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Simplify layout of absolutes with static insets

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Absolutes with static insets need to be laid out at their ancestor
containing blocks, but their position is dependent on their parent's
layout. The static layout position is passed up the tree during hoisting
and ancestors each add their own offset to the position until it is
relative to the containing block that contains the absolute.

This is currently done with a closure and a fairly tricky "tree rank"
numbering system that needs to be threaded through the entire layout.
This change replaces that system.

Every time a child is laid out we create a positioning context to hold
any absolute children (this can be optimized away at a later time). At
each of these moments, we call a method to aggregate offsets to the
static insets of hoisted absolutes. This makes the logic easier to
follow and will also allow implementing this behavior for inline-blocks,
which was impossible with the old system.
This commit is contained in:
Martin Robinson 2023-06-19 18:04:05 +02:00
parent 836ae5fa48
commit 459a7d26aa
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7 changed files with 174 additions and 235 deletions
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19
components/layout_2020/formatting_contexts.rs
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@ -192,21 +192,14 @@ impl NonReplacedFormattingContext {
layout_context: &LayoutContext,
positioning_context: &mut PositioningContext,
containing_block: &ContainingBlock,
tree_rank: usize,
) -> IndependentLayout {
match &self.contents {
NonReplacedFormattingContextContents::Flow(bfc) => bfc.layout(
layout_context,
positioning_context,
containing_block,
tree_rank,
),
NonReplacedFormattingContextContents::Flex(fc) => fc.layout(
layout_context,
positioning_context,
containing_block,
tree_rank,
),
NonReplacedFormattingContextContents::Flow(bfc) => {
bfc.layout(layout_context, positioning_context, containing_block)
},
NonReplacedFormattingContextContents::Flex(fc) => {
fc.layout(layout_context, positioning_context, containing_block)
},
}
}