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LibWeb: Add preliminary support for CSS animations
This partially implements CSS-Animations-1 (though there are references to CSS-Animations-2). Current limitations: - Multi-selector keyframes are not supported. - Most animation properties are ignored. - Timing functions are not applied. - Non-absolute values are not interpolated unless the target is also of the same non-absolute type (e.g. 10% -> 25%, but not 10% -> 20px). - The JavaScript interface is left as an exercise for the next poor soul looking at this code. With those said, this commit implements: - Interpolation for most common types - Proper keyframe resolution (including the synthetic from-keyframe containing the initial state) - Properly driven animations, and proper style invalidation Co-Authored-By: Andreas Kling <kling@serenityos.org>
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31 changed files with 1062 additions and 12 deletions
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@ -23,6 +23,7 @@ public:
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virtual bool condition_matches() const = 0;
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virtual void for_each_effective_style_rule(Function<void(CSSStyleRule const&)> const& callback) const override;
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virtual void for_each_effective_keyframes_at_rule(Function<void(CSSKeyframesRule const&)> const& callback) const override;
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protected:
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CSSConditionRule(JS::Realm&, CSSRuleList&);
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