| Safe Haskell | Safe |
|---|---|
| Language | Haskell98 |
Reflex.TriggerEvent.Class
Description
This module defines TriggerEvent, which describes actions that may create
new Events that can be triggered from IO.
Synopsis
- class Monad m => TriggerEvent t m | m -> t where
- newTriggerEvent :: m (Event t a, a -> IO ())
- newTriggerEventWithOnComplete :: m (Event t a, a -> IO () -> IO ())
- newEventWithLazyTriggerWithOnComplete :: ((a -> IO () -> IO ()) -> IO (IO ())) -> m (Event t a)
Documentation
class Monad m => TriggerEvent t m | m -> t where Source #
TriggerEvent represents actions that can create Events that can be
triggered by IO actions.
Methods
newTriggerEvent :: m (Event t a, a -> IO ()) Source #
Create a triggerable Event. Whenever the resulting function is called,
the resulting Event will fire at some point in the future. Note that
this may not be synchronous.
newTriggerEventWithOnComplete :: m (Event t a, a -> IO () -> IO ()) Source #
Like newTriggerEvent, but the callback itself takes another callback,
to be invoked once the requested Event occurrence has finished firing.
This allows synchronous operation.
newEventWithLazyTriggerWithOnComplete :: ((a -> IO () -> IO ()) -> IO (IO ())) -> m (Event t a) Source #
Like newTriggerEventWithOnComplete, but with setup and teardown. This
relatively complex type signature allows any external listeners to be
subscribed lazily and then removed whenever the returned Event is no
longer being listened to. Note that the setup/teardown may happen multiple
times, and there is no guarantee that the teardown will be executed
promptly, or even at all, in the case of program termination.