mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 00:25:27 +00:00
84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public
|
|
* License Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* rights and limitations under the License.
|
|
*
|
|
* The Original Code is mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
|
|
// SystemEvents.h
|
|
//
|
|
// Scott M. Silver
|
|
//
|
|
|
|
// EventListener and EventBroadcaster which work together
|
|
// to distribute interesting events around a system.
|
|
|
|
class EventListener;
|
|
class EventBroadcaster
|
|
{
|
|
Vector<EventListener*> mListeners;
|
|
void addListener(EventListener& inListener) { mListeners.append(&inListener); }
|
|
void removeListener(EventListener& inListener) { }
|
|
void broadcastEvent(BroadcastEventKind inKind, void* inArgument);
|
|
|
|
static EventBroadcaster& checkAllocated(EventBroadcaster*& ioBroadcaster)
|
|
{
|
|
if (!ioBroadcaster)
|
|
ioBroadcaster = new EventBroadcaster();
|
|
|
|
return *ioBroadcaster;
|
|
}
|
|
|
|
public:
|
|
static void addListener(EventBroadcaster*& ioBroadcaster, EventListener& inListener)
|
|
{
|
|
checkAllocated(ioBroadcaster).addListener(inListener);
|
|
}
|
|
|
|
static void broadcastEvent(EventBroadcaster*& ioBroadcaster, BroadcastEventKind inKind, void* inArgument)
|
|
{
|
|
checkAllocated(ioBroadcaster).broadcastEvent(inKind, inArgument);
|
|
}
|
|
|
|
static void removeListener(EventBroadcaster*& ioBroadcaster, EventListener& inListener)
|
|
{
|
|
checkAllocated(ioBroadcaster).removeListener(inListener);
|
|
}
|
|
|
|
};
|
|
|
|
|
|
class EventListener
|
|
{
|
|
#ifdef DEBUG
|
|
Vector<EventBroadcaster*> mBroadcasters;
|
|
#endif
|
|
|
|
|
|
public:
|
|
EventListener(EventBroadcaster*& ioBroadcaster)
|
|
{
|
|
ioBroadcaster->addListener(ioBroadcaster, *this);
|
|
}
|
|
|
|
|
|
~EventListener() { }
|
|
|
|
virtual void listenToMessage(BroadcastEventKind inKind, void* inArgument) = 0;
|
|
};
|