mirror of
https://github.com/jtdaugherty/brick.git
synced 2024-12-12 12:23:21 +03:00
be47eb2a2b
This might improve the understanding of what is a list item and what is a position. Also in when running the demo it was possible to create identical items by removing an element form the middle and adding a new one (wich got the number (length of list), not (smallest unused element in list)).
100 lines
2.9 KiB
Haskell
100 lines
2.9 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
|
|
module Main where
|
|
|
|
import Control.Lens ((^.))
|
|
import Control.Monad (void)
|
|
import Data.Monoid
|
|
import Data.Maybe (fromMaybe)
|
|
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.AttrMap as A
|
|
import qualified Data.Vector as V
|
|
import Brick.Types
|
|
( Widget
|
|
)
|
|
import Brick.Widgets.Core
|
|
( (<+>)
|
|
, str
|
|
, vLimit
|
|
, hLimit
|
|
, vBox
|
|
, withAttr
|
|
)
|
|
import Brick.Util (fg, on)
|
|
|
|
drawUI :: (Show a) => L.List a -> [Widget]
|
|
drawUI l = [ui]
|
|
where
|
|
label = str "Item " <+> cur <+> str " of " <+> total
|
|
cur = case l^.(L.listSelectedL) of
|
|
Nothing -> str "-"
|
|
Just i -> str (show (i + 1))
|
|
total = str $ show $ V.length $ l^.(L.listElementsL)
|
|
box = B.borderWithLabel label $
|
|
hLimit 25 $
|
|
vLimit 15 $
|
|
L.renderList l listDrawElement
|
|
ui = C.vCenter $ vBox [ C.hCenter box
|
|
, str " "
|
|
, C.hCenter $ str "Press +/- to add/remove list elements."
|
|
, C.hCenter $ str "Press Esc to exit."
|
|
]
|
|
|
|
appEvent :: L.List Char -> V.Event -> T.EventM (T.Next (L.List Char))
|
|
appEvent l e =
|
|
case e of
|
|
V.EvKey (V.KChar '+') [] ->
|
|
let el = nextElement (L.listElements l)
|
|
pos = V.length $ l^.(L.listElementsL)
|
|
in M.continue $ L.listInsert pos el l
|
|
|
|
V.EvKey (V.KChar '-') [] ->
|
|
case l^.(L.listSelectedL) of
|
|
Nothing -> M.continue l
|
|
Just i -> M.continue $ L.listRemove i l
|
|
|
|
V.EvKey V.KEsc [] -> M.halt l
|
|
|
|
ev -> M.continue =<< T.handleEvent ev l
|
|
where
|
|
nextElement :: V.Vector Char -> Char
|
|
nextElement v = fromMaybe '?' $ V.find (flip V.notElem v) (V.fromList ['a' .. 'z'])
|
|
|
|
listDrawElement :: (Show a) => Bool -> a -> Widget
|
|
listDrawElement sel a =
|
|
let selStr s = if sel
|
|
then withAttr customAttr (str $ "<" <> s <> ">")
|
|
else str s
|
|
in C.hCenter $ str "Item " <+> (selStr $ show a)
|
|
|
|
initialState :: L.List Char
|
|
initialState = L.list (T.Name "list") (V.fromList ['a','b','c']) 1
|
|
|
|
customAttr :: A.AttrName
|
|
customAttr = L.listSelectedAttr <> "custom"
|
|
|
|
theMap :: A.AttrMap
|
|
theMap = A.attrMap V.defAttr
|
|
[ (L.listAttr, V.white `on` V.blue)
|
|
, (L.listSelectedAttr, V.blue `on` V.white)
|
|
, (customAttr, fg V.cyan)
|
|
]
|
|
|
|
theApp :: M.App (L.List Char) V.Event
|
|
theApp =
|
|
M.App { M.appDraw = drawUI
|
|
, M.appChooseCursor = M.showFirstCursor
|
|
, M.appHandleEvent = appEvent
|
|
, M.appStartEvent = return
|
|
, M.appAttrMap = const theMap
|
|
, M.appLiftVtyEvent = id
|
|
}
|
|
|
|
main :: IO ()
|
|
main = void $ M.defaultMain theApp initialState
|