SDL.Time

Time Measurement

ticks :: MonadIO m => m Word32

Number of milliseconds since library initialization.

See SDL_GetTicks for C documentation.

time :: (Fractional a, MonadIO m) => m a

The current time in seconds since some arbitrary starting point (consist over the life of the application).

This time is derived from the system's performance counter - see SDL_GetPerformanceFrequency and SDL_GetPerformanceCounter for C documentation about the implementation.

Timer

delay :: MonadIO m => Word32 -> m ()

Wait a specified number of milliseconds before returning.

Users are generally recommended to use threadDelay instead, to take advantage of the abilities of the Haskell runtime.

See SDL_Delay for C documentation.

type TimerCallback = Word32 -> IO RetriggerTimer

A TimerCallback is called with the interval size of the callback. It can return information as to whether or not the timer should continue to exist.

data Timer

A timer created by addTimer. This Timer can be removed with removeTimer.

data RetriggerTimer

RetriggerTimer allows a callback to inform SDL if the timer should be retriggered or cancelled

Constructors

Reschedule Word32

Retrigger the timer again in a given number of milliseconds.

Cancel

Cancel future invocations of this timer.

Instances

Eq RetriggerTimer

Methods

(==) :: RetriggerTimer -> RetriggerTimer -> Bool

(/=) :: RetriggerTimer -> RetriggerTimer -> Bool

Data RetriggerTimer

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> RetriggerTimer -> c RetriggerTimer

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c RetriggerTimer

toConstr :: RetriggerTimer -> Constr

dataTypeOf :: RetriggerTimer -> DataType

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c RetriggerTimer)

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c RetriggerTimer)

gmapT :: (forall b. Data b => b -> b) -> RetriggerTimer -> RetriggerTimer

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> RetriggerTimer -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> RetriggerTimer -> r

gmapQ :: (forall d. Data d => d -> u) -> RetriggerTimer -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> RetriggerTimer -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> RetriggerTimer -> m RetriggerTimer

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> RetriggerTimer -> m RetriggerTimer

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> RetriggerTimer -> m RetriggerTimer

Ord RetriggerTimer

Methods

compare :: RetriggerTimer -> RetriggerTimer -> Ordering

(<) :: RetriggerTimer -> RetriggerTimer -> Bool

(<=) :: RetriggerTimer -> RetriggerTimer -> Bool

(>) :: RetriggerTimer -> RetriggerTimer -> Bool

(>=) :: RetriggerTimer -> RetriggerTimer -> Bool

max :: RetriggerTimer -> RetriggerTimer -> RetriggerTimer

min :: RetriggerTimer -> RetriggerTimer -> RetriggerTimer

Read RetriggerTimer

Methods

readsPrec :: Int -> ReadS RetriggerTimer

readList :: ReadS [RetriggerTimer]

readPrec :: ReadPrec RetriggerTimer

readListPrec :: ReadPrec [RetriggerTimer]

Show RetriggerTimer

Methods

showsPrec :: Int -> RetriggerTimer -> ShowS

show :: RetriggerTimer -> String

showList :: [RetriggerTimer] -> ShowS

Generic RetriggerTimer

Associated Types

type Rep RetriggerTimer :: * -> *

Methods

from :: RetriggerTimer -> Rep RetriggerTimer x

to :: Rep RetriggerTimer x -> RetriggerTimer

type Rep RetriggerTimer

type Rep RetriggerTimer = D1 * (MetaData "RetriggerTimer" "SDL.Time" "sdl2-2.4.1.0-GJ23ELiCVd1AQAhvhiAzSX" False) ((:+:) * (C1 * (MetaCons "Reschedule" PrefixI False) (S1 * (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 * Word32))) (C1 * (MetaCons "Cancel" PrefixI False) (U1 *)))

addTimer :: MonadIO m => Word32 -> TimerCallback -> m Timer

Set up a callback function to be run on a separate thread after the specified number of milliseconds has elapsed.

See SDL_AddTimer for C documentation.

removeTimer :: MonadIO m => Timer -> m Bool

Remove a Timer.

See SDL_RemoveTimer for C documentation.