dom/base/MessageBroadcaster.h

   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_dom_MessageBroadcaster_h
   8 #define mozilla_dom_MessageBroadcaster_h
   9
  10 #include "mozilla/dom/MessageListenerManager.h"
  11 #include "nsContentUtils.h"
  12
  13 namespace mozilla::dom {
  14
  15 /**
  16  * Implementation for the WebIDL MessageBroadcaster interface. Base class for
  17  * window and process broadcaster message managers.
  18  */
  19 class MessageBroadcaster : public MessageListenerManager {
  20  public:
  21   static MessageBroadcaster* From(MessageListenerManager* aManager) {
  22     if (aManager->IsBroadcaster()) {
  23       return static_cast<MessageBroadcaster*>(aManager);
  24     }
  25     return nullptr;
  26   }
  27
  28   void BroadcastAsyncMessage(JSContext* aCx, const nsAString& aMessageName,
  29                              JS::Handle<JS::Value> aObj,
  30                              mozilla::ErrorResult& aError) {
  31     DispatchAsyncMessage(aCx, aMessageName, aObj, JS::UndefinedHandleValue,
  32                          aError);
  33   }
  34   uint32_t ChildCount() { return mChildManagers.Length(); }
  35   MessageListenerManager* GetChildAt(uint32_t aIndex) {
  36     return mChildManagers.SafeElementAt(aIndex);
  37   }
  38   void ReleaseCachedProcesses();
  39
  40   void AddChildManager(MessageListenerManager* aManager);
  41   void RemoveChildManager(MessageListenerManager* aManager);
  42
  43  protected:
  44   MessageBroadcaster(MessageBroadcaster* aParentManager,
  45                      MessageManagerFlags aFlags);
  46 };
  47
  48 }  // namespace mozilla::dom
  49
  50 #endif  // mozilla_dom_MessageBroadcaster_h