diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /dom/base/nsChildContentList.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/base/nsChildContentList.h')
-rw-r--r-- | dom/base/nsChildContentList.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/dom/base/nsChildContentList.h b/dom/base/nsChildContentList.h new file mode 100644 index 0000000000..af43253cbf --- /dev/null +++ b/dom/base/nsChildContentList.h @@ -0,0 +1,83 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef nsChildContentList_h__ +#define nsChildContentList_h__ + +#include "mozilla/RefPtr.h" +#include "nsISupportsImpl.h" +#include "nsINodeList.h" // base class +#include "js/TypeDecls.h" // for Handle, Value, JSObject, JSContext + +class nsIContent; +class nsINode; + +/** + * Class that implements the nsINodeList interface (a list of children of + * the content), by holding a reference to the content and delegating Length + * and Item to its existing child list. + * @see nsINodeList + */ +class nsAttrChildContentList : public nsINodeList { + public: + explicit nsAttrChildContentList(nsINode* aNode) : mNode(aNode) {} + + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_SKIPPABLE_WRAPPERCACHE_CLASS(nsAttrChildContentList) + + // nsWrapperCache + virtual JSObject* WrapObject(JSContext* cx, + JS::Handle<JSObject*> aGivenProto) override; + + // nsINodeList interface + virtual int32_t IndexOf(nsIContent* aContent) override; + virtual nsIContent* Item(uint32_t aIndex) override; + uint32_t Length() override; + nsINode* GetParentObject() final { return mNode; } + + virtual void InvalidateCacheIfAvailable() {} + + protected: + virtual ~nsAttrChildContentList() = default; + + private: + // The node whose children make up the list. + RefPtr<nsINode> mNode; +}; + +class nsParentNodeChildContentList final : public nsAttrChildContentList { + public: + explicit nsParentNodeChildContentList(nsINode* aNode) + : nsAttrChildContentList(aNode), mIsCacheValid(false) { + ValidateCache(); + } + + // nsINodeList interface + virtual int32_t IndexOf(nsIContent* aContent) override; + virtual nsIContent* Item(uint32_t aIndex) override; + uint32_t Length() override; + + void InvalidateCacheIfAvailable() final { InvalidateCache(); } + + void InvalidateCache() { + mIsCacheValid = false; + mCachedChildArray.Clear(); + } + + private: + ~nsParentNodeChildContentList() = default; + + // Return true if validation succeeds, false otherwise + bool ValidateCache(); + + // Whether cached array of child nodes is valid + bool mIsCacheValid; + + // Cached array of child nodes + AutoTArray<nsIContent*, 8> mCachedChildArray; +}; + +#endif /* nsChildContentList_h__ */ |