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114 lines
3.7 KiB
C++
114 lines
3.7 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: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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.org 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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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsObserverList_h___
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#define nsObserverList_h___
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#include "nsISupports.h"
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#include "nsTArray.h"
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#include "nsCOMPtr.h"
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#include "nsCOMArray.h"
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#include "nsIObserver.h"
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#include "nsIWeakReference.h"
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#include "nsHashKeys.h"
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#include "nsISimpleEnumerator.h"
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struct ObserverRef
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{
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ObserverRef(const ObserverRef& o) :
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isWeakRef(o.isWeakRef), ref(o.ref) { }
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ObserverRef(nsIObserver* aObserver) : isWeakRef(false), ref(aObserver) { }
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ObserverRef(nsIWeakReference* aWeak) : isWeakRef(true), ref(aWeak) { }
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bool isWeakRef;
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nsCOMPtr<nsISupports> ref;
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nsIObserver* asObserver() {
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NS_ASSERTION(!isWeakRef, "Isn't a strong ref.");
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return static_cast<nsIObserver*>((nsISupports*) ref);
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}
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nsIWeakReference* asWeak() {
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NS_ASSERTION(isWeakRef, "Isn't a weak ref.");
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return static_cast<nsIWeakReference*>((nsISupports*) ref);
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}
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bool operator==(nsISupports* b) const { return ref == b; }
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};
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class nsObserverList : public nsCharPtrHashKey
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{
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public:
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nsObserverList(const char *key) : nsCharPtrHashKey(key)
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{ MOZ_COUNT_CTOR(nsObserverList); }
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~nsObserverList() { MOZ_COUNT_DTOR(nsObserverList); }
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nsresult AddObserver(nsIObserver* anObserver, bool ownsWeak);
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nsresult RemoveObserver(nsIObserver* anObserver);
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void NotifyObservers(nsISupports *aSubject,
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const char *aTopic,
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const PRUnichar *someData);
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nsresult GetObserverList(nsISimpleEnumerator** anEnumerator);
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// Fill an array with the observers of this category.
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// The array is filled in last-added-first order.
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void FillObserverArray(nsCOMArray<nsIObserver> &aArray);
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private:
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nsTArray<ObserverRef> mObservers;
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};
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class nsObserverEnumerator : public nsISimpleEnumerator
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSISIMPLEENUMERATOR
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nsObserverEnumerator(nsObserverList* aObserverList);
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private:
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~nsObserverEnumerator() { }
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PRInt32 mIndex; // Counts up from 0
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nsCOMArray<nsIObserver> mObservers;
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};
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#endif /* nsObserverList_h___ */
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