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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/script_traits/lib.rs
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@ -122,7 +122,7 @@ pub enum LayoutControlMsg {
/// Asks layout to run another step in its animation.
TickAnimations,
/// Tells layout about the new scrolling offsets of each scrollable stacking context.
SetStackingContextScrollStates(Vec<StackingContextScrollState>),
SetScrollStates(Vec<ScrollState>),
/// Requests the current load state of Web fonts. `true` is returned if fonts are still loading
/// and `false` is returned if all fonts have loaded.
GetWebFontLoadState(IpcSender<bool>),
@ -673,7 +673,7 @@ pub enum AnimationTickType {
/// The scroll state of a stacking context.
#[derive(Copy, Clone, Debug, Deserialize, Serialize)]
pub struct StackingContextScrollState {
pub struct ScrollState {
/// The ID of the scroll root.
pub scroll_root_id: ClipId,
/// The scrolling offset of this stacking context.