Absolute Device Orientation API: blink implementation.

third_party/WebKit/Source/modules/device_orientation/DeviceOrientationAbsoluteDispatcher.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DeviceOrientationAbsoluteDispatcher_h
+#define DeviceOrientationAbsoluteDispatcher_h
+
+#include "core/frame/PlatformEventDispatcher.h"
+#include "platform/heap/Handle.h"
+#include "public/platform/modules/device_orientation/WebDeviceOrientationListener.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class DeviceOrientationData;
+class WebDeviceOrientationData;
+
+// This class listens to device orientation data and notifies all registered controllers.
+class DeviceOrientationAbsoluteDispatcher final : public GarbageCollectedFinalized<DeviceOrientationAbsoluteDispatcher>, public PlatformEventDispatcher, public WebDeviceOrientationListener {
+    USING_GARBAGE_COLLECTED_MIXIN(DeviceOrientationAbsoluteDispatcher);
+public:
+    static DeviceOrientationAbsoluteDispatcher& instance();
+    ~DeviceOrientationAbsoluteDispatcher() override;
+
+    // Note that the returned object is owned by this class.
+    // FIXME: make the return value const, see crbug.com/233174.
+    DeviceOrientationData* latestDeviceOrientationData();
+
+    // Inherited from WebDeviceOrientationListener.
+    void didChangeDeviceOrientation(const WebDeviceOrientationData&) override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    DeviceOrientationAbsoluteDispatcher();
+
+    // Inherited from PlatformEventDispatcher.
+    void startListening() override;
+    void stopListening() override;
+
+    Member<DeviceOrientationData> m_lastDeviceOrientationData;
+};
+
+} // namespace blink
+
+#endif // DeviceOrientationAbsoluteDispatcher_h