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{-# LANGUAGE TupleSections #-}
module Graphics.Layout.Inline where
import Data.Text.ParagraphLayout (Paragraph(..), ParagraphOptions(..),
SpanLayout(..), Fragment(..),
ParagraphLayout(..), layoutPlain, Span(..))
import Data.Text.ParagraphLayout.Rect (Rect(..), width, height, x_min, y_min)
import Data.Text.Internal (Text(..))
import qualified Data.Text as Txt
import Data.Char (isSpace)
import Data.Int (Int32)
import Graphics.Layout.Box (Size(..), CastDouble(..), fromDouble)
import Graphics.Layout.CSS.Font (Font', hbScale)
hbScale' font = (/hbScale font) . fromIntegral
c font = fromDouble . hbScale' font
inlineMinWidth :: Font' -> Paragraph -> Double
inlineMinWidth font self = hbScale' font $ width $ layoutPlain' self 0
inlineNatWidth :: Font' -> Paragraph -> Double
inlineNatWidth font self = hbScale' font $ width $ layoutPlain' self maxBound
inlineHeight :: Font' -> Double -> Paragraph -> Double
inlineHeight font width self =
hbScale' font $ height $ layoutPlain' self $ round (hbScale font * width)
inlineSize :: (CastDouble x, CastDouble y) => Font' -> Paragraph -> Size x y
inlineSize font self = Size (c font $ width r) (c font $ height r)
where r = paragraphRect $ layoutPlain self
inlineChildren :: [x] -> Paragraph -> [(x, Fragment)]
inlineChildren vals self = zip vals $ concat $ map inner $ spanLayouts $ layoutPlain self
where inner (SpanLayout y) = y
layoutPlain' :: Paragraph -> Int32 -> Rect Int32
layoutPlain' (Paragraph a b c d) width =
paragraphRect $ layoutPlain $ Paragraph a b c d { paragraphMaxWidth = width }
fragmentSize :: (CastDouble x, CastDouble y) => Font' -> Fragment -> Size x y
fragmentSize font self = Size (c font $ width r) (c font $ height r)
where r = fragmentRect self
fragmentSize' :: CastDouble x => Font' -> Fragment -> Size x x
fragmentSize' = fragmentSize -- Work around for typesystem.
fragmentPos :: Font' -> (Double, Double) -> Fragment -> (Double, Double)
fragmentPos font (x, y) self =
(x + hbScale' font (x_min r), y + hbScale' font (y_min r))
where r = fragmentRect self