mirror of
https://github.com/servo/servo.git
synced 2025-06-25 17:44:33 +01:00
0f61361e27
Previously, layout was handling scrollable overflow and srolling area calculation separately, only excluding the "unreachable scrollable overflow region" at the last step. In addition, `position: absolute` was not included in scrollable overflow calculation. This change combines the two concepts into a single scrollable overflow calculation and starts taking into account `position: absolute`. Finally, `BoxFragment::scrollable_overflow_for_parent` is converted to use early returns which reduces the amount of indentation. Fixes #35928. Fixes #37204. Testing: This causes some WPT test to pass, but also two to start failing: - `/css/css-masking/clip-path/clip-path-fixed-scroll.html`: This seems to fail because script is scrolling past the boundaries of the document. This is a failure that was uncovered by the fixed element now being added to the page's scroll area. - `/css/css-overflow/overflow-outside-padding.html`: One test has started to fail here because now the absolutely positioned element is included in the scroll area, and I think there is an issue with how we are placing RTL items with negative margins. Signed-off-by: Martin Robinson <mrobinson@igalia.com>
523 lines
22 KiB
Rust
523 lines
22 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use app_units::{Au, MAX_AU, MIN_AU};
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use atomic_refcell::AtomicRefCell;
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use base::print_tree::PrintTree;
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use malloc_size_of_derive::MallocSizeOf;
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use servo_arc::Arc as ServoArc;
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use servo_geometry::f32_rect_to_au_rect;
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use style::Zero;
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use style::computed_values::border_collapse::T as BorderCollapse;
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use style::computed_values::overflow_x::T as ComputedOverflow;
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use style::computed_values::position::T as ComputedPosition;
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use style::logical_geometry::WritingMode;
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use style::properties::ComputedValues;
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use style::values::specified::box_::DisplayOutside;
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use super::{BaseFragment, BaseFragmentInfo, CollapsedBlockMargins, Fragment, FragmentFlags};
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use crate::SharedStyle;
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use crate::display_list::ToWebRender;
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use crate::formatting_contexts::Baselines;
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use crate::geom::{
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AuOrAuto, LengthPercentageOrAuto, PhysicalPoint, PhysicalRect, PhysicalSides, ToLogical,
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};
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use crate::style_ext::ComputedValuesExt;
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use crate::table::SpecificTableGridInfo;
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use crate::taffy::SpecificTaffyGridInfo;
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/// Describes how a [`BoxFragment`] paints its background.
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#[derive(MallocSizeOf)]
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pub(crate) enum BackgroundMode {
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/// Draw the normal [`BoxFragment`] background as well as the extra backgrounds
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/// based on the style and positioning rectangles in this data structure.
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Extra(Vec<ExtraBackground>),
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/// Do not draw a background for this Fragment. This is used for elements like
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/// table tracks and table track groups, which rely on cells to paint their
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/// backgrounds.
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None,
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/// Draw the background normally, getting information from the Fragment style.
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Normal,
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}
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#[derive(MallocSizeOf)]
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pub(crate) struct ExtraBackground {
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pub style: SharedStyle,
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pub rect: PhysicalRect<Au>,
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}
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#[derive(Clone, Debug, MallocSizeOf)]
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pub(crate) enum SpecificLayoutInfo {
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Grid(Box<SpecificTaffyGridInfo>),
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TableCellWithCollapsedBorders,
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TableGridWithCollapsedBorders(Box<SpecificTableGridInfo>),
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TableWrapper,
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}
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#[derive(MallocSizeOf)]
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pub(crate) struct BoxFragment {
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pub base: BaseFragment,
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pub style: ServoArc<ComputedValues>,
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pub children: Vec<Fragment>,
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/// The content rect of this fragment in the parent fragment's content rectangle. This
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/// does not include padding, border, or margin -- it only includes content.
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pub content_rect: PhysicalRect<Au>,
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/// This [`BoxFragment`]'s containing block rectangle in coordinates relative to
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/// the initial containing block, but not taking into account any transforms.
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pub cumulative_containing_block_rect: PhysicalRect<Au>,
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pub padding: PhysicalSides<Au>,
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pub border: PhysicalSides<Au>,
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pub margin: PhysicalSides<Au>,
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/// When the `clear` property is not set to `none`, it may introduce clearance.
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/// Clearance is some extra spacing that is added above the top margin,
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/// so that the element doesn't overlap earlier floats in the same BFC.
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/// The presence of clearance prevents the top margin from collapsing with
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/// earlier margins or with the bottom margin of the parent block.
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/// <https://drafts.csswg.org/css2/#clearance>
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pub clearance: Option<Au>,
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/// When this [`BoxFragment`] is for content that has a baseline, this tracks
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/// the first and last baselines of that content. This is used to propagate baselines
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/// to things such as tables and inline formatting contexts.
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baselines: Baselines,
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block_margins_collapsed_with_children: Option<Box<CollapsedBlockMargins>>,
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/// The scrollable overflow of this box fragment in the same coordiante system as
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/// [`Self::content_rect`] ie a rectangle within the parent fragment's content
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/// rectangle. This does not take into account any transforms this fragment applies.
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/// This is handled when calling [`Self::scrollable_overflow_for_parent`].
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scrollable_overflow: Option<PhysicalRect<Au>>,
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/// The resolved box insets if this box is `position: sticky`. These are calculated
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/// during `StackingContextTree` construction because they rely on the size of the
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/// scroll container.
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pub(crate) resolved_sticky_insets: AtomicRefCell<Option<PhysicalSides<AuOrAuto>>>,
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pub background_mode: BackgroundMode,
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/// Additional information of from layout that could be used by Javascripts and devtools.
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pub specific_layout_info: Option<SpecificLayoutInfo>,
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}
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impl BoxFragment {
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#[allow(clippy::too_many_arguments)]
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pub fn new(
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base_fragment_info: BaseFragmentInfo,
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style: ServoArc<ComputedValues>,
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children: Vec<Fragment>,
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content_rect: PhysicalRect<Au>,
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padding: PhysicalSides<Au>,
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border: PhysicalSides<Au>,
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margin: PhysicalSides<Au>,
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clearance: Option<Au>,
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) -> BoxFragment {
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BoxFragment {
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base: base_fragment_info.into(),
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style,
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children,
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content_rect,
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cumulative_containing_block_rect: Default::default(),
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padding,
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border,
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margin,
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clearance,
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baselines: Baselines::default(),
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block_margins_collapsed_with_children: None,
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scrollable_overflow: None,
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resolved_sticky_insets: AtomicRefCell::default(),
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background_mode: BackgroundMode::Normal,
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specific_layout_info: None,
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}
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}
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pub fn with_baselines(mut self, baselines: Baselines) -> Self {
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self.baselines = baselines;
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self
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}
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/// Get the baselines for this [`BoxFragment`] if they are compatible with the given [`WritingMode`].
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/// If they are not compatible, [`Baselines::default()`] is returned.
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pub fn baselines(&self, writing_mode: WritingMode) -> Baselines {
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let mut baselines =
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if writing_mode.is_horizontal() == self.style.writing_mode.is_horizontal() {
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self.baselines
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} else {
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// If the writing mode of the container requesting baselines is not
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// compatible, ensure that the baselines established by this fragment are
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// not used.
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Baselines::default()
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};
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// From the https://drafts.csswg.org/css-align-3/#baseline-export section on "block containers":
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// > However, for legacy reasons if its baseline-source is auto (the initial
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// > value) a block-level or inline-level block container that is a scroll container
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// > always has a last baseline set, whose baselines all correspond to its block-end
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// > margin edge.
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//
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// This applies even if there is no baseline set, so we unconditionally set the value here
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// and ignore anything that is set via [`Self::with_baselines`].
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if self.style.establishes_scroll_container(self.base.flags) {
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let content_rect_size = self.content_rect.size.to_logical(writing_mode);
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let padding = self.padding.to_logical(writing_mode);
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let border = self.border.to_logical(writing_mode);
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let margin = self.margin.to_logical(writing_mode);
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baselines.last = Some(
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content_rect_size.block + padding.block_end + border.block_end + margin.block_end,
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)
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}
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baselines
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}
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pub fn add_extra_background(&mut self, extra_background: ExtraBackground) {
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match self.background_mode {
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BackgroundMode::Extra(ref mut backgrounds) => backgrounds.push(extra_background),
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_ => self.background_mode = BackgroundMode::Extra(vec![extra_background]),
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}
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}
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pub fn set_does_not_paint_background(&mut self) {
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self.background_mode = BackgroundMode::None;
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}
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pub fn with_specific_layout_info(mut self, info: Option<SpecificLayoutInfo>) -> Self {
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self.specific_layout_info = info;
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self
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}
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pub fn with_block_margins_collapsed_with_children(
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mut self,
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collapsed_margins: CollapsedBlockMargins,
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) -> Self {
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self.block_margins_collapsed_with_children = Some(collapsed_margins.into());
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self
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}
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/// Get the scrollable overflow for this [`BoxFragment`] relative to its
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/// containing block.
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pub fn scrollable_overflow(&self) -> PhysicalRect<Au> {
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self.scrollable_overflow
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.expect("Should only call `scrollable_overflow()` after calculating overflow")
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}
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/// This is an implementation of:
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/// - <https://drafts.csswg.org/css-overflow-3/#scrollable>.
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/// - <https://drafts.csswg.org/cssom-view/#scrolling-area>
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pub(crate) fn calculate_scrollable_overflow(&mut self) {
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let physical_padding_rect = self.padding_rect();
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let content_origin = self.content_rect.origin.to_vector();
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// > The scrollable overflow area is the union of:
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// > * The scroll container’s own padding box.
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// > * All line boxes directly contained by the scroll container.
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// > * The border boxes of all boxes for which it is the containing block and
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// > whose border boxes are positioned not wholly in the unreachable
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// > scrollable overflow region, accounting for transforms by projecting
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// > each box onto the plane of the element that establishes its 3D
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// > rendering context.
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// > * The margin areas of grid item and flex item boxes for which the box
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// > establishes a containing block.
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// > * The scrollable overflow areas of all of the above boxes (including zero-area
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// > boxes and accounting for transforms as described above), provided they
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// > themselves have overflow: visible (i.e. do not themselves trap the overflow)
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// > and that scrollable overflow is not already clipped (e.g. by the clip property
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// > or the contain property).
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// > * Additional padding added to the scrollable overflow rectangle as necessary
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// to enable scroll positions that satisfy the requirements of both place-content:
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// start and place-content: end alignment.
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//
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// TODO(mrobinson): Below we are handling the border box and the scrollable
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// overflow together, but from the specification it seems that if the border
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// box of an item is in the "wholly unreachable scrollable overflow region", but
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// its scrollable overflow is not, it should also be excluded.
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let scrollable_overflow = self
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.children
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.iter()
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.fold(physical_padding_rect, |acc, child| {
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let scrollable_overflow_from_child = child
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.calculate_scrollable_overflow_for_parent()
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.translate(content_origin);
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// Note that this doesn't just exclude scrollable overflow outside the
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// wholly unrechable scrollable overflow area, but also clips it. This
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// makes the resulting value more like the "scroll area" rather than the
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// "scrollable overflow."
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let scrollable_overflow_from_child = self
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.clip_wholly_unreachable_scrollable_overflow(
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scrollable_overflow_from_child,
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physical_padding_rect,
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);
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acc.union(&scrollable_overflow_from_child)
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});
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self.scrollable_overflow = Some(scrollable_overflow)
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}
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pub(crate) fn set_containing_block(&mut self, containing_block: &PhysicalRect<Au>) {
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self.cumulative_containing_block_rect = *containing_block;
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}
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pub fn offset_by_containing_block(&self, rect: &PhysicalRect<Au>) -> PhysicalRect<Au> {
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rect.translate(self.cumulative_containing_block_rect.origin.to_vector())
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}
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pub(crate) fn padding_rect(&self) -> PhysicalRect<Au> {
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self.content_rect.outer_rect(self.padding)
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}
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pub(crate) fn border_rect(&self) -> PhysicalRect<Au> {
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self.padding_rect().outer_rect(self.border)
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}
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pub(crate) fn margin_rect(&self) -> PhysicalRect<Au> {
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self.border_rect().outer_rect(self.margin)
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}
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pub(crate) fn padding_border_margin(&self) -> PhysicalSides<Au> {
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self.margin + self.border + self.padding
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}
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pub(crate) fn is_root_element(&self) -> bool {
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self.base.flags.intersects(FragmentFlags::IS_ROOT_ELEMENT)
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}
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pub(crate) fn is_body_element_of_html_element_root(&self) -> bool {
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self.base
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.flags
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.intersects(FragmentFlags::IS_BODY_ELEMENT_OF_HTML_ELEMENT_ROOT)
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}
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pub fn print(&self, tree: &mut PrintTree) {
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tree.new_level(format!(
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"Box\
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\nbase={:?}\
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\ncontent={:?}\
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\npadding rect={:?}\
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\nborder rect={:?}\
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\nmargin={:?}\
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\nclearance={:?}\
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\nscrollable_overflow={:?}\
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\nbaselines={:?}\
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\noverflow={:?}",
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self.base,
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self.content_rect,
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self.padding_rect(),
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self.border_rect(),
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self.margin,
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self.clearance,
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self.scrollable_overflow(),
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self.baselines,
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self.style.effective_overflow(self.base.flags),
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));
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for child in &self.children {
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child.print(tree);
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}
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tree.end_level();
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}
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pub(crate) fn scrollable_overflow_for_parent(&self) -> PhysicalRect<Au> {
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let mut overflow = self.border_rect();
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if !self.style.establishes_scroll_container(self.base.flags) {
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// https://www.w3.org/TR/css-overflow-3/#scrollable
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// Only include the scrollable overflow of a child box if it has overflow: visible.
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let scrollable_overflow = self.scrollable_overflow();
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let bottom_right = PhysicalPoint::new(
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overflow.max_x().max(scrollable_overflow.max_x()),
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overflow.max_y().max(scrollable_overflow.max_y()),
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);
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let overflow_style = self.style.effective_overflow(self.base.flags);
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if overflow_style.y == ComputedOverflow::Visible {
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overflow.origin.y = overflow.origin.y.min(scrollable_overflow.origin.y);
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overflow.size.height = bottom_right.y - overflow.origin.y;
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}
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if overflow_style.x == ComputedOverflow::Visible {
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overflow.origin.x = overflow.origin.x.min(scrollable_overflow.origin.x);
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overflow.size.width = bottom_right.x - overflow.origin.x;
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}
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}
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if !self
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.style
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.has_effective_transform_or_perspective(self.base.flags)
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{
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return overflow;
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}
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// <https://drafts.csswg.org/css-overflow-3/#scrollable-overflow-region>
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// > ...accounting for transforms by projecting each box onto the plane of
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// > the element that establishes its 3D rendering context. [CSS3-TRANSFORMS]
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// Both boxes and its scrollable overflow (if it is included) should be transformed accordingly.
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//
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// TODO(stevennovaryo): We are supposed to handle perspective transform and 3d
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// contexts, but it is yet to happen.
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self.calculate_transform_matrix(&self.border_rect().to_untyped())
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.and_then(|transform| {
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transform.outer_transformed_rect(&overflow.to_webrender().to_rect())
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})
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.map(|transformed_rect| f32_rect_to_au_rect(transformed_rect.to_untyped()).cast_unit())
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.unwrap_or(overflow)
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}
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/// Return the clipped the scrollable overflow based on its scroll origin, determined
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/// by overflow direction. For an element, the clip rect is the padding rect and for
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/// viewport, it is the initial containing block.
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pub(crate) fn clip_wholly_unreachable_scrollable_overflow(
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&self,
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scrollable_overflow: PhysicalRect<Au>,
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clipping_rect: PhysicalRect<Au>,
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) -> PhysicalRect<Au> {
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// From <https://drafts.csswg.org/css-overflow/#unreachable-scrollable-overflow-region>:
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// > Unless otherwise adjusted (e.g. by content alignment [css-align-3]), the area
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// > beyond the scroll origin in either axis is considered the unreachable scrollable
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// > overflow region: content rendered here is not accessible to the reader, see § 2.2
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// > Scrollable Overflow. A scroll container is said to be scrolled to its scroll
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// > origin when its scroll origin coincides with the corresponding corner of its
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// > scrollport. This scroll position, the scroll origin position, usually, but not
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// > always, coincides with the initial scroll position.
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let scrolling_direction = self.style.overflow_direction();
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let mut clipping_box = clipping_rect.to_box2d();
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if scrolling_direction.rightward {
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clipping_box.max.x = MAX_AU;
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} else {
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clipping_box.min.x = MIN_AU;
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}
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if scrolling_direction.downward {
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clipping_box.max.y = MAX_AU;
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} else {
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clipping_box.min.y = MIN_AU;
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}
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let scrollable_overflow_box = scrollable_overflow
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.to_box2d()
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.intersection_unchecked(&clipping_box);
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match scrollable_overflow_box.is_negative() {
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true => PhysicalRect::zero(),
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false => scrollable_overflow_box.to_rect(),
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}
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}
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pub(crate) fn calculate_resolved_insets_if_positioned(&self) -> PhysicalSides<AuOrAuto> {
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let position = self.style.get_box().position;
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debug_assert_ne!(
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position,
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ComputedPosition::Static,
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"Should not call this method on statically positioned box."
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);
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if let Some(resolved_sticky_insets) = *self.resolved_sticky_insets.borrow() {
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return resolved_sticky_insets;
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}
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let convert_to_au_or_auto = |sides: PhysicalSides<Au>| {
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PhysicalSides::new(
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AuOrAuto::LengthPercentage(sides.top),
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AuOrAuto::LengthPercentage(sides.right),
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AuOrAuto::LengthPercentage(sides.bottom),
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AuOrAuto::LengthPercentage(sides.left),
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)
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};
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// "A resolved value special case property like top defined in another
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// specification If the property applies to a positioned element and the
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// resolved value of the display property is not none or contents, and
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// the property is not over-constrained, then the resolved value is the
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// used value. Otherwise the resolved value is the computed value."
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// https://drafts.csswg.org/cssom/#resolved-values
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let insets = self.style.physical_box_offsets();
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let (cb_width, cb_height) = (
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self.cumulative_containing_block_rect.width(),
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self.cumulative_containing_block_rect.height(),
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);
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if position == ComputedPosition::Relative {
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let get_resolved_axis = |start: &LengthPercentageOrAuto,
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end: &LengthPercentageOrAuto,
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container_length: Au| {
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let start = start.map(|value| value.to_used_value(container_length));
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let end = end.map(|value| value.to_used_value(container_length));
|
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match (start.non_auto(), end.non_auto()) {
|
||
(None, None) => (Au::zero(), Au::zero()),
|
||
(None, Some(end)) => (-end, end),
|
||
(Some(start), None) => (start, -start),
|
||
// This is the overconstrained case, for which the resolved insets will
|
||
// simply be the computed insets.
|
||
(Some(start), Some(end)) => (start, end),
|
||
}
|
||
};
|
||
let (left, right) = get_resolved_axis(&insets.left, &insets.right, cb_width);
|
||
let (top, bottom) = get_resolved_axis(&insets.top, &insets.bottom, cb_height);
|
||
return convert_to_au_or_auto(PhysicalSides::new(top, right, bottom, left));
|
||
}
|
||
|
||
debug_assert!(position.is_absolutely_positioned());
|
||
|
||
let margin_rect = self.margin_rect();
|
||
let (top, bottom) = match (&insets.top, &insets.bottom) {
|
||
(
|
||
LengthPercentageOrAuto::LengthPercentage(top),
|
||
LengthPercentageOrAuto::LengthPercentage(bottom),
|
||
) => (
|
||
top.to_used_value(cb_height),
|
||
bottom.to_used_value(cb_height),
|
||
),
|
||
_ => (margin_rect.origin.y, cb_height - margin_rect.max_y()),
|
||
};
|
||
let (left, right) = match (&insets.left, &insets.right) {
|
||
(
|
||
LengthPercentageOrAuto::LengthPercentage(left),
|
||
LengthPercentageOrAuto::LengthPercentage(right),
|
||
) => (left.to_used_value(cb_width), right.to_used_value(cb_width)),
|
||
_ => (margin_rect.origin.x, cb_width - margin_rect.max_x()),
|
||
};
|
||
|
||
convert_to_au_or_auto(PhysicalSides::new(top, right, bottom, left))
|
||
}
|
||
|
||
/// Whether this is a non-replaced inline-level box whose inner display type is `flow`.
|
||
/// <https://drafts.csswg.org/css-display-3/#inline-box>
|
||
pub(crate) fn is_inline_box(&self) -> bool {
|
||
self.style.is_inline_box(self.base.flags)
|
||
}
|
||
|
||
/// Whether this is an atomic inline-level box.
|
||
/// <https://drafts.csswg.org/css-display-3/#atomic-inline>
|
||
pub(crate) fn is_atomic_inline_level(&self) -> bool {
|
||
self.style.get_box().display.outside() == DisplayOutside::Inline && !self.is_inline_box()
|
||
}
|
||
|
||
/// Whether this is a table wrapper box.
|
||
/// <https://www.w3.org/TR/css-tables-3/#table-wrapper-box>
|
||
pub(crate) fn is_table_wrapper(&self) -> bool {
|
||
matches!(
|
||
self.specific_layout_info,
|
||
Some(SpecificLayoutInfo::TableWrapper)
|
||
)
|
||
}
|
||
|
||
pub(crate) fn has_collapsed_borders(&self) -> bool {
|
||
match &self.specific_layout_info {
|
||
Some(SpecificLayoutInfo::TableCellWithCollapsedBorders) => true,
|
||
Some(SpecificLayoutInfo::TableGridWithCollapsedBorders(_)) => true,
|
||
Some(SpecificLayoutInfo::TableWrapper) => {
|
||
self.style.get_inherited_table().border_collapse == BorderCollapse::Collapse
|
||
},
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
pub(crate) fn block_margins_collapsed_with_children(&self) -> CollapsedBlockMargins {
|
||
match self.block_margins_collapsed_with_children.as_ref() {
|
||
Some(collapsed_block_margins) => *(collapsed_block_margins).clone(),
|
||
_ => CollapsedBlockMargins::zero(),
|
||
}
|
||
}
|
||
}
|