RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 21:08:12 +00:00
Code Issues Activity Actions

LibWeb: Implement Animation::set_playback_rate

Browse source
This commit is contained in:
Matthew Olsson 2023-11-04 12:13:25 -07:00 • committed by Andreas Kling
parent 749462f3df
commit 8039fe78cd
2 changed files with 40 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

40
Userland/Libraries/LibWeb/Animations/Animation.cpp
View file

@ -221,8 +221,36 @@ WebIDL::ExceptionOr<void> Animation::set_current_time(Optional<double> const& se
// https://www.w3.org/TR/web-animations-1/#set-the-playback-rate
WebIDL::ExceptionOr<void> Animation::set_playback_rate(double new_playback_rate)
{
// FIXME: Implement
(void)new_playback_rate;
// Setting this attribute follows the procedure to set the playback rate of this object to the new value.
// 1. Clear any pending playback rate on animation.
m_pending_playback_rate = {};
// 2. Let previous time be the value of the current time of animation before changing the playback rate.
auto previous_time = current_time();
// 3. Let previous playback rate be the current effective playback rate of animation.
auto previous_playback_rate = playback_rate();
// 4. Set the playback rate to new playback rate.
m_playback_rate = new_playback_rate;
// 5. Perform the steps corresponding to the first matching condition from the following, if any:
// -> If animation is associated with a monotonically increasing timeline and the previous time is resolved,
if (m_timeline && m_timeline->is_monotonically_increasing() && previous_time.has_value()) {
// set the current time of animation to previous time.
TRY(set_current_time(previous_time));
}
// -> If animation is associated with a non-null timeline that is not monotonically increasing, the start time of
// animation is resolved, associated effect end is not infinity, and either:
// - the previous playback rate < 0 and the new playback rate ≥ 0, or
// - the previous playback rate ≥ 0 and the new playback rate < 0,
else if (m_timeline && !m_timeline->is_monotonically_increasing() && m_start_time.has_value() && !isinf(associated_effect_end()) && ((previous_playback_rate < 0.0 && new_playback_rate >= 0.0) || (previous_playback_rate >= 0 && new_playback_rate < 0))) {
// Set animation’s start time to the result of evaluating associated effect end - start time for animation.
m_start_time = associated_effect_end() - m_start_time.value();
}
return {};
}
@ -233,6 +261,14 @@ Bindings::AnimationPlayState Animation::play_state() const
return Bindings::AnimationPlayState::Idle;
}
// https://www.w3.org/TR/web-animations-1/#associated-effect-end
double Animation::associated_effect_end() const
{
// The associated effect end of an animation is equal to the end time of the animation’s associated effect. If the
// animation has no associated effect, the associated effect end is zero.
return m_effect ? m_effect->end_time() : 0.0;
}
// https://www.w3.org/TR/web-animations-1/#apply-any-pending-playback-rate
void Animation::apply_any_pending_playback_rate()
{