зеркало из https://github.com/mozilla/gecko-dev.git
119 строки
4.0 KiB
C++
119 строки
4.0 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_AnimationTimeline_h
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#define mozilla_dom_AnimationTimeline_h
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#include "nsISupports.h"
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#include "nsWrapperCache.h"
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#include "nsCycleCollectionParticipant.h"
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#include "js/TypeDecls.h"
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#include "mozilla/AnimationUtils.h"
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#include "mozilla/Attributes.h"
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#include "nsHashKeys.h"
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#include "nsIGlobalObject.h"
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#include "nsTHashtable.h"
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namespace mozilla {
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namespace dom {
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class Animation;
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class Document;
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class AnimationTimeline : public nsISupports, public nsWrapperCache {
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public:
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explicit AnimationTimeline(nsIGlobalObject* aWindow) : mWindow(aWindow) {
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MOZ_ASSERT(mWindow);
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}
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protected:
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virtual ~AnimationTimeline();
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(AnimationTimeline)
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nsIGlobalObject* GetParentObject() const { return mWindow; }
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// AnimationTimeline methods
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virtual Nullable<TimeDuration> GetCurrentTimeAsDuration() const = 0;
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// Wrapper functions for AnimationTimeline DOM methods when called from
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// script.
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Nullable<double> GetCurrentTimeAsDouble() const {
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return AnimationUtils::TimeDurationToDouble(GetCurrentTimeAsDuration());
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}
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TimeStamp GetCurrentTimeAsTimeStamp() const {
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Nullable<TimeDuration> currentTime = GetCurrentTimeAsDuration();
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return !currentTime.IsNull() ? ToTimeStamp(currentTime.Value())
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: TimeStamp();
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}
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/**
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* Returns true if the times returned by GetCurrentTimeAsDuration() are
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* convertible to and from wallclock-based TimeStamp (e.g. from
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* TimeStamp::Now()) values using ToTimelineTime() and ToTimeStamp().
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*
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* Typically this is true, but it will be false in the case when this
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* timeline has no refresh driver or is tied to a refresh driver under test
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* control.
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*/
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virtual bool TracksWallclockTime() const = 0;
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/**
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* Converts a TimeStamp to the equivalent value in timeline time.
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* Note that when TracksWallclockTime() is false, there is no correspondence
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* between timeline time and wallclock time. In such a case, passing a
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* timestamp from TimeStamp::Now() to this method will not return a
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* meaningful result.
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*/
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virtual Nullable<TimeDuration> ToTimelineTime(
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const TimeStamp& aTimeStamp) const = 0;
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virtual TimeStamp ToTimeStamp(const TimeDuration& aTimelineTime) const = 0;
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/**
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* Inform this timeline that |aAnimation| which is or was observing the
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* timeline, has been updated. This serves as both the means to associate
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* AND disassociate animations with a timeline. The timeline itself will
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* determine if it needs to begin, continue or stop tracking this animation.
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*/
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virtual void NotifyAnimationUpdated(Animation& aAnimation);
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/**
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* Returns true if any CSS animations, CSS transitions or Web animations are
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* currently associated with this timeline. As soon as an animation is
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* applied to an element it is associated with the timeline even if it has a
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* delayed start, so this includes animations that may not be active for some
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* time.
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*/
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bool HasAnimations() const { return !mAnimations.IsEmpty(); }
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virtual void RemoveAnimation(Animation* aAnimation);
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virtual Document* GetDocument() const = 0;
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protected:
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nsCOMPtr<nsIGlobalObject> mWindow;
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// Animations observing this timeline
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//
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// We store them in (a) a hashset for quick lookup, and (b) an array
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// to maintain a fixed sampling order.
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//
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// The hashset keeps a strong reference to each animation since
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// dealing with addref/release with LinkedList is difficult.
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typedef nsTHashtable<nsRefPtrHashKey<dom::Animation>> AnimationSet;
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AnimationSet mAnimations;
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LinkedList<dom::Animation> mAnimationOrder;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_AnimationTimeline_h
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