third_party/WebKit/Source/modules/netinfo/NetworkInformation.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NetworkInformation_h
#define NetworkInformation_h

#include "bindings/core/v8/ActiveScriptWrappable.h"
#include "core/dom/ActiveDOMObject.h"
#include "core/events/EventTarget.h"
#include "core/page/NetworkStateNotifier.h"
#include "public/platform/WebConnectionType.h"

namespace blink {

class ExecutionContext;

class NetworkInformation final
    : public EventTargetWithInlineData,
      public ActiveScriptWrappable,
      public ActiveDOMObject,
      public NetworkStateNotifier::NetworkStateObserver {
  USING_GARBAGE_COLLECTED_MIXIN(NetworkInformation);
  DEFINE_WRAPPERTYPEINFO();

 public:
  static NetworkInformation* create(ExecutionContext*);
  ~NetworkInformation() override;

  String type() const;
  double downlinkMax() const;

  // NetworkStateObserver overrides.
  void connectionChange(WebConnectionType, double downlinkMaxMbps) override;

  // EventTarget overrides.
  const AtomicString& interfaceName() const override;
  ExecutionContext* getExecutionContext() const override;
  void removeAllEventListeners() override;

  // ScriptWrappable
  bool hasPendingActivity() const final;

  // ActiveDOMObject overrides.
  void contextDestroyed() override;

  DECLARE_VIRTUAL_TRACE();

  DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
  DEFINE_ATTRIBUTE_EVENT_LISTENER(typechange);  // Deprecated

 protected:
  // EventTarget overrides.
  void addedEventListener(const AtomicString& eventType,
                          RegisteredEventListener&) final;
  void removedEventListener(const AtomicString& eventType,
                            const RegisteredEventListener&) final;

 private:
  explicit NetworkInformation(ExecutionContext*);
  void startObserving();
  void stopObserving();

  // Touched only on context thread.
  WebConnectionType m_type;

  // Touched only on context thread.
  double m_downlinkMaxMbps;

  // Whether this object is listening for events from NetworkStateNotifier.
  bool m_observing;

  // Whether ActiveDOMObject::stop has been called.
  bool m_contextStopped;
};

}  // namespace blink

#endif  // NetworkInformation_h