PrincipalChangeObserver.h (904B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef MOZILLA_PRINCIPALCHANGEOBSERVER_H_ 8 #define MOZILLA_PRINCIPALCHANGEOBSERVER_H_ 9 10 namespace mozilla::dom { 11 12 /** 13 * A PrincipalChangeObserver for any type, but originating from DOMMediaStream, 14 * then expanded to MediaStreamTrack. 15 * 16 * Used to learn about dynamic changes to an object's principal. 17 * Operations relating to these observers must be confined to the main thread. 18 */ 19 template <typename T> 20 class PrincipalChangeObserver { 21 public: 22 virtual void PrincipalChanged(T* aArg) = 0; 23 }; 24 25 } // namespace mozilla::dom 26 27 #endif /* MOZILLA_PRINCIPALCHANGEOBSERVER_H_ */