import css/cssvalues
import css/stylednode
import img/bitmap
import layout/layoutunit
type
DimensionType* = enum
dtHorizontal, dtVertical
Offset* = array[DimensionType, LayoutUnit]
Size* = array[DimensionType, LayoutUnit]
Overflow* = array[DimensionType, Span]
InlineAtomType* = enum
iatWord, iatInlineBlock, iatImage
InlineAtom* = ref object
offset*: Offset
size*: Size
case t*: InlineAtomType
of iatWord:
str*: string
of iatInlineBlock:
innerbox*: BlockBox
of iatImage:
bmp*: Bitmap
RootInlineFragmentState* = object
# offset relative to parent
offset*: Offset
# padding size
size*: Size
# overflow relative to offset
overflow*: Overflow
# minimum content width
xminwidth*: LayoutUnit
# baseline of the first line box
firstBaseline*: LayoutUnit
# baseline of the last line box
baseline*: LayoutUnit
RootInlineFragment* = ref object
fragment*: InlineFragment # root fragment
state*: RootInlineFragmentState
SplitType* = enum
stSplitStart, stSplitEnd
Area* = object
offset*: Offset
size*: Size
InlineFragmentState* = object
startOffset*: Offset # offset of the first word, for position: absolute
areas*: seq[Area] # background that should be painted by fragment
atoms*: seq[InlineAtom]
InlineFragmentType* = enum
iftParent, iftText, iftNewline, iftBitmap, iftBox
InlineFragment* = ref object
state*: InlineFragmentState
computed*: CSSComputedValues
node*: StyledNode
splitType*: set[SplitType]
case t*: InlineFragmentType
of iftParent:
children*: seq[InlineFragment]
of iftText:
text*: StyledNode # note: this has no parent.
of iftNewline:
discard
of iftBitmap:
bmp*: Bitmap
of iftBox:
box*: BlockBox
Span* = object
start*: LayoutUnit
send*: LayoutUnit
RelativeRect* = array[DimensionType, Span]
BlockBoxLayoutState* = object
# offset relative to parent
offset*: Offset
# padding size
size*: Size
margin*: RelativeRect #TODO get rid of this?
positioned*: RelativeRect #TODO ditto
# overflow relative to offset
overflow*: Overflow
# minimum content width (usually shortest word)
xminwidth*: LayoutUnit
# baseline of the first line box of all descendants
firstBaseline*: LayoutUnit
# baseline of the last line box of all descendants
baseline*: LayoutUnit
BlockBox* = ref object
state*: BlockBoxLayoutState
computed*: CSSComputedValues
node*: StyledNode
inline*: RootInlineFragment
nested*: seq[BlockBox]
func offset*(x, y: LayoutUnit): Offset =
return [dtHorizontal: x, dtVertical: y]
func x*(offset: Offset): LayoutUnit {.inline.} =
return offset[dtHorizontal]
func x*(offset: var Offset): var LayoutUnit {.inline.} =
return offset[dtHorizontal]
func `x=`*(offset: var Offset; x: LayoutUnit) {.inline.} =
offset[dtHorizontal] = x
func y*(offset: Offset): LayoutUnit {.inline.} =
return offset[dtVertical]
func y*(offset: var Offset): var LayoutUnit {.inline.} =
return offset[dtVertical]
func `y=`*(offset: var Offset; y: LayoutUnit) {.inline.} =
offset[dtVertical] = y
func size*(w, h: LayoutUnit): Size =
return [dtHorizontal: w, dtVertical: h]
func w*(size: Size): LayoutUnit {.inline.} =
return size[dtHorizontal]
func w*(size: var Size): var LayoutUnit {.inline.} =
return size[dtHorizontal]
func `w=`*(size: var Size; w: LayoutUnit) {.inline.} =
size[dtHorizontal] = w
func h*(size: Size): LayoutUnit {.inline.} =
return size[dtVertical]
func h*(size: var Size): var LayoutUnit {.inline.} =
return size[dtVertical]
func `h=`*(size: var Size; h: LayoutUnit) {.inline.} =
size[dtVertical] = h
func `+`*(a, b: Offset): Offset =
return offset(x = a.x + b.x, y = a.y + b.y)
func `-`*(a, b: Offset): Offset =
return offset(x = a.x - b.x, y = a.y - b.y)
proc `+=`*(a: var Offset; b: Offset) =
a.x += b.x
a.y += b.y
proc `-=`*(a: var Offset; b: Offset) =
a.x -= b.x
a.y -= b.y
func left*(s: RelativeRect): LayoutUnit =
return s[dtHorizontal].start
func right*(s: RelativeRect): LayoutUnit =
return s[dtHorizontal].send
func top*(s: RelativeRect): LayoutUnit =
return s[dtVertical].start
func bottom*(s: RelativeRect): LayoutUnit =
return s[dtVertical].send
proc `+=`*(span: var Span; u: LayoutUnit) =
span.start += u
span.send += u