gecko-dev/dom/base/DOMIntersectionObserver.h

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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 "nsStyleCoord.h"
#include "nsTArray.h"
using mozilla::dom::DOMRect;
using mozilla::dom::Element;
namespace mozilla {
namespace dom {
class DOMIntersectionObserver;
class DOMIntersectionObserverEntry final : public nsISupports,
public nsWrapperCache {
~DOMIntersectionObserverEntry() {}
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(aRootBounds),
mBoundingClientRect(aBoundingClientRect),
mIntersectionRect(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; }
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override {
return mozilla::dom::IntersectionObserverEntry_Binding::Wrap(aCx, this,
aGivenProto);
}
DOMHighResTimeStamp Time() { return mTime; }
DOMRect* GetRootBounds() { return mRootBounds; }
DOMRect* BoundingClientRect() { return mBoundingClientRect; }
DOMRect* IntersectionRect() { return mIntersectionRect; }
bool IsIntersecting() { return mIsIntersecting; }
double IntersectionRatio() { 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(); }
public:
DOMIntersectionObserver(already_AddRefed<nsPIDOMWindowInner>&& aOwner,
mozilla::dom::IntersectionCallback& aCb)
: mOwner(aOwner),
mDocument(mOwner->GetExtantDoc()),
mCallback(&aCb),
mConnected(false) {}
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 mozilla::dom::GlobalObject& aGlobal,
mozilla::dom::IntersectionCallback& aCb, mozilla::ErrorResult& aRv);
static already_AddRefed<DOMIntersectionObserver> Constructor(
const mozilla::dom::GlobalObject& aGlobal,
mozilla::dom::IntersectionCallback& aCb,
const mozilla::dom::IntersectionObserverInit& aOptions,
mozilla::ErrorResult& aRv);
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override {
return mozilla::dom::IntersectionObserver_Binding::Wrap(aCx, this,
aGivenProto);
}
nsISupports* GetParentObject() const { return mOwner; }
Element* GetRoot() const { return mRoot; }
void GetRootMargin(mozilla::dom::DOMString& aRetVal);
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);
mozilla::dom::IntersectionCallback* IntersectionCallback() {
return mCallback;
}
bool SetRootMargin(const nsAString& aString);
void Update(Document* aDocument, DOMHighResTimeStamp time);
MOZ_CAN_RUN_SCRIPT void Notify();
protected:
void Connect();
void QueueIntersectionObserverEntry(Element* aTarget,
DOMHighResTimeStamp time,
const Maybe<nsRect>& aRootRect,
const nsRect& aTargetRect,
const Maybe<nsRect>& aIntersectionRect,
double aIntersectionRatio);
nsCOMPtr<nsPIDOMWindowInner> mOwner;
RefPtr<Document> mDocument;
RefPtr<mozilla::dom::IntersectionCallback> mCallback;
RefPtr<Element> 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