зеркало из https://github.com/mozilla/gecko-dev.git
87 строки
3.5 KiB
Rust
87 строки
3.5 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::{FlowFlags, Flow, GetBaseFlow};
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use style::computed_values::float::T as Float;
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use style::selector_parser::RestyleDamage;
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use style::servo::restyle_damage::ServoRestyleDamage;
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/// Used in a flow traversal to indicate whether this re-layout should be incremental or not.
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#[derive(Clone, Copy, PartialEq)]
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pub enum RelayoutMode {
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Incremental,
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Force
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}
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bitflags! {
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pub struct 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 = self.base().flags.contains(FlowFlags::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 = self.mut_base();
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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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kid.base().flags.contains(FlowFlags::IS_ABSOLUTELY_POSITIONED);
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kid.mut_base().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(kid.base().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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kid.base().flags.intersects(FlowFlags::AFFECTS_COUNTERS |
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FlowFlags::HAS_COUNTER_AFFECTING_CHILDREN);
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}
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}
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let self_base = self.mut_base();
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if self_base.flags.float_kind() != Float::None &&
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self_base.restyle_damage.intersects(ServoRestyleDamage::REFLOW) {
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special_damage.insert(SpecialRestyleDamage::REFLOW_ENTIRE_DOCUMENT);
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}
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if has_counter_affecting_children {
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self_base.flags.insert(FlowFlags::HAS_COUNTER_AFFECTING_CHILDREN)
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} else {
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self_base.flags.remove(FlowFlags::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 = self.mut_base();
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self_base.restyle_damage.insert(RestyleDamage::rebuild_and_reflow());
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self_base.restyle_damage.remove(ServoRestyleDamage::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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