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Unified Diff: content/browser/sensors/sensors_provider.h

Issue 7366011: Initial sensor event provider for testing views screen rotation (Closed) Base URL: http://git.chromium.org/git/chromium.git@trunk
Patch Set: Restore more specific version of another missing header. Created 9 years, 5 months ago
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Index: content/browser/sensors/sensors_provider.h
diff --git a/content/browser/sensors/sensors_provider.h b/content/browser/sensors/sensors_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..72bc15fd24fb441396ea9913a37250e04419734e
--- /dev/null
+++ b/content/browser/sensors/sensors_provider.h
@@ -0,0 +1,57 @@
+// 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_
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