forked from mirrors/gecko-dev
d94419173b
Differential Revision: https://phabricator.services.mozilla.com/D63102 --HG-- extra : moz-landing-system : lando
83 lines
2.4 KiB
C++
83 lines
2.4 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 nsChildContentList_h__
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#define nsChildContentList_h__
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#include "mozilla/RefPtr.h"
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#include "nsISupportsImpl.h"
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#include "nsINodeList.h" // base class
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#include "js/TypeDecls.h" // for Handle, Value, JSObject, JSContext
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class nsIContent;
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class nsINode;
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/**
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* Class that implements the nsINodeList interface (a list of children of
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* the content), by holding a reference to the content and delegating Length
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* and Item to its existing child list.
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* @see nsINodeList
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*/
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class nsAttrChildContentList : public nsINodeList {
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public:
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explicit nsAttrChildContentList(nsINode* aNode) : mNode(aNode) {}
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(nsAttrChildContentList)
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// nsWrapperCache
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virtual JSObject* WrapObject(JSContext* cx,
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JS::Handle<JSObject*> aGivenProto) override;
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// nsINodeList interface
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virtual int32_t IndexOf(nsIContent* aContent) override;
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virtual nsIContent* Item(uint32_t aIndex) override;
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uint32_t Length() override;
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nsINode* GetParentObject() final { return mNode; }
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virtual void InvalidateCacheIfAvailable() {}
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protected:
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virtual ~nsAttrChildContentList() = default;
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private:
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// The node whose children make up the list.
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RefPtr<nsINode> mNode;
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};
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class nsParentNodeChildContentList final : public nsAttrChildContentList {
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public:
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explicit nsParentNodeChildContentList(nsINode* aNode)
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: nsAttrChildContentList(aNode), mIsCacheValid(false) {
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ValidateCache();
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}
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// nsINodeList interface
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virtual int32_t IndexOf(nsIContent* aContent) override;
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virtual nsIContent* Item(uint32_t aIndex) override;
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uint32_t Length() override;
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void InvalidateCacheIfAvailable() final { InvalidateCache(); }
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void InvalidateCache() {
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mIsCacheValid = false;
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mCachedChildArray.Clear();
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}
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private:
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~nsParentNodeChildContentList() = default;
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// Return true if validation succeeds, false otherwise
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bool ValidateCache();
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// Whether cached array of child nodes is valid
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bool mIsCacheValid;
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// Cached array of child nodes
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AutoTArray<nsIContent*, 8> mCachedChildArray;
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};
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#endif /* nsChildContentList_h__ */
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