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module JavaScript.Event (
EventTarget, IsEventTarget(..),
Event, IsEvent(..),
asEventListener,
addEventListener,
) where
import JavaScript.Val
newtype EventTarget = EventTarget JSVal
deriving (ToJSVal, FromJSVal)
class IsEventTarget a where
toEventTarget :: a -> EventTarget
instance IsEventTarget EventTarget where
toEventTarget = id
newtype Event = Event JSVal
deriving (ToJSVal, FromJSVal)
class IsEvent a where
toEvent :: a -> Event
instance IsEvent Event where
toEvent = id
foreign import javascript "wrapper"
asEventListener :: (JSVal -> IO ()) -> IO JSVal
addEventListener :: IsEventTarget a => a -> String -> (Event -> IO ()) -> IO ()
addEventListener target ev cb = do
js_addEventListener (toJSVal $ toEventTarget target) (toJSString ev) =<< asEventListener (cb . fromJSValUnchecked)
foreign import javascript unsafe "$1.addEventListener($2, $3)"
js_addEventListener :: JSVal -> JSString -> JSVal -> IO ()
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