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LibWeb: Implement the transition-behavior CSS property

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This specifies whether transitions should be started for transitions
whose animation behavior is discrete.
This commit is contained in:
Tim Ledbetter 2025-04-17 19:11:14 +01:00 • committed by Sam Atkins
commit 542c3cbe51
Notes: github-actions[bot] 2025-05-02 10:08:20 +00:00
20 changed files with 289 additions and 47 deletions
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4
Libraries/LibWeb/CSS/Interpolation.cpp
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@ -177,13 +177,13 @@ ValueComparingRefPtr<CSSStyleValue const> interpolate_property(DOM::Element& ele
}
// https://drafts.csswg.org/css-transitions/#transitionable
bool property_values_are_transitionable(PropertyID property_id, CSSStyleValue const& old_value, CSSStyleValue const& new_value)
bool property_values_are_transitionable(PropertyID property_id, CSSStyleValue const& old_value, CSSStyleValue const& new_value, TransitionBehavior transition_behavior)
{
// When comparing the before-change style and after-change style for a given property,
// the property values are transitionable if they have an animation type that is neither not animatable nor discrete.
auto animation_type = animation_type_from_longhand_property(property_id);
if (animation_type == AnimationType::None || animation_type == AnimationType::Discrete)
if (animation_type == AnimationType::None || (transition_behavior != TransitionBehavior::AllowDiscrete && animation_type == AnimationType::Discrete))
return false;
// FIXME: Even when a property is transitionable, the two values may not be. The spec uses the example of inset/non-inset shadows.