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Properly handle scroll offsets in hit testing

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Scroll roots are no longer nested containers holding items, so instead
we need to track the offsets of each, carefully handling fixed position
items and stacking contexts that create new reference frames.
Additionally, we remove the complexity of the pre-computed page scroll
offset, instead opting to send script scrolls to the layout task in
order to more quickly have a ScrollState there that matches the
script's idea of the scroll world.

Fixes #16405.
This commit is contained in:
Martin Robinson 2017-05-12 10:56:18 +02:00
parent 7ca393a960
commit 9fd2df5c09
8 changed files with 221 additions and 178 deletions
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4
components/layout/query.rs
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@ -81,8 +81,8 @@ pub struct LayoutThreadData {
/// A queued response for the offset parent/rect of a node.
pub margin_style_response: MarginStyleResponse,
/// Scroll offsets of stacking contexts. This will only be populated if WebRender is in use.
pub stacking_context_scroll_offsets: ScrollOffsetMap,
/// Scroll offsets of scrolling regions.
pub scroll_offsets: ScrollOffsetMap,
/// Index in a text fragment. We need this do determine the insertion point.
pub text_index_response: TextIndexResponse,