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layout/layout_data.rs -> layout/data.rs
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3f9032c1a1
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7 changed files with 6 additions and 6 deletions
117
components/layout/data.rs
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117
components/layout/data.rs
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/* 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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#![allow(unsafe_blocks)]
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use construct::ConstructionResult;
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use incremental::RestyleDamage;
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use parallel::DomParallelInfo;
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use wrapper::{LayoutNode, TLayoutNode};
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use script::dom::node::SharedLayoutData;
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use script::layout_interface::LayoutChan;
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use std::mem;
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use std::cell::{Ref, RefMut};
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use style::properties::ComputedValues;
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use std::sync::Arc;
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/// Data that layout associates with a node.
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pub struct PrivateLayoutData {
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/// The results of CSS styling for this node's `before` pseudo-element, if any.
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pub before_style: Option<Arc<ComputedValues>>,
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/// The results of CSS styling for this node's `after` pseudo-element, if any.
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pub after_style: Option<Arc<ComputedValues>>,
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/// Description of how to account for recent style changes.
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pub restyle_damage: RestyleDamage,
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/// The current results of flow construction for this node. This is either a flow or a
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/// `ConstructionItem`. See comments in `construct.rs` for more details.
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pub flow_construction_result: ConstructionResult,
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pub before_flow_construction_result: ConstructionResult,
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pub after_flow_construction_result: ConstructionResult,
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/// Information needed during parallel traversals.
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pub parallel: DomParallelInfo,
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/// Various flags.
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pub flags: LayoutDataFlags,
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}
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impl PrivateLayoutData {
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/// Creates new layout data.
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pub fn new() -> PrivateLayoutData {
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PrivateLayoutData {
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before_style: None,
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after_style: None,
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restyle_damage: RestyleDamage::empty(),
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flow_construction_result: ConstructionResult::None,
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before_flow_construction_result: ConstructionResult::None,
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after_flow_construction_result: ConstructionResult::None,
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parallel: DomParallelInfo::new(),
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flags: LayoutDataFlags::empty(),
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}
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}
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}
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bitflags! {
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flags LayoutDataFlags: u8 {
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#[doc="Whether a flow has been newly constructed."]
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const HAS_NEWLY_CONSTRUCTED_FLOW = 0x01
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}
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}
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pub struct LayoutDataWrapper {
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pub chan: Option<LayoutChan>,
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pub shared_data: SharedLayoutData,
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pub data: Box<PrivateLayoutData>,
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}
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impl LayoutDataWrapper {
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pub fn clear(&self) {
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// TODO: Clear items related to this node, e.g. compositor layers
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}
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}
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#[allow(dead_code)]
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fn static_assertion(x: Option<LayoutDataWrapper>) {
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unsafe {
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let _: Option<::script::dom::node::LayoutData> =
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::std::intrinsics::transmute(x);
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}
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}
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/// A trait that allows access to the layout data of a DOM node.
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pub trait LayoutDataAccess {
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/// Borrows the layout data without checks.
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unsafe fn borrow_layout_data_unchecked(&self) -> *const Option<LayoutDataWrapper>;
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/// Borrows the layout data immutably. Fails on a conflicting borrow.
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fn borrow_layout_data<'a>(&'a self) -> Ref<'a,Option<LayoutDataWrapper>>;
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/// Borrows the layout data mutably. Fails on a conflicting borrow.
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fn mutate_layout_data<'a>(&'a self) -> RefMut<'a,Option<LayoutDataWrapper>>;
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}
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impl<'ln> LayoutDataAccess for LayoutNode<'ln> {
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#[inline(always)]
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unsafe fn borrow_layout_data_unchecked(&self) -> *const Option<LayoutDataWrapper> {
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mem::transmute(self.get().layout_data_unchecked())
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}
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#[inline(always)]
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fn borrow_layout_data<'a>(&'a self) -> Ref<'a,Option<LayoutDataWrapper>> {
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unsafe {
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mem::transmute(self.get().layout_data())
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}
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}
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#[inline(always)]
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fn mutate_layout_data<'a>(&'a self) -> RefMut<'a,Option<LayoutDataWrapper>> {
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unsafe {
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mem::transmute(self.get().layout_data_mut())
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}
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}
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}
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