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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 base::print_tree::PrintTree;
use serde::Serialize;
use servo_arc::Arc as ServoArc;
use style::logical_geometry::WritingMode;
use style::properties::ComputedValues;
use style::values::computed::Length;
use super::{BaseFragment, BaseFragmentInfo, Fragment};
use crate::cell::ArcRefCell;
use crate::geom::{LogicalRect, PhysicalRect};
/// Can contain child fragments with relative coordinates, but does not contribute to painting
/// itself. [`PositioningFragment`]s may be completely anonymous, or just non-painting Fragments
/// generated by boxes.
#[derive(Serialize)]
pub(crate) struct PositioningFragment {
pub base: BaseFragment,
pub rect: LogicalRect<Length>,
pub children: Vec<ArcRefCell<Fragment>>,
pub writing_mode: WritingMode,
/// The scrollable overflow of this anonymous fragment's children.
pub scrollable_overflow: PhysicalRect<Length>,
/// If this fragment was created with a style, the style of the fragment.
#[serde(skip_serializing)]
pub style: Option<ServoArc<ComputedValues>>,
}
impl PositioningFragment {
pub fn new_anonymous(
rect: LogicalRect<Length>,
children: Vec<Fragment>,
mode: WritingMode,
) -> Self {
Self::new_with_base_fragment(BaseFragment::anonymous(), None, rect, children, mode)
}
pub fn new_empty(
base_fragment_info: BaseFragmentInfo,
rect: LogicalRect<Length>,
style: ServoArc<ComputedValues>,
) -> Self {
let writing_mode = style.writing_mode;
Self::new_with_base_fragment(
base_fragment_info.into(),
Some(style),
rect,
Vec::new(),
writing_mode,
)
}
fn new_with_base_fragment(
base: BaseFragment,
style: Option<ServoArc<ComputedValues>>,
rect: LogicalRect<Length>,
children: Vec<Fragment>,
mode: WritingMode,
) -> Self {
// FIXME(mrobinson, bug 25564): We should be using the containing block
// here to properly convert scrollable overflow to physical geometry.
let containing_block = PhysicalRect::zero();
let content_origin = rect.start_corner.to_physical(mode);
let scrollable_overflow = children.iter().fold(PhysicalRect::zero(), |acc, child| {
acc.union(
&child
.scrollable_overflow(&containing_block)
.translate(content_origin.to_vector()),
)
});
PositioningFragment {
base,
style,
rect,
children: children.into_iter().map(ArcRefCell::new).collect(),
writing_mode: mode,
scrollable_overflow,
}
}
pub fn print(&self, tree: &mut PrintTree) {
tree.new_level(format!(
"PositioningFragment\
\nbase={:?}\
\nrect={:?}\
\nscrollable_overflow={:?}",
self.base, self.rect, self.scrollable_overflow
));
for child in &self.children {
child.borrow().print(tree);
}
tree.end_level();
}
}
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