Index: content/renderer/device_orientation/device_motion_event_pump.h |
diff --git a/content/renderer/device_orientation/device_motion_event_pump.h b/content/renderer/device_orientation/device_motion_event_pump.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..e16e6b2d5153837ebe8f6c4b42b9cc3c410e2a52 |
--- /dev/null |
+++ b/content/renderer/device_orientation/device_motion_event_pump.h |
@@ -0,0 +1,72 @@ |
+// Copyright (c) 2013 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_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_ |
+#define CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_ |
+ |
+#include "base/memory/scoped_ptr.h" |
+#include "base/shared_memory.h" |
+#include "base/timer/timer.h" |
+#include "content/public/renderer/render_process_observer.h" |
+#include "content/renderer/shared_memory_seqlock_reader.h" |
+#include "third_party/WebKit/public/platform/WebDeviceMotionData.h" |
+ |
+namespace WebKit { |
+class WebDeviceMotionListener; |
+} |
+ |
+namespace content { |
+class RenderThread; |
+ |
+typedef SharedMemorySeqLockReader<WebKit::WebDeviceMotionData> |
+ DeviceMotionSharedMemoryReader; |
+ |
+class CONTENT_EXPORT DeviceMotionEventPump : public RenderProcessObserver { |
+ public: |
+ DeviceMotionEventPump(); |
+ virtual ~DeviceMotionEventPump(); |
+ |
+ static double GetDelayMillis(); |
+ |
+ // Sets the listener to receive updates for device motion data at |
+ // regular intervals. |
+ // Returns true if the registration was successful. |
+ bool SetListener(WebKit::WebDeviceMotionListener*); |
+ |
+ void SetDeviceMotionReader(scoped_ptr<DeviceMotionSharedMemoryReader>); |
+ |
+ void Attach(RenderThread* thread); |
+ |
+ // RenderProcessObserver implementation. |
+ virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE; |
+ |
+ protected: |
+ // Delay between subsequent firing of events. |
+ static const double kPumpDelayMillis; |
+ |
+ // The pump is a tri-state automaton with allowed transitions as follows: |
+ // STOPPED -> PENDING_START |
+ // PENDING_START -> RUNNING |
+ // PENDING_START -> STOPPED |
+ // RUNNING -> STOPPED |
+ enum PumpState { |
+ STOPPED, |
+ RUNNING, |
+ PENDING_START |
+ }; |
+ |
+ bool StartFetchingDeviceMotion(); |
+ bool StopFetchingDeviceMotion(); |
+ void OnDidStartDeviceMotion(base::SharedMemoryHandle renderer_handle); |
+ void FireEvent(); |
+ |
+ WebKit::WebDeviceMotionListener* listener_; |
+ scoped_ptr<DeviceMotionSharedMemoryReader> reader_; |
+ base::RepeatingTimer<DeviceMotionEventPump> timer_; |
+ PumpState state_; |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_ |