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layout: Allow non-absolutely-positioned elements with overflow: scroll

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set to be scrolled.

This makes them establish stacking contexts, which is a CSS 2.1 spec
violation. However, we were already violating the spec here for
absolutely-positioned elements with `overflow: scroll`. It will probably
be easier to fix this spec violation once we either switch entirely to
WebRender or we have multiple layers per stacking context.

Closes #2742.
This commit is contained in:
Patrick Walton 2016-04-06 17:53:11 -07:00
parent 0b951f65b9
commit 1e884ddc69
4 changed files with 54 additions and 27 deletions
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35
components/layout/display_list_builder.rs
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@ -1470,33 +1470,22 @@ impl FragmentDisplayListBuilding for Fragment {
// Clip according to the values of `overflow-x` and `overflow-y`.
//
// TODO(pcwalton): Support scrolling of non-absolutely-positioned elements.
// FIXME(pcwalton): This may be more complex than it needs to be, since it seems to be
// impossible with the computed value rules as they are to have `overflow-x: visible` with
// `overflow-y: <scrolling>` or vice versa!
match (self.style.get_box().overflow_x, is_absolutely_positioned) {
(overflow_x::T::hidden, _) |
(overflow_x::T::auto, false) |
(overflow_x::T::scroll, false) => {
let mut bounds = current_clip.bounding_rect();
let max_x = cmp::min(bounds.max_x(), overflow_clip_rect.max_x());
bounds.origin.x = cmp::max(bounds.origin.x, overflow_clip_rect.origin.x);
bounds.size.width = max_x - bounds.origin.x;
current_clip.intersect_rect(&bounds)
}
_ => {}
if let overflow_x::T::hidden = self.style.get_box().overflow_x {
let mut bounds = current_clip.bounding_rect();
let max_x = cmp::min(bounds.max_x(), overflow_clip_rect.max_x());
bounds.origin.x = cmp::max(bounds.origin.x, overflow_clip_rect.origin.x);
bounds.size.width = max_x - bounds.origin.x;
current_clip.intersect_rect(&bounds)
}
match (self.style.get_box().overflow_y.0, is_absolutely_positioned) {
(overflow_x::T::hidden, _) |
(overflow_x::T::auto, false) |
(overflow_x::T::scroll, false) => {
let mut bounds = current_clip.bounding_rect();
let max_y = cmp::min(bounds.max_y(), overflow_clip_rect.max_y());
bounds.origin.y = cmp::max(bounds.origin.y, overflow_clip_rect.origin.y);
bounds.size.height = max_y - bounds.origin.y;
current_clip.intersect_rect(&bounds)
}
_ => {}
if let overflow_x::T::hidden = self.style.get_box().overflow_y.0 {
let mut bounds = current_clip.bounding_rect();
let max_y = cmp::min(bounds.max_y(), overflow_clip_rect.max_y());
bounds.origin.y = cmp::max(bounds.origin.y, overflow_clip_rect.origin.y);
bounds.size.height = max_y - bounds.origin.y;
current_clip.intersect_rect(&bounds)
}
let border_radii = build_border_radius(stacking_relative_border_box,