Engine.ReactiveBanana.Course

A process that is triggered, stepped for a while, then finished.

Useful to drive animations and filter other events and behaviors.

-- Set up a 1 second countdown
(startingE, startedE, starting) <-
  Course.setup (startE $> 1.0) $
    tickE $> old ->
      if old > dt then
        Right (old - dt)
      else
        Left ()

-- Prevent click events after starting the countdown
let clicks = fmap (Course.whenIdle starting) allClicks

Documentation

data Course a

Constructors

Idle

Waiting for a trigger event

Active a

Processing step events

Finished

A final event has fired

Instances

Functor Course

Defined in Engine.ReactiveBanana.Course

Methods

fmap :: (a -> b) -> Course a -> Course b

(<$) :: a -> Course b -> Course a

Show a => Show (Course a)

Defined in Engine.ReactiveBanana.Course

Methods

showsPrec :: Int -> Course a -> ShowS

show :: Course a -> String

showList :: [Course a] -> ShowS

Eq a => Eq (Course a)

Defined in Engine.ReactiveBanana.Course

Methods

(==) :: Course a -> Course a -> Bool

(/=) :: Course a -> Course a -> Bool

Ord a => Ord (Course a)

Defined in Engine.ReactiveBanana.Course

Methods

compare :: Course a -> Course a -> Ordering

(<) :: Course a -> Course a -> Bool

(<=) :: Course a -> Course a -> Bool

(>) :: Course a -> Course a -> Bool

(>=) :: Course a -> Course a -> Bool

max :: Course a -> Course a -> Course a

min :: Course a -> Course a -> Course a

setup

Arguments

:: Event a

Trigger event

-> Event (a -> Either final a)

Step event

-> MomentIO (Event a, Event final, Behavior (Course a))

(active event, finished event, current state)

General state-aware event filters

when :: (Course a -> Bool) -> Behavior (Course a) -> Event e -> Event e

unless :: (Course a -> Bool) -> Behavior (Course a) -> Event e -> Event e

Course state event filters

whenIdle :: Behavior (Course a) -> Event e -> Event e

whenActive :: Behavior (Course a) -> Event e -> Event e

whenFinished :: Behavior (Course a) -> Event e -> Event e

Course state predicates

isIdle :: Course a -> Bool

isActive :: Course a -> Bool

isFinished :: Course a -> Bool