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79 lines
1.7 KiB
Haskell
79 lines
1.7 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, forever)
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import Control.Concurrent (newChan, writeChan, threadDelay, forkIO)
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import Data.Default
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import Data.Monoid
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import qualified Graphics.Vty as V
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import Brick.Main
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( App(..)
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, showFirstCursor
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, customMain
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, continue
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, halt
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)
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import Brick.Types
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( Widget
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, Next
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, EventM
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)
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import Brick.Widgets.Core
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( (<=>)
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, str
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)
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data St =
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St { _stLastVtyEvent :: Maybe V.Event
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, _stCounter :: Int
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}
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makeLenses ''St
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data CustomEvent = VtyEvent V.Event
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| Counter
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drawUI :: St -> [Widget ()]
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drawUI st = [a]
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where
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a = (str $ "Last Vty event: " <> (show $ st^.stLastVtyEvent))
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<=>
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(str $ "Counter value is: " <> (show $ st^.stCounter))
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appEvent :: St -> CustomEvent -> EventM () (Next St)
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appEvent st e =
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case e of
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VtyEvent (V.EvKey V.KEsc []) -> halt st
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VtyEvent ev -> continue $ st & stLastVtyEvent .~ (Just ev)
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Counter -> continue $ st & stCounter %~ (+1)
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initialState :: St
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initialState =
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St { _stLastVtyEvent = Nothing
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, _stCounter = 0
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}
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theApp :: App St CustomEvent ()
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theApp =
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App { appDraw = drawUI
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, appChooseCursor = showFirstCursor
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, appHandleEvent = appEvent
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, appStartEvent = return
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, appAttrMap = def
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, appLiftVtyEvent = VtyEvent
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}
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main :: IO ()
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main = do
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chan <- newChan
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forkIO $ forever $ do
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writeChan chan Counter
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threadDelay 1000000
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void $ customMain (V.mkVty def) chan theApp initialState
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