taffybar-0.1.0: src/System/Taffybar/Widgets/PollingBar.hs

-- | Like the vertical bar, but this widget automatically updates
-- itself with a callback at fixed intervals.
module System.Taffybar.Widgets.PollingBar (
  -- * Types
  VerticalBarHandle,
  BarConfig(..),
  -- * Constructors and accessors
  pollingBarNew,
  defaultBarConfig
  ) where

import Control.Concurrent
import Control.Monad ( forever )
import Graphics.UI.Gtk

import System.Taffybar.Widgets.VerticalBar

pollingBarNew :: BarConfig -> Double -> IO Double -> IO Widget
pollingBarNew cfg pollSeconds action = do
  (drawArea, h) <- verticalBarNew cfg

  _ <- forkIO $ forever $ do
    sample <- action
    verticalBarSetPercent h sample
    threadDelay $ floor (pollSeconds * 1000000)

  return drawArea