From 0b40b6b5583b5c437f83e61bf8913f2b4c447b24 Mon Sep 17 00:00:00 2001
From: Joris
Date: Sat, 19 Oct 2019 09:36:03 +0200
Subject: Include pages into table component

---
 client/src/Component/Pages.hs | 88 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 client/src/Component/Pages.hs

(limited to 'client/src/Component/Pages.hs')

diff --git a/client/src/Component/Pages.hs b/client/src/Component/Pages.hs
new file mode 100644
index 0000000..5611cb7
--- /dev/null
+++ b/client/src/Component/Pages.hs
@@ -0,0 +1,88 @@
+module Component.Pages
+  ( widget
+  , PagesIn(..)
+  , PagesOut(..)
+  ) where
+
+import qualified Data.Text        as T
+import           Reflex.Dom       (Dynamic, Event, MonadWidget)
+import qualified Reflex.Dom       as R
+
+import           Component.Button (ButtonIn (..), ButtonOut (..))
+import qualified Component.Button as Button
+
+import qualified Icon
+import qualified Util.Reflex      as ReflexUtil
+
+data PagesIn t = PagesIn
+  { _pagesIn_total   :: Dynamic t Int
+  , _pagesIn_perPage :: Int
+  , _pagesIn_reset   :: Event t ()
+  }
+
+data PagesOut t = PagesOut
+  { _pagesOut_currentPage :: Dynamic t Int
+  }
+
+widget :: forall t m. MonadWidget t m => PagesIn t -> m (PagesOut t)
+widget pagesIn = do
+  currentPage <- ReflexUtil.divVisibleIf ((> 0) <$> total) $ pageButtons total perPage reset
+
+  return $ PagesOut
+    { _pagesOut_currentPage = currentPage
+    }
+
+  where
+    total = _pagesIn_total pagesIn
+    perPage = _pagesIn_perPage pagesIn
+    reset = _pagesIn_reset pagesIn
+
+pageButtons :: forall t m. MonadWidget t m => Dynamic t Int -> Int -> Event t () -> m (Dynamic t Int)
+pageButtons total perPage reset = do
+  R.divClass "pages" $ do
+    rec
+      currentPage <- R.holdDyn 1 . R.leftmost $
+        [ firstPageClic
+        , previousPageClic
+        , pageClic
+        , nextPageClic
+        , lastPageClic
+        , 1 <$ reset
+        ]
+
+      firstPageClic <- pageButton noCurrentPage (R.constDyn 1) Icon.doubleLeftBar
+
+      previousPageClic <- pageButton noCurrentPage (fmap (\x -> max (x - 1) 1) currentPage) Icon.doubleLeft
+
+      pageClic <- pageEvent <$> (R.simpleList (range <$> currentPage <*> maxPage) $ \p ->
+        pageButton (Just <$> currentPage) p (R.dynText $ fmap (T.pack . show) p))
+
+      nextPageClic <- pageButton noCurrentPage ((\c m -> min (c + 1) m) <$> currentPage <*> maxPage) Icon.doubleRight
+
+      lastPageClic <- pageButton noCurrentPage maxPage Icon.doubleRightBar
+
+    return currentPage
+
+    where maxPage = R.ffor total (\t -> ceiling $ toRational t / toRational perPage)
+          pageEvent = R.switch . R.current . fmap R.leftmost
+          noCurrentPage = R.constDyn Nothing
+
+range :: Int -> Int -> [Int]
+range currentPage maxPage = [start..end]
+  where sidePages = 2
+        start = max 1 (min (currentPage - sidePages) (maxPage - sidePages * 2))
+        end = min maxPage (start + sidePages * 2)
+
+pageButton :: forall t m. MonadWidget t m => Dynamic t (Maybe Int) -> Dynamic t Int -> m () -> m (Event t Int)
+pageButton currentPage page content = do
+  clic <- _buttonOut_clic <$> (Button.button $ ButtonIn
+    { _buttonIn_class   = do
+        cp <- currentPage
+        p <- page
+        if cp == Just p then "page current" else "page"
+    , _buttonIn_content = content
+    , _buttonIn_waiting = R.never
+    , _buttonIn_tabIndex = Nothing
+    , _buttonIn_submit = False
+    })
+  return . fmap fst $ R.attach (R.current page) clic
-- 
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