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{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE CPP #-}
module Main where
import Lens.Micro ((^.))
import Lens.Micro.Mtl
import Lens.Micro.TH
import Control.Monad (void)
#if !(MIN_VERSION_base(4,11,0))
import Data.Monoid
#endif
import qualified Graphics.Vty as V
import qualified Brick.Main as M
import qualified Brick.Types as T
import qualified Brick.Widgets.Border as B
import qualified Brick.Widgets.List as L
import qualified Brick.Widgets.Center as C
import qualified Brick.Widgets.Table as Table
import qualified Brick.AttrMap as A
import qualified Data.Vector as Vec
import Brick.Types
( Widget
)
import Brick.Widgets.Core
( (<=>)
, str
, vLimit
, hLimit
, vBox
, hBox
, withDefAttr
)
import Brick.Util (on)
data Row = Row String String String
data AppState =
AppState { _tabularList :: L.List () Row
, _colIndex :: Int
}
makeLenses ''AppState
drawUI :: AppState -> [Widget ()]
drawUI s = [ui]
where
l = s^.tabularList
label = str $ "Row " <> cur <> " / col " <> show (s^.colIndex + 1)
cur = case l^.(L.listSelectedL) of
Nothing -> "-"
Just i -> show (i + 1)
box = B.borderWithLabel label $
hLimit totalWidth $
vLimit 15 $
listDrawElement 0 False headerRow <=>
L.renderList (listDrawElement (s^.colIndex)) True l
ui = C.vCenter $ vBox [ C.hCenter box
, str " "
, C.hCenter $ str "Press +/- to add/remove list elements."
, C.hCenter $ str "Use arrow keys to change selection."
, C.hCenter $ str "Press Esc to exit."
]
appEvent :: T.BrickEvent () e -> T.EventM () AppState ()
appEvent (T.VtyEvent e) =
case e of
V.EvKey (V.KChar '+') [] -> do
els <- use (tabularList.L.listElementsL)
let el = Row (show pos) (show $ pos * 3) (show $ pos * 9)
pos = Vec.length els
tabularList %= L.listInsert pos el
V.EvKey (V.KChar '-') [] -> do
sel <- use (tabularList.L.listSelectedL)
case sel of
Nothing -> return ()
Just i -> tabularList %= L.listRemove i
V.EvKey V.KLeft [] ->
colIndex %= (\i -> max 0 (i - 1))
V.EvKey V.KRight [] ->
colIndex %= (\i -> min (length columnAlignments - 1) (i + 1))
V.EvKey V.KEsc [] -> M.halt
ev -> T.zoom tabularList $ L.handleListEvent ev
appEvent _ = return ()
listDrawElement :: Int -> Bool -> Row -> Widget ()
listDrawElement colIdx sel (Row a b c) =
let ws = [str a, str b, str c]
maybeSelect es = selectCell <$> zip [0..] es
selectCell (i, w) = if sel && i == colIdx
then withDefAttr selectedCellAttr w
else w
in hLimit totalWidth $
hBox $
maybeSelect $
Table.alignColumns columnAlignments columnWidths ws
initialState :: AppState
initialState =
AppState { _tabularList = L.list () (Vec.fromList initialRows) 1
, _colIndex = 0
}
selectedCellAttr :: A.AttrName
selectedCellAttr = A.attrName "selectedCell"
theMap :: A.AttrMap
theMap = A.attrMap V.defAttr
[ (L.listAttr, V.white `on` V.blue)
, (selectedCellAttr, V.blue `on` V.white)
]
columnWidths :: [Int]
columnWidths = [10, 15, 20]
totalWidth :: Int
totalWidth = sum columnWidths
headerRow :: Row
headerRow = Row "Col 1" "Col 2" "Col 3"
columnAlignments :: [Table.ColumnAlignment]
columnAlignments = [Table.AlignLeft, Table.AlignCenter, Table.AlignRight]
initialRows :: [Row]
initialRows =
[ Row "one" "two" "three"
, Row "foo" "bar" "baz"
, Row "stuff" "things" "blah"
]
theApp :: M.App AppState e ()
theApp =
M.App { M.appDraw = drawUI
, M.appChooseCursor = M.showFirstCursor
, M.appHandleEvent = appEvent
, M.appStartEvent = return ()
, M.appAttrMap = const theMap
}
main :: IO ()
main = void $ M.defaultMain theApp initialState
|
