mirror of
https://github.com/jtdaugherty/brick.git
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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 #-}
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module Main where
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import Control.Lens ((^.))
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import Control.Monad (void)
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import Data.Monoid
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import Data.Maybe (fromMaybe)
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import qualified Graphics.Vty as V
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import qualified Brick.Main as M
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import qualified Brick.Types as T
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import qualified Brick.Widgets.Border as B
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import qualified Brick.Widgets.List as L
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import qualified Brick.Widgets.Center as C
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import qualified Brick.AttrMap as A
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import qualified Data.Vector as V
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import Brick.Types
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( Widget
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)
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import Brick.Widgets.Core
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( (<+>)
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, str
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, vLimit
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, hLimit
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, vBox
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, withAttr
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)
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import Brick.Util (fg, on)
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drawUI :: (Show a) => L.List a -> [Widget]
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drawUI l = [ui]
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where
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label = str "Item " <+> cur <+> str " of " <+> total
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cur = case l^.(L.listSelectedL) of
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Nothing -> str "-"
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Just i -> str (show (i + 1))
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total = str $ show $ V.length $ l^.(L.listElementsL)
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box = B.borderWithLabel label $
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hLimit 25 $
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vLimit 15 $
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L.renderList l listDrawElement
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ui = C.vCenter $ vBox [ C.hCenter box
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, str " "
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, C.hCenter $ str "Press +/- to add/remove list elements."
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, C.hCenter $ str "Press Esc to exit."
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]
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appEvent :: L.List Char -> V.Event -> T.EventM (T.Next (L.List Char))
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appEvent l e =
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case e of
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V.EvKey (V.KChar '+') [] ->
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let el = nextElement (L.listElements l)
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pos = V.length $ l^.(L.listElementsL)
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in M.continue $ L.listInsert pos el l
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V.EvKey (V.KChar '-') [] ->
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case l^.(L.listSelectedL) of
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Nothing -> M.continue l
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Just i -> M.continue $ L.listRemove i l
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V.EvKey V.KEsc [] -> M.halt l
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ev -> M.continue =<< T.handleEvent ev l
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where
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nextElement :: V.Vector Char -> Char
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nextElement v = fromMaybe '?' $ V.find (flip V.notElem v) (V.fromList ['a' .. 'z'])
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listDrawElement :: (Show a) => Bool -> a -> Widget
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listDrawElement sel a =
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let selStr s = if sel
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then withAttr customAttr (str $ "<" <> s <> ">")
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else str s
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in C.hCenter $ str "Item " <+> (selStr $ show a)
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initialState :: L.List Char
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initialState = L.list (T.Name "list") (V.fromList ['a','b','c']) 1
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customAttr :: A.AttrName
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customAttr = L.listSelectedAttr <> "custom"
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theMap :: A.AttrMap
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theMap = A.attrMap V.defAttr
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[ (L.listAttr, V.white `on` V.blue)
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, (L.listSelectedAttr, V.blue `on` V.white)
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, (customAttr, fg V.cyan)
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]
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theApp :: M.App (L.List Char) V.Event
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theApp =
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M.App { M.appDraw = drawUI
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, M.appChooseCursor = M.showFirstCursor
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, M.appHandleEvent = appEvent
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, M.appStartEvent = return
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, M.appAttrMap = const theMap
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, M.appLiftVtyEvent = id
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}
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main :: IO ()
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main = void $ M.defaultMain theApp initialState
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