EventListenerService.h

Enable keyboard shortcuts

/* -*- 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_EventListenerService_h_

#define mozilla_EventListenerService_h_

#include "jsapi.h"

#include "mozilla/Attributes.h"

#include "nsCycleCollectionParticipant.h"

#include "EventListenerManager.h"

#include "nsIEventListenerService.h"

#include "nsString.h"

#include "nsTObserverArray.h"

#include "nsTHashMap.h"

#include "nsGkAtoms.h"

class nsIMutableArray;

namespace mozilla {

namespace dom {

class EventTarget;

}  // namespace dom

template <typename T>

class Maybe;

class EventListenerChange final : public nsIEventListenerChange {

 public:

  explicit EventListenerChange(dom::EventTarget* aTarget);

  void AddChangedListenerName(nsAtom* aEventName);

  NS_DECL_ISUPPORTS

  NS_DECL_NSIEVENTLISTENERCHANGE

 protected:

  virtual ~EventListenerChange();

  nsCOMPtr<dom::EventTarget> mTarget;

  nsTArray<RefPtr<nsAtom>> mChangedListenerNames;

};

class EventListenerInfo final : public nsIEventListenerInfo {

 public:

  EventListenerInfo(EventListenerManager* aListenerManager,

                    const nsAString& aType,

                    JS::Handle<JSObject*> aScriptedListener,

                    JS::Handle<JSObject*> aScriptedListenerGlobal,

                    bool aCapturing, bool aAllowsUntrusted,

                    bool aInSystemEventGroup, bool aIsHandler);

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(EventListenerInfo)

  NS_DECL_NSIEVENTLISTENERINFO

 protected:

  virtual ~EventListenerInfo();

  bool GetJSVal(JSContext* aCx, Maybe<JSAutoRealm>& aAr,

                JS::MutableHandle<JS::Value> aJSVal);

  RefPtr<EventListenerManager> mListenerManager;

  nsString mType;

  JS::Heap<JSObject*> mScriptedListener;  // May be null.

  // mScriptedListener may be a cross-compartment wrapper so we cannot use it

  // with JSAutoRealm because CCWs are not associated with a single realm. We

  // use this global instead (must be same-compartment with mScriptedListener

  // and must be non-null if mScriptedListener is non-null).

  JS::Heap<JSObject*> mScriptedListenerGlobal;

  bool mCapturing;

  bool mAllowsUntrusted;

  bool mInSystemEventGroup;

  bool mIsHandler;

};

class EventListenerService final : public nsIEventListenerService {

  ~EventListenerService();

 public:

  EventListenerService();

  NS_DECL_ISUPPORTS

  NS_DECL_NSIEVENTLISTENERSERVICE

  static void NotifyAboutMainThreadListenerChange(dom::EventTarget* aTarget,

                                                  nsAtom* aName) {

    if (sInstance) {

      sInstance->NotifyAboutMainThreadListenerChangeInternal(aTarget, aName);

  void NotifyPendingChanges();

 private:

  void NotifyAboutMainThreadListenerChangeInternal(dom::EventTarget* aTarget,

                                                   nsAtom* aName);

  nsTObserverArray<nsCOMPtr<nsIListenerChangeListener>> mChangeListeners;

  nsCOMPtr<nsIMutableArray> mPendingListenerChanges;

  nsTHashMap<nsISupportsHashKey, RefPtr<EventListenerChange>>

      mPendingListenerChangesSet;

  static EventListenerService* sInstance;

};

}  // namespace mozilla

#endif  // mozilla_EventListenerService_h_