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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 app_units::Au;
use serde::Serialize;
use style::values::computed::LengthPercentage;
use super::Fragment;
use crate::cell::ArcRefCell;
use crate::geom::LogicalVec2;
/// A reference to a Fragment which is shared between `HoistedAbsolutelyPositionedBox`
/// and its placeholder `AbsoluteOrFixedPositionedFragment` in the original tree position.
/// This will be used later in order to paint this hoisted box in tree order.
#[derive(Serialize)]
pub(crate) struct HoistedSharedFragment {
pub fragment: Option<ArcRefCell<Fragment>>,
pub box_offsets: LogicalVec2<AbsoluteBoxOffsets>,
}
impl HoistedSharedFragment {
pub(crate) fn new(box_offsets: LogicalVec2<AbsoluteBoxOffsets>) -> Self {
HoistedSharedFragment {
fragment: None,
box_offsets,
}
}
}
impl HoistedSharedFragment {
/// In some cases `inset: auto`-positioned elements do not know their precise
/// position until after they're hoisted. This lets us adjust auto values
/// after the fact.
pub(crate) fn adjust_offsets(&mut self, offsets: LogicalVec2<Au>) {
self.box_offsets.inline.adjust_offset(offsets.inline);
self.box_offsets.block.adjust_offset(offsets.block);
}
}
#[derive(Clone, Debug, Serialize)]
pub(crate) enum AbsoluteBoxOffsets {
StaticStart {
start: Au,
},
Start {
start: LengthPercentage,
},
End {
end: LengthPercentage,
},
Both {
start: LengthPercentage,
end: LengthPercentage,
},
}
impl AbsoluteBoxOffsets {
pub(crate) fn both_specified(&self) -> bool {
matches!(self, AbsoluteBoxOffsets::Both { .. })
}
pub(crate) fn adjust_offset(&mut self, new_offset: Au) {
if let AbsoluteBoxOffsets::StaticStart { ref mut start } = *self {
*start = new_offset
}
}
}
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