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module Util.Reflex
( visibleIfDyn
, visibleIfEvent
, divVisibleIf
, divClassVisibleIf
, flatten
, getBody
) where
import qualified Data.Map as M
import Data.Text (Text)
import qualified GHCJS.DOM as Dom
import qualified GHCJS.DOM.Document as Document
import qualified GHCJS.DOM.HTMLCollection as HTMLCollection
import GHCJS.DOM.Types (Element)
import Reflex.Dom (Dynamic, Event, MonadWidget)
import qualified Reflex.Dom as R
visibleIfDyn :: forall t m a. MonadWidget t m => Dynamic t Bool -> m a -> m a -> m (Event t a)
visibleIfDyn cond empty content =
R.dyn $ R.ffor cond $ \case
True -> content
False -> empty
visibleIfEvent :: forall t m a. MonadWidget t m => Event t Bool -> m a -> m a -> m (Dynamic t a)
visibleIfEvent cond empty content =
R.widgetHold empty $
R.ffor cond $ \case
True -> content
False -> empty
divVisibleIf :: forall t m a. MonadWidget t m => Dynamic t Bool -> m a -> m a
divVisibleIf cond content = divClassVisibleIf cond "" content
divClassVisibleIf :: forall t m a. MonadWidget t m => Dynamic t Bool -> Text -> m a -> m a
divClassVisibleIf cond className content =
R.elDynAttr
"div"
(fmap (\c -> (M.singleton "class" className) `M.union` if c then M.empty else M.singleton "style" "display:none") cond)
content
flatten :: forall t m a. MonadWidget t m => Event t (Event t a) -> m (Event t a)
flatten e = do
dyn <- R.holdDyn R.never e
return $ R.switchDyn dyn
getBody :: forall t m. MonadWidget t m => m Element
getBody = do
document <- Dom.currentDocumentUnchecked
nodelist <- Document.getElementsByTagName document ("body" :: String)
Just body <- nodelist `HTMLCollection.item` 0
return body
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