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LibWeb: Implement AnimationEffect's transformed_progress helper

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Matthew Olsson 2023-11-04 11:55:16 -07:00 • committed by Andreas Kling
parent 611faf3645
commit 0d3c8a1cd9
2 changed files with 26 additions and 0 deletions
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25
Userland/Libraries/LibWeb/Animations/AnimationEffect.cpp
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@ -462,6 +462,31 @@ Optional<double> AnimationEffect::current_iteration() const
return floor(overall_progress().value());
}
// https://www.w3.org/TR/web-animations-1/#transformed-progress
Optional<double> AnimationEffect::transformed_progress() const
{
// 1. If the directed progress is unresolved, return unresolved.
auto directed_progress = this->directed_progress();
if (!directed_progress.has_value())
return {};
// 2. Calculate the value of the before flag as follows:
// 1. Determine the current direction using the procedure defined in §4.9.1 Calculating the directed progress.
auto current_direction = this->current_direction();
// 2. If the current direction is forwards, let going forwards be true, otherwise it is false.
auto going_forwards = current_direction == AnimationDirection::Forwards;
// 3. The before flag is set if the animation effect is in the before phase and going forwards is true; or if the animation effect
// is in the after phase and going forwards is false.
auto before_flag = (is_in_the_before_phase() && going_forwards) || (is_in_the_after_phase() && !going_forwards);
// 3. Return the result of evaluating the animation effect’s timing function passing directed progress as the input progress value and
// before flag as the before flag.
return m_timing_function(directed_progress.value(), before_flag);
}
AnimationEffect::AnimationEffect(JS::Realm& realm)
: Bindings::PlatformObject(realm)
{