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87 lines
3.4 KiB
C++
87 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "prmon.h"
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#include "nsIEventQueue.h"
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#include "nsPIEventQueueChain.h"
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class nsEventQueueImpl : public nsIEventQueue,
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public nsPIEventQueueChain
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{
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public:
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nsEventQueueImpl();
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virtual ~nsEventQueueImpl();
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// nsISupports interface...
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NS_DECL_ISUPPORTS
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// nsIEventQueue interface...
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NS_DECL_NSIEVENTQUEUE
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// Helpers
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static NS_METHOD Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
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static const nsCID& CID() { static nsCID cid = NS_EVENTQUEUE_CID; return cid; }
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// nsPIEventQueueChain interface
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NS_IMETHOD AppendQueue(nsIEventQueue *aQueue);
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NS_IMETHOD Unlink();
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NS_IMETHOD GetYoungest(nsIEventQueue **aQueue);
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NS_IMETHOD GetYoungestActive(nsIEventQueue **aQueue);
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NS_IMETHOD SetYounger(nsPIEventQueueChain *aQueue);
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NS_IMETHOD GetYounger(nsIEventQueue **aQueue);
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NS_IMETHOD SetElder(nsPIEventQueueChain *aQueue);
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NS_IMETHOD GetElder(nsIEventQueue **aQueue);
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private:
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PLEventQueue *mEventQueue;
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PRBool mAcceptingEvents, // accept new events or pass them on?
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mCouldHaveEvents; // accepting new ones, or still have old ones?
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nsCOMPtr<nsPIEventQueueChain> mElderQueue; // younger can hold on to elder
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nsPIEventQueueChain *mYoungerQueue; // but elder can't hold on to younger
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void NotifyObservers(const char *aTopic);
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void CheckForDeactivation() {
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if (mCouldHaveEvents && !mAcceptingEvents && !PL_EventAvailable(mEventQueue)) {
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mCouldHaveEvents = PR_FALSE;
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NS_RELEASE_THIS(); // balance ADDREF from the constructor
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}
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}
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};
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