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LibWeb: Implement Animation::current_time

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Matthew Olsson 2023-11-11 08:03:31 -07:00 • committed by Andreas Kling
parent 9802995de8
commit f898b49c8e
1 changed files with 22 additions and 2 deletions
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24
Userland/Libraries/LibWeb/Animations/Animation.cpp
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@ -162,8 +162,28 @@ void Animation::set_start_time(Optional<double> const& new_start_time)
// https://www.w3.org/TR/web-animations-1/#animation-current-time
Optional<double> Animation::current_time() const
{
// FIXME: Implement
return {};
// The current time is calculated from the first matching condition from below:
// -> If the animation’s hold time is resolved,
if (m_hold_time.has_value()) {
// The current time is the animation’s hold time.
return m_hold_time.value();
}
// -> If any of the following are true:
// - the animation has no associated timeline, or
// - the associated timeline is inactive, or
// - the animation’s start time is unresolved.
if (!m_timeline || m_timeline->is_inactive() || !m_start_time.has_value()) {
// The current time is an unresolved time value.
return {};
}
// -> Otherwise,
// current time = (timeline time - start time) × playback rate
// Where timeline time is the current time value of the associated timeline. The playback rate value is defined
// in §4.4.15 Speed control.
return (m_timeline->current_time().value() - m_start_time.value()) * playback_rate();
}
// https://www.w3.org/TR/web-animations-1/#animation-set-the-current-time