DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (0bb0f14672fd)

VCS Links

DOMIntersectionObserver

DOMIntersectionObserverEntry

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200
/* -*- 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/dom/IntersectionObserverBinding.h"
#include "nsCSSValue.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::IntersectionObserverEntryBinding::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),
    mRoot(nullptr),
    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::IntersectionObserverBinding::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 UnlinkElement(Element& aTarget);
  void Disconnect();

  void TakeRecords(nsTArray<RefPtr<DOMIntersectionObserverEntry>>& aRetVal);

  mozilla::dom::IntersectionCallback* IntersectionCallback() { return mCallback; }

  bool SetRootMargin(const nsAString& aString);

  void Update(nsIDocument* aDocument, DOMHighResTimeStamp time);
  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<nsIDocument>                             mDocument;
  RefPtr<mozilla::dom::IntersectionCallback>      mCallback;
  // Raw pointer which is explicitly cleared by UnlinkElement().
  Element*                                        mRoot;
  nsCSSRect                                       mRootMargin;
  nsTArray<double>                                mThresholds;

  // Holds raw pointers which are explicitly cleared by UnlinkElement().
  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