pjs/xpcom/threads/nsEventQueue.h

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2.4 KiB
C++

/* -*- Mode: C++; tab-width: 2; 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 Communicator client 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):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#include "prmon.h"
#include "nsIEventQueue.h"
#include "nsPIEventQueueChain.h"
class nsEventQueueImpl : public nsIEventQueue,
public nsPIEventQueueChain
{
public:
nsEventQueueImpl();
virtual ~nsEventQueueImpl();
// nsISupports interface...
NS_DECL_ISUPPORTS
// nsIEventQueue interface...
NS_DECL_NSIEVENTQUEUE
// Helpers
static NS_METHOD Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
static const nsCID& CID() { static nsCID cid = NS_EVENTQUEUE_CID; return cid; }
// nsPIEventQueueChain interface
NS_IMETHOD AppendQueue(nsIEventQueue *aQueue);
NS_IMETHOD Unlink();
NS_IMETHOD GetYoungest(nsIEventQueue **aQueue);
NS_IMETHOD GetYoungestActive(nsIEventQueue **aQueue);
NS_IMETHOD SetYounger(nsPIEventQueueChain *aQueue);
NS_IMETHOD GetYounger(nsIEventQueue **aQueue);
NS_IMETHOD SetElder(nsPIEventQueueChain *aQueue);
NS_IMETHOD GetElder(nsIEventQueue **aQueue);
private:
PLEventQueue *mEventQueue;
PRBool mAcceptingEvents, // accept new events or pass them on?
mCouldHaveEvents; // accepting new ones, or still have old ones?
nsCOMPtr<nsPIEventQueueChain> mElderQueue; // younger can hold on to elder
nsPIEventQueueChain *mYoungerQueue; // but elder can't hold on to younger
void NotifyObservers(const char *aTopic);
void CheckForDeactivation() {
if (mCouldHaveEvents && !mAcceptingEvents && !PL_EventAvailable(mEventQueue)) {
mCouldHaveEvents = PR_FALSE;
NS_RELEASE_THIS(); // balance ADDREF from the constructor
}
}
};