зеркало из https://github.com/mozilla/gecko-dev.git
84 строки
2.3 KiB
C++
84 строки
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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// SystemEvents.h
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//
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// Scott M. Silver
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//
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// EventListener and EventBroadcaster which work together
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// to distribute interesting events around a system.
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class EventListener;
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class EventBroadcaster
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{
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Vector<EventListener*> mListeners;
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void addListener(EventListener& inListener) { mListeners.append(&inListener); }
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void removeListener(EventListener& inListener) { }
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void broadcastEvent(BroadcastEventKind inKind, void* inArgument);
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static EventBroadcaster& checkAllocated(EventBroadcaster*& ioBroadcaster)
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{
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if (!ioBroadcaster)
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ioBroadcaster = new EventBroadcaster();
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return *ioBroadcaster;
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}
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public:
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static void addListener(EventBroadcaster*& ioBroadcaster, EventListener& inListener)
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{
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checkAllocated(ioBroadcaster).addListener(inListener);
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}
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static void broadcastEvent(EventBroadcaster*& ioBroadcaster, BroadcastEventKind inKind, void* inArgument)
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{
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checkAllocated(ioBroadcaster).broadcastEvent(inKind, inArgument);
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}
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static void removeListener(EventBroadcaster*& ioBroadcaster, EventListener& inListener)
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{
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checkAllocated(ioBroadcaster).removeListener(inListener);
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}
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};
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class EventListener
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{
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#ifdef DEBUG
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Vector<EventBroadcaster*> mBroadcasters;
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#endif
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public:
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EventListener(EventBroadcaster*& ioBroadcaster)
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{
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ioBroadcaster->addListener(ioBroadcaster, *this);
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}
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~EventListener() { }
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virtual void listenToMessage(BroadcastEventKind inKind, void* inArgument) = 0;
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};
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