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-rw-r--r--dom/base/nsChildContentList.h63
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diff --git a/dom/base/nsChildContentList.h b/dom/base/nsChildContentList.h
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+/* -*- 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 "nsISupportsImpl.h"
+#include "nsINodeList.h" // base class
+#include "js/TypeDecls.h" // for Handle, Value, JSObject, JSContext
+
+class nsIContent;
+class nsINode;
+
+/**
+ * Class that implements the nsIDOMNodeList interface (a list of children of
+ * the content), by holding a reference to the content and delegating GetLength
+ * and Item to its existing child list.
+ * @see nsIDOMNodeList
+ */
+class nsChildContentList final : public nsINodeList
+{
+public:
+ explicit nsChildContentList(nsINode* aNode)
+ : mNode(aNode)
+ {
+ }
+
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(nsChildContentList)
+
+ // nsWrapperCache
+ virtual JSObject* WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override;
+
+ // nsIDOMNodeList interface
+ NS_DECL_NSIDOMNODELIST
+
+ // nsINodeList interface
+ virtual int32_t IndexOf(nsIContent* aContent) override;
+ virtual nsIContent* Item(uint32_t aIndex) override;
+
+ void DropReference()
+ {
+ mNode = nullptr;
+ }
+
+ virtual nsINode* GetParentObject() override
+ {
+ return mNode;
+ }
+
+private:
+ ~nsChildContentList() {}
+
+ // The node whose children make up the list.
+ // This is a non-owning ref which is safe because it's set to nullptr by
+ // DropReference() by the node slots get destroyed.
+ nsINode* MOZ_NON_OWNING_REF mNode;
+};
+
+#endif /* nsChildContentList_h__ */