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115 lines
3.5 KiB
C++
115 lines
3.5 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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// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
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// GetTickCount().
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#ifdef GetCurrentTime
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#undef GetCurrentTime
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#endif
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namespace mozilla {
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namespace dom {
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class Animation;
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class AnimationTimeline
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: public nsISupports
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, public nsWrapperCache
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{
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public:
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explicit AnimationTimeline(nsIGlobalObject* aWindow)
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: mWindow(aWindow)
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{
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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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{
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mAnimationOrder.clear();
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}
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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> GetCurrentTime() 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(GetCurrentTime());
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}
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/**
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* Returns true if the times returned by GetCurrentTime() are convertible
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* to and from wallclock-based TimeStamp (e.g. from TimeStamp::Now()) values
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* 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(const TimeStamp&
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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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void RemoveAnimation(Animation* aAnimation);
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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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