DeviceOrientation API on ChromeOS

content/public/browser/sensor_manager_delegate.h

+// Copyright 2014 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 CONTENT_PUBLIC_BROWSER_SENSOR_MANAGER_DELEGATE_H_
+#define CONTENT_PUBLIC_BROWSER_SENSOR_MANAGER_DELEGATE_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "content/common/content_export.h"
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+namespace content {
+
+typedef base::Callback<void(double, double, double)> OrientationDataXYZCallback;

[flackr, 2014/11/13 21:09:22]

nit: double x, double y, double z
Also s/OrientationDataXYZCallback/OrientationDataCallback

[jonross, 2014/11/17 21:54:10]

Done.

+
+// For platforms with a push API for accelerometer sensors this delegate can be
+// implemented. Once notified to start fetching data, the callback provided can
+// be used to send the data.
+class CONTENT_EXPORT SensorManagerDelegate {
+ public:
+  SensorManagerDelegate();
+  virtual ~SensorManagerDelegate();
+
+  // Returns the SensorManagerDelegate singleton
+  static SensorManagerDelegate* GetInstance();
+
+  // True if a SensorManagerDelegate has been set.
+  static bool HasInstance();
+
+  // Allows platforms to provide a delegate.
+  static void SetDelegate(SensorManagerDelegate* delegate);
+
+  // Start processing accelerometer events for orientation. The values can be
+  // passed via |callback|
+  virtual void StartFetchingDeviceOrientationData(
+      const OrientationDataXYZCallback& callback) = 0;
+
+  // Stop processing accelerometer events for orientation.
+  virtual void StopFetchingDeviceOrientationData() = 0;
+
+ private:
+  static SensorManagerDelegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(SensorManagerDelegate);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_SENSOR_MANAGER_DELEGATE_H_