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 {
  14 namespace dom {
  15
  16 /**
  17  * Implementation for the WebIDL MessageBroadcaster interface. Base class for
  18  * window and process broadcaster message managers.
  19  */
  20 class MessageBroadcaster : public MessageListenerManager {
  21  public:
  22   static MessageBroadcaster* From(MessageListenerManager* aManager) {
  23     if (aManager->IsBroadcaster()) {
  24       return static_cast<MessageBroadcaster*>(aManager);
  25     }
  26     return nullptr;
  27   }
  28
  29   void BroadcastAsyncMessage(JSContext* aCx, const nsAString& aMessageName,
  30                              JS::Handle<JS::Value> aObj,
  31                              mozilla::ErrorResult& aError) {
  32     DispatchAsyncMessage(aCx, aMessageName, aObj, JS::UndefinedHandleValue,
  33                          aError);
  34   }
  35   uint32_t ChildCount() { return mChildManagers.Length(); }
  36   MessageListenerManager* GetChildAt(uint32_t aIndex) {
  37     return mChildManagers.SafeElementAt(aIndex);
  38   }
  39   void ReleaseCachedProcesses();
  40
  41   void AddChildManager(MessageListenerManager* aManager);
  42   void RemoveChildManager(MessageListenerManager* aManager);
  43
  44  protected:
  45   MessageBroadcaster(MessageBroadcaster* aParentManager,
  46                      MessageManagerFlags aFlags);
  47 };
  48
  49 }  // namespace dom
  50 }  // namespace mozilla
  51
  52 #endif  // mozilla_dom_MessageBroadcaster_h