gecko-dev/dom/animation/DocumentTimeline.h

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2.6 KiB
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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 http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_DocumentTimeline_h
#define mozilla_dom_DocumentTimeline_h
#include "mozilla/TimeStamp.h"
#include "AnimationTimeline.h"
#include "nsIDocument.h"
#include "nsRefreshDriver.h"
struct JSContext;
namespace mozilla {
namespace dom {
class DocumentTimeline final : public AnimationTimeline
{
public:
explicit DocumentTimeline(nsIDocument* aDocument)
: AnimationTimeline(aDocument->GetParentObject())
, mDocument(aDocument)
{
}
protected:
virtual ~DocumentTimeline() { }
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(DocumentTimeline,
AnimationTimeline)
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
// DocumentTimeline methods
virtual Nullable<TimeDuration> GetCurrentTime() const override;
// Converts a TimeStamp to the equivalent value in timeline time.
// Note that when IsUnderTestControl() is true, 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.
Nullable<TimeDuration> ToTimelineTime(const TimeStamp& aTimeStamp) const;
TimeStamp ToTimeStamp(const TimeDuration& aTimelineTime) const;
nsRefreshDriver* GetRefreshDriver() const;
// Returns true if this timeline is driven by a refresh driver that is
// under test control. In such a case, there is no correspondence between
// TimeStamp values returned by the refresh driver and wallclock time.
// As a result, passing a value from TimeStamp::Now() to ToTimelineTime()
// would not return a meaningful result.
bool IsUnderTestControl() const
{
nsRefreshDriver* refreshDriver = GetRefreshDriver();
return refreshDriver && refreshDriver->IsTestControllingRefreshesEnabled();
}
protected:
TimeStamp GetCurrentTimeStamp() const;
nsCOMPtr<nsIDocument> mDocument;
// The most recently used refresh driver time. This is used in cases where
// we don't have a refresh driver (e.g. because we are in a display:none
// iframe).
mutable TimeStamp mLastRefreshDriverTime;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_DocumentTimeline_h