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-rw-r--r--components/layout/flexbox/layout.rs25
-rw-r--r--components/layout/flow/inline/line.rs2
-rw-r--r--components/layout/flow/inline/mod.rs4
-rw-r--r--components/layout/flow/mod.rs5
-rw-r--r--components/layout/flow/root.rs3
-rw-r--r--components/layout/formatting_contexts.rs5
-rw-r--r--components/layout/positioned.rs339
-rw-r--r--components/layout/style_ext.rs14
-rw-r--r--components/layout/table/layout.rs47
-rw-r--r--components/layout/taffy/layout.rs72
-rw-r--r--components/layout/taffy/mod.rs5
11 files changed, 193 insertions, 328 deletions
diff --git a/components/layout/flexbox/layout.rs b/components/layout/flexbox/layout.rs
index a5540123681..e69b792e272 100644
--- a/components/layout/flexbox/layout.rs
+++ b/components/layout/flexbox/layout.rs
@@ -49,7 +49,6 @@ use crate::{
struct FlexContext<'a> {
config: FlexContainerConfig,
layout_context: &'a LayoutContext<'a>,
- positioning_context: &'a mut PositioningContext,
containing_block: &'a ContainingBlock<'a>, // For items
container_inner_size_constraint: FlexRelativeVec2<SizeConstraint>,
}
@@ -657,7 +656,6 @@ impl FlexContainer {
let mut flex_context = FlexContext {
config: self.config.clone(),
layout_context,
- positioning_context,
containing_block,
// https://drafts.csswg.org/css-flexbox/#definite-sizes
container_inner_size_constraint: self.config.flex_axis.vec2_to_flex_relative(
@@ -1775,16 +1773,7 @@ impl FlexItem<'_> {
) -> Option<FlexItemLayoutResult> {
let containing_block = flex_context.containing_block;
let independent_formatting_context = &self.box_.independent_formatting_context;
- let mut positioning_context = independent_formatting_context
- .new_positioning_context()
- .unwrap_or_else(|| {
- PositioningContext::new_for_subtree(
- flex_context
- .positioning_context
- .collects_for_nearest_positioned_ancestor(),
- )
- });
-
+ let mut positioning_context = PositioningContext::default();
let item_writing_mode = independent_formatting_context.style().writing_mode;
let item_is_horizontal = item_writing_mode.is_horizontal();
let flex_axis = flex_context.config.flex_axis;
@@ -2617,17 +2606,7 @@ impl FlexItemBox {
cross_size_stretches_to_container_size: bool,
intrinsic_sizing_mode: IntrinsicSizingMode,
) -> Au {
- let mut positioning_context = self
- .independent_formatting_context
- .new_positioning_context()
- .unwrap_or_else(|| {
- PositioningContext::new_for_subtree(
- flex_context
- .positioning_context
- .collects_for_nearest_positioned_ancestor(),
- )
- });
-
+ let mut positioning_context = PositioningContext::default();
let style = self.independent_formatting_context.style();
match &self.independent_formatting_context.contents {
IndependentFormattingContextContents::Replaced(replaced) => {
diff --git a/components/layout/flow/inline/line.rs b/components/layout/flow/inline/line.rs
index e65eaed2367..80bab1080ed 100644
--- a/components/layout/flow/inline/line.rs
+++ b/components/layout/flow/inline/line.rs
@@ -331,7 +331,7 @@ impl LineItemLayout<'_, '_> {
self.calculate_inline_box_block_start(inline_box_state, space_above_baseline);
let positioning_context_or_start_offset_in_parent =
- match inline_box.base.new_positioning_context() {
+ match PositioningContext::new_for_layout_box_base(&inline_box.base) {
Some(positioning_context) => Either::Left(positioning_context),
None => Either::Right(self.current_positioning_context_mut().len()),
};
diff --git a/components/layout/flow/inline/mod.rs b/components/layout/flow/inline/mod.rs
index 25fbaa324b1..2023f4e7174 100644
--- a/components/layout/flow/inline/mod.rs
+++ b/components/layout/flow/inline/mod.rs
@@ -2004,9 +2004,7 @@ impl IndependentFormattingContext {
bidi_level: Level,
) {
// We need to know the inline size of the atomic before deciding whether to do the line break.
- let mut child_positioning_context = self
- .new_positioning_context()
- .unwrap_or_else(|| PositioningContext::new_for_subtree(true));
+ let mut child_positioning_context = PositioningContext::default();
let IndependentFloatOrAtomicLayoutResult {
mut fragment,
baselines,
diff --git a/components/layout/flow/mod.rs b/components/layout/flow/mod.rs
index 983282dc389..772b150ae1c 100644
--- a/components/layout/flow/mod.rs
+++ b/components/layout/flow/mod.rs
@@ -689,16 +689,13 @@ fn layout_block_level_children_in_parallel(
placement_state: &mut PlacementState,
ignore_block_margins_for_stretch: LogicalSides1D<bool>,
) -> Vec<Fragment> {
- let collects_for_nearest_positioned_ancestor =
- positioning_context.collects_for_nearest_positioned_ancestor();
let mut layout_results: Vec<(Fragment, PositioningContext)> =
Vec::with_capacity(child_boxes.len());
child_boxes
.par_iter()
.map(|child_box| {
- let mut child_positioning_context =
- PositioningContext::new_for_subtree(collects_for_nearest_positioned_ancestor);
+ let mut child_positioning_context = PositioningContext::default();
let fragment = child_box.borrow().layout(
layout_context,
&mut child_positioning_context,
diff --git a/components/layout/flow/root.rs b/components/layout/flow/root.rs
index c6498eeed63..bb9ff1d337a 100644
--- a/components/layout/flow/root.rs
+++ b/components/layout/flow/root.rs
@@ -385,8 +385,7 @@ impl BoxTree {
style,
};
- let mut positioning_context =
- PositioningContext::new_for_containing_block_for_all_descendants();
+ let mut positioning_context = PositioningContext::default();
let independent_layout = self.root.layout(
layout_context,
&mut positioning_context,
diff --git a/components/layout/formatting_contexts.rs b/components/layout/formatting_contexts.rs
index 4661c44592c..4982d0dae1a 100644
--- a/components/layout/formatting_contexts.rs
+++ b/components/layout/formatting_contexts.rs
@@ -295,10 +295,7 @@ impl IndependentNonReplacedContents {
);
}
- let mut child_positioning_context = PositioningContext::new_for_subtree(
- positioning_context.collects_for_nearest_positioned_ancestor(),
- );
-
+ let mut child_positioning_context = PositioningContext::default();
let result = self.layout_without_caching(
layout_context,
&mut child_positioning_context,
diff --git a/components/layout/positioned.rs b/components/layout/positioned.rs
index 6bfe2af87ef..ff361396fa3 100644
--- a/components/layout/positioned.rs
+++ b/components/layout/positioned.rs
@@ -43,16 +43,6 @@ pub(crate) struct AbsolutelyPositionedBox {
}
#[derive(Clone, MallocSizeOf)]
-pub(crate) struct PositioningContext {
- for_nearest_positioned_ancestor: Option<Vec<HoistedAbsolutelyPositionedBox>>,
-
- // For nearest `containing block for all descendants` as defined by the CSS transforms
- // spec.
- // https://www.w3.org/TR/css-transforms-1/#containing-block-for-all-descendants
- for_nearest_containing_block_for_all_descendants: Vec<HoistedAbsolutelyPositionedBox>,
-}
-
-#[derive(Clone, MallocSizeOf)]
pub(crate) struct HoistedAbsolutelyPositionedBox {
absolutely_positioned_box: ArcRefCell<AbsolutelyPositionedBox>,
@@ -104,55 +94,26 @@ impl AbsolutelyPositionedBox {
}
}
-impl IndependentFormattingContext {
- #[inline]
- pub(crate) fn new_positioning_context(&self) -> Option<PositioningContext> {
- self.base.new_positioning_context()
- }
-}
-
-impl LayoutBoxBase {
- #[inline]
- pub(crate) fn new_positioning_context(&self) -> Option<PositioningContext> {
- PositioningContext::new_for_style(&self.style, &self.base_fragment_info.flags)
- }
+#[derive(Clone, Default, MallocSizeOf)]
+pub(crate) struct PositioningContext {
+ absolutes: Vec<HoistedAbsolutelyPositionedBox>,
}
impl PositioningContext {
- pub(crate) fn new_for_containing_block_for_all_descendants() -> Self {
- Self {
- for_nearest_positioned_ancestor: None,
- for_nearest_containing_block_for_all_descendants: Vec::new(),
- }
- }
-
- /// Create a [PositioningContext] to use for laying out a subtree. The idea is that
- /// when subtree layout is finished, the newly hoisted boxes can be processed
- /// (normally adjusting their static insets) and then appended to the parent
- /// [PositioningContext].
- pub(crate) fn new_for_subtree(collects_for_nearest_positioned_ancestor: bool) -> Self {
- Self {
- for_nearest_positioned_ancestor: if collects_for_nearest_positioned_ancestor {
- Some(Vec::new())
- } else {
- None
- },
- for_nearest_containing_block_for_all_descendants: Vec::new(),
- }
- }
-
- pub(crate) fn collects_for_nearest_positioned_ancestor(&self) -> bool {
- self.for_nearest_positioned_ancestor.is_some()
+ #[inline]
+ pub(crate) fn new_for_layout_box_base(layout_box_base: &LayoutBoxBase) -> Option<Self> {
+ Self::new_for_style_and_fragment_flags(
+ &layout_box_base.style,
+ &layout_box_base.base_fragment_info.flags,
+ )
}
- fn new_for_style(style: &ComputedValues, flags: &FragmentFlags) -> Option<Self> {
- if style.establishes_containing_block_for_all_descendants(*flags) {
- Some(Self::new_for_containing_block_for_all_descendants())
- } else if style.establishes_containing_block_for_absolute_descendants(*flags) {
- Some(Self {
- for_nearest_positioned_ancestor: Some(Vec::new()),
- for_nearest_containing_block_for_all_descendants: Vec::new(),
- })
+ fn new_for_style_and_fragment_flags(
+ style: &ComputedValues,
+ flags: &FragmentFlags,
+ ) -> Option<Self> {
+ if style.establishes_containing_block_for_absolute_descendants(*flags) {
+ Some(Self::default())
} else {
None
}
@@ -195,20 +156,9 @@ impl PositioningContext {
offset: &PhysicalVec<Au>,
index: PositioningContextLength,
) {
- if let Some(hoisted_boxes) = self.for_nearest_positioned_ancestor.as_mut() {
- hoisted_boxes
- .iter_mut()
- .skip(index.for_nearest_positioned_ancestor)
- .for_each(|hoisted_fragment| {
- hoisted_fragment
- .fragment
- .borrow_mut()
- .adjust_offsets(offset)
- })
- }
- self.for_nearest_containing_block_for_all_descendants
+ self.absolutes
.iter_mut()
- .skip(index.for_nearest_containing_block_for_all_descendants)
+ .skip(index.0)
.for_each(|hoisted_fragment| {
hoisted_fragment
.fragment
@@ -227,19 +177,23 @@ impl PositioningContext {
base: &LayoutBoxBase,
fragment_layout_fn: impl FnOnce(&mut Self) -> BoxFragment,
) -> BoxFragment {
- // Try to create a context, but if one isn't necessary, simply create the fragment
- // using the given closure and the current `PositioningContext`.
- let mut new_context = match base.new_positioning_context() {
- Some(new_context) => new_context,
- None => return fragment_layout_fn(self),
- };
+ // If a new `PositioningContext` isn't necessary, simply create the fragment using
+ // the given closure and the current `PositioningContext`.
+ let establishes_containing_block_for_absolutes = base
+ .style
+ .establishes_containing_block_for_absolute_descendants(base.base_fragment_info.flags);
+ if !establishes_containing_block_for_absolutes {
+ return fragment_layout_fn(self);
+ }
+ let mut new_context = PositioningContext::default();
let mut new_fragment = fragment_layout_fn(&mut new_context);
- new_context.layout_collected_children(layout_context, &mut new_fragment);
- // If the new context has any hoisted boxes for the nearest containing block for
- // pass them up the tree.
+ // Lay out all of the absolutely positioned children for this fragment, and, if it
+ // isn't a containing block for fixed elements, then pass those up to the parent.
+ new_context.layout_collected_children(layout_context, &mut new_fragment);
self.append(new_context);
+
if base.style.clone_position() == Position::Relative {
new_fragment.content_rect.origin += relative_adjustement(&base.style, containing_block)
.to_physical_vector(containing_block.style.writing_mode)
@@ -248,13 +202,61 @@ impl PositioningContext {
new_fragment
}
+ fn take_boxes_for_fragment(
+ &mut self,
+ new_fragment: &BoxFragment,
+ boxes_to_layout_out: &mut Vec<HoistedAbsolutelyPositionedBox>,
+ boxes_to_continue_hoisting_out: &mut Vec<HoistedAbsolutelyPositionedBox>,
+ ) {
+ debug_assert!(
+ new_fragment
+ .style
+ .establishes_containing_block_for_absolute_descendants(new_fragment.base.flags)
+ );
+
+ if new_fragment
+ .style
+ .establishes_containing_block_for_all_descendants(new_fragment.base.flags)
+ {
+ boxes_to_layout_out.append(&mut self.absolutes);
+ return;
+ }
+
+ // TODO: This could potentially use `extract_if` when that is stabilized.
+ let (mut boxes_to_layout, mut boxes_to_continue_hoisting) = self
+ .absolutes
+ .drain(..)
+ .partition(|hoisted_box| hoisted_box.position() != Position::Fixed);
+ boxes_to_layout_out.append(&mut boxes_to_layout);
+ boxes_to_continue_hoisting_out.append(&mut boxes_to_continue_hoisting);
+ }
+
// Lay out the hoisted boxes collected into this `PositioningContext` and add them
// to the given `BoxFragment`.
- pub fn layout_collected_children(
+ pub(crate) fn layout_collected_children(
&mut self,
layout_context: &LayoutContext,
new_fragment: &mut BoxFragment,
) {
+ if self.absolutes.is_empty() {
+ return;
+ }
+
+ // Sometimes we create temporary PositioningContexts just to collect hoisted absolutes and
+ // then these are processed later. In that case and if this fragment doesn't establish a
+ // containing block for absolutes at all, we just do nothing. All hoisted fragments will
+ // later be passed up to a parent PositioningContext.
+ //
+ // Handling this case here, when the PositioningContext is completely ineffectual other than
+ // as a temporary container for hoisted boxes, means that callers can execute less conditional
+ // code.
+ if !new_fragment
+ .style
+ .establishes_containing_block_for_absolute_descendants(new_fragment.base.flags)
+ {
+ return;
+ }
+
let padding_rect = PhysicalRect::new(
// Ignore the content rect’s position in its own containing block:
PhysicalPoint::origin(),
@@ -268,83 +270,58 @@ impl PositioningContext {
style: &new_fragment.style,
};
- let take_hoisted_boxes_pending_layout =
- |context: &mut Self| match context.for_nearest_positioned_ancestor.as_mut() {
- Some(fragments) => mem::take(fragments),
- None => mem::take(&mut context.for_nearest_containing_block_for_all_descendants),
- };
+ let mut fixed_position_boxes_to_hoist = Vec::new();
+ let mut boxes_to_layout = Vec::new();
+ self.take_boxes_for_fragment(
+ new_fragment,
+ &mut boxes_to_layout,
+ &mut fixed_position_boxes_to_hoist,
+ );
- // Loop because it’s possible that we discover (the static position of)
- // more absolutely-positioned boxes while doing layout for others.
- let mut hoisted_boxes = take_hoisted_boxes_pending_layout(self);
- let mut laid_out_child_fragments = Vec::new();
- while !hoisted_boxes.is_empty() {
+ // Laying out a `position: absolute` child (which only establishes a containing block for
+ // `position: absolute` descendants) can result in more `position: fixed` descendants
+ // collecting in `self.absolutes`. We need to loop here in order to keep either laying them
+ // out or putting them into `fixed_position_boxes_to_hoist`. We know there aren't any more
+ // when `self.absolutes` is empty.
+ while !boxes_to_layout.is_empty() {
HoistedAbsolutelyPositionedBox::layout_many(
layout_context,
- &mut hoisted_boxes,
- &mut laid_out_child_fragments,
- &mut self.for_nearest_containing_block_for_all_descendants,
+ std::mem::take(&mut boxes_to_layout),
+ &mut new_fragment.children,
+ &mut self.absolutes,
&containing_block,
new_fragment.padding,
);
- hoisted_boxes = take_hoisted_boxes_pending_layout(self);
- }
- new_fragment.children.extend(laid_out_child_fragments);
- }
-
- pub(crate) fn push(&mut self, box_: HoistedAbsolutelyPositionedBox) {
- if let Some(nearest) = &mut self.for_nearest_positioned_ancestor {
- let position = box_
- .absolutely_positioned_box
- .borrow()
- .context
- .style()
- .clone_position();
- match position {
- Position::Fixed => {}, // fall through
- Position::Absolute => return nearest.push(box_),
- Position::Static | Position::Relative | Position::Sticky => unreachable!(),
- }
+ self.take_boxes_for_fragment(
+ new_fragment,
+ &mut boxes_to_layout,
+ &mut fixed_position_boxes_to_hoist,
+ );
}
- self.for_nearest_containing_block_for_all_descendants
- .push(box_)
+
+ // We replace here instead of simply preserving these in `take_boxes_for_fragment`
+ // so that we don't have to continually re-iterate over them when laying out in the
+ // loop above.
+ self.absolutes = fixed_position_boxes_to_hoist;
}
- pub(crate) fn is_empty(&self) -> bool {
- self.for_nearest_containing_block_for_all_descendants
- .is_empty() &&
- self.for_nearest_positioned_ancestor
- .as_ref()
- .is_none_or(|vector| vector.is_empty())
+ pub(crate) fn push(&mut self, hoisted_box: HoistedAbsolutelyPositionedBox) {
+ debug_assert!(matches!(
+ hoisted_box.position(),
+ Position::Absolute | Position::Fixed
+ ));
+ self.absolutes.push(hoisted_box);
}
- pub(crate) fn append(&mut self, other: Self) {
- if other.is_empty() {
+ pub(crate) fn append(&mut self, mut other: Self) {
+ if other.absolutes.is_empty() {
return;
}
-
- vec_append_owned(
- &mut self.for_nearest_containing_block_for_all_descendants,
- other.for_nearest_containing_block_for_all_descendants,
- );
-
- match (
- self.for_nearest_positioned_ancestor.as_mut(),
- other.for_nearest_positioned_ancestor,
- ) {
- (Some(us), Some(them)) => vec_append_owned(us, them),
- (None, Some(them)) => {
- // This is the case where we have laid out the absolute children in a containing
- // block for absolutes and we then are passing up the fixed-position descendants
- // to the containing block for all descendants.
- vec_append_owned(
- &mut self.for_nearest_containing_block_for_all_descendants,
- them,
- );
- },
- (None, None) => {},
- _ => unreachable!(),
+ if self.absolutes.is_empty() {
+ self.absolutes = other.absolutes;
+ } else {
+ self.absolutes.append(&mut other.absolutes)
}
}
@@ -354,19 +331,16 @@ impl PositioningContext {
initial_containing_block: &DefiniteContainingBlock,
fragments: &mut Vec<Fragment>,
) {
- debug_assert!(self.for_nearest_positioned_ancestor.is_none());
-
- // Loop because it’s possible that we discover (the static position of)
- // more absolutely-positioned boxes while doing layout for others.
- while !self
- .for_nearest_containing_block_for_all_descendants
- .is_empty()
- {
+ // Laying out a `position: absolute` child (which only establishes a containing block for
+ // `position: absolute` descendants) can result in more `position: fixed` descendants
+ // collecting in `self.absolutes`. We need to loop here in order to keep laying them out. We
+ // know there aren't any more when `self.absolutes` is empty.
+ while !self.absolutes.is_empty() {
HoistedAbsolutelyPositionedBox::layout_many(
layout_context,
- &mut mem::take(&mut self.for_nearest_containing_block_for_all_descendants),
+ mem::take(&mut self.absolutes),
fragments,
- &mut self.for_nearest_containing_block_for_all_descendants,
+ &mut self.absolutes,
initial_containing_block,
Default::default(),
)
@@ -375,58 +349,46 @@ impl PositioningContext {
/// Get the length of this [PositioningContext].
pub(crate) fn len(&self) -> PositioningContextLength {
- PositioningContextLength {
- for_nearest_positioned_ancestor: self
- .for_nearest_positioned_ancestor
- .as_ref()
- .map_or(0, |vec| vec.len()),
- for_nearest_containing_block_for_all_descendants: self
- .for_nearest_containing_block_for_all_descendants
- .len(),
- }
+ PositioningContextLength(self.absolutes.len())
}
/// Truncate this [PositioningContext] to the given [PositioningContextLength]. This
/// is useful for "unhoisting" boxes in this context and returning it to the state at
/// the time that [`PositioningContext::len()`] was called.
pub(crate) fn truncate(&mut self, length: &PositioningContextLength) {
- if let Some(vec) = self.for_nearest_positioned_ancestor.as_mut() {
- vec.truncate(length.for_nearest_positioned_ancestor);
- }
- self.for_nearest_containing_block_for_all_descendants
- .truncate(length.for_nearest_containing_block_for_all_descendants);
+ self.absolutes.truncate(length.0)
}
}
/// A data structure which stores the size of a positioning context.
#[derive(Clone, Copy, Debug, PartialEq)]
-pub(crate) struct PositioningContextLength {
- /// The number of boxes that will be hoisted the the nearest positioned ancestor for
- /// layout.
- for_nearest_positioned_ancestor: usize,
- /// The number of boxes that will be hoisted the the nearest ancestor which
- /// establishes a containing block for all descendants for layout.
- for_nearest_containing_block_for_all_descendants: usize,
-}
+pub(crate) struct PositioningContextLength(usize);
impl Zero for PositioningContextLength {
fn zero() -> Self {
- PositioningContextLength {
- for_nearest_positioned_ancestor: 0,
- for_nearest_containing_block_for_all_descendants: 0,
- }
+ Self(0)
}
fn is_zero(&self) -> bool {
- self.for_nearest_positioned_ancestor == 0 &&
- self.for_nearest_containing_block_for_all_descendants == 0
+ self.0.is_zero()
}
}
impl HoistedAbsolutelyPositionedBox {
+ fn position(&self) -> Position {
+ let position = self
+ .absolutely_positioned_box
+ .borrow()
+ .context
+ .style()
+ .clone_position();
+ assert!(position == Position::Fixed || position == Position::Absolute);
+ position
+ }
+
pub(crate) fn layout_many(
layout_context: &LayoutContext,
- boxes: &mut [Self],
+ mut boxes: Vec<Self>,
fragments: &mut Vec<Fragment>,
for_nearest_containing_block_for_all_descendants: &mut Vec<HoistedAbsolutelyPositionedBox>,
containing_block: &DefiniteContainingBlock,
@@ -473,7 +435,7 @@ impl HoistedAbsolutelyPositionedBox {
pub(crate) fn layout(
&mut self,
layout_context: &LayoutContext,
- for_nearest_containing_block_for_all_descendants: &mut Vec<HoistedAbsolutelyPositionedBox>,
+ hoisted_absolutes_from_children: &mut Vec<HoistedAbsolutelyPositionedBox>,
containing_block: &DefiniteContainingBlock,
containing_block_padding: PhysicalSides<Au>,
) -> Fragment {
@@ -596,7 +558,7 @@ impl HoistedAbsolutelyPositionedBox {
.sizes
}));
- let mut positioning_context = context.new_positioning_context().unwrap();
+ let mut positioning_context = PositioningContext::default();
let mut new_fragment = {
let content_size: LogicalVec2<Au>;
let fragments;
@@ -709,6 +671,10 @@ impl HoistedAbsolutelyPositionedBox {
)
.with_specific_layout_info(specific_layout_info)
};
+
+ // This is an absolutely positioned element, which means it also establishes a
+ // containing block for absolutes. We lay out any absolutely positioned children
+ // here and pass the rest to `hoisted_absolutes_from_children.`
positioning_context.layout_collected_children(layout_context, &mut new_fragment);
// Any hoisted boxes that remain in this positioning context are going to be hoisted
@@ -721,8 +687,7 @@ impl HoistedAbsolutelyPositionedBox {
PositioningContextLength::zero(),
);
- for_nearest_containing_block_for_all_descendants
- .extend(positioning_context.for_nearest_containing_block_for_all_descendants);
+ hoisted_absolutes_from_children.extend(positioning_context.absolutes);
let fragment = Fragment::Box(ArcRefCell::new(new_fragment));
context.base.set_fragment(fragment.clone());
@@ -1024,14 +989,6 @@ impl AbsoluteAxisSolver<'_> {
}
}
-fn vec_append_owned<T>(a: &mut Vec<T>, mut b: Vec<T>) {
- if a.is_empty() {
- *a = b
- } else {
- a.append(&mut b)
- }
-}
-
/// <https://drafts.csswg.org/css2/visuren.html#relative-positioning>
pub(crate) fn relative_adjustement(
style: &ComputedValues,
diff --git a/components/layout/style_ext.rs b/components/layout/style_ext.rs
index 023db6b07f1..68a4481a2be 100644
--- a/components/layout/style_ext.rs
+++ b/components/layout/style_ext.rs
@@ -712,15 +712,19 @@ impl ComputedValuesExt for ComputedValues {
// From <https://www.w3.org/TR/css-transforms-1/#transform-rendering>
// > For elements whose layout is governed by the CSS box model, any value other than
// > `none` for the `transform` property results in the creation of a stacking context.
+ //
+ // From <https://www.w3.org/TR/css-transforms-2/#individual-transforms>
+ // > all other values […] create a stacking context and containing block for all
+ // > descendants, per usual for transforms.
+ //
+ // From <https://www.w3.org/TR/css-transforms-2/#perspective-property>
+ // > any value other than none establishes a stacking context.
+ //
// From <https://www.w3.org/TR/css-transforms-2/#transform-style-property>
// > A computed value of `preserve-3d` for `transform-style` on a transformable element
// > establishes both a stacking context and a containing block for all descendants.
- // From <https://www.w3.org/TR/css-transforms-2/#perspective-property>
- // > any value other than none establishes a stacking context.
- // TODO: handle individual transform properties (`translate`, `scale` and `rotate`).
- // <https://www.w3.org/TR/css-transforms-2/#individual-transforms>
if self.is_transformable(fragment_flags) &&
- (!self.get_box().transform.0.is_empty() ||
+ (self.has_transform_or_perspective_style() ||
self.get_box().transform_style == ComputedTransformStyle::Preserve3d ||
will_change_bits
.intersects(WillChangeBits::TRANSFORM | WillChangeBits::PERSPECTIVE))
diff --git a/components/layout/table/layout.rs b/components/layout/table/layout.rs
index 0cbe3e9ca76..2efe339837e 100644
--- a/components/layout/table/layout.rs
+++ b/components/layout/table/layout.rs
@@ -1068,7 +1068,6 @@ impl<'a> TableLayout<'a> {
&mut self,
layout_context: &LayoutContext,
containing_block_for_table: &ContainingBlock,
- parent_positioning_context: &mut PositioningContext,
) {
self.cells_laid_out = self
.table
@@ -1076,30 +1075,6 @@ impl<'a> TableLayout<'a> {
.par_iter()
.enumerate()
.map(|(row_index, row_slots)| {
- // When building the PositioningContext for this cell, we want it to have the same
- // configuration for whatever PositioningContext the contents are ultimately added to.
- let collect_for_nearest_positioned_ancestor = parent_positioning_context
- .collects_for_nearest_positioned_ancestor() ||
- self.table.rows.get(row_index).is_some_and(|row| {
- let row = row.borrow();
- let row_group_collects_for_nearest_positioned_ancestor =
- row.group_index.is_some_and(|group_index| {
- self.table.row_groups[group_index]
- .borrow()
- .base
- .style
- .establishes_containing_block_for_absolute_descendants(
- FragmentFlags::empty(),
- )
- });
- row_group_collects_for_nearest_positioned_ancestor ||
- row.base
- .style
- .establishes_containing_block_for_absolute_descendants(
- FragmentFlags::empty(),
- )
- });
-
row_slots
.par_iter()
.enumerate()
@@ -1141,10 +1116,7 @@ impl<'a> TableLayout<'a> {
style: &cell.base.style,
};
- let mut positioning_context = PositioningContext::new_for_subtree(
- collect_for_nearest_positioned_ancestor,
- );
-
+ let mut positioning_context = PositioningContext::default();
let layout = cell.contents.layout(
layout_context,
&mut positioning_context,
@@ -1503,7 +1475,6 @@ impl<'a> TableLayout<'a> {
layout_context: &LayoutContext,
parent_positioning_context: &mut PositioningContext,
) -> BoxFragment {
- let mut positioning_context = caption.context.new_positioning_context();
let containing_block = &ContainingBlock {
size: ContainingBlockSize {
inline: self.table_width + self.pbm.padding_border_sums.inline,
@@ -1517,6 +1488,8 @@ impl<'a> TableLayout<'a> {
// stretch block size. https://drafts.csswg.org/css-sizing-4/#stretch-fit-sizing
let ignore_block_margins_for_stretch = LogicalSides1D::new(false, false);
+ let mut positioning_context =
+ PositioningContext::new_for_layout_box_base(&caption.context.base);
let mut box_fragment = caption.context.layout_in_flow_block_level(
layout_context,
positioning_context
@@ -1769,11 +1742,7 @@ impl<'a> TableLayout<'a> {
) -> BoxFragment {
self.distributed_column_widths =
Self::distribute_width_to_columns(self.assignable_width, &self.columns);
- self.layout_cells_in_row(
- layout_context,
- containing_block_for_children,
- positioning_context,
- );
+ self.layout_cells_in_row(layout_context, containing_block_for_children);
let table_writing_mode = containing_block_for_children.style.writing_mode;
let first_layout_row_heights = self.do_first_row_layout(table_writing_mode);
self.compute_table_height_and_final_row_heights(
@@ -2325,7 +2294,7 @@ impl<'a> RowFragmentLayout<'a> {
Self {
row: table_row,
rect,
- positioning_context: table_row.base.new_positioning_context(),
+ positioning_context: PositioningContext::new_for_layout_box_base(&table_row.base),
containing_block,
fragments: Vec::new(),
}
@@ -2379,11 +2348,11 @@ impl<'a> RowFragmentLayout<'a> {
if let Some(mut row_positioning_context) = self.positioning_context.take() {
row_positioning_context.layout_collected_children(layout_context, &mut row_fragment);
- let positioning_context = row_group_fragment_layout
+ let parent_positioning_context = row_group_fragment_layout
.as_mut()
.and_then(|layout| layout.positioning_context.as_mut())
.unwrap_or(table_positioning_context);
- positioning_context.append(row_positioning_context);
+ parent_positioning_context.append(row_positioning_context);
}
let fragment = Fragment::Box(ArcRefCell::new(row_fragment));
@@ -2410,7 +2379,7 @@ impl RowGroupFragmentLayout {
let row_group = row_group.borrow();
(
dimensions.get_row_group_rect(&row_group),
- row_group.base.new_positioning_context(),
+ PositioningContext::new_for_layout_box_base(&row_group.base),
)
};
Self {
diff --git a/components/layout/taffy/layout.rs b/components/layout/taffy/layout.rs
index 3777c902053..a5838c1bd65 100644
--- a/components/layout/taffy/layout.rs
+++ b/components/layout/taffy/layout.rs
@@ -29,7 +29,7 @@ use crate::geom::{
use crate::layout_box_base::CacheableLayoutResult;
use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
use crate::sizing::{ComputeInlineContentSizes, ContentSizes, InlineContentSizesResult};
-use crate::style_ext::{ComputedValuesExt, LayoutStyle};
+use crate::style_ext::LayoutStyle;
use crate::{ConstraintSpace, ContainingBlock, ContainingBlockSize};
const DUMMY_NODE_ID: taffy::NodeId = taffy::NodeId::new(u64::MAX);
@@ -250,29 +250,15 @@ impl taffy::LayoutPartialTree for TaffyContainerContext<'_> {
},
style,
};
- let layout = {
- let mut child_positioning_context = independent_context
- .new_positioning_context()
- .unwrap_or_else(|| {
- PositioningContext::new_for_subtree(
- self.positioning_context
- .collects_for_nearest_positioned_ancestor(),
- )
- });
-
- let layout = non_replaced.layout_without_caching(
- self.layout_context,
- &mut child_positioning_context,
- &content_box_size_override,
- containing_block,
- false, /* depends_on_block_constraints */
- );
- // Store layout data on child for later access
- child.positioning_context = child_positioning_context;
-
- layout
- };
+ child.positioning_context = PositioningContext::default();
+ let layout = non_replaced.layout_without_caching(
+ self.layout_context,
+ &mut child.positioning_context,
+ &content_box_size_override,
+ containing_block,
+ false, /* depends_on_block_constraints */
+ );
child.child_fragments = layout.fragments;
self.child_specific_layout_infos[usize::from(node_id)] =
@@ -373,8 +359,7 @@ impl ComputeInlineContentSizes for TaffyContainer {
let mut grid_context = TaffyContainerContext {
layout_context,
- positioning_context:
- &mut PositioningContext::new_for_containing_block_for_all_descendants(),
+ positioning_context: &mut PositioningContext::default(),
content_box_size_override: containing_block,
style,
source_child_nodes: &self.children,
@@ -540,17 +525,6 @@ impl TaffyContainer {
let child_specific_layout_info: Option<SpecificLayoutInfo> =
std::mem::take(&mut container_ctx.child_specific_layout_infos[child_id]);
- let establishes_containing_block_for_absolute_descendants =
- if let TaffyItemBoxInner::InFlowBox(independent_box) = &child.taffy_level_box {
- child
- .style
- .establishes_containing_block_for_absolute_descendants(
- independent_box.base_fragment_info().flags,
- )
- } else {
- false
- };
-
let fragment = match &mut child.taffy_level_box {
TaffyItemBoxInner::InFlowBox(independent_box) => {
let mut fragment_info = independent_box.base_fragment_info();
@@ -573,29 +547,21 @@ impl TaffyContainer {
})
.with_specific_layout_info(child_specific_layout_info);
- if establishes_containing_block_for_absolute_descendants {
- child.positioning_context.layout_collected_children(
- container_ctx.layout_context,
- &mut box_fragment,
- );
- }
-
- let fragment = Fragment::Box(ArcRefCell::new(box_fragment));
-
+ child.positioning_context.layout_collected_children(
+ container_ctx.layout_context,
+ &mut box_fragment,
+ );
child
.positioning_context
- .adjust_static_position_of_hoisted_fragments(
- &fragment,
+ .adjust_static_position_of_hoisted_fragments_with_offset(
+ &box_fragment.content_rect.origin.to_vector(),
PositioningContextLength::zero(),
);
- let child_positioning_context = std::mem::replace(
- &mut child.positioning_context,
- PositioningContext::new_for_containing_block_for_all_descendants(),
- );
container_ctx
.positioning_context
- .append(child_positioning_context);
- fragment
+ .append(std::mem::take(&mut child.positioning_context));
+
+ Fragment::Box(ArcRefCell::new(box_fragment))
},
TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(abs_pos_box) => {
fn resolve_alignment(value: AlignFlags, auto: AlignFlags) -> AlignFlags {
diff --git a/components/layout/taffy/mod.rs b/components/layout/taffy/mod.rs
index 55a678cd89a..b1ff753ea78 100644
--- a/components/layout/taffy/mod.rs
+++ b/components/layout/taffy/mod.rs
@@ -110,7 +110,7 @@ impl TaffyItemBox {
Self {
taffy_layout: Default::default(),
child_fragments: Vec::new(),
- positioning_context: PositioningContext::new_for_containing_block_for_all_descendants(),
+ positioning_context: PositioningContext::default(),
style,
taffy_level_box: inner,
}
@@ -118,8 +118,7 @@ impl TaffyItemBox {
pub(crate) fn invalidate_cached_fragment(&mut self) {
self.taffy_layout = Default::default();
- self.positioning_context =
- PositioningContext::new_for_containing_block_for_all_descendants();
+ self.positioning_context = PositioningContext::default();
match self.taffy_level_box {
TaffyItemBoxInner::InFlowBox(ref independent_formatting_context) => {
independent_formatting_context
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-03 20:24:51 +0000