1 files changed, 47 insertions, 0 deletions
diff --git a/layout/base/ZoomConstraintsClient.h b/layout/base/ZoomConstraintsClient.h
new file mode 100644
index 000000000..128ed73ea
--- /dev/null
+++ b/layout/base/ZoomConstraintsClient.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "FrameMetrics.h"
+#include "mozilla/Maybe.h"
+#include "nsIDOMEventListener.h"
+#include "nsIObserver.h"
+#include "nsWeakPtr.h"
+
+class nsIDOMEventTarget;
+class nsIDocument;
+class nsIPresShell;
+
+class ZoomConstraintsClient final : public nsIDOMEventListener,
+                                    public nsIObserver
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIDOMEVENTLISTENER
+  NS_DECL_NSIOBSERVER
+
+  ZoomConstraintsClient();
+
+private:
+  ~ZoomConstraintsClient();
+
+public:
+  void Init(nsIPresShell* aPresShell, nsIDocument *aDocument);
+  void Destroy();
+  void ScreenSizeChanged();
+
+private:
+  void RefreshZoomConstraints();
+
+  nsCOMPtr<nsIDocument> mDocument;
+  nsIPresShell* MOZ_NON_OWNING_REF mPresShell; // raw ref since the presShell owns this
+  nsCOMPtr<nsIDOMEventTarget> mEventTarget;
+  mozilla::Maybe<mozilla::layers::ScrollableLayerGuid> mGuid;
+};
+
+#endif
+