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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_ |
| 6 #define CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_ |
| 7 |
| 8 #include "base/memory/scoped_ptr.h" |
| 9 #include "base/shared_memory.h" |
| 10 #include "base/timer/timer.h" |
| 11 #include "content/public/renderer/render_process_observer.h" |
| 12 #include "content/renderer/shared_memory_seqlock_reader.h" |
| 13 #include "third_party/WebKit/public/platform/WebDeviceMotionData.h" |
| 14 |
| 15 namespace WebKit { |
| 16 class WebDeviceMotionListener; |
| 17 } |
| 18 |
| 19 namespace content { |
| 20 class RenderThread; |
| 21 |
| 22 typedef SharedMemorySeqLockReader<WebKit::WebDeviceMotionData> |
| 23 DeviceMotionSharedMemoryReader; |
| 24 |
| 25 class CONTENT_EXPORT DeviceMotionEventPump : public RenderProcessObserver { |
| 26 public: |
| 27 DeviceMotionEventPump(); |
| 28 virtual ~DeviceMotionEventPump(); |
| 29 |
| 30 static double GetDelayMillis(); |
| 31 |
| 32 // Sets the listener to receive updates for device motion data at |
| 33 // regular intervals. |
| 34 // Returns true if the registration was successful. |
| 35 bool SetListener(WebKit::WebDeviceMotionListener*); |
| 36 |
| 37 void SetDeviceMotionReader(scoped_ptr<DeviceMotionSharedMemoryReader>); |
| 38 |
| 39 void Attach(RenderThread* thread); |
| 40 |
| 41 // RenderProcessObserver implementation. |
| 42 virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE; |
| 43 |
| 44 protected: |
| 45 // Delay between subsequent firing of events. |
| 46 static const double kPumpDelayMillis; |
| 47 |
| 48 // The pump is a tri-state automaton with allowed transitions as follows: |
| 49 // STOPPED -> PENDING_START |
| 50 // PENDING_START -> RUNNING |
| 51 // PENDING_START -> STOPPED |
| 52 // RUNNING -> STOPPED |
| 53 enum PumpState { |
| 54 STOPPED, |
| 55 RUNNING, |
| 56 PENDING_START |
| 57 }; |
| 58 |
| 59 bool StartFetchingDeviceMotion(); |
| 60 bool StopFetchingDeviceMotion(); |
| 61 void OnDidStartDeviceMotion(base::SharedMemoryHandle renderer_handle); |
| 62 void FireEvent(); |
| 63 |
| 64 WebKit::WebDeviceMotionListener* listener_; |
| 65 scoped_ptr<DeviceMotionSharedMemoryReader> reader_; |
| 66 base::RepeatingTimer<DeviceMotionEventPump> timer_; |
| 67 PumpState state_; |
| 68 }; |
| 69 |
| 70 } // namespace content |
| 71 |
| 72 #endif // CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_ |
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