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layout: Implement keyword sizes for block layout heuristics (#34695)
Block layout uses some heuristics to guess whether margins are separated by clearance and then don't collapse. These heuristics now take the min-content, max-content, fit-content and stretch sizing keywords into account. Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau
GitHub
parent
2ab66ce678
commit
6be0a64939
9 changed files with 212 additions and 63 deletions
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@ -39,7 +39,7 @@ use crate::layout_box_base::LayoutBoxBase;
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use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
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use crate::replaced::ReplacedContents;
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use crate::sizing::{self, ComputeInlineContentSizes, ContentSizes, InlineContentSizesResult};
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use crate::style_ext::{Clamp, ComputedValuesExt, ContentBoxSizesAndPBM, PaddingBorderMargin};
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use crate::style_ext::{ComputedValuesExt, ContentBoxSizesAndPBM, PaddingBorderMargin};
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use crate::{
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ConstraintSpace, ContainingBlock, ContainingBlockSize, IndefiniteContainingBlock,
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SizeConstraint,
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@ -102,6 +102,7 @@ impl BlockLevelBox {
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fn find_block_margin_collapsing_with_parent(
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&self,
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layout_context: &LayoutContext,
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collected_margin: &mut CollapsedMargin,
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containing_block: &ContainingBlock,
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) -> bool {
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@ -122,9 +123,13 @@ impl BlockLevelBox {
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return false;
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}
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let pbm = style.padding_border_margin(containing_block);
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let start_margin = pbm.margin.block_start.auto_is(Au::zero);
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collected_margin.adjoin_assign(&CollapsedMargin::new(start_margin));
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let ContentBoxSizesAndPBM {
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content_box_sizes,
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pbm,
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..
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} = style.content_box_sizes_and_padding_border_margin(&containing_block.into());
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let margin = pbm.margin.auto_is(Au::zero);
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collected_margin.adjoin_assign(&CollapsedMargin::new(margin.block_start));
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let child_boxes = match self {
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BlockLevelBox::SameFormattingContextBlock { ref contents, .. } => match contents {
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@ -138,35 +143,45 @@ impl BlockLevelBox {
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return false;
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}
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let min_size = style
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.content_min_box_size_deprecated(containing_block, &pbm)
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.auto_is(Au::zero);
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let max_size = style.content_max_box_size_deprecated(containing_block, &pbm);
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let prefered_size = style.content_box_size_deprecated(containing_block, &pbm);
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let inline_size = prefered_size
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.inline
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.auto_is(|| {
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let margin_inline_start = pbm.margin.inline_start.auto_is(Au::zero);
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let margin_inline_end = pbm.margin.inline_end.auto_is(Au::zero);
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containing_block.size.inline -
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pbm.padding_border_sums.inline -
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margin_inline_start -
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margin_inline_end
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})
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.clamp_between_extremums(min_size.inline, max_size.inline);
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let block_size = prefered_size
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.block
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.map(|size| size.clamp_between_extremums(min_size.block, max_size.block));
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// FIXME: For BlockLevelBox::Independent, this should take floats into account.
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let available_inline_size =
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containing_block.size.inline - pbm.padding_border_sums.inline - margin.inline_sum();
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let available_block_size = containing_block.size.block.non_auto().map(|block_size| {
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Au::zero().max(block_size - pbm.padding_border_sums.block - margin.block_sum())
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});
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let tentative_block_size = content_box_sizes.block.resolve_extrinsic(
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Size::FitContent,
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Au::zero(),
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available_block_size,
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);
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let get_inline_content_sizes = || {
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let constraint_space = ConstraintSpace::new(
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tentative_block_size,
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style.writing_mode,
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None, /* TODO: support preferred aspect ratios on non-replaced boxes */
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);
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self.inline_content_sizes(layout_context, &constraint_space)
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.sizes
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};
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let inline_size = content_box_sizes.inline.resolve(
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Size::Stretch,
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Au::zero(),
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available_inline_size,
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get_inline_content_sizes,
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);
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let containing_block_for_children = ContainingBlock {
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size: ContainingBlockSize {
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inline: inline_size,
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block: block_size,
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block: tentative_block_size.to_auto_or(),
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},
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style,
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};
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if !Self::find_block_margin_collapsing_with_parent_from_slice(
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layout_context,
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child_boxes,
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collected_margin,
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&containing_block_for_children,
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@ -181,13 +196,13 @@ impl BlockLevelBox {
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return false;
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}
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let end_margin = pbm.margin.block_end.auto_is(Au::zero);
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collected_margin.adjoin_assign(&CollapsedMargin::new(end_margin));
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collected_margin.adjoin_assign(&CollapsedMargin::new(margin.block_end));
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true
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}
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fn find_block_margin_collapsing_with_parent_from_slice(
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layout_context: &LayoutContext,
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boxes: &[ArcRefCell<BlockLevelBox>],
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margin: &mut CollapsedMargin,
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containing_block: &ContainingBlock,
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@ -195,7 +210,7 @@ impl BlockLevelBox {
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boxes.iter().all(|block_level_box| {
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block_level_box
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.borrow()
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.find_block_margin_collapsing_with_parent(margin, containing_block)
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.find_block_margin_collapsing_with_parent(layout_context, margin, containing_block)
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})
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}
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}
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@ -230,6 +245,15 @@ impl OutsideMarker {
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&self.base.style
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}
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fn inline_content_sizes(
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&self,
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layout_context: &LayoutContext,
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constraint_space: &ConstraintSpace,
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) -> InlineContentSizesResult {
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self.base
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.inline_content_sizes(layout_context, constraint_space, &self.block_container)
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}
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fn layout(
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&self,
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layout_context: &LayoutContext<'_>,
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@ -242,11 +266,7 @@ impl OutsideMarker {
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&self.marker_style,
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None, /* TODO: support preferred aspect ratios on non-replaced boxes */
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);
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let content_sizes = self.base.inline_content_sizes(
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layout_context,
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&constraint_space,
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&self.block_container,
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);
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let content_sizes = self.inline_content_sizes(layout_context, &constraint_space);
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let containing_block_for_children = ContainingBlock {
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size: ContainingBlockSize {
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inline: content_sizes.sizes.max_content,
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@ -770,6 +790,25 @@ impl BlockLevelBox {
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),
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}
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}
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fn inline_content_sizes(
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&self,
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layout_context: &LayoutContext,
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constraint_space: &ConstraintSpace,
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) -> InlineContentSizesResult {
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let independent_formatting_context = match self {
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BlockLevelBox::Independent(independent) => independent,
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BlockLevelBox::OutOfFlowAbsolutelyPositionedBox(box_) => &box_.borrow().context,
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BlockLevelBox::OutOfFlowFloatBox(float_box) => &float_box.contents,
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BlockLevelBox::OutsideMarker(outside_marker) => {
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return outside_marker.inline_content_sizes(layout_context, constraint_space)
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},
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BlockLevelBox::SameFormattingContextBlock { base, contents, .. } => {
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return base.inline_content_sizes(layout_context, constraint_space, contents)
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},
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};
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independent_formatting_context.inline_content_sizes(layout_context, constraint_space)
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}
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}
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/// Lay out a normal flow non-replaced block that does not establish a new formatting
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@ -844,6 +883,7 @@ fn layout_in_flow_non_replaced_block_level_same_formatting_context(
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if !collapsible_with_parent_start_margin && start_margin_can_collapse_with_children {
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if let BlockContainer::BlockLevelBoxes(child_boxes) = contents {
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BlockLevelBox::find_block_margin_collapsing_with_parent_from_slice(
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layout_context,
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child_boxes,
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&mut block_start_margin,
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containing_block,
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