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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at */
#include "ScrollTimelineAnimationTracker.h"
#include "mozilla/dom/Document.h"
namespace mozilla {
NS_IMPL_CYCLE_COLLECTION(ScrollTimelineAnimationTracker, mPendingSet, mDocument)
void ScrollTimelineAnimationTracker::TriggerPendingAnimations() {
for (auto iter = mPendingSet.begin(), end = mPendingSet.end(); iter != end;
++iter) {
dom::Animation* animation = *iter;
MOZ_ASSERT(animation->GetTimeline() &&
// FIXME: Trigger now may not be correct because the spec says:
// If a user agent determines that animation is immediately ready, it may
// schedule the task (i.e. ResumeAt()) as a microtask such that it runs at
// the next microtask checkpoint, but it must not perform the task
// synchronously.
// Note: So, for now, we put the animation into the tracker, and trigger
// them immediately until the frames are ready. Using TriggerOnNextTick()
// for scroll-driven animations may have issues because we don't tick if
// no one does scroll.
if (!animation->TryTriggerNow()) {
// Note: We keep this animation pending even if its timeline is always
// inactive. It's pretty hard to tell its future status, for example, it's
// possible that the scroll container is in display:none subtree but the
// animating element isn't the subtree, then we need to keep tracking the
// situation until the scroll container gets framed. so in general we make
// this animation be pending (i.e. not ready) if its scroll-timeline is
// inactive, and this also matches the current spec definition.
// Note: Remove() is legitimately called once per entry during the loop.
} // namespace mozilla