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86 lines
3.3 KiB
Haskell
86 lines
3.3 KiB
Haskell
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances #-}
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-----------------------------------------------------------------------------
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-- |
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-- Module : XMonad.Layout.LayoutHints
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-- Copyright : (c) David Roundy <droundy@darcs.net>
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-- License : BSD
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--
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-- Maintainer : none
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-- Stability : unstable
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-- Portability : portable
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--
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-- Make layouts respect size hints.
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-----------------------------------------------------------------------------
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module XMonad.Layout.LayoutHints
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( -- * usage
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-- $usage
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layoutHints
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, layoutHintsWithPlacement
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, LayoutHints
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, placeRectangle
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) where
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import XMonad hiding ( trace )
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import XMonad.Layout.LayoutModifier
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import XMonad.Layout.Decoration ( isInStack )
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import Control.Applicative ( (<$>) )
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import Control.Arrow ( second )
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-- $usage
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-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
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--
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-- > import XMonad.Layout.LayoutHints
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--
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-- Then edit your @layoutHook@ by adding the 'layoutHints' layout modifier
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-- to some layout:
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--
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-- > myLayouts = layoutHints (Tall 1 (3/100) (1/2)) ||| Full ||| etc..
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-- > main = xmonad defaultConfig { layoutHook = myLayouts }
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--
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-- Or, to center the adapted window in its available area:
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--
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-- > myLayouts = layoutHintsWithPlacement (0.5, 0.5) (Tall 1 (3/100) (1/2))
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-- > ||| Full ||| etc..
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--
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-- For more detailed instructions on editing the layoutHook see:
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--
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-- "XMonad.Doc.Extending#Editing_the_layout_hook"
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layoutHints :: (LayoutClass l a) => l a -> ModifiedLayout LayoutHints l a
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layoutHints = ModifiedLayout (LayoutHints (0, 0))
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-- | @layoutHintsWithPlacement (rx, ry) layout@ will adapt the sizes of a layout's
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-- windows according to their size hints, and position them inside their
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-- originally assigned area according to the @rx@ and @ry@ parameters.
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-- (0, 0) places the window at the top left, (1, 0) at the top right, (0.5, 0.5)
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-- at the center, etc.
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layoutHintsWithPlacement :: (LayoutClass l a) => (Double, Double)
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-> l a -> ModifiedLayout LayoutHints l a
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layoutHintsWithPlacement rs = ModifiedLayout (LayoutHints rs)
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data LayoutHints a = LayoutHints (Double, Double)
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deriving (Read, Show)
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instance LayoutModifier LayoutHints Window where
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modifierDescription _ = "Hinted"
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redoLayout _ _ Nothing xs = return (xs, Nothing)
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redoLayout (LayoutHints al) _ (Just s) xs
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= do xs' <- mapM (\x@(_, r) -> second (placeRectangle al r) <$> applyHint x) xs
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return (xs', Nothing)
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where
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applyHint (w,r@(Rectangle a b c d)) = do
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adj <- mkAdjust w
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let (c',d') = adj (c,d)
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return (w, if isInStack s w then Rectangle a b c' d' else r)
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-- | @placeRectangle (rx, ry) r0 r@ will return a new rectangle with the same dimensions
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-- as @r@, but positioned inside of @r0@ as specified by the (rx, ry) parameters (see
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-- 'layoutHintsWithPlacement').
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placeRectangle :: RealFrac r => (r, r) -> Rectangle -> Rectangle -> Rectangle
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placeRectangle (rx, ry) (Rectangle x0 y0 w h) (Rectangle _ _ dx dy)
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= Rectangle (align x0 dx w rx) (align y0 dy h ry) dx dy
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where align :: RealFrac r => Position -> Dimension -> Dimension -> r -> Position
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align z0 dz d r = z0 + truncate (fromIntegral (d - dz) * r) |