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style: Implement overflow:clip/visible combinations.

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Differential Revision: https://phabricator.services.mozilla.com/D73717
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Mats Palmgren 2020-08-01 01:57:41 +00:00 • committed by Emilio Cobos Álvarez
parent 9bfcb3d741
commit b29824bf75
1 changed files with 11 additions and 37 deletions
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48
components/style/style_adjuster.rs
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@ -469,48 +469,22 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
}
}
/// CSS3 overflow-x and overflow-y require some fixup as well in some
/// cases.
///
/// overflow: clip and overflow: visible are meaningful only when used in
/// both dimensions.
/// CSS overflow-x and overflow-y require some fixup as well in some cases.
/// https://drafts.csswg.org/css-overflow-3/#overflow-properties
/// "Computed value: as specified, except with `visible`/`clip` computing to
/// `auto`/`hidden` (respectively) if one of `overflow-x` or `overflow-y` is
/// neither `visible` nor `clip`."
fn adjust_for_overflow(&mut self) {
let original_overflow_x = self.style.get_box().clone_overflow_x();
let original_overflow_y = self.style.get_box().clone_overflow_y();
let mut overflow_x = original_overflow_x;
let mut overflow_y = original_overflow_y;
let overflow_x = self.style.get_box().clone_overflow_x();
let overflow_y = self.style.get_box().clone_overflow_y();
if overflow_x == overflow_y {
return;
return; // optimization for the common case
}
// If 'visible' is specified but doesn't match the other dimension,
// it turns into 'auto'.
if overflow_x == Overflow::Visible {
overflow_x = Overflow::Auto;
}
if overflow_y == Overflow::Visible {
overflow_y = Overflow::Auto;
}
#[cfg(feature = "gecko")]
{
// overflow: clip is deprecated, so convert to hidden if it's
// specified in only one dimension.
if overflow_x == Overflow::Clip {
overflow_x = Overflow::Hidden;
}
if overflow_y == Overflow::Clip {
overflow_y = Overflow::Hidden;
}
}
if overflow_x != original_overflow_x || overflow_y != original_overflow_y {
if overflow_x.is_scrollable() != overflow_y.is_scrollable() {
let box_style = self.style.mutate_box();
box_style.set_overflow_x(overflow_x);
box_style.set_overflow_y(overflow_y);
box_style.set_overflow_x(overflow_x.to_scrollable());
box_style.set_overflow_y(overflow_y.to_scrollable());
}
}