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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 DOMIntersectionObserver_h
#define DOMIntersectionObserver_h
#include "mozilla/Attributes.h"
#include "mozilla/dom/IntersectionObserverBinding.h"
#include "mozilla/ServoStyleConsts.h"
#include "mozilla/Variant.h"
#include "nsDOMNavigationTiming.h"
#include "nsTArray.h"
namespace mozilla {
namespace dom {
class DOMIntersectionObserver;
class DOMIntersectionObserverEntry final : public nsISupports,
public nsWrapperCache {
~DOMIntersectionObserverEntry() = default;
public:
DOMIntersectionObserverEntry(nsISupports* aOwner, DOMHighResTimeStamp aTime,
RefPtr<DOMRect> aRootBounds,
RefPtr<DOMRect> aBoundingClientRect,
RefPtr<DOMRect> aIntersectionRect,
bool aIsIntersecting, Element* aTarget,
double aIntersectionRatio)
: mOwner(aOwner),
mTime(aTime),
mRootBounds(std::move(aRootBounds)),
mBoundingClientRect(std::move(aBoundingClientRect)),
mIntersectionRect(std::move(aIntersectionRect)),
mIsIntersecting(aIsIntersecting),
mTarget(aTarget),
mIntersectionRatio(aIntersectionRatio) {}
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMIntersectionObserverEntry)
nsISupports* GetParentObject() const { return mOwner; }
JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override {
return IntersectionObserverEntry_Binding::Wrap(aCx, this, aGivenProto);
}
DOMHighResTimeStamp Time() const { return mTime; }
DOMRect* GetRootBounds() { return mRootBounds; }
DOMRect* BoundingClientRect() { return mBoundingClientRect; }
DOMRect* IntersectionRect() { return mIntersectionRect; }
bool IsIntersecting() const { return mIsIntersecting; }
double IntersectionRatio() const { return mIntersectionRatio; }
Element* Target() { return mTarget; }
protected:
nsCOMPtr<nsISupports> mOwner;
DOMHighResTimeStamp mTime;
RefPtr<DOMRect> mRootBounds;
RefPtr<DOMRect> mBoundingClientRect;
RefPtr<DOMRect> mIntersectionRect;
bool mIsIntersecting;
RefPtr<Element> mTarget;
double mIntersectionRatio;
};
#define NS_DOM_INTERSECTION_OBSERVER_IID \
{ \
0x8570a575, 0xe303, 0x4d18, { \
0xb6, 0xb1, 0x4d, 0x2b, 0x49, 0xd8, 0xef, 0x94 \
} \
}
class DOMIntersectionObserver final : public nsISupports,
public nsWrapperCache {
virtual ~DOMIntersectionObserver() { Disconnect(); }
typedef void (*NativeCallback)(
const Sequence<OwningNonNull<DOMIntersectionObserverEntry>>& aEntries);
DOMIntersectionObserver(Document&, NativeCallback);
public:
DOMIntersectionObserver(already_AddRefed<nsPIDOMWindowInner>&& aOwner,
dom::IntersectionCallback& aCb);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMIntersectionObserver)
NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOM_INTERSECTION_OBSERVER_IID)
static already_AddRefed<DOMIntersectionObserver> Constructor(
const GlobalObject&, dom::IntersectionCallback&, ErrorResult&);
static already_AddRefed<DOMIntersectionObserver> Constructor(
const GlobalObject&, dom::IntersectionCallback&,
const IntersectionObserverInit&, ErrorResult&);
JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override {
return IntersectionObserver_Binding::Wrap(aCx, this, aGivenProto);
}
nsISupports* GetParentObject() const;
nsINode* GetRoot() const { return mRoot; }
void GetRootMargin(nsACString&);
bool SetRootMargin(const nsACString&);
void GetThresholds(nsTArray<double>& aRetVal);
void Observe(Element& aTarget);
void Unobserve(Element& aTarget);
void UnlinkTarget(Element& aTarget);
void Disconnect();
void TakeRecords(nsTArray<RefPtr<DOMIntersectionObserverEntry>>& aRetVal);
void Update(Document* aDocument, DOMHighResTimeStamp time);
MOZ_CAN_RUN_SCRIPT void Notify();
static already_AddRefed<DOMIntersectionObserver> CreateLazyLoadObserver(
Document&);
protected:
void Connect();
void QueueIntersectionObserverEntry(Element* aTarget,
DOMHighResTimeStamp time,
const Maybe<nsRect>& aRootRect,
const nsRect& aTargetRect,
const Maybe<nsRect>& aIntersectionRect,
bool aIsIntersecting,
double aIntersectionRatio);
nsCOMPtr<nsPIDOMWindowInner> mOwner;
RefPtr<Document> mDocument;
Variant<RefPtr<dom::IntersectionCallback>, NativeCallback> mCallback;
RefPtr<nsINode> mRoot;
StyleRect<LengthPercentage> mRootMargin;
nsTArray<double> mThresholds;
// Holds raw pointers which are explicitly cleared by UnlinkTarget().
nsTArray<Element*> mObservationTargets;
nsTArray<RefPtr<DOMIntersectionObserverEntry>> mQueuedEntries;
bool mConnected;
};
NS_DEFINE_STATIC_IID_ACCESSOR(DOMIntersectionObserver,
NS_DOM_INTERSECTION_OBSERVER_IID)
} // namespace dom
} // namespace mozilla
#endif
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