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https://github.com/jtdaugherty/brick.git
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79 lines
2.5 KiB
Haskell
79 lines
2.5 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TemplateHaskell #-}
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module Main where
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import Lens.Micro ((^.), (&), (%~))
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import Lens.Micro.TH (makeLenses)
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import Control.Monad (void)
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import Data.Default
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import qualified Graphics.Vty as V
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import qualified Brick.Types as T
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import Brick.Types (locationRowL, locationColumnL, Widget)
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import qualified Brick.Main as M
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import qualified Brick.Widgets.Border as B
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import qualified Brick.Widgets.Center as C
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import Brick.Widgets.Core
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( translateBy
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, str
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)
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data St =
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St { _topLayerLocation :: T.Location
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, _bottomLayerLocation :: T.Location
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}
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makeLenses ''St
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drawUi :: St -> [Widget ()]
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drawUi st =
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[ C.centerLayer $
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B.border $ str "This layer is centered but other\nlayers are placed underneath it."
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, topLayer st
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, bottomLayer st
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]
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topLayer :: St -> Widget ()
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topLayer st =
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translateBy (st^.topLayerLocation) $
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B.border $ str "Top layer\n(Arrow keys move)"
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bottomLayer :: St -> Widget ()
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bottomLayer st =
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translateBy (st^.bottomLayerLocation) $
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B.border $ str "Bottom layer\n(Ctrl-arrow keys move)"
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appEvent :: St -> T.BrickEvent () e -> T.EventM () (T.Next St)
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appEvent st (T.VtyEvent (V.EvKey V.KDown [])) =
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M.continue $ st & topLayerLocation.locationRowL %~ (+ 1)
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appEvent st (T.VtyEvent (V.EvKey V.KUp [])) =
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M.continue $ st & topLayerLocation.locationRowL %~ (subtract 1)
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appEvent st (T.VtyEvent (V.EvKey V.KRight [])) =
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M.continue $ st & topLayerLocation.locationColumnL %~ (+ 1)
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appEvent st (T.VtyEvent (V.EvKey V.KLeft [])) =
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M.continue $ st & topLayerLocation.locationColumnL %~ (subtract 1)
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appEvent st (T.VtyEvent (V.EvKey V.KDown [V.MCtrl])) =
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M.continue $ st & bottomLayerLocation.locationRowL %~ (+ 1)
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appEvent st (T.VtyEvent (V.EvKey V.KUp [V.MCtrl])) =
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M.continue $ st & bottomLayerLocation.locationRowL %~ (subtract 1)
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appEvent st (T.VtyEvent (V.EvKey V.KRight [V.MCtrl])) =
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M.continue $ st & bottomLayerLocation.locationColumnL %~ (+ 1)
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appEvent st (T.VtyEvent (V.EvKey V.KLeft [V.MCtrl])) =
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M.continue $ st & bottomLayerLocation.locationColumnL %~ (subtract 1)
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appEvent st (T.VtyEvent (V.EvKey V.KEsc [])) = M.halt st
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appEvent st _ = M.continue st
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app :: M.App St e ()
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app =
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M.App { M.appDraw = drawUi
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, M.appStartEvent = return
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, M.appHandleEvent = appEvent
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, M.appAttrMap = const def
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, M.appChooseCursor = M.neverShowCursor
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}
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main :: IO ()
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main = void $ M.defaultMain app $ St (T.Location (0, 0)) (T.Location (0, 0))
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