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63 lines
1.8 KiB
Haskell
63 lines
1.8 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Main where
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import Data.Monoid
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import Graphics.Vty
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( Event, Attr, white, blue, cyan, green, red, yellow
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, black
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)
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import Brick.Main
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import Brick.Widgets.Core
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( Widget
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, (<=>)
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, withAttr
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, vBox
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)
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import Brick.Util (on, fg)
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import Brick.AttrMap (attrMap, AttrMap)
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ui :: Widget
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ui =
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vBox [ "This text uses the global default attribute."
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, withAttr "foundFull"
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"Specifying an attribute name means we look it up in the attribute tree."
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, withAttr "foundFgOnly"
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("When we find a value, we merge it with its parent in the attribute"
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<=> "name tree all the way to the root (the global default).")
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, withAttr "missing"
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"A missing attribute name just resumes the search at its parent."
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, withAttr ("general" <> "specific")
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"In this way we build complete attribute values by using an inheritance scheme."
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, withAttr "foundFull"
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"You can override everything ..."
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, withAttr "foundFgOnly"
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"... or only you want to change and inherit the rest."
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, "Attribute names are assembled with the Monoid append operation to indicate"
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, "hierarchy levels, e.g. \"window\" <> \"title\"."
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]
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globalDefault :: Attr
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globalDefault = white `on` blue
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theMap :: AttrMap
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theMap = attrMap globalDefault
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[ ("foundFull", white `on` green)
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, ("foundFgOnly", fg red)
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, ("general", yellow `on` black)
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, ("general" <> "specific", fg cyan)
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]
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app :: App () Event
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app =
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App { appDraw = const [ui]
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, appHandleEvent = resizeOrQuit
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, appStartEvent = return
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, appAttrMap = const theMap
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, appChooseCursor = neverShowCursor
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, appMakeVtyEvent = id
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}
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main :: IO ()
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main = defaultMain app ()
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