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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 */
#ifndef mozilla_TimelineCollection_h
#define mozilla_TimelineCollection_h
#include "mozilla/Assertions.h"
#include "mozilla/LinkedList.h"
#include "mozilla/Maybe.h"
#include "mozilla/RefPtr.h"
#include "nsAtomHashKeys.h"
#include "nsTHashMap.h"
class nsAtom;
namespace mozilla {
namespace dom {
class Element;
enum class PseudoStyleType : uint8_t;
// The collection of ScrollTimeline or ViewTimeline. We use the template class
// to share the implementation for these two timeline types.
template <class TimelineType>
class TimelineCollection final
: public LinkedListElement<TimelineCollection<TimelineType>> {
using SelfType = TimelineCollection<TimelineType>;
using TimelineMap = nsTHashMap<RefPtr<nsAtom>, RefPtr<TimelineType>>;
TimelineCollection(dom::Element& aElement, PseudoStyleType aPseudoType)
: mElement(aElement), mPseudo(aPseudoType) {
already_AddRefed<TimelineType> Lookup(nsAtom* aName) const {
return mTimelines.Get(aName).forget();
already_AddRefed<TimelineType> Extract(nsAtom* aName) {
Maybe<RefPtr<TimelineType>> timeline = mTimelines.Extract(aName);
return timeline ? timeline->forget() : nullptr;
void Swap(TimelineMap& aValue) { mTimelines.SwapElements(aValue); }
void Destroy();
// Get the collection of timelines for the given |aElement| and or create it
// if it does not already exist.
static TimelineCollection* Get(const dom::Element* aElement,
PseudoStyleType aPseudoType);
const TimelineMap& Timelines() const { return mTimelines; }
// The element. Weak reference is fine since it owns us.
dom::Element& mElement;
const PseudoStyleType mPseudo;
TimelineMap mTimelines;
} // namespace mozilla
#endif // mozilla_TimelineCollection_h