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69 lines
2.1 KiB
Haskell
69 lines
2.1 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 (rowL, columnL, 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 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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[ 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 -> V.Event -> T.EventM (T.Next St)
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appEvent st (V.EvKey V.KDown []) = M.continue $ st & topLayerLocation.rowL %~ (+ 1)
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appEvent st (V.EvKey V.KUp []) = M.continue $ st & topLayerLocation.rowL %~ (subtract 1)
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appEvent st (V.EvKey V.KRight []) = M.continue $ st & topLayerLocation.columnL %~ (+ 1)
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appEvent st (V.EvKey V.KLeft []) = M.continue $ st & topLayerLocation.columnL %~ (subtract 1)
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appEvent st (V.EvKey V.KDown [V.MCtrl]) = M.continue $ st & bottomLayerLocation.rowL %~ (+ 1)
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appEvent st (V.EvKey V.KUp [V.MCtrl]) = M.continue $ st & bottomLayerLocation.rowL %~ (subtract 1)
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appEvent st (V.EvKey V.KRight [V.MCtrl]) = M.continue $ st & bottomLayerLocation.columnL %~ (+ 1)
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appEvent st (V.EvKey V.KLeft [V.MCtrl]) = M.continue $ st & bottomLayerLocation.columnL %~ (subtract 1)
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appEvent st (V.EvKey V.KEsc []) = M.halt st
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appEvent st _ = M.continue st
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app :: M.App St V.Event
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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.appLiftVtyEvent = id
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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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