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lightning-sunbird  0.9+nobinonly
nsEventQueue.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla Communicator client code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Pierre Phaneuf <pp@ludusdesign.com>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "prmon.h"
00040 #include "nsIEventQueue.h"
00041 #include "nsPIEventQueueChain.h"
00042 
00043 class nsEventQueueImpl : public nsIEventQueue,
00044                          public nsPIEventQueueChain
00045 {
00046 public:
00047     nsEventQueueImpl();
00048 
00049     NS_DECL_ISUPPORTS
00050     NS_DECL_NSIEVENTTARGET
00051     NS_DECL_NSIEVENTQUEUE
00052 
00053     // Helpers
00054     static NS_METHOD Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
00055 
00056     static const nsCID& CID() { static nsCID cid = NS_EVENTQUEUE_CID; return cid; }
00057 
00058     // nsPIEventQueueChain interface
00059     NS_IMETHOD AppendQueue(nsIEventQueue *aQueue);
00060     NS_IMETHOD Unlink();
00061     NS_IMETHOD GetYoungest(nsIEventQueue **aQueue);
00062     NS_IMETHOD GetYoungestActive(nsIEventQueue **aQueue);
00063     NS_IMETHOD SetYounger(nsPIEventQueueChain *aQueue);
00064     NS_IMETHOD GetYounger(nsIEventQueue **aQueue);
00065     NS_IMETHOD SetElder(nsPIEventQueueChain *aQueue);
00066     NS_IMETHOD GetElder(nsIEventQueue **aQueue);
00067     NS_IMETHOD RevokeEventsInternal(void* aOwner);
00068 
00069 private:
00070     ~nsEventQueueImpl();
00071 
00072   PLEventQueue  *mEventQueue;
00073   PRBool        mAcceptingEvents, // accept new events or pass them on?
00074                 mCouldHaveEvents; // accepting new ones, or still have old ones?
00075   nsCOMPtr<nsPIEventQueueChain> mElderQueue; // younger can hold on to elder
00076   nsPIEventQueueChain *mYoungerQueue; // but elder can't hold on to younger
00077 
00078   void NotifyObservers(const char *aTopic);
00079   void CheckForDeactivation();
00080 };