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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 https://mozilla.org/MPL/2.0/. */
use crate::dom_traversal::{Contents, NodeExt};
use crate::flow::construct::ContainsFloats;
use crate::flow::float::FloatBox;
use crate::flow::{BlockContainer, BlockFormattingContext, BlockLevelBox};
use crate::fragments::Fragment;
use crate::geom;
use crate::geom::flow_relative::Vec2;
use crate::positioned::AbsolutelyPositionedBox;
use crate::replaced::ReplacedContent;
use crate::style_ext::{
Direction, Display, DisplayGeneratingBox, DisplayInside, DisplayOutside, WritingMode,
};
use crate::{ContainingBlock, DefiniteContainingBlock, IndependentFormattingContext};
use rayon::iter::{IntoParallelRefIterator, ParallelExtend, ParallelIterator};
use servo_arc::Arc;
use style::context::SharedStyleContext;
use style::properties::ComputedValues;
use style::values::computed::{Length, LengthOrAuto};
use style_traits::CSSPixel;
pub struct BoxTreeRoot(BlockFormattingContext);
impl BoxTreeRoot {
pub fn construct<'dom>(
context: &SharedStyleContext<'_>,
root_element: impl NodeExt<'dom>,
) -> Self {
let (contains_floats, boxes) = construct_for_root_element(&context, root_element);
Self(BlockFormattingContext {
contains_floats: contains_floats == ContainsFloats::Yes,
contents: BlockContainer::BlockLevelBoxes(boxes),
})
}
}
fn construct_for_root_element<'dom>(
context: &SharedStyleContext<'_>,
root_element: impl NodeExt<'dom>,
) -> (ContainsFloats, Vec<Arc<BlockLevelBox>>) {
let style = root_element.style(context);
let replaced = ReplacedContent::for_element(root_element, context);
let box_style = style.get_box();
let display_inside = match Display::from(box_style.display) {
Display::None => return (ContainsFloats::No, Vec::new()),
Display::Contents if replaced.is_some() => {
// 'display: contents' computes to 'none' for replaced elements
return (ContainsFloats::No, Vec::new());
},
// https://drafts.csswg.org/css-display-3/#transformations
Display::Contents => DisplayInside::Flow,
// The root element is blockified, ignore DisplayOutside
Display::GeneratingBox(DisplayGeneratingBox::OutsideInside { inside, .. }) => inside,
};
if let Some(replaced) = replaced {
let _box = match replaced {};
#[allow(unreachable_code)]
{
return (ContainsFloats::No, vec![Arc::new(_box)]);
}
}
let contents = IndependentFormattingContext::construct(
context,
&style,
display_inside,
Contents::OfElement(root_element),
);
if box_style.position.is_absolutely_positioned() {
(
ContainsFloats::No,
vec![Arc::new(BlockLevelBox::OutOfFlowAbsolutelyPositionedBox(
AbsolutelyPositionedBox { style, contents },
))],
)
} else if box_style.float.is_floating() {
(
ContainsFloats::Yes,
vec![Arc::new(BlockLevelBox::OutOfFlowFloatBox(FloatBox {
contents,
style,
}))],
)
} else {
(
ContainsFloats::No,
vec![Arc::new(BlockLevelBox::Independent { style, contents })],
)
}
}
impl BoxTreeRoot {
fn layout(&self, viewport: geom::Size<CSSPixel>) -> Vec<Fragment> {
let initial_containing_block_size = Vec2 {
inline: Length::new(viewport.width),
block: Length::new(viewport.height),
};
let initial_containing_block = ContainingBlock {
inline_size: initial_containing_block_size.inline,
block_size: LengthOrAuto::LengthPercentage(initial_containing_block_size.block),
// FIXME: use the document’s mode:
// https://drafts.csswg.org/css-writing-modes/#principal-flow
mode: (WritingMode::HorizontalTb, Direction::Ltr),
};
let dummy_tree_rank = 0;
let mut absolutely_positioned_fragments = vec![];
let mut flow_children = self.0.layout(
&initial_containing_block,
dummy_tree_rank,
&mut absolutely_positioned_fragments,
);
let initial_containing_block = DefiniteContainingBlock {
size: initial_containing_block_size,
mode: initial_containing_block.mode,
};
flow_children.fragments.par_extend(
absolutely_positioned_fragments
.par_iter()
.map(|a| a.layout(&initial_containing_block)),
);
flow_children.fragments
}
}
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