Index: content/browser/sensors/sensors_provider.h |
diff --git a/content/browser/sensors/sensors_provider.h b/content/browser/sensors/sensors_provider.h |
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+++ b/content/browser/sensors/sensors_provider.h |
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+// Copyright (c) 2011 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_BROWSER_SENSORS_PROVIDER_H_ |
+#define CONTENT_BROWSER_SENSORS_PROVIDER_H_ |
+#pragma once |
+ |
+#include "base/basictypes.h" |
+#include "content/common/sensors_listener.h" |
+ |
+// The sensors API will unify various types of sensor data into a set of |
+// channels, each of which provides change events and periodic updates. |
+// |
+// This version of the API is intended only to support the experimental screen |
+// rotation code and is not for general use. In particular, the final listener |
+// will declare generic |OnSensorChanged| and |OnSensorUpdated| methods, rather |
+// than the special-purpose |OnScreenOrientationChanged|. |
+ |
+namespace sensors { |
+ |
+// TODO(cwolfe): Finish defining the initial set of channels and replace this |
+// with the generic sensor provider. |
+// |
+class Provider { |
+ public: |
+ static Provider* GetInstance(); |
+ |
+ // Adds a sensor listener. The listener will receive callbacks to indicate |
+ // sensor changes and updates until it is removed. |
+ // |
+ // This method may be called in any thread. Callbacks on a listener will |
+ // always be executed in the thread which added that listener. |
+ virtual void AddListener(Listener* listener) = 0; |
+ |
+ // Removes a sensor listener. |
+ // |
+ // This method must be called in the same thread which added the listener. |
+ // If the listener is not currently subscribed, this method may be called in |
+ // any thread. |
+ virtual void RemoveListener(Listener* listener) = 0; |
+ |
+ // Broadcasts a change to the coarse screen orientation. |
+ // |
+ // This method may be called in any thread. |
+ virtual void ScreenOrientationChanged(const ScreenOrientation& change) = 0; |
+ |
+ protected: |
+ Provider(); |
+ virtual ~Provider(); |
+ |
+ DISALLOW_COPY_AND_ASSIGN(Provider); |
+}; |
+ |
+} // namespace sensors |
+ |
+#endif // CONTENT_BROWSER_SENSORS_PROVIDER_H_ |