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LibWeb: Cancel animations when element is moved in display none subtree

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We already have logic to play or cancel animations in an element's
subtree when the display property changes to or from none. However,
this was not sufficient to cover the case when an element starts/stops
being nested in display none after insertion.
This commit is contained in:
Aliaksandr Kalenik 2025-03-04 15:32:06 +01:00 • committed by Alexander Kalenik
commit b92a8553c7
Notes: github-actions[bot] 2025-03-04 17:37:15 +00:00
7 changed files with 126 additions and 64 deletions
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68
Libraries/LibWeb/DOM/Element.cpp
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@ -534,9 +534,16 @@ CSS::RequiredInvalidationAfterStyleChange Element::recompute_style()
invalidation = CSS::RequiredInvalidationAfterStyleChange::full();
}
auto old_display_is_none = m_computed_properties ? m_computed_properties->display().is_none() : true;
auto new_display_is_none = new_computed_properties->display().is_none();
if (!invalidation.is_none())
set_computed_properties(move(new_computed_properties));
if (old_display_is_none != new_display_is_none) {
play_or_cancel_animations_after_display_property_change();
}
// Any document change that can cause this element's style to change, could also affect its pseudo-elements.
auto recompute_pseudo_element_style = [&](CSS::Selector::PseudoElement::Type pseudo_element) {
style_computer.push_ancestor(*this);
@ -2648,69 +2655,8 @@ void Element::set_cascaded_properties(Optional<CSS::Selector::PseudoElement::Typ
}
}
bool Element::has_display_none_ancestor()
{
for (auto* ancestor = parent_or_shadow_host(); ancestor; ancestor = ancestor->parent_or_shadow_host()) {
if (!ancestor->is_element())
continue;
auto const& ancestor_element = static_cast<Element&>(*ancestor);
if (ancestor_element.computed_properties() && ancestor_element.computed_properties()->display().is_none()) {
return true;
}
}
return false;
}
void Element::play_or_cancel_animations_after_display_property_change(Optional<CSS::Display> old_display, Optional<CSS::Display> new_display)
{
// https://www.w3.org/TR/css-animations-1/#animations
// Setting the display property to none will terminate any running animation applied to the element and its descendants.
// If an element has a display of none, updating display to a value other than none will start all animations applied to
// the element by the animation-name property, as well as all animations applied to descendants with display other than none.
if (has_display_none_ancestor())
return;
bool previous_display_is_none = old_display.has_value() && old_display->is_none();
bool new_display_is_none = new_display.has_value() && new_display->is_none();
if (previous_display_is_none == new_display_is_none)
return;
auto play_or_cancel_depending_on_display = [&](Animations::Animation& animation) {
if (new_display_is_none) {
animation.cancel();
} else {
HTML::TemporaryExecutionContext context(realm());
animation.play().release_value_but_fixme_should_propagate_errors();
}
};
for_each_shadow_including_inclusive_descendant([&](auto& node) {
if (!node.is_element())
return TraversalDecision::Continue;
auto const& element = static_cast<Element const&>(node);
if (auto animation = element.cached_animation_name_animation({}))
play_or_cancel_depending_on_display(*animation);
for (auto i = 0; i < to_underlying(CSS::Selector::PseudoElement::Type::KnownPseudoElementCount); i++) {
auto pseudo_element = static_cast<CSS::Selector::PseudoElement::Type>(i);
if (auto animation = element.cached_animation_name_animation(pseudo_element))
play_or_cancel_depending_on_display(*animation);
}
return TraversalDecision::Continue;
});
}
void Element::set_computed_properties(GC::Ptr<CSS::ComputedProperties> style)
{
Optional<CSS::Display> old_display;
Optional<CSS::Display> new_display;
if (m_computed_properties)
old_display = m_computed_properties->display();
if (style)
new_display = style->display();
play_or_cancel_animations_after_display_property_change(old_display, new_display);
m_computed_properties = style;
computed_properties_changed();
}