Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-08-06 22:15:33 +01:00
Code Issues Projects Releases Packages Wiki Activity

Better implement getComputedStyle() for positioned insets

Browse source 
The specification dictates quite quite idiosyncratic return values when
querying insets of positioned elements via getComputedStyle(). These
depend on whether or not the elements size was overconstrained. This
change adds a better implementation of that in preparation for returning
proper values for position: sticky.
This commit is contained in:
Martin Robinson 2023-04-28 17:17:43 +02:00
parent 4e37d07ea4
commit e167526618
26 changed files with 801 additions and 1318 deletions
Download patch file Download diff file Expand all files Collapse all files

20
components/layout_2020/query.rs
View file

@ -306,7 +306,18 @@ pub fn process_resolved_style_request<'dom>(
_ => return None,
};
let positioned = style.get_box().position != Position::Static;
if style.get_box().position != Position::Static {
let resolved_insets =
|| box_fragment.calculate_resolved_insets_if_positioned(containing_block);
match longhand_id {
LonghandId::Top => return Some(resolved_insets().top.to_css_string()),
LonghandId::Right => return Some(resolved_insets().right.to_css_string()),
LonghandId::Bottom => return Some(resolved_insets().bottom.to_css_string()),
LonghandId::Left => return Some(resolved_insets().left.to_css_string()),
_ => {},
}
}
let content_rect = box_fragment
.content_rect
.to_physical(box_fragment.style.writing_mode, &containing_block);
@ -327,13 +338,6 @@ pub fn process_resolved_style_request<'dom>(
LonghandId::PaddingTop => Some(padding.top),
LonghandId::PaddingLeft => Some(padding.left),
LonghandId::PaddingRight => Some(padding.right),
// TODO(mrobinson): These following values are often wrong, because these are not
// exactly the "used value" for the positional properties. The real used values are
// lost by the time the Fragment tree is constructed, so we may need to record them in
// the tree to properly answer this query. That said, we can return an okayish value
// sometimes simply by using the calculated position in the containing block.
LonghandId::Top if positioned => Some(content_rect.origin.y),
LonghandId::Left if positioned => Some(content_rect.origin.x),
_ => None,
}
.map(|value| value.to_css_string())