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https://github.com/jtdaugherty/brick.git
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86 lines
2.8 KiB
Haskell
86 lines
2.8 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Main where
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#if !MIN_VERSION_base(4,8,0)
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import Control.Applicative
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#endif
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import Control.Monad (void)
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import Data.Monoid ((<>))
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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 qualified Brick.Main as M
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import qualified Brick.Widgets.Center as C
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import qualified Brick.Widgets.Border as B
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import Brick.Types
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( Widget
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, ViewportType(Horizontal, Vertical, Both)
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)
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import Brick.AttrMap
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( attrMap
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)
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import Brick.Widgets.Core
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( hLimit
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, vLimit
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, hBox
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, vBox
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, viewport
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, str
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)
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data Name = VP1
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| VP2
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| VP3
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deriving (Ord, Show, Eq)
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drawUi :: () -> [Widget Name]
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drawUi = const [ui]
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where
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ui = C.center $ B.border $ hLimit 60 $ vLimit 21 $
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vBox [ pair, B.hBorder, singleton ]
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singleton = viewport VP3 Both $
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vBox $ str "Press ctrl-arrow keys to scroll this viewport horizontally and vertically."
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: (str <$> [ "Line " <> show i | i <- [2..25::Int] ])
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pair = hBox [ viewport VP1 Vertical $
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vBox $ str "Press up and down arrow keys" :
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str "to scroll this viewport." :
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(str <$> [ "Line " <> (show i) | i <- [3..50::Int] ])
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, B.vBorder
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, viewport VP2 Horizontal $
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str "Press left and right arrow keys to scroll this viewport."
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]
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vp1Scroll :: M.ViewportScroll Name
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vp1Scroll = M.viewportScroll VP1
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vp2Scroll :: M.ViewportScroll Name
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vp2Scroll = M.viewportScroll VP2
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vp3Scroll :: M.ViewportScroll Name
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vp3Scroll = M.viewportScroll VP3
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appEvent :: () -> T.BrickEvent Name e -> T.EventM Name (T.Next ())
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appEvent _ (T.VtyEvent (V.EvKey V.KDown [V.MCtrl])) = M.vScrollBy vp3Scroll 1 >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KUp [V.MCtrl])) = M.vScrollBy vp3Scroll (-1) >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KRight [V.MCtrl])) = M.hScrollBy vp3Scroll 1 >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KLeft [V.MCtrl])) = M.hScrollBy vp3Scroll (-1) >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KDown [])) = M.vScrollBy vp1Scroll 1 >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KUp [])) = M.vScrollBy vp1Scroll (-1) >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KRight [])) = M.hScrollBy vp2Scroll 1 >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KLeft [])) = M.hScrollBy vp2Scroll (-1) >> M.continue ()
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appEvent _ (T.VtyEvent (V.EvKey V.KEsc [])) = M.halt ()
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appEvent _ _ = M.continue ()
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app :: M.App () 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 []
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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 ()
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