forked from mirrors/gecko-dev
43ec8829fb
* Add calc method to calculate formula value with parent size * Add unit test case <!-- Please describe your changes on the following line: --> Please see this issue: https://github.com/servo/servo/issues/15986 --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: --> - [x] `./mach build -d` does not report any errors - [x] `./mach test-tidy` does not report any errors - [x] These changes fix #15986 (github issue number if applicable). <!-- Either: --> - [x] There are tests for these changes OR - [ ] These changes do not require tests because _____ <!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.--> <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> Source-Repo: https://github.com/servo/servo Source-Revision: 418c3e8cc74b561c9c704da4dfdfb74681bf42a1 --HG-- extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear extra : subtree_revision : 1d48fb23022078c51f68df824ef6b0501c81b8cb
587 lines
24 KiB
Rust
587 lines
24 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 http://mozilla.org/MPL/2.0/. */
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//! Borders, padding, and margins.
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#![deny(unsafe_code)]
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use app_units::Au;
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use euclid::{Matrix4D, SideOffsets2D, Size2D};
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use fragment::Fragment;
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use std::cmp::{max, min};
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use std::fmt;
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use style::computed_values::transform::ComputedMatrix;
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use style::logical_geometry::{LogicalMargin, WritingMode};
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use style::properties::ServoComputedValues;
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use style::values::computed::{BorderRadiusSize, LengthOrPercentageOrAuto};
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use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrNone};
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/// A collapsible margin. See CSS 2.1 § 8.3.1.
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#[derive(Copy, Clone, Debug)]
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pub struct AdjoiningMargins {
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/// The value of the greatest positive margin.
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pub most_positive: Au,
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/// The actual value (not the absolute value) of the negative margin with the largest absolute
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/// value. Since this is not the absolute value, this is always zero or negative.
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pub most_negative: Au,
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}
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impl AdjoiningMargins {
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pub fn new() -> AdjoiningMargins {
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AdjoiningMargins {
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most_positive: Au(0),
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most_negative: Au(0),
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}
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}
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pub fn from_margin(margin_value: Au) -> AdjoiningMargins {
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if margin_value >= Au(0) {
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AdjoiningMargins {
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most_positive: margin_value,
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most_negative: Au(0),
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}
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} else {
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AdjoiningMargins {
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most_positive: Au(0),
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most_negative: margin_value,
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}
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}
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}
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pub fn union(&mut self, other: AdjoiningMargins) {
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self.most_positive = max(self.most_positive, other.most_positive);
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self.most_negative = min(self.most_negative, other.most_negative)
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}
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pub fn collapse(&self) -> Au {
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self.most_positive + self.most_negative
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}
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}
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/// Represents the block-start and block-end margins of a flow with collapsible margins. See CSS 2.1 § 8.3.1.
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#[derive(Copy, Clone, Debug)]
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pub enum CollapsibleMargins {
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/// Margins may not collapse with this flow.
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None(Au, Au),
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/// Both the block-start and block-end margins (specified here in that order) may collapse, but the
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/// margins do not collapse through this flow.
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Collapse(AdjoiningMargins, AdjoiningMargins),
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/// Margins collapse *through* this flow. This means, essentially, that the flow doesn’t
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/// have any border, padding, or out-of-flow (floating or positioned) content
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CollapseThrough(AdjoiningMargins),
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}
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impl CollapsibleMargins {
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pub fn new() -> CollapsibleMargins {
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CollapsibleMargins::None(Au(0), Au(0))
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}
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/// Returns the amount of margin that should be applied in a noncollapsible context. This is
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/// currently used to apply block-start margin for hypothetical boxes, since we do not collapse
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/// margins of hypothetical boxes.
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pub fn block_start_margin_for_noncollapsible_context(&self) -> Au {
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match *self {
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CollapsibleMargins::None(block_start, _) => block_start,
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CollapsibleMargins::Collapse(ref block_start, _) |
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CollapsibleMargins::CollapseThrough(ref block_start) => block_start.collapse(),
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}
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}
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pub fn block_end_margin_for_noncollapsible_context(&self) -> Au {
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match *self {
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CollapsibleMargins::None(_, block_end) => block_end,
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CollapsibleMargins::Collapse(_, ref block_end) |
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CollapsibleMargins::CollapseThrough(ref block_end) => block_end.collapse(),
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}
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}
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}
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enum FinalMarginState {
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MarginsCollapseThrough,
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BottomMarginCollapses,
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}
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pub struct MarginCollapseInfo {
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pub state: MarginCollapseState,
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pub block_start_margin: AdjoiningMargins,
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pub margin_in: AdjoiningMargins,
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}
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impl MarginCollapseInfo {
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/// TODO(#2012, pcwalton): Remove this method once `fragment` is not an `Option`.
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pub fn new() -> MarginCollapseInfo {
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MarginCollapseInfo {
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state: MarginCollapseState::AccumulatingCollapsibleTopMargin,
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block_start_margin: AdjoiningMargins::new(),
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margin_in: AdjoiningMargins::new(),
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}
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}
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pub fn initialize_block_start_margin(&mut self,
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fragment: &Fragment,
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can_collapse_block_start_margin_with_kids: bool) {
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if !can_collapse_block_start_margin_with_kids {
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self.state = MarginCollapseState::AccumulatingMarginIn
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}
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self.block_start_margin = AdjoiningMargins::from_margin(fragment.margin.block_start)
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}
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pub fn finish_and_compute_collapsible_margins(mut self,
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fragment: &Fragment,
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containing_block_size: Option<Au>,
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can_collapse_block_end_margin_with_kids: bool,
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mut may_collapse_through: bool)
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-> (CollapsibleMargins, Au) {
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let state = match self.state {
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MarginCollapseState::AccumulatingCollapsibleTopMargin => {
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may_collapse_through = may_collapse_through &&
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match fragment.style().content_block_size() {
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LengthOrPercentageOrAuto::Auto => true,
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LengthOrPercentageOrAuto::Length(Au(0)) => true,
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LengthOrPercentageOrAuto::Percentage(0.) => true,
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LengthOrPercentageOrAuto::Percentage(_) if
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containing_block_size.is_none() => true,
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_ => false,
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};
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if may_collapse_through {
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match fragment.style().min_block_size() {
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LengthOrPercentage::Length(Au(0)) | LengthOrPercentage::Percentage(0.) => {
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FinalMarginState::MarginsCollapseThrough
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},
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_ => {
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// If the fragment has non-zero min-block-size, margins may not
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// collapse through it.
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FinalMarginState::BottomMarginCollapses
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}
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}
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} else {
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// If the fragment has an explicitly specified block-size, margins may not
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// collapse through it.
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FinalMarginState::BottomMarginCollapses
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}
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}
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MarginCollapseState::AccumulatingMarginIn => FinalMarginState::BottomMarginCollapses,
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};
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// Different logic is needed here depending on whether this flow can collapse its block-end
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// margin with its children.
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let block_end_margin = fragment.margin.block_end;
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if !can_collapse_block_end_margin_with_kids {
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match state {
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FinalMarginState::MarginsCollapseThrough => {
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let advance = self.block_start_margin.collapse();
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self.margin_in.union(AdjoiningMargins::from_margin(block_end_margin));
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(CollapsibleMargins::Collapse(self.block_start_margin, self.margin_in),
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advance)
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}
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FinalMarginState::BottomMarginCollapses => {
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let advance = self.margin_in.collapse();
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self.margin_in.union(AdjoiningMargins::from_margin(block_end_margin));
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(CollapsibleMargins::Collapse(self.block_start_margin, self.margin_in),
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advance)
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}
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}
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} else {
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match state {
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FinalMarginState::MarginsCollapseThrough => {
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self.block_start_margin.union(AdjoiningMargins::from_margin(block_end_margin));
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(CollapsibleMargins::CollapseThrough(self.block_start_margin), Au(0))
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}
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FinalMarginState::BottomMarginCollapses => {
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self.margin_in.union(AdjoiningMargins::from_margin(block_end_margin));
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(CollapsibleMargins::Collapse(self.block_start_margin, self.margin_in), Au(0))
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}
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}
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}
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}
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pub fn current_float_ceiling(&mut self) -> Au {
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match self.state {
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MarginCollapseState::AccumulatingCollapsibleTopMargin => {
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// We do not include the top margin in the float ceiling, because the float flow
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// needs to be positioned relative to our *border box*, not our margin box. See
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// `tests/ref/float_under_top_margin_a.html`.
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Au(0)
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}
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MarginCollapseState::AccumulatingMarginIn => self.margin_in.collapse(),
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}
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}
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/// Adds the child's potentially collapsible block-start margin to the current margin state and
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/// advances the Y offset by the appropriate amount to handle that margin. Returns the amount
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/// that should be added to the Y offset during block layout.
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pub fn advance_block_start_margin(&mut self,
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child_collapsible_margins: &CollapsibleMargins,
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can_collapse_block_start_margin: bool)
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-> Au {
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if !can_collapse_block_start_margin {
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self.state = MarginCollapseState::AccumulatingMarginIn
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}
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match (self.state, *child_collapsible_margins) {
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(MarginCollapseState::AccumulatingCollapsibleTopMargin,
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CollapsibleMargins::None(block_start, _)) => {
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self.state = MarginCollapseState::AccumulatingMarginIn;
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block_start
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}
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(MarginCollapseState::AccumulatingCollapsibleTopMargin,
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CollapsibleMargins::Collapse(block_start, _)) => {
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self.block_start_margin.union(block_start);
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self.state = MarginCollapseState::AccumulatingMarginIn;
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Au(0)
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}
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(MarginCollapseState::AccumulatingMarginIn,
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CollapsibleMargins::None(block_start, _)) => {
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let previous_margin_value = self.margin_in.collapse();
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self.margin_in = AdjoiningMargins::new();
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previous_margin_value + block_start
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}
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(MarginCollapseState::AccumulatingMarginIn,
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CollapsibleMargins::Collapse(block_start, _)) => {
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self.margin_in.union(block_start);
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let margin_value = self.margin_in.collapse();
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self.margin_in = AdjoiningMargins::new();
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margin_value
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}
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(_, CollapsibleMargins::CollapseThrough(_)) => {
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// For now, we ignore this; this will be handled by `advance_block_end_margin`
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// below.
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Au(0)
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}
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}
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}
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/// Adds the child's potentially collapsible block-end margin to the current margin state and
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/// advances the Y offset by the appropriate amount to handle that margin. Returns the amount
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/// that should be added to the Y offset during block layout.
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pub fn advance_block_end_margin(&mut self, child_collapsible_margins: &CollapsibleMargins)
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-> Au {
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match (self.state, *child_collapsible_margins) {
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(MarginCollapseState::AccumulatingCollapsibleTopMargin, CollapsibleMargins::None(..)) |
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(MarginCollapseState::AccumulatingCollapsibleTopMargin,
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CollapsibleMargins::Collapse(..)) => {
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// Can't happen because the state will have been replaced with
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// `MarginCollapseState::AccumulatingMarginIn` above.
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panic!("should not be accumulating collapsible block_start margins anymore!")
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}
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(MarginCollapseState::AccumulatingCollapsibleTopMargin,
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CollapsibleMargins::CollapseThrough(margin)) => {
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self.block_start_margin.union(margin);
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Au(0)
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}
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(MarginCollapseState::AccumulatingMarginIn,
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CollapsibleMargins::None(_, block_end)) => {
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assert_eq!(self.margin_in.most_positive, Au(0));
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assert_eq!(self.margin_in.most_negative, Au(0));
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block_end
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}
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(MarginCollapseState::AccumulatingMarginIn,
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CollapsibleMargins::Collapse(_, block_end)) |
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(MarginCollapseState::AccumulatingMarginIn,
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CollapsibleMargins::CollapseThrough(block_end)) => {
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self.margin_in.union(block_end);
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Au(0)
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}
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}
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}
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}
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#[derive(Copy, Clone, Debug)]
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pub enum MarginCollapseState {
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/// We are accumulating margin on the logical top of this flow.
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AccumulatingCollapsibleTopMargin,
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/// We are accumulating margin between two blocks.
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AccumulatingMarginIn,
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}
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/// Intrinsic inline-sizes, which consist of minimum and preferred.
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#[derive(Serialize, Copy, Clone)]
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pub struct IntrinsicISizes {
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/// The *minimum inline-size* of the content.
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pub minimum_inline_size: Au,
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/// The *preferred inline-size* of the content.
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pub preferred_inline_size: Au,
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}
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impl fmt::Debug for IntrinsicISizes {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "min={:?}, pref={:?}", self.minimum_inline_size, self.preferred_inline_size)
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}
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}
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impl IntrinsicISizes {
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pub fn new() -> IntrinsicISizes {
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IntrinsicISizes {
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minimum_inline_size: Au(0),
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preferred_inline_size: Au(0),
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}
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}
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}
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/// The temporary result of the computation of intrinsic inline-sizes.
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#[derive(Debug)]
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pub struct IntrinsicISizesContribution {
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/// Intrinsic sizes for the content only (not counting borders, padding, or margins).
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pub content_intrinsic_sizes: IntrinsicISizes,
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/// The inline size of borders and padding, as well as margins if appropriate.
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pub surrounding_size: Au,
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}
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impl IntrinsicISizesContribution {
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/// Creates and initializes an inline size computation with all sizes set to zero.
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pub fn new() -> IntrinsicISizesContribution {
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IntrinsicISizesContribution {
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content_intrinsic_sizes: IntrinsicISizes::new(),
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surrounding_size: Au(0),
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}
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}
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/// Adds the content intrinsic sizes and the surrounding size together to yield the final
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/// intrinsic size computation.
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pub fn finish(self) -> IntrinsicISizes {
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IntrinsicISizes {
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minimum_inline_size: self.content_intrinsic_sizes.minimum_inline_size +
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self.surrounding_size,
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preferred_inline_size: self.content_intrinsic_sizes.preferred_inline_size +
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self.surrounding_size,
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}
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}
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/// Updates the computation so that the minimum is the maximum of the current minimum and the
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/// given minimum and the preferred is the sum of the current preferred and the given
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/// preferred. This is used when laying out fragments in the inline direction.
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///
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/// FIXME(pcwalton): This is incorrect when the inline fragment contains forced line breaks
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/// (e.g. `<br>` or `white-space: pre`).
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pub fn union_inline(&mut self, sizes: &IntrinsicISizes) {
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self.content_intrinsic_sizes.minimum_inline_size =
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max(self.content_intrinsic_sizes.minimum_inline_size, sizes.minimum_inline_size);
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self.content_intrinsic_sizes.preferred_inline_size =
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self.content_intrinsic_sizes.preferred_inline_size + sizes.preferred_inline_size
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}
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/// Updates the computation so that the minimum is the sum of the current minimum and the
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/// given minimum and the preferred is the sum of the current preferred and the given
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/// preferred. This is used when laying out fragments in the inline direction when
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/// `white-space` is `pre` or `nowrap`.
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pub fn union_nonbreaking_inline(&mut self, sizes: &IntrinsicISizes) {
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self.content_intrinsic_sizes.minimum_inline_size =
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self.content_intrinsic_sizes.minimum_inline_size + sizes.minimum_inline_size;
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self.content_intrinsic_sizes.preferred_inline_size =
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self.content_intrinsic_sizes.preferred_inline_size + sizes.preferred_inline_size
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}
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/// Updates the computation so that the minimum is the maximum of the current minimum and the
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/// given minimum and the preferred is the maximum of the current preferred and the given
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/// preferred. This can be useful when laying out fragments in the block direction (but note
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/// that it does not take floats into account, so `BlockFlow` does not use it).
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///
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/// This is used when contributing the intrinsic sizes for individual fragments.
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pub fn union_block(&mut self, sizes: &IntrinsicISizes) {
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self.content_intrinsic_sizes.minimum_inline_size =
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max(self.content_intrinsic_sizes.minimum_inline_size, sizes.minimum_inline_size);
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self.content_intrinsic_sizes.preferred_inline_size =
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max(self.content_intrinsic_sizes.preferred_inline_size, sizes.preferred_inline_size)
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}
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}
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/// Useful helper data type when computing values for blocks and positioned elements.
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#[derive(Copy, Clone, PartialEq, Debug)]
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pub enum MaybeAuto {
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Auto,
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Specified(Au),
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}
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impl MaybeAuto {
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#[inline]
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pub fn from_style(length: LengthOrPercentageOrAuto, containing_length: Au)
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-> MaybeAuto {
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match length {
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LengthOrPercentageOrAuto::Auto => MaybeAuto::Auto,
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LengthOrPercentageOrAuto::Percentage(percent) => {
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MaybeAuto::Specified(containing_length.scale_by(percent))
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}
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LengthOrPercentageOrAuto::Calc(calc) => {
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MaybeAuto::from_option(calc.to_computed(Some(containing_length)))
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}
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LengthOrPercentageOrAuto::Length(length) => MaybeAuto::Specified(length)
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}
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}
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#[inline]
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pub fn from_option(au: Option<Au>) -> MaybeAuto {
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match au {
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Some(l) => MaybeAuto::Specified(l),
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_ => MaybeAuto::Auto,
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}
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}
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#[inline]
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pub fn specified_or_default(&self, default: Au) -> Au {
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match *self {
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MaybeAuto::Auto => default,
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MaybeAuto::Specified(value) => value,
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}
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}
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#[inline]
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pub fn specified_or_zero(&self) -> Au {
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self.specified_or_default(Au::new(0))
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}
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#[inline]
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pub fn map<F>(&self, mapper: F) -> MaybeAuto where F: FnOnce(Au) -> Au {
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match *self {
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MaybeAuto::Auto => MaybeAuto::Auto,
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MaybeAuto::Specified(value) => MaybeAuto::Specified(mapper(value)),
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}
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}
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}
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/// Receive an optional container size and return used value for width or height.
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///
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/// `style_length`: content size as given in the CSS.
|
||
pub fn style_length(style_length: LengthOrPercentageOrAuto,
|
||
container_size: Option<Au>) -> MaybeAuto {
|
||
match container_size {
|
||
Some(length) => MaybeAuto::from_style(style_length, length),
|
||
None => if let LengthOrPercentageOrAuto::Length(length) = style_length {
|
||
MaybeAuto::Specified(length)
|
||
} else {
|
||
MaybeAuto::Auto
|
||
}
|
||
}
|
||
}
|
||
|
||
pub fn specified_or_none(length: LengthOrPercentageOrNone, containing_length: Au) -> Option<Au> {
|
||
match length {
|
||
LengthOrPercentageOrNone::None => None,
|
||
LengthOrPercentageOrNone::Percentage(percent) => Some(containing_length.scale_by(percent)),
|
||
LengthOrPercentageOrNone::Calc(calc) => calc.to_computed(Some(containing_length)),
|
||
LengthOrPercentageOrNone::Length(length) => Some(length),
|
||
}
|
||
}
|
||
|
||
pub fn specified(length: LengthOrPercentage, containing_length: Au) -> Au {
|
||
match length {
|
||
LengthOrPercentage::Length(length) => length,
|
||
LengthOrPercentage::Percentage(p) => containing_length.scale_by(p),
|
||
LengthOrPercentage::Calc(calc) =>
|
||
containing_length.scale_by(calc.percentage()) + calc.length(),
|
||
}
|
||
}
|
||
|
||
pub fn specified_border_radius(radius: BorderRadiusSize, containing_length: Au) -> Size2D<Au> {
|
||
let BorderRadiusSize(size) = radius;
|
||
let w = specified(size.width, containing_length);
|
||
let h = specified(size.height, containing_length);
|
||
Size2D::new(w, h)
|
||
}
|
||
|
||
#[inline]
|
||
pub fn padding_from_style(style: &ServoComputedValues,
|
||
containing_block_inline_size: Au,
|
||
writing_mode: WritingMode)
|
||
-> LogicalMargin<Au> {
|
||
let padding_style = style.get_padding();
|
||
LogicalMargin::from_physical(writing_mode, SideOffsets2D::new(
|
||
specified(padding_style.padding_top, containing_block_inline_size),
|
||
specified(padding_style.padding_right, containing_block_inline_size),
|
||
specified(padding_style.padding_bottom, containing_block_inline_size),
|
||
specified(padding_style.padding_left, containing_block_inline_size)))
|
||
}
|
||
|
||
/// Returns the explicitly-specified margin lengths from the given style. Percentage and auto
|
||
/// margins are returned as zero.
|
||
///
|
||
/// This is used when calculating intrinsic inline sizes.
|
||
#[inline]
|
||
pub fn specified_margin_from_style(style: &ServoComputedValues,
|
||
writing_mode: WritingMode) -> LogicalMargin<Au> {
|
||
let margin_style = style.get_margin();
|
||
LogicalMargin::from_physical(writing_mode, SideOffsets2D::new(
|
||
MaybeAuto::from_style(margin_style.margin_top, Au(0)).specified_or_zero(),
|
||
MaybeAuto::from_style(margin_style.margin_right, Au(0)).specified_or_zero(),
|
||
MaybeAuto::from_style(margin_style.margin_bottom, Au(0)).specified_or_zero(),
|
||
MaybeAuto::from_style(margin_style.margin_left, Au(0)).specified_or_zero()))
|
||
}
|
||
|
||
pub trait ToGfxMatrix {
|
||
fn to_gfx_matrix(&self) -> Matrix4D<f32>;
|
||
}
|
||
|
||
impl ToGfxMatrix for ComputedMatrix {
|
||
fn to_gfx_matrix(&self) -> Matrix4D<f32> {
|
||
Matrix4D::row_major(
|
||
self.m11 as f32, self.m12 as f32, self.m13 as f32, self.m14 as f32,
|
||
self.m21 as f32, self.m22 as f32, self.m23 as f32, self.m24 as f32,
|
||
self.m31 as f32, self.m32 as f32, self.m33 as f32, self.m34 as f32,
|
||
self.m41 as f32, self.m42 as f32, self.m43 as f32, self.m44 as f32)
|
||
}
|
||
}
|
||
|
||
/// A min-size and max-size constraint. The constructor has a optional `border`
|
||
/// parameter, and when it is present the constraint will be subtracted. This is
|
||
/// used to adjust the constraint for `box-sizing: border-box`, and when you do so
|
||
/// make sure the size you want to clamp is intended to be used for content box.
|
||
#[derive(Clone, Copy, Debug, Serialize)]
|
||
pub struct SizeConstraint {
|
||
min_size: Au,
|
||
max_size: Option<Au>,
|
||
}
|
||
|
||
impl SizeConstraint {
|
||
/// Create a `SizeConstraint` for an axis.
|
||
pub fn new(container_size: Option<Au>,
|
||
min_size: LengthOrPercentage,
|
||
max_size: LengthOrPercentageOrNone,
|
||
border: Option<Au>) -> SizeConstraint {
|
||
let mut min_size = match container_size {
|
||
Some(container_size) => specified(min_size, container_size),
|
||
None => if let LengthOrPercentage::Length(length) = min_size {
|
||
length
|
||
} else {
|
||
Au(0)
|
||
}
|
||
};
|
||
|
||
let mut max_size = match container_size {
|
||
Some(container_size) => specified_or_none(max_size, container_size),
|
||
None => if let LengthOrPercentageOrNone::Length(length) = max_size {
|
||
Some(length)
|
||
} else {
|
||
None
|
||
}
|
||
};
|
||
// Make sure max size is not smaller than min size.
|
||
max_size = max_size.map(|x| max(x, min_size));
|
||
|
||
if let Some(border) = border {
|
||
min_size = max((min_size - border), Au(0));
|
||
max_size = max_size.map(|x| max(x - border, Au(0)));
|
||
}
|
||
|
||
SizeConstraint {
|
||
min_size: min_size,
|
||
max_size: max_size
|
||
}
|
||
}
|
||
|
||
/// Clamp the given size by the given min size and max size constraint.
|
||
pub fn clamp(&self, other: Au) -> Au {
|
||
if other < self.min_size {
|
||
self.min_size
|
||
} else {
|
||
match self.max_size {
|
||
Some(max_size) if max_size < other => max_size,
|
||
_ => other
|
||
}
|
||
}
|
||
}
|
||
}
|