209 lines
No EOL
6.7 KiB
Elm
209 lines
No EOL
6.7 KiB
Elm
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module Graphics.Element (widthOf, heightOf, sizeOf,
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width, height, opacity, color, tag, link,
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image, fittedImage, croppedImage,
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flow, up, down, left, right, inward, outward,
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above, below, beside, layers,
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container, absolute, relative,
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middle, topLeft, topRight, bottomLeft, bottomRight,
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midLeft, midRight, midTop, midBottom, middleAt,
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topLeftAt, topRightAt, bottomLeftAt, bottomRightAt,
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midLeftAt, midRightAt, midTopAt, midBottomAt,
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spacer, newElement
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) where
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import Native.Utils (guid, max, htmlHeight)
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import JavaScript as JS
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import List as List
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import Color
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import Maybe (Just, Nothing)
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type Properties = {
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id : Int,
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width : Int,
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height : Int,
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opacity : Float,
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color : Maybe Color,
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href : JSString,
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tag : JSString
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}
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type Element = { props : Properties, element : ElementPrim }
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widthOf : Element -> Int
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widthOf e = e.props.width
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heightOf : Element -> Int
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heightOf e = e.props.height
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sizeOf : Element -> Int
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sizeOf e = (e.props.width, e.props.height)
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width : Int -> Element -> Element
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width nw e = let p = e.props
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props = case e.element of
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Image _ w h _ -> {p| height <- h/w*nw }
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RawHtml html -> {p| height <- let (w,h) = htmlHeight nw html in h}
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_ -> p
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in { element=e.element, props={props| width <- nw} }
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height : Int -> Element -> Element
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height nh e = let p = e.props
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props = case e.element of
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Image _ w h _ -> {p| width <- w/h*nh }
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_ -> p
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in { element=e.element, props={p| height <- nh} }
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opacity : Float -> Element -> Element
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opacity o e = let p = e.props in { element=e.element, props={p| opacity <- o} }
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color : Color -> Element -> Element
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color c e = let p = e.props in
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{ element=e.element, props={p| color <- Just c} }
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tag : String -> Element -> Element
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tag name e = let p = e.props in
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{ element=e.element, props={p| tag <- JS.fromString name} }
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link : String -> Element -> Element
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link href e = let p = e.props in
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{ element=e.element, props={p| href <- JS.fromString href} }
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emptyStr = JS.fromString ""
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newElement w h e =
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{ props = Properties (guid ()) w h 1 Nothing emptyStr emptyStr, element = e }
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data ElementPrim
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= Image ImageStyle Int Int JSString
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| Container Position Element
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| Flow Direction [Element]
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| Spacer
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| RawHtml JSString
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| Custom -- for custom Elements implemented in JS, see collage for example
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data ImageStyle = Plain | Fitted | Cropped (Int,Int)
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image : Int -> Int -> String -> Element
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image w h src = newElement w h (Image Plain w h (JS.fromString src))
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fittedImage : Int -> Int -> String -> Element
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fittedImage w h src = newElement w h (Image Fitted w h (JS.fromString src))
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croppedImage : Int -> Int -> (Int,Int) -> String -> Element
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croppedImage w h pos src =
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newElement w h (Image (Cropped pos) w h (JS.fromString src))
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data Three = P | Z | N
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data Pos = Absolute Int | Relative Float
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type Position = { horizontal : Three, vertical : Three, x : Pos, y : Pos }
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container : Int -> Int -> Position -> Element -> Element
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container w h pos e = newElement w h (Container pos e)
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spacer : Int -> Int -> Element
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spacer w h = newElement w h Spacer
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data Direction = DUp | DDown | DLeft | DRight | DIn | DOut
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flow : Direction -> [Element] -> Element
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flow dir es =
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let ws = List.map widthOf es
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hs = List.map heightOf es
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newFlow w h = newElement w h (Flow dir es)
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in
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if es == [] then spacer 0 0 else
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case dir of
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DUp -> newFlow (List.maximum ws) (List.sum hs)
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DDown -> newFlow (List.maximum ws) (List.sum hs)
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DLeft -> newFlow (List.sum ws) (List.maximum hs)
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DRight -> newFlow (List.sum ws) (List.maximum hs)
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DIn -> newFlow (List.maximum ws) (List.maximum hs)
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DOut -> newFlow (List.maximum ws) (List.maximum hs)
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above : Element -> Element -> Element
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above hi lo =
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newElement (max (widthOf hi) (widthOf lo))
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(heightOf hi + heightOf lo)
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(Flow DDown [hi,lo])
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below : Element -> Element -> Element
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below lo hi =
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newElement (max (widthOf hi) (widthOf lo))
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(heightOf hi + heightOf lo)
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(Flow DDown [hi,lo])
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beside : Element -> Element -> Element
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beside lft rht =
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newElement (widthOf lft + widthOf rht)
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(max (heightOf lft) (heightOf rht))
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(Flow right [lft,rht])
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layers : [Element] -> Element
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layers es =
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let ws = List.map widthOf es
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hs = List.map heightOf es
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in newElement (List.maximum ws) (List.maximum hs) (Flow DOut es)
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-- Repetitive things --
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absolute : Int -> Pos
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absolute = Absolute
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relative : Float -> Pos
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relative = Relative
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middle : Position
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middle = { horizontal=Z, vertical=Z, x=Relative 0.5, y=Relative 0.5 }
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topLeft : Position
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topLeft = { horizontal=N, vertical=P, x=Absolute 0, y=Absolute 0 }
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topRight : Position
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topRight = { topLeft | horizontal <- P }
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bottomLeft : Position
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bottomLeft = { topLeft | vertical <- N }
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bottomRight : Position
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bottomRight = { bottomLeft | horizontal <- P }
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midLeft : Position
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midLeft = { middle | horizontal <- N, x <- Absolute 0 }
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midRight : Position
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midRight = { midLeft | horizontal <- P }
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midTop : Position
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midTop = { middle | vertical <- P, y <- Absolute 0 }
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midBottom : Position
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midBottom = { midTop | vertical <- N }
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middleAt : Pos -> Pos -> Position
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middleAt x y = { horizontal = Z, vertical = Z, x = x, y = y }
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topLeftAt : Pos -> Pos -> Position
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topLeftAt x y = { horizontal = N, vertical = P, x = x, y = y }
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topRightAt : Pos -> Pos -> Position
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topRightAt x y = { horizontal = P, vertical = P, x = x, y = y }
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bottomLeftAt : Pos -> Pos -> Position
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bottomLeftAt x y = { horizontal = N, vertical = N, x = x, y = y }
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bottomRightAt : Pos -> Pos -> Position
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bottomRightAt x y = { horizontal = P, vertical = N, x = x, y = y }
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midLeftAt : Pos -> Pos -> Position
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midLeftAt x y = { horizontal = N, vertical = Z, x = x, y = y }
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midRightAt : Pos -> Pos -> Position
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midRightAt x y = { horizontal = P, vertical = Z, x = x, y = y }
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midTopAt : Pos -> Pos -> Position
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midTopAt x y = { horizontal = Z, vertical = P, x = x, y = y }
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midBottomAt : Pos -> Pos -> Position
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midBottomAt x y = { horizontal = Z, vertical = N, x = x, y = y }
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up : Direction
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up = DUp
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down : Direction
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down = DDown
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left : Direction
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left = DLeft
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right : Direction
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right = DRight
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inward : Direction
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inward = DIn
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outward : Direction
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outward = DOut |