventSelector delta

Source

Every event needs a selector, which should identify the type of event

Instances

EventSelector GUIEventSelector

class EventSelector delta => Event beta delta | beta -> delta, delta -> beta where

Source

Every event needs to know its selector and its source

Methods

getSelector :: beta -> delta

Source

Instances

Event GUIEvent GUIEventSelector

class (Monad gamma, Event beta delta) => EventSource alpha beta gamma delta | alpha -> beta, alpha -> gamma where

Source

Everything which is an event source needs this alpha is the Notifier beta is the event gamma is the monad delta is the event selector

Methods

getHandlers :: alpha -> gamma (Handlers beta gamma delta)

Source

setHandlers :: alpha -> Handlers beta gamma delta -> gamma ()

Source

myUnique :: alpha -> gamma Unique

Source

canTriggerEvent :: alpha -> delta -> Bool

Source

Reimplement this in instances to make triggering of events possible

triggerEvent :: alpha -> beta -> gamma beta

Source

Returns the event, so that you may get values back from an event Args: Notifier, Event

registerEvent :: alpha -> delta -> (beta -> gamma beta) -> gamma (Maybe Unique)

Source

unregisterEvent :: alpha -> delta -> Unique -> gamma ()

Source

use Left to register and Right to unregister Args: Notifier, EventSelector, Unique

Instances

EventSource Notifier GUIEvent IO GUIEventSelector

type Handlers beta gamma delta = Map delta [(Unique, beta -> gamma beta)]

Source

This shows the implementation of the event mechnism

registerEvents :: EventSource alpha beta gamma delta => alpha -> [delta] -> (beta -> gamma beta) -> gamma [Unique]

Source

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