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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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 Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* 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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#ifndef nsPIEventQueueChain_h__
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#define nsPIEventQueueChain_h__
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#include "nsISupports.h"
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// {8f310040-82a7-11d3-95bc-0060083a0bcf}
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#define NS_IEVENTQUEUECHAIN_IID \
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{ 0x8f310040, 0x82a7, 0x11d3, { 0x95, 0xbc, 0x0, 0x60, 0x8, 0x3a, 0xb, 0xcf } }
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class nsIEventQueue;
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class nsPIEventQueueChain : public nsISupports
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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IEVENTQUEUECHAIN_IID);
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/**
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* Add the given queue as the new youngest member of our chain.
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* It will not be addrefed.
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* @param aQueue the queue. must not be null.
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* @return error indication
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*/
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NS_IMETHOD AppendQueue(nsIEventQueue *aQueue) = 0;
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/**
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* Remove this element from the chain.
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* @return NS_OK
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*/
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NS_IMETHOD Unlink() = 0;
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/**
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* Fetch (and addref) the youngest member of the chain.
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* @param *aQueue the youngest queue. aQueue must not be null.
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* @return error indication
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*/
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NS_IMETHOD GetYoungest(nsIEventQueue **aQueue) = 0;
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/**
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* Fetch (and addref) the youngest member of the chain which is
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* still accepting events, or at least still contains events in need
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* of processing.
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* @param *aQueue the youngest such queue. aQueue must not be null.
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* *aQueue will be returned null, if no such queue is found.
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* @return error indication -- can be NS_OK even if *aQueue is 0
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*/
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NS_IMETHOD GetYoungestActive(nsIEventQueue **aQueue) = 0;
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NS_IMETHOD SetYounger(nsPIEventQueueChain *aQueue) = 0;
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NS_IMETHOD SetElder(nsPIEventQueueChain *aQueue) = 0;
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};
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#endif /* nsPIEventQueueChain_h___ */
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