1 files changed, 55 insertions, 0 deletions
diff --git a/layout/base/ZoomConstraintsClient.h b/layout/base/ZoomConstraintsClient.h
new file mode 100644
index 0000000000..3f80ca7558
--- /dev/null
+++ b/layout/base/ZoomConstraintsClient.h
@@ -0,0 +1,55 @@
+/* -*- 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 ZoomConstraintsClient_h_
+#define ZoomConstraintsClient_h_
+
+#include "mozilla/layers/ScrollableLayerGuid.h"
+#include "mozilla/layers/ZoomConstraints.h"
+#include "mozilla/Maybe.h"
+#include "nsCOMPtr.h"
+#include "nsIDOMEventListener.h"
+#include "nsIObserver.h"
+
+namespace mozilla {
+class PresShell;
+namespace dom {
+class Document;
+class EventTarget;
+}  // namespace dom
+}  // namespace mozilla
+
+class ZoomConstraintsClient final : public nsIDOMEventListener,
+                                    public nsIObserver {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIDOMEVENTLISTENER
+  NS_DECL_NSIOBSERVER
+
+  ZoomConstraintsClient();
+
+ private:
+  ~ZoomConstraintsClient();
+
+ public:
+  void Init(mozilla::PresShell* aPresShell, mozilla::dom::Document* aDocument);
+  void Destroy();
+  void ScreenSizeChanged();
+
+  bool GetAllowZoom() const { return mZoomConstraints.mAllowZoom; }
+
+ private:
+  void RefreshZoomConstraints();
+
+  RefPtr<mozilla::dom::Document> mDocument;
+  // raw ref since the presShell owns this
+  mozilla::PresShell* MOZ_NON_OWNING_REF mPresShell;
+  nsCOMPtr<mozilla::dom::EventTarget> mEventTarget;
+  mozilla::Maybe<mozilla::layers::ScrollableLayerGuid> mGuid;
+  mozilla::layers::ZoomConstraints mZoomConstraints;
+};
+
+#endif