gecko-dev/dom/animation/AnimationTimeline.h

95 lines
2.8 KiB
C++

/* -*- 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 http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_AnimationTimeline_h
#define mozilla_dom_AnimationTimeline_h
#include "nsISupports.h"
#include "nsWrapperCache.h"
#include "nsCycleCollectionParticipant.h"
#include "js/TypeDecls.h"
#include "mozilla/AnimationUtils.h"
#include "mozilla/Attributes.h"
#include "nsHashKeys.h"
#include "nsIGlobalObject.h"
#include "nsTHashtable.h"
namespace mozilla {
namespace dom {
class Animation;
class AnimationTimeline
: public nsISupports
, public nsWrapperCache
{
public:
explicit AnimationTimeline(nsIGlobalObject* aWindow)
: mWindow(aWindow)
{
MOZ_ASSERT(mWindow);
}
protected:
virtual ~AnimationTimeline() { }
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(AnimationTimeline)
nsIGlobalObject* GetParentObject() const { return mWindow; }
typedef nsTArray<nsRefPtr<Animation>> AnimationSequence;
// AnimationTimeline methods
virtual Nullable<TimeDuration> GetCurrentTime() const = 0;
void GetAnimations(AnimationSequence& aAnimations);
// Wrapper functions for AnimationTimeline DOM methods when called from
// script.
Nullable<double> GetCurrentTimeAsDouble() const {
return AnimationUtils::TimeDurationToDouble(GetCurrentTime());
}
/**
* Returns true if the times returned by GetCurrentTime() are convertible
* to and from wallclock-based TimeStamp (e.g. from TimeStamp::Now()) values
* using ToTimelineTime() and ToTimeStamp().
*
* Typically this is true, but it will be false in the case when this
* timeline has no refresh driver or is tied to a refresh driver under test
* control.
*/
virtual bool TracksWallclockTime() const = 0;
/**
* Converts a TimeStamp to the equivalent value in timeline time.
* Note that when TracksWallclockTime() is false, there is no correspondence
* between timeline time and wallclock time. In such a case, passing a
* timestamp from TimeStamp::Now() to this method will not return a
* meaningful result.
*/
virtual Nullable<TimeDuration> ToTimelineTime(const TimeStamp&
aTimeStamp) const = 0;
virtual TimeStamp ToTimeStamp(const TimeDuration& aTimelineTime) const = 0;
void AddAnimation(Animation& aAnimation);
void RemoveAnimation(Animation& aAnimation);
protected:
nsCOMPtr<nsIGlobalObject> mWindow;
// Animations observing this timeline
typedef nsTHashtable<nsRefPtrHashKey<dom::Animation>> AnimationSet;
AnimationSet mAnimations;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_AnimationTimeline_h