New extension: XMonad.Hooks.ScreenCorners

Ignore-this: c3a715e2590ed094ed5908bd225b185e

darcs-hash:20100221230259-1f2e3-5ab2ebd73348ba8c870f1abfac7dd2bacfe5c96d.gz

1 files changed, 107 insertions, 0 deletions

diff --git a/XMonad/Hooks/ScreenCorners.hs b/XMonad/Hooks/ScreenCorners.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Hooks.ScreenCorners
+-- Copyright   :  (c) 2009 Nils Schweinsberg
+-- License     :  BSD3-style (see LICENSE)
+--
+-- Maintainer  :  Nils Schweinsberg <mail@n-sch.de>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- Run @X ()@ actions by touching the edge of your screen the your mouse.
+--
+-----------------------------------------------------------------------------
+
+module XMonad.Hooks.ScreenCorners
+    (
+    -- * Usage
+    -- $usage
+    -- * Event hook
+      screenCornerEventHook
+    , ScreenCorner (..)
+
+    -- * X11 input methods
+    , defaultEventInput
+    , adjustEventInput
+    ) where
+
+import Data.Monoid
+import Foreign.C.Types
+
+import XMonad
+import XMonad.Actions.UpdateFocus (adjustEventInput)
+
+data ScreenCorner = SCUpperLeft
+                  | SCUpperRight
+                  | SCLowerLeft
+                  | SCLowerRight
+
+inCorner :: ScreenCorner -> X () -> Display -> CInt -> CInt -> X ()
+inCorner corner xF dpy ix iy = do
+
+    let
+        screen = defaultScreen dpy
+        xMax   = displayWidth  dpy screen - 1
+        yMax   = displayHeight dpy screen - 1
+        pos    = case (ix,iy, corner) of
+                      (0,0, SCUpperLeft)                           -> Just ()
+                      (x,0, SCUpperRight) | x == xMax              -> Just ()
+                      (0,y, SCLowerLeft)  | y == yMax              -> Just ()
+                      (x,y, SCLowerRight) | x == xMax && y == yMax -> Just ()
+                      _                                            -> Nothing
+
+    case pos of
+         Just _ -> do
+             -- Ignore any MotionEvents
+             defaultEventInput
+             -- Run our X ()
+             xF
+             -- Handle MotionEvents again
+             adjustEventInput
+
+         _ -> return ()
+
+-- | The event hook manager for @ScreenCorners@.
+screenCornerEventHook :: Event -> [(ScreenCorner, X ())] -> X All
+screenCornerEventHook MotionEvent { ev_event_display = dpy, ev_x = ix, ev_y = iy } lis = do
+
+    mapM_ (\(c,x) -> inCorner c x dpy ix iy) lis
+    return $ All True
+
+screenCornerEventHook _ _ = return $ All True
+
+
+-- | Use the default input methods
+defaultEventInput :: X ()
+defaultEventInput = withDisplay $ \dpy -> do
+    rootw <- asks theRoot
+    io $ selectInput dpy rootw $  substructureRedirectMask .|. substructureNotifyMask
+                              .|. enterWindowMask .|. leaveWindowMask .|. structureNotifyMask
+                              .|. buttonPressMask
+
+
+-- $usage
+--
+-- This extension adds KDE-like screen corners to XMonad. By moving your cursor
+-- into one of your screen corners you can trigger an @X ()@ action, for
+-- example "XMonad.Actions.GridSelect".gotoSelected or
+-- "XMonad.Actions.CycleWS".nextWS etc.
+--
+-- To use it, import it on top of your @xmonad.hs@:
+--
+-- > import XMonad.Hooks.ScreenCorners
+--
+-- Then add @adjustEventInput@ to your startup hook:
+--
+-- > myStartupHook = do
+-- >     ...
+-- >     adjustEventInput
+--
+-- And put your custom ScreenCorners to your event hook:
+--
+-- > myEventHook e = do
+-- >     ...
+-- >     screenCornerEventHook e [ (SCUpperRight, goToSelected defaultGSConfig { gs_cellwidth = 200 })
+-- >                             , (SCLowerRight, nextWS)
+-- >                             , (SCLowerLeft,  prevWS)
+-- >                             ]