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LibWeb: Dispatch Animation events

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Matthew Olsson 2024-02-22 13:57:17 +00:00 committed by Andreas Kling
parent ae3326a447
commit 65858154de
Notes: sideshowbarker 2024-07-17 05:58:46 +09:00 
Author: https://github.com/mattco98
Commit: https://github.com/SerenityOS/serenity/commit/65858154de
Pull-request: https://github.com/SerenityOS/serenity/pull/23311
Issue: https://github.com/SerenityOS/serenity/issues/21570
1 changed files with 84 additions and 1 deletions
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85
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -1901,7 +1901,90 @@ void Document::dispatch_events_for_animation_if_necessary(JS::NonnullGCPtr<Anima
if (!effect || !effect->is_keyframe_effect() || !animation->is_css_animation() || animation->pending())
return;
// TODO: Dispatch events
auto& css_animation = verify_cast<CSS::CSSAnimation>(*animation);
css_animation.owning_element()->set_needs_style_update(true);
auto previous_phase = effect->previous_phase();
auto current_phase = effect->phase();
auto current_iteration = effect->current_iteration().value_or(0.0);
if (previous_phase != current_phase) {
auto owning_element = css_animation.owning_element();
auto dispatch_event = [&](FlyString name, double elapsed_time) {
append_pending_animation_event({
.event = CSS::AnimationEvent::create(
owning_element->realm(),
name,
{
{ .bubbles = true },
css_animation.id(),
elapsed_time,
}),
.target = animation,
.scheduled_event_time = HighResolutionTime::unsafe_shared_current_time(),
});
};
// For calculating the elapsedTime of each event, the following definitions are used:
// - interval start = max(min(-start delay, active duration), 0)
auto interval_start = max(min(-effect->start_delay(), effect->active_duration()), 0.0);
// - interval end = max(min(associated effect end - start delay, active duration), 0)
auto interval_end = max(min(effect->end_time() - effect->start_delay(), effect->active_duration()), 0.0);
switch (previous_phase) {
case Animations::AnimationEffect::Phase::Before:
[[fallthrough]];
case Animations::AnimationEffect::Phase::Idle:
if (current_phase == Animations::AnimationEffect::Phase::Active) {
dispatch_event("animationstart"_fly_string, interval_start);
} else if (current_phase == Animations::AnimationEffect::Phase::After) {
dispatch_event("animationstart"_fly_string, interval_start);
dispatch_event("animationend"_fly_string, interval_end);
}
break;
case Animations::AnimationEffect::Phase::Active:
if (current_phase == Animations::AnimationEffect::Phase::Before) {
dispatch_event("animationend"_fly_string, interval_start);
} else if (current_phase == Animations::AnimationEffect::Phase::Active) {
auto previous_current_iteration = effect->previous_current_iteration();
if (previous_current_iteration != current_iteration) {
// The elapsed time for an animationiteration event is defined as follows:
// 1. Let previous current iteration be the current iteration from the previous animation frame.
// 2. If previous current iteration is greater than current iteration, let iteration boundary be current iteration + 1,
// otherwise let it be current iteration.
auto iteration_boundary = previous_current_iteration > current_iteration ? current_iteration + 1 : current_iteration;
// 3. The elapsed time is the result of evaluating (iteration boundary - iteration start) × iteration duration).
auto iteration_duration_variant = effect->iteration_duration();
auto iteration_duration = iteration_duration_variant.has<String>() ? 0.0 : iteration_duration_variant.get<double>();
auto elapsed_time = (iteration_boundary - effect->iteration_start()) * iteration_duration;
dispatch_event("animationiteration"_fly_string, elapsed_time);
}
} else if (current_phase == Animations::AnimationEffect::Phase::After) {
dispatch_event("animationend"_fly_string, interval_end);
}
break;
case Animations::AnimationEffect::Phase::After:
if (current_phase == Animations::AnimationEffect::Phase::Active) {
dispatch_event("animationstart"_fly_string, interval_end);
} else if (current_phase == Animations::AnimationEffect::Phase::Before) {
dispatch_event("animationstart"_fly_string, interval_end);
dispatch_event("animationend"_fly_string, interval_start);
}
break;
}
if (current_phase == Animations::AnimationEffect::Phase::Idle && previous_phase != Animations::AnimationEffect::Phase::Idle && previous_phase != Animations::AnimationEffect::Phase::After) {
// FIXME: Use the active time "at the moment it was cancelled"
dispatch_event("animationcancel"_fly_string, effect->active_time_using_fill(Bindings::FillMode::Both).value());
}
}
}
// https://html.spec.whatwg.org/multipage/browsing-the-web.html#scroll-to-the-fragment-identifier