зеркало из https://github.com/mozilla/gecko-dev.git
110 строки
3.6 KiB
C++
110 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_PendingAnimationTracker_h
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#define mozilla_dom_PendingAnimationTracker_h
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#include "mozilla/dom/Animation.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsIDocument.h"
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#include "nsTHashtable.h"
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class nsIFrame;
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namespace mozilla {
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class PendingAnimationTracker final
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{
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public:
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explicit PendingAnimationTracker(nsIDocument* aDocument)
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: mDocument(aDocument)
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{ }
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NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(PendingAnimationTracker)
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NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(PendingAnimationTracker)
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void AddPlayPending(dom::Animation& aAnimation)
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{
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// We'd like to assert here that IsWaitingToPause(aAnimation) is false but
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// if |aAnimation| was tracked here as a pause-pending animation when it was
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// removed from |mDocument|, then re-attached to |mDocument|, and then
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// played again, we could end up here with IsWaitingToPause returning true.
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//
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// However, that should be harmless since all it means is that we'll call
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// Animation::TriggerOnNextTick or Animation::TriggerNow twice, both of
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// which will handle the redundant call gracefully.
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AddPending(aAnimation, mPlayPendingSet);
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mHasPlayPendingGeometricAnimations = CheckState::Indeterminate;
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}
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void RemovePlayPending(dom::Animation& aAnimation)
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{
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RemovePending(aAnimation, mPlayPendingSet);
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mHasPlayPendingGeometricAnimations = CheckState::Indeterminate;
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}
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bool IsWaitingToPlay(const dom::Animation& aAnimation) const
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{
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return IsWaiting(aAnimation, mPlayPendingSet);
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}
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void AddPausePending(dom::Animation& aAnimation)
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{
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// As with AddPausePending, we'd like to assert that
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// IsWaitingToPlay(aAnimation) is false but there are some circumstances
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// where this can be true. Fortunately adding the animation to both pending
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// sets should be harmless.
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AddPending(aAnimation, mPausePendingSet);
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}
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void RemovePausePending(dom::Animation& aAnimation)
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{
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RemovePending(aAnimation, mPausePendingSet);
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}
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bool IsWaitingToPause(const dom::Animation& aAnimation) const
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{
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return IsWaiting(aAnimation, mPausePendingSet);
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}
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void TriggerPendingAnimationsOnNextTick(const TimeStamp& aReadyTime);
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void TriggerPendingAnimationsNow();
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bool HasPendingAnimations() const {
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return mPlayPendingSet.Count() > 0 || mPausePendingSet.Count() > 0;
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}
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/**
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* Looks amongst the set of play-pending animations, and, if there are
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* animations that affect geometric properties, notifies all play-pending
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* animations so that they can be synchronized, if needed.
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*/
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void MarkAnimationsThatMightNeedSynchronization();
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private:
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~PendingAnimationTracker() { }
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bool HasPlayPendingGeometricAnimations();
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void EnsurePaintIsScheduled();
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typedef nsTHashtable<nsRefPtrHashKey<dom::Animation>> AnimationSet;
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void AddPending(dom::Animation& aAnimation, AnimationSet& aSet);
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void RemovePending(dom::Animation& aAnimation, AnimationSet& aSet);
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bool IsWaiting(const dom::Animation& aAnimation,
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const AnimationSet& aSet) const;
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AnimationSet mPlayPendingSet;
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AnimationSet mPausePendingSet;
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nsCOMPtr<nsIDocument> mDocument;
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enum class CheckState {
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Indeterminate,
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Absent,
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Present
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};
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CheckState mHasPlayPendingGeometricAnimations = CheckState::Indeterminate;
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};
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} // namespace mozilla
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#endif // mozilla_dom_PendingAnimationTracker_h
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