mirror of
https://github.com/jtdaugherty/brick.git
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137 lines
4.2 KiB
Haskell
137 lines
4.2 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TemplateHaskell #-}
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module Main where
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import Control.Monad (void)
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import Control.Lens
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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.AttrMap (AttrMap, AttrName, attrMap)
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import Brick.Util (on)
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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.Widgets.Core
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( withAttr
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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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, visible
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)
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data St =
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St { _vp1Index :: Int
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, _vp2Index :: Int
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, _vp3Index :: (Int, Int)
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}
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makeLenses ''St
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vp1Name :: T.Name
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vp1Name = "demo1"
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vp1Size :: Int
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vp1Size = 15
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vp2Name :: T.Name
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vp2Name = "demo2"
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vp2Size :: Int
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vp2Size = 15
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vp3Name :: T.Name
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vp3Name = "demo3"
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vp3Size :: (Int, Int)
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vp3Size = (25, 25)
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selectedAttr :: AttrName
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selectedAttr = "selected"
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drawUi :: St -> [Widget]
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drawUi st = [ui]
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where
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ui = C.center $ hLimit 60 $ vLimit 30 $
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vBox [ B.border $ vBox [ pair, B.hBorder, singleton ]
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, str $ "- Up/down arrow keys scroll the top-left viewport\n" <>
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"- Left/right arrow keys scroll the top-right viewport\n" <>
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"- Ctrl-arrow keys move the bottom viewport"
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]
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singleton = viewport vp3Name Both $
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vBox $ do
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i <- [1..vp3Size^._1]
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let row = do
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j <- [1..vp3Size^._2]
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let mkItem = if (i, j) == st^.vp3Index
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then withAttr selectedAttr . visible
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else id
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return $ mkItem $ str $ "Item " <> show (i, j) <> " "
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return $ hBox row
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pair = hBox [ vp1, B.vBorder, vp2 ]
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vp1 = viewport vp1Name Vertical $
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vBox $ do
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i <- [1..vp1Size]
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let mkItem = if i == st^.vp1Index
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then withAttr selectedAttr . visible
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else id
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return $ mkItem $ str $ "Item " <> show i
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vp2 = viewport vp2Name Horizontal $
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hBox $ do
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i <- [1..vp2Size]
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let mkItem = if i == st^.vp2Index
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then withAttr selectedAttr . visible
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else id
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return $ mkItem $ str $ "Item " <> show i <> " "
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vp1Scroll :: M.ViewportScroll
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vp1Scroll = M.viewportScroll vp1Name
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vp2Scroll :: M.ViewportScroll
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vp2Scroll = M.viewportScroll vp2Name
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vp3Scroll :: M.ViewportScroll
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vp3Scroll = M.viewportScroll vp3Name
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appEvent :: St -> V.Event -> T.EventM (T.Next St)
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appEvent st (V.EvKey V.KDown [V.MCtrl]) = M.continue $ st & vp3Index._1 %~ min (vp3Size^._1) . (+ 1)
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appEvent st (V.EvKey V.KUp [V.MCtrl]) = M.continue $ st & vp3Index._1 %~ max 1 . subtract 1
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appEvent st (V.EvKey V.KRight [V.MCtrl]) = M.continue $ st & vp3Index._2 %~ min (vp3Size^._1) . (+ 1)
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appEvent st (V.EvKey V.KLeft [V.MCtrl]) = M.continue $ st & vp3Index._2 %~ max 1 . subtract 1
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appEvent st (V.EvKey V.KDown []) = M.continue $ st & vp1Index %~ min vp1Size . (+ 1)
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appEvent st (V.EvKey V.KUp []) = M.continue $ st & vp1Index %~ max 1 . subtract 1
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appEvent st (V.EvKey V.KRight []) = M.continue $ st & vp2Index %~ min vp2Size . (+ 1)
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appEvent st (V.EvKey V.KLeft []) = M.continue $ st & vp2Index %~ max 1 . 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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theMap :: AttrMap
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theMap = attrMap V.defAttr
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[ (selectedAttr, V.black `on` V.yellow)
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]
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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 theMap
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, M.appLiftVtyEvent = id
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, M.appChooseCursor = M.neverShowCursor
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}
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initialState :: St
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initialState = St 1 1 (1, 1)
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main :: IO ()
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main = void $ M.defaultMain app initialState
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