93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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#include "mozilla/Attributes.h"
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struct ObserverRef
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{
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ObserverRef(const ObserverRef& aO) : isWeakRef(aO.isWeakRef), ref(aO.ref) {}
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explicit ObserverRef(nsIObserver* aObserver) : isWeakRef(false), ref(aObserver) {}
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explicit 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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{
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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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{
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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* aRhs) const { return ref == aRhs; }
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};
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class nsObserverList : public nsCharPtrHashKey
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{
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friend class nsObserverService;
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public:
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explicit nsObserverList(const char* aKey) : nsCharPtrHashKey(aKey)
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{
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MOZ_COUNT_CTOR(nsObserverList);
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}
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~nsObserverList()
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{
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MOZ_COUNT_DTOR(nsObserverList);
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}
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MOZ_MUST_USE nsresult AddObserver(nsIObserver* aObserver, bool aOwnsWeak);
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MOZ_MUST_USE nsresult RemoveObserver(nsIObserver* aObserver);
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void NotifyObservers(nsISupports* aSubject,
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const char* aTopic,
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const char16_t* aSomeData);
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void GetObserverList(nsISimpleEnumerator** aEnumerator);
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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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// Like FillObserverArray(), but only for strongly held observers.
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void AppendStrongObservers(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 final : 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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explicit nsObserverEnumerator(nsObserverList* aObserverList);
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private:
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~nsObserverEnumerator() {}
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int32_t 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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