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|
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE CPP #-}
module Main where
import Control.Monad (void)
import Lens.Micro
import Lens.Micro.TH
import Lens.Micro.Mtl
#if !(MIN_VERSION_base(4,11,0))
import Data.Monoid
#endif
import qualified Graphics.Vty as V
import qualified Brick.Types as T
import qualified Brick.Main as M
import qualified Brick.Widgets.Center as C
import qualified Brick.Widgets.Border as B
import Brick.AttrMap (AttrMap, AttrName, attrMap, attrName)
import Brick.Util (on)
import Brick.Types
( Widget
, ViewportType(Horizontal, Vertical, Both)
)
import Brick.Widgets.Core
( withAttr
, hLimit
, vLimit
, hBox
, vBox
, viewport
, str
, visible
)
data St =
St { _vp1Index :: Int
, _vp2Index :: Int
, _vp3Index :: (Int, Int)
}
makeLenses ''St
data Name = VP1
| VP2
| VP3
deriving (Show, Ord, Eq)
vp1Size :: Int
vp1Size = 15
vp2Size :: Int
vp2Size = 15
vp3Size :: (Int, Int)
vp3Size = (25, 25)
selectedAttr :: AttrName
selectedAttr = attrName "selected"
drawUi :: St -> [Widget Name]
drawUi st = [ui]
where
ui = C.center $ hLimit 60 $ vLimit 30 $
vBox [ B.border $ vBox [ pair, B.hBorder, singleton ]
, str $ "- Up/down arrow keys scroll the top-left viewport\n" <>
"- Left/right arrow keys scroll the top-right viewport\n" <>
"- Ctrl-arrow keys move the bottom viewport"
]
singleton = viewport VP3 Both $
vBox $ do
i <- [1..vp3Size^._1]
let row = do
j <- [1..vp3Size^._2]
let mkItem = if (i, j) == st^.vp3Index
then withAttr selectedAttr . visible
else id
return $ mkItem $ str $ "Item " <> show (i, j) <> " "
return $ hBox row
pair = hBox [ vp1, B.vBorder, vp2 ]
vp1 = viewport VP1 Vertical $
vBox $ do
i <- [1..vp1Size]
let mkItem = if i == st^.vp1Index
then withAttr selectedAttr . visible
else id
return $ mkItem $ str $ "Item " <> show i
vp2 = viewport VP2 Horizontal $
hBox $ do
i <- [1..vp2Size]
let mkItem = if i == st^.vp2Index
then withAttr selectedAttr . visible
else id
return $ mkItem $ str $ "Item " <> show i <> " "
vp1Scroll :: M.ViewportScroll Name
vp1Scroll = M.viewportScroll VP1
vp2Scroll :: M.ViewportScroll Name
vp2Scroll = M.viewportScroll VP2
vp3Scroll :: M.ViewportScroll Name
vp3Scroll = M.viewportScroll VP3
appEvent :: T.BrickEvent Name e -> T.EventM Name St ()
appEvent (T.VtyEvent (V.EvKey V.KDown [V.MCtrl])) = vp3Index._1 %= min (vp3Size^._1) . (+ 1)
appEvent (T.VtyEvent (V.EvKey V.KUp [V.MCtrl])) = vp3Index._1 %= max 1 . subtract 1
appEvent (T.VtyEvent (V.EvKey V.KRight [V.MCtrl])) = vp3Index._2 %= min (vp3Size^._1) . (+ 1)
appEvent (T.VtyEvent (V.EvKey V.KLeft [V.MCtrl])) = vp3Index._2 %= max 1 . subtract 1
appEvent (T.VtyEvent (V.EvKey V.KDown [])) = vp1Index %= min vp1Size . (+ 1)
appEvent (T.VtyEvent (V.EvKey V.KUp [])) = vp1Index %= max 1 . subtract 1
appEvent (T.VtyEvent (V.EvKey V.KRight [])) = vp2Index %= min vp2Size . (+ 1)
appEvent (T.VtyEvent (V.EvKey V.KLeft [])) = vp2Index %= max 1 . subtract 1
appEvent (T.VtyEvent (V.EvKey V.KEsc [])) = M.halt
appEvent _ = return ()
theMap :: AttrMap
theMap = attrMap V.defAttr
[ (selectedAttr, V.black `on` V.yellow)
]
app :: M.App St e Name
app =
M.App { M.appDraw = drawUi
, M.appStartEvent = return ()
, M.appHandleEvent = appEvent
, M.appAttrMap = const theMap
, M.appChooseCursor = M.neverShowCursor
}
initialState :: St
initialState = St 1 1 (1, 1)
main :: IO ()
main = void $ M.defaultMain app initialState
|
