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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#![allow(unsafe_blocks)]
use construct::ConstructionResult;
use incremental::RestyleDamage;
use parallel::DomParallelInfo;
use wrapper::{LayoutNode, TLayoutNode};
use script::dom::node::SharedLayoutData;
use script::layout_interface::LayoutChan;
use std::mem;
use std::cell::{Ref, RefMut};
use style::properties::ComputedValues;
use std::sync::Arc;
/// Data that layout associates with a node.
pub struct PrivateLayoutData {
/// The results of CSS styling for this node's `before` pseudo-element, if any.
pub before_style: Option<Arc<ComputedValues>>,
/// The results of CSS styling for this node's `after` pseudo-element, if any.
pub after_style: Option<Arc<ComputedValues>>,
/// Description of how to account for recent style changes.
pub restyle_damage: RestyleDamage,
/// The current results of flow construction for this node. This is either a flow or a
/// `ConstructionItem`. See comments in `construct.rs` for more details.
pub flow_construction_result: ConstructionResult,
pub before_flow_construction_result: ConstructionResult,
pub after_flow_construction_result: ConstructionResult,
/// Information needed during parallel traversals.
pub parallel: DomParallelInfo,
/// Various flags.
pub flags: LayoutDataFlags,
}
impl PrivateLayoutData {
/// Creates new layout data.
pub fn new() -> PrivateLayoutData {
PrivateLayoutData {
before_style: None,
after_style: None,
restyle_damage: RestyleDamage::empty(),
flow_construction_result: ConstructionResult::None,
before_flow_construction_result: ConstructionResult::None,
after_flow_construction_result: ConstructionResult::None,
parallel: DomParallelInfo::new(),
flags: LayoutDataFlags::empty(),
}
}
}
bitflags! {
flags LayoutDataFlags: u8 {
#[doc="Whether a flow has been newly constructed."]
const HAS_NEWLY_CONSTRUCTED_FLOW = 0x01
}
}
pub struct LayoutDataWrapper {
pub chan: Option<LayoutChan>,
pub shared_data: SharedLayoutData,
pub data: Box<PrivateLayoutData>,
}
impl LayoutDataWrapper {
pub fn clear(&self) {
// TODO: Clear items related to this node, e.g. compositor layers
}
}
#[allow(dead_code)]
fn static_assertion(x: Option<LayoutDataWrapper>) {
unsafe {
let _: Option<::script::dom::node::LayoutData> =
::std::intrinsics::transmute(x);
}
}
/// A trait that allows access to the layout data of a DOM node.
pub trait LayoutDataAccess {
/// Borrows the layout data without checks.
unsafe fn borrow_layout_data_unchecked(&self) -> *const Option<LayoutDataWrapper>;
/// Borrows the layout data immutably. Fails on a conflicting borrow.
fn borrow_layout_data<'a>(&'a self) -> Ref<'a,Option<LayoutDataWrapper>>;
/// Borrows the layout data mutably. Fails on a conflicting borrow.
fn mutate_layout_data<'a>(&'a self) -> RefMut<'a,Option<LayoutDataWrapper>>;
}
impl<'ln> LayoutDataAccess for LayoutNode<'ln> {
#[inline(always)]
unsafe fn borrow_layout_data_unchecked(&self) -> *const Option<LayoutDataWrapper> {
mem::transmute(self.get().layout_data_unchecked())
}
#[inline(always)]
fn borrow_layout_data<'a>(&'a self) -> Ref<'a,Option<LayoutDataWrapper>> {
unsafe {
mem::transmute(self.get().layout_data())
}
}
#[inline(always)]
fn mutate_layout_data<'a>(&'a self) -> RefMut<'a,Option<LayoutDataWrapper>> {
unsafe {
mem::transmute(self.get().layout_data_mut())
}
}
}
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