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Move solve_axis function to module level
This commit is contained in:
Simon Sapin
parent
29067225a4
commit
be8df1d114
1 changed files with 102 additions and 105 deletions
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@ -170,7 +170,7 @@ impl<'a> AbsolutelyPositionedFragment<'a> {
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block: LengthOrAuto::LengthPercentage(u.block),
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};
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replaced_used_size = Some(u);
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}
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},
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Err(_non_replaced) => {
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let box_size = style.box_size();
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size = Vec2 {
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@ -178,116 +178,14 @@ impl<'a> AbsolutelyPositionedFragment<'a> {
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block: box_size.block.percentage_relative_to(cbbs),
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};
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replaced_used_size = None;
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}
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},
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}
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let padding = style.padding().percentages_relative_to(cbis);
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let border = style.border_width();
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let computed_margin = style.margin().percentages_relative_to(cbis);
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let pb = &padding + &border;
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enum Anchor {
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Start(Length),
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End(Length),
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}
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/// This unifies both:
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///
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/// * https://drafts.csswg.org/css2/visudet.html#abs-non-replaced-width
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/// * https://drafts.csswg.org/css2/visudet.html#abs-non-replaced-height
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///
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/// … and:
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///
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/// * https://drafts.csswg.org/css2/visudet.html#abs-replaced-width
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/// * https://drafts.csswg.org/css2/visudet.html#abs-replaced-height
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///
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/// In the replaced case, `size` is never `Auto`.
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fn solve_axis(
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containing_size: Length,
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padding_border_sum: Length,
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computed_margin_start: LengthOrAuto,
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computed_margin_end: LengthOrAuto,
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avoid_negative_margin_start: bool,
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box_offsets: AbsoluteBoxOffsets,
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size: LengthOrAuto,
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) -> (Anchor, LengthOrAuto, Length, Length) {
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match box_offsets {
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AbsoluteBoxOffsets::StaticStart { start } => (
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Anchor::Start(start),
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size,
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computed_margin_start.auto_is(Length::zero),
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computed_margin_end.auto_is(Length::zero),
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),
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AbsoluteBoxOffsets::Start { start } => (
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Anchor::Start(start.percentage_relative_to(containing_size)),
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size,
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computed_margin_start.auto_is(Length::zero),
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computed_margin_end.auto_is(Length::zero),
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),
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AbsoluteBoxOffsets::End { end } => (
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Anchor::End(end.percentage_relative_to(containing_size)),
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size,
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computed_margin_start.auto_is(Length::zero),
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computed_margin_end.auto_is(Length::zero),
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),
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AbsoluteBoxOffsets::Both { start, end } => {
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let start = start.percentage_relative_to(containing_size);
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let end = end.percentage_relative_to(containing_size);
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let margin_start;
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let margin_end;
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let used_size;
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if let LengthOrAuto::LengthPercentage(s) = size {
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used_size = s;
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let margins = containing_size - start - end - padding_border_sum - s;
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match (computed_margin_start, computed_margin_end) {
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(LengthOrAuto::Auto, LengthOrAuto::Auto) => {
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if avoid_negative_margin_start && margins < Length::zero() {
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margin_start = Length::zero();
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margin_end = margins;
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} else {
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margin_start = margins / 2.;
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margin_end = margins / 2.;
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}
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},
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(LengthOrAuto::Auto, LengthOrAuto::LengthPercentage(end)) => {
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margin_start = margins - end;
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margin_end = end;
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},
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(LengthOrAuto::LengthPercentage(start), LengthOrAuto::Auto) => {
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margin_start = start;
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margin_end = margins - start;
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},
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(
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LengthOrAuto::LengthPercentage(start),
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LengthOrAuto::LengthPercentage(end),
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) => {
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margin_start = start;
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margin_end = end;
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},
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}
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} else {
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margin_start = computed_margin_start.auto_is(Length::zero);
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margin_end = computed_margin_end.auto_is(Length::zero);
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// FIXME(nox): What happens if that is negative?
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used_size = containing_size -
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start -
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end -
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padding_border_sum -
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margin_start -
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margin_end
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};
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(
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Anchor::Start(start),
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LengthOrAuto::LengthPercentage(used_size),
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margin_start,
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margin_end,
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)
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},
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}
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}
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let (inline_anchor, inline_size, margin_inline_start, margin_inline_end) = solve_axis(
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cbis,
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pb.inline_sum(),
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@ -330,7 +228,9 @@ impl<'a> AbsolutelyPositionedFragment<'a> {
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// https://drafts.csswg.org/css2/visudet.html#abs-non-replaced-height
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let inline_size = inline_size.auto_is(|| {
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let available_size = match inline_anchor {
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Anchor::Start(start) => cbis - start - pb.inline_sum() - margin.inline_sum(),
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Anchor::Start(start) => {
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cbis - start - pb.inline_sum() - margin.inline_sum()
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},
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Anchor::End(end) => cbis - end - pb.inline_sum() - margin.inline_sum(),
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};
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self.absolutely_positioned_box
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@ -404,6 +304,103 @@ impl<'a> AbsolutelyPositionedFragment<'a> {
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}
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}
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enum Anchor {
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Start(Length),
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End(Length),
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}
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/// This unifies some of the parts in common in:
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///
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/// * https://drafts.csswg.org/css2/visudet.html#abs-non-replaced-width
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/// * https://drafts.csswg.org/css2/visudet.html#abs-non-replaced-height
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///
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/// … and:
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///
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/// * https://drafts.csswg.org/css2/visudet.html#abs-replaced-width
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/// * https://drafts.csswg.org/css2/visudet.html#abs-replaced-height
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///
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/// In the replaced case, `size` is never `Auto`.
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fn solve_axis(
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containing_size: Length,
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padding_border_sum: Length,
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computed_margin_start: LengthOrAuto,
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computed_margin_end: LengthOrAuto,
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avoid_negative_margin_start: bool,
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box_offsets: AbsoluteBoxOffsets,
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size: LengthOrAuto,
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) -> (Anchor, LengthOrAuto, Length, Length) {
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match box_offsets {
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AbsoluteBoxOffsets::StaticStart { start } => (
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Anchor::Start(start),
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size,
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computed_margin_start.auto_is(Length::zero),
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computed_margin_end.auto_is(Length::zero),
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),
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AbsoluteBoxOffsets::Start { start } => (
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Anchor::Start(start.percentage_relative_to(containing_size)),
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size,
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computed_margin_start.auto_is(Length::zero),
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computed_margin_end.auto_is(Length::zero),
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),
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AbsoluteBoxOffsets::End { end } => (
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Anchor::End(end.percentage_relative_to(containing_size)),
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size,
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computed_margin_start.auto_is(Length::zero),
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computed_margin_end.auto_is(Length::zero),
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),
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AbsoluteBoxOffsets::Both { start, end } => {
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let start = start.percentage_relative_to(containing_size);
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let end = end.percentage_relative_to(containing_size);
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let margin_start;
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let margin_end;
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let used_size;
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if let LengthOrAuto::LengthPercentage(s) = size {
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used_size = s;
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let margins = containing_size - start - end - padding_border_sum - s;
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match (computed_margin_start, computed_margin_end) {
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(LengthOrAuto::Auto, LengthOrAuto::Auto) => {
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if avoid_negative_margin_start && margins < Length::zero() {
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margin_start = Length::zero();
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margin_end = margins;
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} else {
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margin_start = margins / 2.;
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margin_end = margins / 2.;
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}
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},
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(LengthOrAuto::Auto, LengthOrAuto::LengthPercentage(end)) => {
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margin_start = margins - end;
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margin_end = end;
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},
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(LengthOrAuto::LengthPercentage(start), LengthOrAuto::Auto) => {
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margin_start = start;
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margin_end = margins - start;
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},
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(
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LengthOrAuto::LengthPercentage(start),
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LengthOrAuto::LengthPercentage(end),
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) => {
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margin_start = start;
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margin_end = end;
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},
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}
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} else {
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margin_start = computed_margin_start.auto_is(Length::zero);
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margin_end = computed_margin_end.auto_is(Length::zero);
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// FIXME(nox): What happens if that is negative?
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used_size =
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containing_size - start - end - padding_border_sum - margin_start - margin_end
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};
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(
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Anchor::Start(start),
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LengthOrAuto::LengthPercentage(used_size),
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margin_start,
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margin_end,
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)
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},
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}
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}
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pub(crate) fn adjust_static_positions(
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absolutely_positioned_fragments: &mut [AbsolutelyPositionedFragment],
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child_fragments: &mut [Fragment],
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