зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
2.3 KiB
C++
82 строки
2.3 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 _nsAccCache_H_
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#define _nsAccCache_H_
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#include "nsIAccessible.h"
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#include "nsRefPtrHashtable.h"
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#include "nsCycleCollectionParticipant.h"
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////////////////////////////////////////////////////////////////////////////////
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// Accessible cache utils
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////////////////////////////////////////////////////////////////////////////////
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/**
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* Shutdown and removes the accessible from cache.
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*/
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template <class T>
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static PLDHashOperator
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ClearCacheEntry(const void* aKey, nsRefPtr<T>& aAccessible, void* aUserArg)
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{
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NS_ASSERTION(aAccessible, "Calling ClearCacheEntry with a nullptr pointer!");
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if (aAccessible)
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aAccessible->Shutdown();
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return PL_DHASH_REMOVE;
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}
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/**
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* Clear the cache and shutdown the accessibles.
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*/
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static void
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ClearCache(mozilla::a11y::AccessibleHashtable& aCache)
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{
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aCache.Enumerate(ClearCacheEntry<mozilla::a11y::Accessible>, nullptr);
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}
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/**
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* Traverse the accessible cache entry for cycle collector.
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*/
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template <class T>
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static PLDHashOperator
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CycleCollectorTraverseCacheEntry(const void *aKey, T *aAccessible,
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void *aUserArg)
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{
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nsCycleCollectionTraversalCallback *cb =
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static_cast<nsCycleCollectionTraversalCallback*>(aUserArg);
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*cb, "accessible cache entry");
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nsISupports *supports = static_cast<nsIAccessible*>(aAccessible);
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cb->NoteXPCOMChild(supports);
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return PL_DHASH_NEXT;
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}
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/**
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* Unlink the accessible cache for the cycle collector.
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*/
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inline void
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ImplCycleCollectionUnlink(mozilla::a11y::AccessibleHashtable& aCache)
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{
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ClearCache(aCache);
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}
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/**
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* Traverse the accessible cache for cycle collector.
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*/
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inline void
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ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
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mozilla::a11y::AccessibleHashtable& aCache,
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const char* aName,
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uint32_t aFlags = 0)
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{
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aCache.EnumerateRead(CycleCollectorTraverseCacheEntry<mozilla::a11y::Accessible>,
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&aCallback);
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}
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#endif
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