1 files changed, 117 insertions, 0 deletions
diff --git a/client/src/Component/Modal.hs b/client/src/Component/Modal.hs
new file mode 100644
index 0000000..46d3f64
--- /dev/null
+++ b/client/src/Component/Modal.hs
@@ -0,0 +1,117 @@
+module Component.Modal
+  ( In(..)
+  , Content
+  , view
+  ) where
+
+import           Control.Monad     (void)
+import qualified Data.Map          as M
+import qualified Data.Map.Lazy     as LM
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+import           Data.Time.Clock   (NominalDiffTime)
+import qualified GHCJS.DOM.Element as Element
+import qualified GHCJS.DOM.Node    as Node
+import           JSDOM.Types       (JSString)
+import           Reflex.Dom        (Dynamic, Event, MonadWidget)
+import qualified Reflex.Dom        as R
+import qualified Reflex.Dom.Class  as R
+
+import qualified Util.Reflex       as ReflexUtil
+
+-- Content = CurtainClickEvent -> (CancelEvent, ConfirmEvent)
+type Content t m = Event t () -> m (Event t (), Event t ())
+
+data In t m = In
+  { _in_show    :: Event t ()
+  , _in_content :: Content t m
+  }
+
+view :: forall t m a. MonadWidget t m => In t m -> m (Event t ())
+view input = do
+  rec
+    let show = Show <$ (_in_show input)
+
+        startHiding =
+          R.attachWithMaybe
+            (\a _ -> if a then Just StartHiding else Nothing)
+            (R.current canBeHidden)
+            (R.leftmost [ hide, curtainClick ])
+
+    canBeHidden <-
+      R.holdDyn True $ R.leftmost
+        [ False <$ startHiding
+        , True <$ endHiding
+        ]
+
+    endHiding <-
+      R.delay (0.2 :: NominalDiffTime) (EndHiding <$ startHiding)
+
+    let action =
+          R.leftmost [ show, startHiding, endHiding ]
+
+    modalClass <-
+      R.holdDyn "" (fmap getModalClass action)
+
+    (elem, dyn) <-
+      R.buildElement "div" (getAttributes <$> modalClass) $
+        ReflexUtil.visibleIfEvent
+          (isVisible <$> action)
+          (R.blank >> return (R.never, R.never, R.never))
+          (do
+            (curtain, _) <- R.elAttr' "div" (M.singleton "class" "g-Modal__Curtain") $ R.blank
+            let curtainClick = R.domEvent R.Click curtain
+            (hide, content) <- R.divClass "g-Modal__Content" (_in_content input curtainClick)
+            return (curtainClick, hide, content))
+
+
+    performShowEffects action elem
+
+    let curtainClick = R.switchDyn $ (\(a, _, _) -> a) <$> dyn
+    let hide = R.switchDyn $ (\(_, b, _) -> b) <$> dyn
+    let content = R.switchDyn $ (\(_, _, c) -> c) <$> dyn
+
+  -- Delay the event in order to let time for the modal to disappear
+  R.delay (0.5 :: NominalDiffTime) content
+
+getAttributes :: Text -> LM.Map Text Text
+getAttributes modalClass =
+  M.singleton "class" $
+    T.intercalate " " [ "g-Modal", modalClass]
+
+performShowEffects
+  :: forall t m a. MonadWidget t m
+  => Event t Action
+  -> Element.Element
+  -> m ()
+performShowEffects showEvent elem = do
+  body <- ReflexUtil.getBody
+
+  let showEffects =
+        flip fmap showEvent (\case
+          Show -> do
+            Node.appendChild body elem
+            Element.setClassName body ("g-Body--Modal" :: JSString)
+          StartHiding ->
+            return ()
+          EndHiding -> do
+            Node.removeChild body elem
+            Element.setClassName body ("" :: JSString)
+        )
+
+  R.performEvent_ $ void `fmap` showEffects
+
+data Action
+  = Show
+  | StartHiding
+  | EndHiding
+
+getModalClass :: Action -> Text
+getModalClass Show        = "g-Modal--Show"
+getModalClass StartHiding = "g-Modal--Hiding"
+getModalClass _           = ""
+
+isVisible :: Action -> Bool
+isVisible Show        = True
+isVisible StartHiding = True
+isVisible EndHiding   = False