forked from mirrors/gecko-dev
67 lines
2 KiB
C++
67 lines
2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsCOMArray.h"
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#include "nsIObserver.h"
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#include "nsHashKeys.h"
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#include "nsMaybeWeakPtr.h"
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#include "nsSimpleEnumerator.h"
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#include "mozilla/Attributes.h"
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class nsObserverList : public nsCharPtrHashKey {
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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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MOZ_COUNT_CTOR(nsObserverList);
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}
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nsObserverList(nsObserverList&& aOther)
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: nsCharPtrHashKey(std::move(aOther)),
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mObservers(std::move(aOther.mObservers)) {
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MOZ_COUNT_CTOR(nsObserverList);
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}
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MOZ_COUNTED_DTOR(nsObserverList)
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[[nodiscard]] nsresult AddObserver(nsIObserver* aObserver, bool aOwnsWeak);
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[[nodiscard]] nsresult RemoveObserver(nsIObserver* aObserver);
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void NotifyObservers(nsISupports* aSubject, const char* aTopic,
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const char16_t* aSomeData);
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void GetObserverList(nsISimpleEnumerator** aEnumerator);
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// Clone 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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nsCOMArray<nsIObserver> ReverseCloneObserverArray();
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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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nsMaybeWeakPtrArray<nsIObserver> mObservers;
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};
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class nsObserverEnumerator final : public nsSimpleEnumerator {
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public:
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NS_DECL_NSISIMPLEENUMERATOR
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explicit nsObserverEnumerator(nsObserverList* aObserverList);
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const nsID& DefaultInterface() override { return NS_GET_IID(nsIObserver); }
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private:
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~nsObserverEnumerator() override = default;
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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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