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Create HoistedSharedFragment

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This commit is contained in:
Manish Goregaokar 2020-07-24 15:08:25 -07:00
parent 96c0c50874
commit d476a10773
3 changed files with 23 additions and 8 deletions
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26
components/layout_2020/positioned.rs
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@ -46,7 +46,21 @@ pub(crate) struct HoistedAbsolutelyPositionedBox {
/// A reference to a Fragment which is shared between this `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.
pub fragment: ArcRefCell<Option<ArcRefCell<Fragment>>>,
pub fragment: ArcRefCell<HoistedSharedFragment>,
}
/// 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>>,
}
impl HoistedSharedFragment {
pub(crate) fn new() -> Self {
HoistedSharedFragment { fragment: None }
}
}
impl HoistedAbsolutelyPositionedBox {
@ -79,8 +93,8 @@ pub(crate) enum AbsoluteBoxOffsets {
impl AbsoluteBoxOffsets {
fn adjust_offset(&mut self, new_offset: Length) {
match *self {
AbsoluteBoxOffsets::StaticStart {ref mut start} => *start = new_offset,
_ => ()
AbsoluteBoxOffsets::StaticStart { ref mut start } => *start = new_offset,
_ => (),
}
}
}
@ -149,7 +163,7 @@ impl AbsolutelyPositionedBox {
HoistedAbsolutelyPositionedBox {
tree_rank,
box_offsets,
fragment: ArcRefCell::new(None),
fragment: ArcRefCell::new(HoistedSharedFragment::new()),
absolutely_positioned_box: self_,
}
}
@ -376,7 +390,7 @@ impl HoistedAbsolutelyPositionedBox {
containing_block,
)));
*box_.fragment.borrow_mut() = Some(new_fragment.clone());
box_.fragment.borrow_mut().fragment = Some(new_fragment.clone());
new_fragment
},
Vec::new,
@ -389,7 +403,7 @@ impl HoistedAbsolutelyPositionedBox {
for_nearest_containing_block_for_all_descendants,
containing_block,
)));
*box_.fragment.borrow_mut() = Some(new_fragment.clone());
box_.fragment.borrow_mut().fragment = Some(new_fragment.clone());
new_fragment
}))
}