BackgroundVideoDecodingPermissionObserver.h

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/* vim:set ts=2 sw=2 sts=2 et cindent: */

/* 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/. */

#if !defined(BackgroundVideoDecodingPermissionObserver_h_)

#  define BackgroundVideoDecodingPermissionObserver_h_

#  include "nsIObserver.h"

#  include "nsISupportsImpl.h"

class nsISupports;

class nsPIDOMWindowOuter;

namespace mozilla {

namespace dom {

class Document;

class BrowsingContext;

}  // namespace dom

class MediaDecoder;

class BackgroundVideoDecodingPermissionObserver final : public nsIObserver {

 public:

  NS_DECL_ISUPPORTS

  explicit BackgroundVideoDecodingPermissionObserver(MediaDecoder* aDecoder);

  NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,

                     const char16_t* aData) override;

  void RegisterEvent();

  void UnregisterEvent();

 private:

  ~BackgroundVideoDecodingPermissionObserver();

  void EnableEvent() const;

  void DisableEvent() const;

  dom::BrowsingContext* GetOwnerBC() const;

  dom::Document* GetOwnerDoc() const;

  bool IsValidEventSender(nsISupports* aSubject) const;

  // The life cycle of observer would always be shorter than decoder, so we

  // use raw pointer here.

  MediaDecoder* mDecoder;

  bool mIsRegisteredForEvent;

};

}  // namespace mozilla

#endif  // BackgroundVideoDecodingPermissionObserver_h_