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https://github.com/jtdaugherty/brick.git
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109 lines
3.0 KiB
Haskell
109 lines
3.0 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE TemplateHaskell #-}
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module Main where
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#if !(MIN_VERSION_base(4,11,0))
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import Data.Monoid ((<>))
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#endif
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import Lens.Micro ((^.))
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import Lens.Micro.TH (makeLenses)
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import Lens.Micro.Mtl
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import Control.Monad (void)
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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, Location(..), 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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, relativeTo
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, reportExtent
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, withDefAttr
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)
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import Brick.Util (fg)
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import Brick.AttrMap
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( attrMap
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, AttrName
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, attrName
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)
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data St =
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St { _middleLayerLocation :: T.Location
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, _bottomLayerLocation :: T.Location
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}
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makeLenses ''St
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data Name =
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MiddleLayerElement
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deriving (Ord, Eq, Show)
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drawUi :: St -> [Widget Name]
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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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, arrowLayer
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, middleLayer st
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, bottomLayer st
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]
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arrowLayer :: Widget Name
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arrowLayer =
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let msg = "Relatively\n" <>
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"positioned\n" <>
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"arrow---->"
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in relativeTo MiddleLayerElement (Location (-10, -2)) $
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withDefAttr arrowAttr $
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str msg
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middleLayer :: St -> Widget Name
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middleLayer st =
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translateBy (st^.middleLayerLocation) $
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reportExtent MiddleLayerElement $
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B.border $ str "Middle layer\n(Arrow keys move)"
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bottomLayer :: St -> Widget Name
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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 :: T.BrickEvent Name e -> T.EventM Name St ()
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appEvent (T.VtyEvent (V.EvKey V.KDown [])) =
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middleLayerLocation.locationRowL %= (+ 1)
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appEvent (T.VtyEvent (V.EvKey V.KUp [])) =
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middleLayerLocation.locationRowL %= (subtract 1)
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appEvent (T.VtyEvent (V.EvKey V.KRight [])) =
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middleLayerLocation.locationColumnL %= (+ 1)
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appEvent (T.VtyEvent (V.EvKey V.KLeft [])) =
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middleLayerLocation.locationColumnL %= (subtract 1)
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appEvent (T.VtyEvent (V.EvKey V.KDown [V.MCtrl])) =
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bottomLayerLocation.locationRowL %= (+ 1)
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appEvent (T.VtyEvent (V.EvKey V.KUp [V.MCtrl])) =
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bottomLayerLocation.locationRowL %= (subtract 1)
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appEvent (T.VtyEvent (V.EvKey V.KRight [V.MCtrl])) =
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bottomLayerLocation.locationColumnL %= (+ 1)
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appEvent (T.VtyEvent (V.EvKey V.KLeft [V.MCtrl])) =
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bottomLayerLocation.locationColumnL %= (subtract 1)
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appEvent (T.VtyEvent (V.EvKey V.KEsc [])) = M.halt
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appEvent _ = return ()
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arrowAttr :: AttrName
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arrowAttr = attrName "attr"
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app :: M.App St e Name
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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 $ attrMap V.defAttr [(arrowAttr, fg V.cyan)]
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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 (20, 5)) (T.Location (0, 0))
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