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// Copyright (c) 2012 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_SENSORS_PROVIDER_H_
#define CONTENT_PUBLIC_BROWSER_SENSORS_PROVIDER_H_
#pragma once
#include "content/common/content_export.h"
#include "content/public/browser/sensors.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 content {
class SensorsListener;
// TODO(cwolfe): Finish defining the initial set of channels and replace this
// with the generic sensor provider.
class SensorsProvider {
public:
CONTENT_EXPORT static SensorsProvider* 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(SensorsListener* 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(SensorsListener* listener) = 0;
// Broadcasts a change to the coarse screen orientation.
//
// This method may be called in any thread.
virtual void ScreenOrientationChanged(ScreenOrientation change) = 0;
protected:
virtual ~SensorsProvider() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_SENSORS_PROVIDER_H_
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