1 files changed, 68 insertions, 0 deletions
diff --git a/dom/base/StyleSheetList.h b/dom/base/StyleSheetList.h
new file mode 100644
index 0000000000..0db025da31
--- /dev/null
+++ b/dom/base/StyleSheetList.h
@@ -0,0 +1,68 @@
+/* -*- 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 mozilla_dom_StyleSheetList_h
+#define mozilla_dom_StyleSheetList_h
+
+#include "nsContentUtils.h"
+#include "mozilla/dom/DocumentOrShadowRoot.h"
+#include "nsStubMutationObserver.h"
+#include "nsWrapperCache.h"
+
+class nsINode;
+
+namespace mozilla {
+class StyleSheet;
+
+namespace dom {
+
+class StyleSheetList final : public nsStubMutationObserver,
+                             public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(StyleSheetList)
+
+  NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
+
+  explicit StyleSheetList(DocumentOrShadowRoot& aScope);
+
+  JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
+
+  nsINode* GetParentObject() const {
+    return mDocumentOrShadowRoot ? &mDocumentOrShadowRoot->AsNode() : nullptr;
+  }
+
+  uint32_t Length() const {
+    return mDocumentOrShadowRoot ? mDocumentOrShadowRoot->SheetCount() : 0;
+  }
+
+  StyleSheet* IndexedGetter(uint32_t aIndex, bool& aFound) const {
+    if (!mDocumentOrShadowRoot) {
+      aFound = false;
+      return nullptr;
+    }
+
+    StyleSheet* sheet = mDocumentOrShadowRoot->SheetAt(aIndex);
+    aFound = !!sheet;
+    return sheet;
+  }
+
+  StyleSheet* Item(uint32_t aIndex) const {
+    bool dummy = false;
+    return IndexedGetter(aIndex, dummy);
+  }
+
+ protected:
+  virtual ~StyleSheetList();
+
+  DocumentOrShadowRoot*
+      mDocumentOrShadowRoot;  // Weak, cleared on "NodeWillBeDestroyed".
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_StyleSheetList_h