1 files changed, 69 insertions, 0 deletions
diff --git a/toolkit/components/sessionstore/SessionStoreScrollData.h b/toolkit/components/sessionstore/SessionStoreScrollData.h
new file mode 100644
index 0000000000..b2f5d4bd32
--- /dev/null
+++ b/toolkit/components/sessionstore/SessionStoreScrollData.h
@@ -0,0 +1,69 @@
+/* -*- 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_SessionStoreScrollData_h
+#define mozilla_dom_SessionStoreScrollData_h
+
+#include "js/TypeDecls.h"
+#include "mozilla/WeakPtr.h"
+#include "nsPoint.h"
+#include "nsTArray.h"
+#include "nsWrapperCache.h"
+#include "mozilla/dom/WindowGlobalParent.h"
+#include "mozilla/dom/SessionStoreChangeListener.h"
+
+namespace mozilla::dom {
+
+class BrowsingContext;
+class WindowGlobalParent;
+class OwningByteStringOrObjectOrNull;
+struct SessionStoreZoomData;
+
+using SessionStoreZoom = std::tuple<float, uint32_t, uint32_t>;
+using MaybeSessionStoreZoom =
+    mozilla::Maybe<std::tuple<float, uint32_t, uint32_t>>;
+
+class SessionStoreScrollData final : public nsISupports,
+                                     public nsWrapperCache,
+                                     public SupportsWeakPtr {
+ public:
+  using CollectedType = nsPoint;
+  using LocationType = WeakPtr<SessionStoreScrollData>;
+  using ChildrenArray = nsTArray<RefPtr<SessionStoreScrollData>>;
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(SessionStoreScrollData)
+  nsISupports* GetParentObject() const;
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  void GetScroll(nsACString& aScroll) const;
+
+  ChildrenArray& Children();
+
+  void GetChildren(Nullable<ChildrenArray>& aChildren) const;
+
+  void ToJSON(JSContext* aCx, JS::MutableHandle<JSObject*> aRetval);
+
+  void Update(const CollectedType& aUpdate);
+
+  void ClearCachedChildren();
+
+  static bool HasData(const CollectedType& aPoint);
+
+  bool IsEmpty() const;
+
+ private:
+  ~SessionStoreScrollData() = default;
+
+  nsPoint mScroll;
+  MaybeSessionStoreZoom mZoom;
+  nsTArray<RefPtr<SessionStoreScrollData>> mChildren;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_SessionStoreScrollData_h