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79 lines
3.3 KiB
Rust
79 lines
3.3 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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use flow::{self, AFFECTS_COUNTERS, Flow, HAS_COUNTER_AFFECTING_CHILDREN, IS_ABSOLUTELY_POSITIONED};
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use script_layout_interface::restyle_damage::{RestyleDamage, REFLOW, RECONSTRUCT_FLOW};
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use style::computed_values::float;
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use style::dom::TRestyleDamage;
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bitflags! {
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pub flags SpecialRestyleDamage: u8 {
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#[doc = "If this flag is set, we need to reflow the entire document. This is more or less a \
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temporary hack to deal with cases that we don't handle incrementally yet."]
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const REFLOW_ENTIRE_DOCUMENT = 0x01,
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}
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}
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pub trait LayoutDamageComputation {
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fn compute_layout_damage(self) -> SpecialRestyleDamage;
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fn reflow_entire_document(self);
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}
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impl<'a> LayoutDamageComputation for &'a mut Flow {
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fn compute_layout_damage(self) -> SpecialRestyleDamage {
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let mut special_damage = SpecialRestyleDamage::empty();
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let is_absolutely_positioned = flow::base(self).flags.contains(IS_ABSOLUTELY_POSITIONED);
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// In addition to damage, we use this phase to compute whether nodes affect CSS counters.
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let mut has_counter_affecting_children = false;
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{
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let self_base = flow::mut_base(self);
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// Take a snapshot of the parent damage before updating it with damage from children.
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let parent_damage = self_base.restyle_damage;
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for kid in self_base.children.iter_mut() {
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let child_is_absolutely_positioned =
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flow::base(kid).flags.contains(IS_ABSOLUTELY_POSITIONED);
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flow::mut_base(kid).restyle_damage.insert(
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parent_damage.damage_for_child(is_absolutely_positioned,
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child_is_absolutely_positioned));
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{
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let kid: &mut Flow = kid;
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special_damage.insert(kid.compute_layout_damage());
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}
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self_base.restyle_damage
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.insert(flow::base(kid).restyle_damage.damage_for_parent(
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child_is_absolutely_positioned));
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has_counter_affecting_children = has_counter_affecting_children ||
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flow::base(kid).flags.intersects(AFFECTS_COUNTERS |
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HAS_COUNTER_AFFECTING_CHILDREN);
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}
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}
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let self_base = flow::mut_base(self);
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if self_base.flags.float_kind() != float::T::none &&
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self_base.restyle_damage.intersects(REFLOW) {
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special_damage.insert(REFLOW_ENTIRE_DOCUMENT);
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}
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if has_counter_affecting_children {
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self_base.flags.insert(HAS_COUNTER_AFFECTING_CHILDREN)
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} else {
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self_base.flags.remove(HAS_COUNTER_AFFECTING_CHILDREN)
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}
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special_damage
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}
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fn reflow_entire_document(self) {
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let self_base = flow::mut_base(self);
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self_base.restyle_damage.insert(RestyleDamage::rebuild_and_reflow());
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self_base.restyle_damage.remove(RECONSTRUCT_FLOW);
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for kid in self_base.children.iter_mut() {
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kid.reflow_entire_document();
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}
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}
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}
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