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|
----------------------------------------------------------------------------
-- |
-- Module : XMonad.Util.Font
-- Copyright : (c) 2007 Andrea Rossato
-- License : BSD-style (see xmonad/LICENSE)
--
-- Maintainer : andrea.rossato@unibz.it
-- Stability : unstable
-- Portability : unportable
--
-- A module for abstracting a font facility over Core fonts and Xft
--
-----------------------------------------------------------------------------
module XMonad.Util.Font (
-- * Usage:
-- $usage
XMonadFont(..)
, initXMF
, releaseXMF
, initCoreFont
, releaseCoreFont
, Align (..)
, stringPosition
, textWidthXMF
, textExtentsXMF
, printStringXMF
, stringToPixel
) where
import Graphics.X11.Xlib
import Control.Monad.Reader
import XMonad
import Foreign
import XMonad.Operations
#ifdef XFT
import Data.List
import Graphics.X11.Xft
import Graphics.X11.Xrender
#endif
-- Hide the Core Font/Xft switching here
data XMonadFont = Core FontStruct
#ifdef XFT
| Xft XftFont
#endif
-- $usage
-- See Tabbed or Prompt for usage examples
-- | Get the Pixel value for a named color: if an invalid name is
-- given the black pixel will be returned.
stringToPixel :: MonadIO m => Display -> String -> m Pixel
stringToPixel d s = liftIO $ catch getIt fallBack
where getIt = initColor d s
fallBack = const $ return $ blackPixel d (defaultScreen d)
-- | Given a fontname returns the font structure. If the font name is
-- not valid the default font will be loaded and returned.
initCoreFont :: String -> X FontStruct
initCoreFont s = do
d <- asks display
io $ catch (getIt d) (fallBack d)
where getIt d = loadQueryFont d s
fallBack d = const $ loadQueryFont d "-misc-fixed-*-*-*-*-10-*-*-*-*-*-*-*"
releaseCoreFont :: FontStruct -> X ()
releaseCoreFont fs = do
d <- asks display
io $ freeFont d fs
-- | When initXMF gets a font name that starts with 'xft:' it switchs to the Xft backend
-- Example: 'xft: Sans-10'
initXMF :: String -> X XMonadFont
initXMF s =
#ifdef XFT
if xftPrefix `isPrefixOf` s then
do
dpy <- asks display
xftdraw <- io $ xftFontOpen dpy (defaultScreenOfDisplay dpy) (drop (length xftPrefix) s)
return (Xft xftdraw)
else
#endif
(initCoreFont s >>= (return . Core))
#ifdef XFT
where xftPrefix = "xft:"
#endif
releaseXMF :: XMonadFont -> X ()
releaseXMF (Core fs) = releaseCoreFont fs
#ifdef XFT
releaseXMF (Xft xftfont) = do
dpy <- asks display
io $ xftFontClose dpy xftfont
#endif
textWidthXMF :: MonadIO m => Display -> XMonadFont -> String -> m Int
textWidthXMF _ (Core fs) s = return $ fi $ textWidth fs s
#ifdef XFT
textWidthXMF dpy (Xft xftdraw) s = liftIO $ do
gi <- xftTextExtents dpy xftdraw s
return $ xglyphinfo_width gi
#endif
textExtentsXMF :: MonadIO m => Display -> XMonadFont -> String -> m (FontDirection,Int32,Int32,CharStruct)
textExtentsXMF _ (Core fs) s = return $ textExtents fs s
#ifdef XFT
textExtentsXMF _ (Xft xftfont) _ = liftIO $ do
ascent <- xftfont_ascent xftfont
descent <- xftfont_descent xftfont
return (error "Font direction touched", fi ascent, fi descent, error "Font overall size touched")
#endif
-- | String position
data Align = AlignCenter | AlignRight | AlignLeft
-- | Return the string x and y 'Position' in a 'Rectangle', given a
-- 'FontStruct' and the 'Align'ment
stringPosition :: XMonadFont -> Rectangle -> Align -> String -> X (Position,Position)
stringPosition fs (Rectangle _ _ w h) al s = do
dpy <- asks display
width <- io $ textWidthXMF dpy fs s
(_,a,d,_) <- io $ textExtentsXMF dpy fs s
let y = fi $ ((h - fi (a + d)) `div` 2) + fi a;
x = case al of
AlignCenter -> fi (w `div` 2) - fi (width `div` 2)
AlignLeft -> 1
AlignRight -> fi (w - (fi width + 1));
return (x,y)
printStringXMF :: MonadIO m => Display -> Drawable -> XMonadFont -> GC -> String -> String
-> Position -> Position -> String -> m ()
printStringXMF d p (Core fs) gc fc bc x y s = liftIO $ do
setFont d gc $ fontFromFontStruct fs
[fc',bc'] <- mapM (stringToPixel d) [fc,bc]
setForeground d gc fc'
setBackground d gc bc'
drawImageString d p gc x y s
#ifdef XFT
printStringXMF dpy drw (Xft font) _ fc _ x y s = do
let screen = defaultScreenOfDisplay dpy;
colormap = defaultColormapOfScreen screen;
visual = defaultVisualOfScreen screen;
liftIO $ withXftDraw dpy drw visual colormap $
\draw -> withXftColorName dpy visual colormap fc $
\color -> xftDrawString draw color font x y s
#endif
-- | Short-hand for 'fromIntegral'
fi :: (Integral a, Num b) => a -> b
fi = fromIntegral
|
