-----------------------------------------------------------------------------
-- |
-- Module       : XMonad.Actions.FloatKeys
-- Description  :  Move and resize floating windows.
-- Copyright    : (c) Karsten Schoelzel <kuser@gmx.de>
-- License      : BSD
--
-- Maintainer   : Karsten Schoelzel <kuser@gmx.de>
-- Stability    : stable
-- Portability  : unportable
--
-- Move and resize floating windows.
-----------------------------------------------------------------------------

module XMonad.Actions.FloatKeys (
                -- * Usage
                -- $usage
                keysMoveWindow,
                keysMoveWindowTo,
                keysResizeWindow,
                keysAbsResizeWindow,
                directionMoveWindow,
                directionResizeWindow,
                Direction2D(..),
                P, G, ChangeDim
                ) where

import XMonad
import XMonad.Prelude (fi)
import XMonad.Util.Types

-- $usage
-- You can use this module with the following in your @xmonad.hs@:
--
-- >    import XMonad.Actions.FloatKeys
--
-- Then add appropriate key bindings, for example:
--
-- >  , ((modm,               xK_d     ), withFocused (keysResizeWindow (-10,-10) (1,1)))
-- >  , ((modm,               xK_s     ), withFocused (keysResizeWindow (10,10) (1,1)))
-- >  , ((modm .|. shiftMask, xK_d     ), withFocused (keysAbsResizeWindow (-10,-10) (1024,752)))
-- >  , ((modm .|. shiftMask, xK_s     ), withFocused (keysAbsResizeWindow (10,10) (1024,752)))
-- >  , ((modm,               xK_a     ), withFocused (keysMoveWindowTo (512,384) (1%2,1%2)))
--
-- Using "XMonad.Util.EZConfig" syntax, we can easily build keybindings
-- where @M-\<arrow-keys\>@ moves the currently focused window and
-- @M-S-\<arrow-keys\>@ resizes it using 'directionMoveWindow' and
-- 'directionResizeWindow':
--
-- > [ ("M-" <> m <> k, withFocused $ f i)
-- > | (i, k) <- zip [U, D, R, L] ["<Up>", "<Down>", "<Right>", "<Left>"]
-- > , (f, m) <- [(directionMoveWindow 10, ""), (directionResizeWindow 10, "S-")]
-- > ]
--
-- For detailed instructions on editing your key bindings, see
-- <https://xmonad.org/TUTORIAL.html#customizing-xmonad the tutorial>.

-- | @directionMoveWindow delta dir win@ moves the window @win@ by
--   @delta@ pixels in direction @dir@.
directionMoveWindow :: Int -> Direction2D -> Window -> X ()
directionMoveWindow :: Int -> Direction2D -> Window -> X ()
directionMoveWindow Int
delta Direction2D
dir Window
win = case Direction2D
dir of
  Direction2D
U -> ChangeDim -> Window -> X ()
keysMoveWindow (Int
0, -Int
delta) Window
win
  Direction2D
D -> ChangeDim -> Window -> X ()
keysMoveWindow (Int
0, Int
delta)  Window
win
  Direction2D
R -> ChangeDim -> Window -> X ()
keysMoveWindow (Int
delta, Int
0)  Window
win
  Direction2D
L -> ChangeDim -> Window -> X ()
keysMoveWindow (-Int
delta, Int
0) Window
win

-- | @directionResizeWindow delta dir win@ resizes the window @win@ by
--   @delta@ pixels in direction @dir@.
directionResizeWindow :: Int -> Direction2D -> Window -> X ()
directionResizeWindow :: Int -> Direction2D -> Window -> X ()
directionResizeWindow Int
delta Direction2D
dir Window
win = case Direction2D
dir of
  Direction2D
U -> ChangeDim -> G -> Window -> X ()
keysResizeWindow (Int
0, -Int
delta) (Rational
0, Rational
0) Window
win
  Direction2D
D -> ChangeDim -> G -> Window -> X ()
keysResizeWindow (Int
0, Int
delta)  (Rational
0, Rational
0) Window
win
  Direction2D
R -> ChangeDim -> G -> Window -> X ()
keysResizeWindow (Int
delta, Int
0)  (Rational
0, Rational
0) Window
win
  Direction2D
L -> ChangeDim -> G -> Window -> X ()
keysResizeWindow (-Int
delta, Int
0) (Rational
0, Rational
0) Window
win

-- | @keysMoveWindow (dx, dy)@ moves the window by @dx@ pixels to the
--   right and @dy@ pixels down.
keysMoveWindow :: ChangeDim -> Window -> X ()
keysMoveWindow :: ChangeDim -> Window -> X ()
keysMoveWindow (Int
dx,Int
dy) Window
w = X Bool -> X () -> X ()
whenX (Window -> X Bool
isClient Window
w) forall a b. (a -> b) -> a -> b
$ forall a. (Display -> X a) -> X a
withDisplay forall a b. (a -> b) -> a -> b
$ \Display
d ->
  Display -> Window -> (WindowAttributes -> X ()) -> X ()
withWindowAttributes Display
d Window
w forall a b. (a -> b) -> a -> b
$ \WindowAttributes
wa -> do
    forall (m :: * -> *) a. MonadIO m => IO a -> m a
io forall a b. (a -> b) -> a -> b
$ Display -> Window -> Position -> Position -> IO ()
moveWindow Display
d Window
w (forall a b. (Integral a, Num b) => a -> b
fi (forall a b. (Integral a, Num b) => a -> b
fi (WindowAttributes -> CInt
wa_x WindowAttributes
wa) forall a. Num a => a -> a -> a
+ Int
dx))
                        (forall a b. (Integral a, Num b) => a -> b
fi (forall a b. (Integral a, Num b) => a -> b
fi (WindowAttributes -> CInt
wa_y WindowAttributes
wa) forall a. Num a => a -> a -> a
+ Int
dy))
    Window -> X ()
float Window
w

-- | @keysMoveWindowTo (x, y) (gx, gy)@ moves the window relative
--   point @(gx, gy)@ to the point @(x,y)@, where @(gx,gy)@ gives a
--   position relative to the window border, i.e.  @gx = 0@ is the left
--   border, @gx = 1@ is the right border, @gy = 0@ is the top border, and
--   @gy = 1@ the bottom border.
--
--   For example, on a 1024x768 screen:
--
-- > keysMoveWindowTo (512,384) (1%2, 1%2) -- center the window on screen
-- > keysMoveWindowTo (1024,0) (1, 0)      -- put window in the top right corner
keysMoveWindowTo :: P -> G -> Window -> X ()
keysMoveWindowTo :: P -> G -> Window -> X ()
keysMoveWindowTo (Position
x,Position
y) (Rational
gx, Rational
gy) Window
w = X Bool -> X () -> X ()
whenX (Window -> X Bool
isClient Window
w) forall a b. (a -> b) -> a -> b
$ forall a. (Display -> X a) -> X a
withDisplay forall a b. (a -> b) -> a -> b
$ \Display
d ->
  Display -> Window -> (WindowAttributes -> X ()) -> X ()
withWindowAttributes Display
d Window
w forall a b. (a -> b) -> a -> b
$ \WindowAttributes
wa -> do
    forall (m :: * -> *) a. MonadIO m => IO a -> m a
io forall a b. (a -> b) -> a -> b
$ Display -> Window -> Position -> Position -> IO ()
moveWindow Display
d Window
w (Position
x forall a. Num a => a -> a -> a
- forall a b. (RealFrac a, Integral b) => a -> b
round (Rational
gx forall a. Num a => a -> a -> a
* forall a b. (Integral a, Num b) => a -> b
fi (WindowAttributes -> CInt
wa_width WindowAttributes
wa)))
                        (Position
y forall a. Num a => a -> a -> a
- forall a b. (RealFrac a, Integral b) => a -> b
round (Rational
gy forall a. Num a => a -> a -> a
* forall a b. (Integral a, Num b) => a -> b
fi (WindowAttributes -> CInt
wa_height WindowAttributes
wa)))
    Window -> X ()
float Window
w

type G = (Rational, Rational)
type P = (Position, Position)
type ChangeDim = (Int, Int)

-- | @keysResizeWindow (dx, dy) (gx, gy)@ changes the width by @dx@
--   and the height by @dy@, leaving the window-relative point @(gx,
--   gy)@ fixed.
--
--   For example:
--
-- > keysResizeWindow (10, 0) (0, 0)      -- make the window 10 pixels larger to the right
-- > keysResizeWindow (10, 0) (0, 1%2)    -- does the same, unless sizeHints are applied
-- > keysResizeWindow (10, 10) (1%2, 1%2) -- add 5 pixels on each side
-- > keysResizeWindow (-10, -10) (0, 1)   -- shrink the window in direction of the bottom-left corner
keysResizeWindow :: ChangeDim -> G -> Window -> X ()
keysResizeWindow :: ChangeDim -> G -> Window -> X ()
keysResizeWindow = forall a b.
(SizeHints -> P -> D -> a -> b -> (P, D))
-> a -> b -> Window -> X ()
keysMoveResize SizeHints -> P -> D -> ChangeDim -> G -> (P, D)
keysResizeWindow'

-- | @keysAbsResizeWindow (dx, dy) (ax, ay)@ changes the width by @dx@
--   and the height by @dy@, leaving the screen absolute point @(ax,
--   ay)@ fixed.
--
--   For example:
--
-- > keysAbsResizeWindow (10, 10) (0, 0)   -- enlarge the window; if it is not in the top-left corner it will also be moved down and to the right.
keysAbsResizeWindow :: ChangeDim -> D -> Window -> X ()
keysAbsResizeWindow :: ChangeDim -> D -> Window -> X ()
keysAbsResizeWindow = forall a b.
(SizeHints -> P -> D -> a -> b -> (P, D))
-> a -> b -> Window -> X ()
keysMoveResize SizeHints -> P -> D -> ChangeDim -> D -> (P, D)
keysAbsResizeWindow'

keysAbsResizeWindow' :: SizeHints -> P -> D -> ChangeDim -> D -> (P,D)
keysAbsResizeWindow' :: SizeHints -> P -> D -> ChangeDim -> D -> (P, D)
keysAbsResizeWindow' SizeHints
sh (Position
x,Position
y) (Dimension
w,Dimension
h) (Int
dx,Int
dy) (Dimension
ax, Dimension
ay) = ((forall a b. (RealFrac a, Integral b) => a -> b
round Rational
nx, forall a b. (RealFrac a, Integral b) => a -> b
round Rational
ny), (Dimension
nw, Dimension
nh))
    where
        -- The width and height of a window are positive and thus
        -- converting to 'Dimension' should be safe.
        (Dimension
nw, Dimension
nh) = forall a. Integral a => SizeHints -> (a, a) -> D
applySizeHintsContents SizeHints
sh (forall a b. (Integral a, Num b) => a -> b
fi Dimension
w forall a. Num a => a -> a -> a
+ Int
dx, forall a b. (Integral a, Num b) => a -> b
fi Dimension
h forall a. Num a => a -> a -> a
+ Int
dy)
        nx :: Rational
        nx :: Rational
nx = forall a b. (Integral a, Num b) => a -> b
fi (Dimension
ax forall a. Num a => a -> a -> a
* Dimension
w forall a. Num a => a -> a -> a
+ Dimension
nw forall a. Num a => a -> a -> a
* (forall a b. (Integral a, Num b) => a -> b
fi Position
x forall a. Num a => a -> a -> a
- Dimension
ax)) forall a. Fractional a => a -> a -> a
/ forall a b. (Integral a, Num b) => a -> b
fi Dimension
w
        ny :: Rational
        ny :: Rational
ny = forall a b. (Integral a, Num b) => a -> b
fi (Dimension
ay forall a. Num a => a -> a -> a
* Dimension
h forall a. Num a => a -> a -> a
+ Dimension
nh forall a. Num a => a -> a -> a
* (forall a b. (Integral a, Num b) => a -> b
fi Position
y forall a. Num a => a -> a -> a
- Dimension
ay)) forall a. Fractional a => a -> a -> a
/ forall a b. (Integral a, Num b) => a -> b
fi Dimension
h

keysResizeWindow' :: SizeHints -> P -> D -> ChangeDim -> G -> (P,D)
keysResizeWindow' :: SizeHints -> P -> D -> ChangeDim -> G -> (P, D)
keysResizeWindow' SizeHints
sh (Position
x,Position
y) (Dimension
w,Dimension
h) (Int
dx,Int
dy) (Rational
gx, Rational
gy) = ((Position
nx, Position
ny), (Dimension
nw, Dimension
nh))
    where
        (Dimension
nw, Dimension
nh) = forall a. Integral a => SizeHints -> (a, a) -> D
applySizeHintsContents SizeHints
sh (forall a b. (Integral a, Num b) => a -> b
fi Dimension
w forall a. Num a => a -> a -> a
+ Int
dx, forall a b. (Integral a, Num b) => a -> b
fi Dimension
h forall a. Num a => a -> a -> a
+ Int
dy)
        nx :: Position
nx = forall a b. (RealFrac a, Integral b) => a -> b
round forall a b. (a -> b) -> a -> b
$ forall a b. (Integral a, Num b) => a -> b
fi Position
x forall a. Num a => a -> a -> a
+ Rational
gx forall a. Num a => a -> a -> a
* forall a b. (Integral a, Num b) => a -> b
fi Dimension
w forall a. Num a => a -> a -> a
- Rational
gx forall a. Num a => a -> a -> a
* forall a b. (Integral a, Num b) => a -> b
fi Dimension
nw
        ny :: Position
ny = forall a b. (RealFrac a, Integral b) => a -> b
round forall a b. (a -> b) -> a -> b
$ forall a b. (Integral a, Num b) => a -> b
fi Position
y forall a. Num a => a -> a -> a
+ Rational
gy forall a. Num a => a -> a -> a
* forall a b. (Integral a, Num b) => a -> b
fi Dimension
h forall a. Num a => a -> a -> a
- Rational
gy forall a. Num a => a -> a -> a
* forall a b. (Integral a, Num b) => a -> b
fi Dimension
nh

keysMoveResize :: (SizeHints -> P -> D -> a -> b -> (P,D)) -> a -> b -> Window -> X ()
keysMoveResize :: forall a b.
(SizeHints -> P -> D -> a -> b -> (P, D))
-> a -> b -> Window -> X ()
keysMoveResize SizeHints -> P -> D -> a -> b -> (P, D)
f a
move b
resize Window
w = X Bool -> X () -> X ()
whenX (Window -> X Bool
isClient Window
w) forall a b. (a -> b) -> a -> b
$ forall a. (Display -> X a) -> X a
withDisplay forall a b. (a -> b) -> a -> b
$ \Display
d ->
  Display -> Window -> (WindowAttributes -> X ()) -> X ()
withWindowAttributes Display
d Window
w forall a b. (a -> b) -> a -> b
$ \WindowAttributes
wa -> do
    SizeHints
sh <- forall (m :: * -> *) a. MonadIO m => IO a -> m a
io forall a b. (a -> b) -> a -> b
$ Display -> Window -> IO SizeHints
getWMNormalHints Display
d Window
w
    let wa_dim :: D
wa_dim = (forall a b. (Integral a, Num b) => a -> b
fi forall a b. (a -> b) -> a -> b
$ WindowAttributes -> CInt
wa_width WindowAttributes
wa, forall a b. (Integral a, Num b) => a -> b
fi forall a b. (a -> b) -> a -> b
$ WindowAttributes -> CInt
wa_height WindowAttributes
wa)
        wa_pos :: P
wa_pos = (forall a b. (Integral a, Num b) => a -> b
fi forall a b. (a -> b) -> a -> b
$ WindowAttributes -> CInt
wa_x WindowAttributes
wa, forall a b. (Integral a, Num b) => a -> b
fi forall a b. (a -> b) -> a -> b
$ WindowAttributes -> CInt
wa_y WindowAttributes
wa)
        (P
wn_pos, D
wn_dim) = SizeHints -> P -> D -> a -> b -> (P, D)
f SizeHints
sh P
wa_pos D
wa_dim a
move b
resize
    forall (m :: * -> *) a. MonadIO m => IO a -> m a
io forall a b. (a -> b) -> a -> b
$ Display -> Window -> Dimension -> Dimension -> IO ()
resizeWindow Display
d Window
w forall a b c. (a -> b -> c) -> (a, b) -> c
`uncurry` D
wn_dim
    forall (m :: * -> *) a. MonadIO m => IO a -> m a
io forall a b. (a -> b) -> a -> b
$ Display -> Window -> Position -> Position -> IO ()
moveWindow Display
d Window
w forall a b c. (a -> b -> c) -> (a, b) -> c
`uncurry` P
wn_pos
    Window -> X ()
float Window
w