зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
2.6 KiB
C++
93 строки
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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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namespace mozilla {
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class ObserverServiceReporter;
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} // namespace mozilla
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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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friend class mozilla::ObserverServiceReporter;
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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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// Unmark any strongly held observers implemented in JS so the cycle
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// collector will not traverse them.
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void UnmarkGrayStrongObservers();
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private:
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nsTArray<ObserverRef> mObservers;
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};
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class nsObserverEnumerator MOZ_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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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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