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-rw-r--r--XMonad/Actions/UpdatePointer.hs84
1 files changed, 39 insertions, 45 deletions
diff --git a/XMonad/Actions/UpdatePointer.hs b/XMonad/Actions/UpdatePointer.hs
index 9bd4fd4..8dbf5b6 100644
--- a/XMonad/Actions/UpdatePointer.hs
+++ b/XMonad/Actions/UpdatePointer.hs
@@ -19,12 +19,12 @@ module XMonad.Actions.UpdatePointer
-- * Usage
-- $usage
updatePointer
- , PointerPosition (..)
)
where
import XMonad
import XMonad.Util.XUtils (fi)
+import Control.Arrow
import Control.Monad
import XMonad.StackSet (member, peek, screenDetail, current)
import Data.Maybe
@@ -35,36 +35,32 @@ import Data.Maybe
-- > import XMonad
-- > import XMonad.Actions.UpdatePointer
--
--- Enable it by including it in your logHook definition. Eg:
+-- Enable it by including it in your logHook definition, e.g.:
--
--- > logHook = updatePointer Nearest
+-- > logHook = updatePointer (0.5, 0.5) (1, 1)
--
--- which will move the pointer to the nearest point of a newly focused window, or
+-- which will move the pointer to the nearest point of a newly focused
+-- window. The first argument establishes a reference point within the
+-- newly-focused window, while the second argument linearly interpolates
+-- between said reference point and the edges of the newly-focused window to
+-- obtain a bounding box for the pointer.
--
--- > logHook = updatePointer (Relative 0.5 0.5)
---
--- which will move the pointer to the center of a newly focused window, or
---
--- > logHook = updatePointer (TowardsCentre 0.75 0.75)
---
--- which will linearly interpolate the pointer between 'Nearest' and ¾ of
--- the way towards the centre of the window.
+-- > logHook = updatePointer (0.5, 0.5) (0, 0) -- exact centre of window
+-- > logHook = updatePointer (0.25, 0.25) (0.25, 0.25) -- near the top-left
+-- > logHook = updatePointer (0.5, 0.5) (1.1, 1.1) -- within 110% of the edge
--
-- To use this with an existing logHook, use >> :
--
-- > logHook = dynamicLog
--- > >> updatePointer (Relative 1 1)
+-- > >> updatePointer (1, 1) (0, 0)
--
-- which moves the pointer to the bottom-right corner of the focused window.
-data PointerPosition = Nearest | Relative Rational Rational | TowardsCentre Rational Rational
- deriving (Read,Show)
-
-- | Update the pointer's location to the currently focused
-- window or empty screen unless it's already there, or unless the user was changing
-- focus with the mouse
-updatePointer :: PointerPosition -> X ()
-updatePointer p = do
+updatePointer :: (Rational, Rational) -> (Rational, Rational) -> X ()
+updatePointer refPos ratio = do
ws <- gets windowset
dpy <- asks display
rect <- case peek ws of
@@ -72,39 +68,37 @@ updatePointer p = do
Just w -> windowAttributesToRectangle `fmap` io (getWindowAttributes dpy w)
root <- asks theRoot
mouseIsMoving <- asks mouseFocused
- (_sameRoot,_,currentWindow,rootx,rooty,_,_,_) <- io $ queryPointer dpy root
+ (_sameRoot,_,currentWindow,rootX,rootY,_,_,_) <- io $ queryPointer dpy root
drag <- gets dragging
- unless (pointWithin (fi rootx) (fi rooty) rect
+ unless (pointWithin (fi rootX) (fi rootY) rect
|| mouseIsMoving
|| isJust drag
- || not (currentWindow `member` ws || currentWindow == none)) $
- case p of
- Nearest -> do
- let x = moveWithin (fi rootx) (rect_x rect) (fi (rect_x rect) + fi (rect_width rect))
- y = moveWithin (fi rooty) (rect_y rect) (fi (rect_y rect) + fi (rect_height rect))
- io $ warpPointer dpy none root 0 0 0 0 x y
- TowardsCentre xfrc yfrc -> do
- let cx = fi (rect_width rect) / 2 + fi (rect_x rect)
- cy = fi (rect_height rect) / 2 + fi (rect_y rect)
- x,y,cx,cy :: Rational
- x = moveWithin (fi rootx) (fi $ rect_x rect) (fi (rect_x rect) + fi (rect_width rect))
- y = moveWithin (fi rooty) (fi $ rect_y rect) (fi (rect_y rect) + fi (rect_height rect))
- io $ warpPointer dpy none root 0 0 0 0 (round $ x + xfrc*(cx-x)) (round $ y + yfrc*(cy-y))
- Relative h v ->
- io $ warpPointer dpy none root 0 0 0 0
- (rect_x rect + fraction h (rect_width rect))
- (rect_y rect + fraction v (rect_height rect))
- where fraction x y = floor (x * fromIntegral y)
+ || not (currentWindow `member` ws || currentWindow == none)) $ let
+ -- focused rectangle
+ (rectX, rectY) = (rect_x &&& rect_y) rect
+ (rectW, rectH) = (fi . rect_width &&& fi . rect_height) rect
+ -- reference position, with (0,0) and (1,1) being top-left and bottom-right
+ refX = lerp (fst refPos) rectX (rectX + rectW)
+ refY = lerp (snd refPos) rectY (rectY + rectH)
+ -- final pointer bounds, lerped *outwards* from reference position
+ boundsX = join (***) (lerp (fst ratio) refX) (rectX, rectX + rectW)
+ boundsY = join (***) (lerp (snd ratio) refY) (rectY, rectY + rectH)
+ -- ideally we ought to move the pointer in a straight line towards the
+ -- reference point until it is within the above bounds, but…
+ in io $ warpPointer dpy none root 0 0 0 0
+ (round . clip boundsX $ fi rootX)
+ (round . clip boundsY $ fi rootY)
windowAttributesToRectangle :: WindowAttributes -> Rectangle
windowAttributesToRectangle wa = Rectangle (fi (wa_x wa))
(fi (wa_y wa))
(fi (wa_width wa + 2 * wa_border_width wa))
(fi (wa_height wa + 2 * wa_border_width wa))
-moveWithin :: Ord a => a -> a -> a -> a
-moveWithin now lower upper =
- if now < lower
- then lower
- else if now > upper
- then upper
- else now
+
+lerp :: (RealFrac r, Real a, Real b) => r -> a -> b -> r
+lerp r a b = (1 - r) * realToFrac a + r * realToFrac b
+
+clip :: Ord a => (a, a) -> a -> a
+clip (lower, upper) x = if x < lower then lower
+ else if x > upper then upper else x
+