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import options
import css/stylednode
import css/values
import layout/layoutunit
import types/color
type
Offset* = object
x*: LayoutUnit
y*: LayoutUnit
Size* = object
w*: LayoutUnit
h*: LayoutUnit
# min-content: box width is longest word's width
# max-content: box width is content width without wrapping
# stretch: box width is n px wide
# fit-content: also known as shrink-to-fit, box width is
# min(max-content, stretch(availableWidth))
# in other words, as wide as needed, but wrap if wider than allowed
# (note: I write width here, but it can apply for any constraint)
SizeConstraintType* = enum
STRETCH, FIT_CONTENT, MIN_CONTENT, MAX_CONTENT
SizeConstraint* = object
t*: SizeConstraintType
u*: LayoutUnit
BoxBuilder* = ref object of RootObj
children*: seq[BoxBuilder]
inlinelayout*: bool
computed*: CSSComputedValues
node*: StyledNode
InlineBoxBuilder* = ref object of BoxBuilder
text*: seq[string]
newline*: bool
splitstart*: bool
splitend*: bool
BlockBoxBuilder* = ref object of BoxBuilder
MarkerBoxBuilder* = ref object of InlineBoxBuilder
ListItemBoxBuilder* = ref object of BoxBuilder
marker*: MarkerBoxBuilder
content*: BlockBoxBuilder
TableRowGroupBoxBuilder* = ref object of BlockBoxBuilder
TableRowBoxBuilder* = ref object of BlockBoxBuilder
TableCellBoxBuilder* = ref object of BlockBoxBuilder
TableBoxBuilder* = ref object of BlockBoxBuilder
rowgroups*: seq[TableRowGroupBoxBuilder]
TableCaptionBoxBuilder* = ref object of BlockBoxBuilder
InlineAtomType* = enum
INLINE_SPACING, INLINE_PADDING, INLINE_WORD, INLINE_BLOCK
InlineAtom* = ref object
offset*: Offset
size*: Size
case t*: InlineAtomType
of INLINE_SPACING, INLINE_PADDING:
sformat*: ComputedFormat
of INLINE_WORD:
wformat*: ComputedFormat
str*: string
of INLINE_BLOCK:
innerbox*: BlockBox
ComputedFormat* = ref object
fontstyle*: CSSFontStyle
fontweight*: int
textdecoration*: set[CSSTextDecoration]
color*: RGBAColor
node*: StyledNode
#TODO: background color should not be stored in inline words. Instead,
# inline box fragments should be passed on to the renderer, which could
# then properly blend them.
bgcolor*: RGBAColor
LineBox* = ref object
atoms*: seq[InlineAtom]
offsety*: LayoutUnit
size*: Size
InlineContext* = ref object
offset*: Offset
height*: LayoutUnit
width*: LayoutUnit
lines*: seq[LineBox]
# baseline of the first line box
firstBaseline*: LayoutUnit
# baseline of the last line box
baseline*: LayoutUnit
# this is actually xminwidth.
minwidth*: LayoutUnit
BlockBox* = ref object of RootObj
inline*: InlineContext
node*: StyledNode
nested*: seq[BlockBox]
computed*: CSSComputedValues
offset*: Offset
# This is the padding width/height.
width*: LayoutUnit
height*: LayoutUnit
margin_top*: LayoutUnit
margin_bottom*: LayoutUnit
margin_left*: LayoutUnit
margin_right*: LayoutUnit
padding_top*: LayoutUnit
padding_bottom*: LayoutUnit
padding_left*: LayoutUnit
padding_right*: LayoutUnit
min_width*: Option[LayoutUnit]
max_width*: Option[LayoutUnit]
min_height*: Option[LayoutUnit]
max_height*: Option[LayoutUnit]
# width and height constraints
availableWidth*: SizeConstraint
availableHeight*: SizeConstraint
positioned*: bool
x_positioned*: bool
y_positioned*: bool
# very bad name. basically the minimum content width after the contents
# have been positioned (usually the width of the shortest word.) used
# in table cells.
xminwidth*: LayoutUnit
# baseline of the first line box of all descendants
firstBaseline*: LayoutUnit
# baseline of the last line box of all descendants
baseline*: LayoutUnit
ListItemBox* = ref object of BlockBox
marker*: InlineContext
func minContent*(): SizeConstraint =
return SizeConstraint(t: MIN_CONTENT)
func maxContent*(): SizeConstraint =
return SizeConstraint(t: MAX_CONTENT)
func stretch*(u: LayoutUnit): SizeConstraint =
return SizeConstraint(t: STRETCH, u: u)
func fitContent*(u: LayoutUnit): SizeConstraint =
return SizeConstraint(t: FIT_CONTENT, u: u)
#TODO ?
func stretch*(sc: SizeConstraint): SizeConstraint =
case sc.t
of MIN_CONTENT, MAX_CONTENT:
return SizeConstraint(t: sc.t, u: sc.u)
of STRETCH, FIT_CONTENT:
return SizeConstraint(t: STRETCH, u: sc.u)
func fitContent*(sc: SizeConstraint): SizeConstraint =
case sc.t
of MIN_CONTENT, MAX_CONTENT:
return SizeConstraint(t: sc.t)
of STRETCH, FIT_CONTENT:
return SizeConstraint(t: FIT_CONTENT, u: sc.u)
func isDefinite*(sc: SizeConstraint): bool =
return sc.t in {STRETCH, FIT_CONTENT}
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