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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::context::LayoutContext;
use crate::dom_traversal::{Contents, NodeExt};
use crate::flow::construct::ContainsFloats;
use crate::flow::float::FloatBox;
use crate::flow::{BlockContainer, BlockFormattingContext, BlockLevelBox};
use crate::formatting_contexts::IndependentFormattingContext;
use crate::fragments::Fragment;
use crate::geom::flow_relative::Vec2;
use crate::geom::PhysicalRect;
use crate::positioned::AbsolutelyPositionedBox;
use crate::positioned::PositioningContext;
use crate::replaced::ReplacedContent;
use crate::sizing::ContentSizesRequest;
use crate::style_ext::{Display, DisplayGeneratingBox, DisplayInside};
use crate::DefiniteContainingBlock;
use app_units::Au;
use euclid::default::{Point2D, Rect, Size2D};
use gfx_traits::print_tree::PrintTree;
use script_layout_interface::wrapper_traits::LayoutNode;
use servo_arc::Arc;
use style::properties::ComputedValues;
use style::values::computed::Length;
use style_traits::CSSPixel;
pub struct BoxTreeRoot(BlockFormattingContext);
pub struct FragmentTreeRoot {
/// The children of the root of the fragment tree.
children: Vec<Fragment>,
/// The scrollable overflow of the root of the fragment tree.
scrollable_overflow: PhysicalRect<Length>,
/// The axis-aligned bounding box of the border box of all child fragments
bounding_box_of_border_boxes: PhysicalRect<Length>,
}
impl BoxTreeRoot {
pub fn construct<'dom, Node>(context: &LayoutContext, root_element: Node) -> Self
where
Node: 'dom + Copy + LayoutNode + Send + Sync,
{
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: &LayoutContext,
root_element: impl NodeExt<'dom>,
) -> (ContainsFloats, Vec<Arc<BlockLevelBox>>) {
let style = root_element.style(context);
let replaced = ReplacedContent::for_element(root_element);
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,
};
let contents = replaced.map_or(Contents::OfElement, Contents::Replaced);
if box_style.position.is_absolutely_positioned() {
(
ContainsFloats::No,
vec![Arc::new(BlockLevelBox::OutOfFlowAbsolutelyPositionedBox(
AbsolutelyPositionedBox::construct(
context,
root_element,
style,
display_inside,
contents,
),
))],
)
} else if box_style.float.is_floating() {
(
ContainsFloats::Yes,
vec![Arc::new(BlockLevelBox::OutOfFlowFloatBox(
FloatBox::construct(context, root_element, style, display_inside, contents),
))],
)
} else {
(
ContainsFloats::No,
vec![Arc::new(BlockLevelBox::Independent(
IndependentFormattingContext::construct(
context,
root_element,
style,
display_inside,
contents,
ContentSizesRequest::None,
),
))],
)
}
}
impl BoxTreeRoot {
pub fn layout(
&self,
layout_context: &LayoutContext,
viewport: euclid::Size2D<f32, CSSPixel>,
) -> FragmentTreeRoot {
let style = ComputedValues::initial_values();
let initial_containing_block = DefiniteContainingBlock {
size: Vec2 {
inline: Length::new(viewport.width),
block: Length::new(viewport.height),
},
// FIXME: use the document’s mode:
// https://drafts.csswg.org/css-writing-modes/#principal-flow
style,
};
let dummy_tree_rank = 0;
let mut positioning_context = PositioningContext::new_for_initial_containing_block();
let mut independent_layout = self.0.layout(
layout_context,
&mut positioning_context,
&(&initial_containing_block).into(),
dummy_tree_rank,
);
positioning_context.layout_in_initial_containing_block(
layout_context,
&initial_containing_block,
&mut independent_layout.fragments,
);
// FIXME(mrobinson, bug 25564): We should be using the containing block
// here to properly convert scrollable overflow to physical geometry.
let scrollable_overflow =
independent_layout
.fragments
.iter()
.fold(PhysicalRect::zero(), |acc, child| {
let child_overflow = child.scrollable_overflow();
// https://drafts.csswg.org/css-overflow/#scrolling-direction
// We want to clip scrollable overflow on box-start and inline-start
// sides of the scroll container.
//
// FIXME(mrobinson, bug 25564): This should take into account writing
// mode.
let child_overflow = PhysicalRect::new(
euclid::Point2D::zero(),
euclid::Size2D::new(
child_overflow.size.width + child_overflow.origin.x,
child_overflow.size.height + child_overflow.origin.y,
),
);
acc.union(&child_overflow)
});
let containing_block = PhysicalRect::zero();
let bounding_box_of_border_boxes =
independent_layout
.fragments
.iter()
.fold(PhysicalRect::zero(), |acc, child| {
acc.union(&match child {
Fragment::Box(fragment) => fragment
.border_rect()
.to_physical(fragment.style.writing_mode, &containing_block),
Fragment::Anonymous(fragment) => {
fragment.rect.to_physical(fragment.mode, &containing_block)
},
Fragment::Text(fragment) => fragment
.rect
.to_physical(fragment.parent_style.writing_mode, &containing_block),
Fragment::Image(fragment) => fragment
.rect
.to_physical(fragment.style.writing_mode, &containing_block),
})
});
FragmentTreeRoot {
children: independent_layout.fragments,
scrollable_overflow,
bounding_box_of_border_boxes,
}
}
}
impl FragmentTreeRoot {
pub fn build_display_list(
&self,
builder: &mut crate::display_list::DisplayListBuilder,
viewport_size: webrender_api::units::LayoutSize,
) {
let containing_block = PhysicalRect::new(
euclid::Point2D::zero(),
euclid::Size2D::new(
Length::new(viewport_size.width),
Length::new(viewport_size.height),
),
);
for fragment in &self.children {
fragment.build_display_list(builder, &containing_block)
}
}
pub fn print(&self) {
let mut print_tree = PrintTree::new("Fragment Tree".to_string());
for fragment in &self.children {
fragment.print(&mut print_tree);
}
}
pub fn scrollable_overflow(&self) -> webrender_api::units::LayoutSize {
webrender_api::units::LayoutSize::from_untyped(Size2D::new(
self.scrollable_overflow.size.width.px(),
self.scrollable_overflow.size.height.px(),
))
}
pub fn bounding_box_of_border_boxes(&self) -> Rect<Au> {
let origin = Point2D::new(
Au::from_f32_px(self.bounding_box_of_border_boxes.origin.x.px()),
Au::from_f32_px(self.bounding_box_of_border_boxes.origin.y.px()),
);
let size = Size2D::new(
Au::from_f32_px(self.bounding_box_of_border_boxes.size.width.px()),
Au::from_f32_px(self.bounding_box_of_border_boxes.size.height.px()),
);
Rect::new(origin, size)
}
}
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