244 lines
8.1 KiB
Plaintext
244 lines
8.1 KiB
Plaintext
module Aviary.UI where
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import Prelude
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import Aviary.Logic (fetchFull, fetchThumb)
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import Aviary.Model ( GalleryError(..)
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, Image
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, ImageData(..)
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, Model(..)
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)
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import Control.Parallel (parSequence_)
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import Data.Array (index, length, mapWithIndex, modifyAt)
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import Data.Maybe (fromMaybe, maybe, Maybe(..))
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import Effect.Aff (Aff)
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import Halogen as H
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import Halogen.HTML as HH
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import Halogen.HTML.Events as HE
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import Halogen.HTML.Properties as HP
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import Halogen.Query.Event (eventListener)
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import Web.HTML (window) as Web
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import Web.HTML.Common (ClassName(..))
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import Web.HTML.HTMLDocument as HTMLDocument
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import Web.HTML.Window (document) as Web
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import Web.UIEvent.KeyboardEvent as KE
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import Web.UIEvent.KeyboardEvent.EventTypes as KET
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data Event = LoadThumbs
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| ThumbLoaded Int ImageData
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| FullLoaded Int ImageData
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| Focus Int
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| Unfocus
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| Zoom
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| Unzoom
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| Pan Boolean -- True if right
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| DownloadFocused
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| Init
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| RegisterListeners
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component :: forall query input. Model -> H.Component query input Event Aff
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component initialState = H.mkComponent
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{ initialState: \_ -> initialState
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, render
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, eval: H.mkEval $ H.defaultEval { handleAction = update, initialize = Just Init }
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}
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backgroundUrl :: String -> String
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backgroundUrl url = "background-image: url(" <> url <> ");"
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widthHeight :: Int -> Int -> String
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widthHeight w h = "width:" <> (show w) <> "px;height:" <> (show h) <> "px;"
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renderThumbnail :: forall m. Int -> Image -> H.ComponentHTML Event () m
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renderThumbnail pos image =
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HH.button
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(
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[ HP.classes $ ClassName <$> ["thumbnail-card", "blurhash-frame", "control"]
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, HE.onClick \_ -> Focus pos
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]
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<>
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maybe [] (backgroundUrl >>> HP.style >>> pure) (image.blurhashUrl)
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)
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case image.thumb of
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Unloaded _ ->
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[ HH.span
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[ HP.class_ $ ClassName "loading-msg"
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]
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[ HH.text "Loading..."
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]
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]
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IError e ->
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[ HH.span
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[ HP.class_ $ ClassName "error-msg"
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]
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[ HH.text $ "Error! " <> (show e)
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]
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]
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ILoaded url ->
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[ HH.img [HP.src url]
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]
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renderFocused :: forall m. Boolean -> Image -> H.ComponentHTML Event () m
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renderFocused zoom image =
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HH.div
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[ HP.id "focused-panel"
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, HP.class_ $ ClassName if zoom then "zoomed" else "unzoomed"
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]
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[ HH.div
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[ HP.id "focused-bg"
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, HE.onClick \_ -> Unfocus
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]
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[ HH.button
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[ HP.id "close"
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, HP.class_ $ ClassName "control"
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]
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[ HH.text "⨯"
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]
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]
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, HH.button
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[ HP.id "prev-image"
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, HP.class_ $ ClassName "control"
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, HE.onClick \_ -> Pan false
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]
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[ HH.text "❰"
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]
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, HH.button
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[ HP.id "next-image"
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, HP.class_ $ ClassName "control"
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, HE.onClick \_ -> Pan true
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]
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[ HH.text "❱"
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]
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, HH.div
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[ HP.style
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case image.full of
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ILoaded _ -> ""
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_ ->
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( maybe "" backgroundUrl (image.blurhashUrl)
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<> widthHeight image.width image.height
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)
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, HP.class_ $ ClassName "blurhash-frame"
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]
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case image.full of
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Unloaded _ ->
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[ HH.span
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[ HP.class_ $ ClassName "loading-msg"
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]
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[ HH.text "Loading..."
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]
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]
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IError e ->
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[ HH.span
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[ HP.class_ $ ClassName "error-msg"
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]
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[ HH.text $ "Error! " <> (show e)
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]
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]
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ILoaded url ->
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[ HH.img
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[ HP.src url
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, HE.onClick \_ -> if zoom then Unzoom else Zoom
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]
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]
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]
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setImage :: (Image -> Image) -> Int -> Model -> Model
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setImage _ _ (GError e) = (GError e)
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setImage tranformation pos (GLoaded gallery) =
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case modifyAt pos tranformation gallery.images of
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Just newImages -> GLoaded gallery{images = newImages}
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Nothing -> GError $ UnexpectedError "setImage called with an out of bounds index!"
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setThumb :: ImageData -> Int -> Model -> Model
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setThumb newThumb = setImage \i -> i{thumb = newThumb}
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setFull :: ImageData -> Int -> Model -> Model
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setFull newImage = setImage \i -> i{full = newImage}
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fetchThumbAction :: Int -> Image -> H.HalogenM Model Event () Event Aff Unit
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fetchThumbAction position image = do
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newData <- H.liftAff $ fetchThumb image
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update $ ThumbLoaded position newData
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fetchFullAction :: Int -> Image -> H.HalogenM Model Event () Event Aff Unit
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fetchFullAction position image = do
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newData <- H.liftAff $ fetchFull image
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update $ FullLoaded position newData
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eventByKey :: KE.KeyboardEvent -> Maybe Event
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eventByKey ev = case KE.key ev of
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"ArrowLeft" -> Just $ Pan false
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"ArrowRight" -> Just $ Pan true
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"Escape" -> Just $ Unfocus
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"1" -> Just $ Focus 0
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_ -> Nothing
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update :: Event -> H.HalogenM Model Event () Event Aff Unit
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update Init = update RegisterListeners <> update LoadThumbs
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update RegisterListeners = do
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document <- H.liftEffect $ Web.document =<< Web.window
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H.subscribe' \_ ->
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eventListener
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KET.keydown
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(HTMLDocument.toEventTarget document)
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(KE.fromEvent >>> (=<<) eventByKey)
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update LoadThumbs = do
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model <- H.get
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case model of
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GError _ -> pure unit
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GLoaded {images} -> parSequence_ $ mapWithIndex fetchThumbAction images
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update (ThumbLoaded pos newData) = H.modify_ $ setThumb newData pos
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update (FullLoaded pos newData) = H.modify_ $ setFull newData pos
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update (Focus imageIndex) = do
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_ <- H.modify_ \model -> case model of
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GError e -> GError e
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GLoaded gal -> GLoaded gal{ focus = Just { imageIndex, zoom: false } }
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update DownloadFocused
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update Unfocus = H.modify_ \model -> case model of
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GError e -> GError e
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GLoaded gal -> GLoaded gal { focus = Nothing }
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update Zoom = H.modify_ \model -> case model of
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GError e -> GError e
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GLoaded gal -> GLoaded gal { focus = gal.focus <#> _{ zoom = true } }
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update Unzoom = H.modify_ \model -> case model of
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GError e -> GError e
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GLoaded gal -> GLoaded gal { focus = gal.focus <#> _{ zoom = false } }
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update (Pan right) = do
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_ <- H.modify_ \model -> case model of
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GError e -> GError e
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GLoaded gal -> GLoaded gal
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{ focus = gal.focus <#> \foc ->
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foc{ imageIndex =
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mod (foc.imageIndex + (if right then 1 else -1)) (length gal.images)
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}
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}
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update DownloadFocused
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update DownloadFocused = do
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model <- H.get
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case model of
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GLoaded {images, focus: Just {imageIndex}} ->
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let focusedImage = index images imageIndex
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in case focusedImage of
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Just focusedImage' -> fetchFullAction imageIndex focusedImage'
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Nothing ->
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H.put $ GError $ UnexpectedError "Focus event raised with an out of bounds index!"
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_ -> pure unit
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render :: forall m. Model -> H.ComponentHTML Event () m
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render (GError e) = HH.div
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[ HP.class_ $ ClassName "uh-oh-stinky"
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]
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[ HH.p_ [ HH.text $ show e ]
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]
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render (GLoaded {title, desc, images, focus}) = HH.div_
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((maybe [] (HH.text >>> pure >>> HH.h1_ >>> pure) title) <>
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(maybe [] (HH.text >>> pure >>> HH.p_ >>> pure) desc) <>
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[ HH.div
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[ HP.id "thumbnails"
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]
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(mapWithIndex renderThumbnail images)
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] <>
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(maybe [] (renderFocused (fromMaybe false (_.zoom <$> focus)) >>> pure) (index images =<< (_.imageIndex <$> focus))))
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