Maintainer	Toshio Ito <debug.ito@gmail.com>
Safe Haskell	Safe
Language	Haskell2010

WildBind.FrontEnd

Description

Data types and type classes about front-ends.

You have to look at this module if you want to create a front-end implementation.

Synopsis

Documentation

Event from the front-end. s is the state of the front-end. i is the input.

Constructors

FEInput i	An event that a new input is made.
FEChange s	An event that the front-end state is changed.

Instances

(Eq s, Eq i) => Eq (FrontEvent s i) #
Methods (==) :: FrontEvent s i -> FrontEvent s i -> Bool # (/=) :: FrontEvent s i -> FrontEvent s i -> Bool #
(Ord s, Ord i) => Ord (FrontEvent s i) #
Methods compare :: FrontEvent s i -> FrontEvent s i -> Ordering # (<) :: FrontEvent s i -> FrontEvent s i -> Bool # (<=) :: FrontEvent s i -> FrontEvent s i -> Bool # (>) :: FrontEvent s i -> FrontEvent s i -> Bool # (>=) :: FrontEvent s i -> FrontEvent s i -> Bool # max :: FrontEvent s i -> FrontEvent s i -> FrontEvent s i # min :: FrontEvent s i -> FrontEvent s i -> FrontEvent s i #
(Show s, Show i) => Show (FrontEvent s i) #
Methods showsPrec :: Int -> FrontEvent s i -> ShowS # show :: FrontEvent s i -> String # showList :: [FrontEvent s i] -> ShowS #

data FrontEnd s i #

Interface to the front-end. s is the state of the front-end, i is the input.

Constructors

FrontEnd
Fields frontDefaultDescription :: i -> ActionDescription Default `ActionDescription` for inputs frontSetGrab :: i -> IO () Action to grab (or capture) the specified input symbol on the device. frontUnsetGrab :: i -> IO () Action to release the grab for the input symbol. frontNextEvent :: IO (FrontEvent s i) Action to retrieve the next event. It should block if no event is queued.