brick/programs/DialogDemo.hs

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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE CPP #-}
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module Main where
#if !(MIN_VERSION_base(4,11,0))
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import Data.Monoid
#endif
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import qualified Graphics.Vty as V
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import qualified Brick.Main as M
import Brick.Types
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( Widget
, BrickEvent(..)
)
import Brick.Widgets.Core
( padAll
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, str
)
import qualified Brick.Widgets.Dialog as D
import qualified Brick.Widgets.Center as C
import qualified Brick.AttrMap as A
import Brick.Util (on, bg)
import qualified Brick.Types as T
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data Choice = Red | Blue | Green
deriving Show
drawUI :: D.Dialog Choice -> [Widget ()]
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drawUI d = [ui]
where
ui = D.renderDialog d $ C.hCenter $ padAll 1 $ str "This is the dialog body."
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appEvent :: BrickEvent () e -> T.EventM () (D.Dialog Choice) ()
appEvent (VtyEvent ev) =
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case ev of
V.EvKey V.KEsc [] -> M.halt
V.EvKey V.KEnter [] -> M.halt
_ -> D.handleDialogEvent ev
appEvent _ = return ()
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initialState :: D.Dialog Choice
initialState = D.dialog (Just "Title") (Just (0, choices)) 50
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where
choices = [ ("Red", Red)
, ("Blue", Blue)
, ("Green", Green)
]
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theMap :: A.AttrMap
theMap = A.attrMap V.defAttr
[ (D.dialogAttr, V.white `on` V.blue)
, (D.buttonAttr, V.black `on` V.white)
, (D.buttonSelectedAttr, bg V.yellow)
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]
theApp :: M.App (D.Dialog Choice) e ()
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theApp =
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M.App { M.appDraw = drawUI
, M.appChooseCursor = M.showFirstCursor
, M.appHandleEvent = appEvent
, M.appStartEvent = return ()
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, M.appAttrMap = const theMap
}
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main :: IO ()
main = do
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d <- M.defaultMain theApp initialState
putStrLn $ "You chose: " <> show (D.dialogSelection d)