1 files changed, 35 insertions, 0 deletions
diff --git a/dom/base/WindowOrientationObserver.h b/dom/base/WindowOrientationObserver.h
new file mode 100644
index 000000000..b544f202b
--- /dev/null
+++ b/dom/base/WindowOrientationObserver.h
@@ -0,0 +1,35 @@
+/* -*- 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_WindowOrientationObserver_h
+#define mozilla_dom_WindowOrientationObserver_h
+
+#include "mozilla/HalScreenConfiguration.h"
+
+class nsGlobalWindow;
+
+namespace mozilla {
+namespace dom {
+
+class WindowOrientationObserver final :
+  public mozilla::hal::ScreenConfigurationObserver
+{
+public:
+  explicit WindowOrientationObserver(nsGlobalWindow* aGlobalWindow);
+  ~WindowOrientationObserver();
+  void Notify(const mozilla::hal::ScreenConfiguration& aConfiguration) override;
+  static int16_t OrientationAngle();
+
+private:
+  // Weak pointer, instance is owned by mWindow.
+  nsGlobalWindow* MOZ_NON_OWNING_REF mWindow;
+  uint16_t mAngle;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_WindowOrientationObserver_h