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88 lines
2.1 KiB
Haskell
88 lines
2.1 KiB
Haskell
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{-# LANGUAGE OverloadedStrings #-}
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module Main where
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import Control.Monad (void)
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import Graphics.Vty
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( white, blue, green, yellow, black, magenta
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, Event(EvKey)
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, Key(KChar, KEsc)
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)
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import Brick.Main
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import Brick.Themes
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( Theme
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, newTheme
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, themeToAttrMap
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)
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import Brick.Types
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( Widget
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, BrickEvent(VtyEvent)
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, EventM
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, Next
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)
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import Brick.Widgets.Center
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( hCenter
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, center
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)
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import Brick.Widgets.Core
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( (<+>)
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, vBox
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, str
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, hLimit
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, withDefAttr
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)
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import Brick.Util (on, fg)
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import Brick.AttrMap (AttrName)
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ui :: Widget n
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ui =
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center $
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hLimit 40 $
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vBox $ hCenter <$>
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[ str "Press " <+> (withDefAttr keybindingAttr $ str "1") <+> str " to switch to theme 1."
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, str "Press " <+> (withDefAttr keybindingAttr $ str "2") <+> str " to switch to theme 2."
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]
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keybindingAttr :: AttrName
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keybindingAttr = "keybinding"
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theme1 :: Theme
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theme1 =
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newTheme (white `on` blue)
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[ (keybindingAttr, fg magenta)
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]
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theme2 :: Theme
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theme2 =
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newTheme (green `on` black)
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[ (keybindingAttr, fg yellow)
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]
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appEvent :: Int -> BrickEvent () e -> EventM () (Next Int)
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appEvent _ (VtyEvent (EvKey (KChar '1') [])) = continue 1
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appEvent _ (VtyEvent (EvKey (KChar '2') [])) = continue 2
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appEvent s (VtyEvent (EvKey (KChar 'q') [])) = halt s
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appEvent s (VtyEvent (EvKey KEsc [])) = halt s
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appEvent s _ = continue s
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app :: App Int e ()
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app =
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App { appDraw = const [ui]
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, appHandleEvent = appEvent
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, appStartEvent = return
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, appAttrMap = \s ->
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-- Note that in practice this is not ideal: we don't want
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-- to build an attribute from a theme every time this is
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-- invoked, because it gets invoked once per redraw. Instead
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-- we'd build the attribute map at startup and store it in
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-- the application state. Here I just use themeToAttrMap to
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-- show the mechanics of the API.
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if s == 1
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then themeToAttrMap theme1
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else themeToAttrMap theme2
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, appChooseCursor = neverShowCursor
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}
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main :: IO ()
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main = void $ defaultMain app 1
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