{-# LANGUAGE CPP #-}
{- |

   Module      :  Graphics.Win32.Window.ForegroundWindow

   Copyright   :  2012 shelarcy

   License     :  BSD-style



   Maintainer  :  [email protected]

   Stability   :  Provisional

   Portability :  Non-portable (Win32 API)



   Get/Set Foreground Window.

-}

module Graphics.Win32.Window.ForegroundWindow
  ( getForegroundWindow
  , setForegroundWindow
  , c_SetForegroundWindow
  , allowSetForegroundWindow
  , c_AllowSetForegroundWindow
  ) where

import Control.Monad            ( void )
import Graphics.Win32.GDI.Types ( HWND )
import Graphics.Win32.Window    ( getForegroundWindow )
import System.Win32.Process     ( ProcessId )

#include "windows_cconv.h"


----------------------------------------------------------------

-- | Setting Window to Foreground.

-- See: <https://github.com/haskell/win32/pull/9>,

-- <http://stackoverflow.com/questions/14297146/win32-setforegroundwindow-in-haskell>.

----------------------------------------------------------------

setForegroundWindow :: HWND -> IO Bool
setForegroundWindow = c_SetForegroundWindow

foreign import WINDOWS_CCONV safe "windows.h SetForegroundWindow"
    c_SetForegroundWindow :: HWND -> IO Bool

----------------------------------------------------------------

-- | Allow other process to set Window to Foreground

-- by using 'setForegroundWindow' function.

allowSetForegroundWindow :: ProcessId -> IO ()
allowSetForegroundWindow = void . c_AllowSetForegroundWindow

foreign import WINDOWS_CCONV safe "windows.h AllowSetForegroundWindow"
    c_AllowSetForegroundWindow :: ProcessId -> IO Bool