xmonad-config/lib/XMonad/Internal/DBus/Brightness/Common.hs

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--------------------------------------------------------------------------------
-- | DBus module for DBus brightness controls
module XMonad.Internal.DBus.Brightness.Common
( BrightnessConfig(..)
, BrightnessControls(..)
, brightnessControls
, brightnessExporter
, callGetBrightness
, matchSignal
) where
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import Control.Monad (void)
import Data.Int (Int32)
import DBus
import DBus.Client
import XMonad.Internal.DBus.Common
import XMonad.Internal.Dependency
--------------------------------------------------------------------------------
-- | External API
--
-- Define four methods to increase, decrease, maximize, or minimize the
-- brightness. These methods will all return the current brightness as a 32-bit
-- integer and emit a signal with the same brightness value. Additionally, there
-- is one method to get the current brightness.
data BrightnessConfig a b = BrightnessConfig
{ bcMin :: a -> IO b
, bcMax :: a -> IO b
, bcDec :: a -> IO b
, bcInc :: a -> IO b
, bcGet :: a -> IO b
, bcGetMax :: IO a
, bcPath :: ObjectPath
, bcInterface :: InterfaceName
}
data BrightnessControls = BrightnessControls
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{ bctlMax :: FeatureIO
, bctlMin :: FeatureIO
, bctlInc :: FeatureIO
, bctlDec :: FeatureIO
}
brightnessControls :: BrightnessConfig a b -> BrightnessControls
brightnessControls BrightnessConfig { bcPath = p, bcInterface = i } =
BrightnessControls
{ bctlMax = cb memMax
, bctlMin = cb memMin
, bctlInc = cb memInc
, bctlDec = cb memDec
}
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where
cb = callBacklight p i
callGetBrightness :: Num c => BrightnessConfig a b -> IO (Maybe c)
callGetBrightness BrightnessConfig { bcPath = p, bcInterface = i } = do
reply <- callMethod $ methodCall p i memGet
return $ reply >>= bodyGetBrightness
matchSignal :: Num c => BrightnessConfig a b -> (Maybe c -> IO ()) -> IO SignalHandler
matchSignal BrightnessConfig { bcPath = p, bcInterface = i } cb = do
client <- connectSession
addMatch client brMatcher $ cb . bodyGetBrightness . signalBody
where
brMatcher = matchAny
{ matchPath = Just p
, matchInterface = Just i
, matchMember = Just memCur
}
--------------------------------------------------------------------------------
-- | Internal DBus Crap
brightnessExporter :: RealFrac b => [Dependency] -> BrightnessConfig a b
-> Client -> FeatureIO
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brightnessExporter deps bc client = Feature
{ ftrAction = exportBrightnessControls' bc client
, ftrSilent = False
, ftrChildren = deps
}
exportBrightnessControls' :: RealFrac b => BrightnessConfig a b -> Client -> IO ()
exportBrightnessControls' bc client = do
maxval <- bcGetMax bc -- assume the max value will never change
let autoMethod' m f = autoMethod m $ emitBrightness bc client =<< f bc maxval
let funget = bcGet bc
export client (bcPath bc) defaultInterface
{ interfaceName = bcInterface bc
, interfaceMethods =
[ autoMethod' memMax bcMax
, autoMethod' memMin bcMin
, autoMethod' memInc bcInc
, autoMethod' memDec bcDec
, autoMethod memGet (round <$> funget maxval :: IO Int32)
]
}
emitBrightness :: RealFrac b => BrightnessConfig a b -> Client -> b -> IO ()
emitBrightness BrightnessConfig{ bcPath = p, bcInterface = i } client cur =
emit client $ sig { signalBody = [toVariant (round cur :: Int32)] }
where
sig = signal p i memCur
callBacklight :: ObjectPath -> InterfaceName -> MemberName -> FeatureIO
callBacklight p i m =
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Feature
{ ftrAction = void $ callMethod $ methodCall p i m
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, ftrSilent = False
, ftrChildren = [xDbusDep p i $ Method_ m]
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}
bodyGetBrightness :: Num a => [Variant] -> Maybe a
bodyGetBrightness [b] = fromIntegral <$> (fromVariant b :: Maybe Int32)
bodyGetBrightness _ = Nothing
--------------------------------------------------------------------------------
-- | DBus Members
memCur :: MemberName
memCur = memberName_ "CurrentBrightness"
memGet :: MemberName
memGet = memberName_ "GetBrightness"
memMax :: MemberName
memMax = memberName_ "MaxBrightness"
memMin :: MemberName
memMin = memberName_ "MinBrightness"
memInc :: MemberName
memInc = memberName_ "IncBrightness"
memDec :: MemberName
memDec = memberName_ "DecBrightness"