RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 16:57:35 +00:00
Code Issues Activity Actions

LibWeb: Implement some AnimationEffect timing-related helpers

Browse source 
end_time, local_time, and active_duration
This commit is contained in:
Matthew Olsson 2023-11-04 11:29:10 -07:00 • committed by Andreas Kling
parent d6fb1c24f6
commit baf5220212
2 changed files with 42 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

38
Userland/Libraries/LibWeb/Animations/AnimationEffect.cpp
View file

@ -162,6 +162,44 @@ AnimationDirection AnimationEffect::animation_direction() const
return AnimationDirection::Forwards;
}
// https://www.w3.org/TR/web-animations-1/#end-time
double AnimationEffect::end_time() const
{
// 1. The end time of an animation effect is the result of evaluating
// max(start delay + active duration + end delay, 0).
return max(m_start_delay + active_duration() + m_end_delay, 0.0);
}
// https://www.w3.org/TR/web-animations-1/#local-time
Optional<double> AnimationEffect::local_time() const
{
// The local time of an animation effect at a given moment is based on the first matching condition from the
// following:
// -> If the animation effect is associated with an animation,
if (m_associated_animation) {
// the local time is the current time of the animation.
return m_associated_animation->current_time();
}
// -> Otherwise,
// the local time is unresolved.
return {};
}
// https://www.w3.org/TR/web-animations-1/#active-duration
double AnimationEffect::active_duration() const
{
// The active duration is calculated as follows:
// active duration = iteration duration × iteration count
// If either the iteration duration or iteration count are zero, the active duration is zero. This clarification is
// needed since the result of infinity multiplied by zero is undefined according to IEEE 754-2008.
if (m_iteration_duration.has<String>() || m_iteration_duration.get<double>() == 0.0 || m_iteration_count == 0.0)
return 0.0;
return m_iteration_duration.get<double>() * m_iteration_count;
}
AnimationEffect::AnimationEffect(JS::Realm& realm)
: Bindings::PlatformObject(realm)
{