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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsPIEventQueueChain_h__
#define nsPIEventQueueChain_h__
#include "nsISupports.h"
// {8f310040-82a7-11d3-95bc-0060083a0bcf}
#define NS_IEVENTQUEUECHAIN_IID \
{ 0x8f310040, 0x82a7, 0x11d3, { 0x95, 0xbc, 0x0, 0x60, 0x8, 0x3a, 0xb, 0xcf } }
class nsIEventQueue;
class nsPIEventQueueChain : public nsISupports
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IEVENTQUEUECHAIN_IID);
/**
* Add the given queue as the new youngest member of our chain.
* It will not be addrefed.
* @param aQueue the queue. must not be null.
* @return error indication
*/
NS_IMETHOD AppendQueue(nsIEventQueue *aQueue) = 0;
/**
* Remove this element from the chain.
* @return NS_OK
*/
NS_IMETHOD Unlink() = 0;
/**
* Fetch (and addref) the youngest member of the chain.
* @param *aQueue the youngest queue. aQueue must not be null.
* @return error indication
*/
NS_IMETHOD GetYoungest(nsIEventQueue **aQueue) = 0;
/**
* Fetch (and addref) the youngest member of the chain which is
* still accepting events, or at least still contains events in need
* of processing.
* @param *aQueue the youngest such queue. aQueue must not be null.
* *aQueue will be returned null, if no such queue is found.
* @return error indication -- can be NS_OK even if *aQueue is 0
*/
NS_IMETHOD GetYoungestActive(nsIEventQueue **aQueue) = 0;
NS_IMETHOD SetYounger(nsPIEventQueueChain *aQueue) = 0;
NS_IMETHOD GetYounger(nsIEventQueue **aQueue) = 0;
NS_IMETHOD SetElder(nsPIEventQueueChain *aQueue) = 0;
NS_IMETHOD GetElder(nsIEventQueue **aQueue) = 0;
};
#endif /* nsPIEventQueueChain_h___ */
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