1 // Copyright 2014 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_SENSORS_DEVICE_ORIENTATION_EVENT_PUMP_H_ 6 #define CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_ORIENTATION_EVENT_PUMP_H_ 7 8 #include "base/memory/scoped_ptr.h" 9 #include "content/renderer/device_sensors/device_sensor_event_pump.h" 10 #include "content/renderer/shared_memory_seqlock_reader.h" 11 #include "third_party/WebKit/public/platform/WebDeviceOrientationData.h" 12 13 namespace blink { 14 class WebDeviceOrientationListener; 15 } 16 17 namespace content { 18 19 typedef SharedMemorySeqLockReader<blink::WebDeviceOrientationData> 20 DeviceOrientationSharedMemoryReader; 21 22 class CONTENT_EXPORT DeviceOrientationEventPump : public DeviceSensorEventPump { 23 public: 24 // Angle threshold beyond which two orientation events are considered 25 // sufficiently different. 26 static const double kOrientationThreshold; 27 28 DeviceOrientationEventPump(); 29 explicit DeviceOrientationEventPump(int pump_delay_millis); 30 virtual ~DeviceOrientationEventPump(); 31 32 // Sets the listener to receive updates for device orientation data at 33 // regular intervals. Returns true if the registration was successful. 34 bool SetListener(blink::WebDeviceOrientationListener* listener); 35 36 // RenderProcessObserver implementation. 37 virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE; 38 39 protected: 40 virtual void FireEvent() OVERRIDE; 41 virtual bool InitializeReader(base::SharedMemoryHandle handle) OVERRIDE; 42 virtual bool SendStartMessage() OVERRIDE; 43 virtual bool SendStopMessage() OVERRIDE; 44 45 bool ShouldFireEvent(const blink::WebDeviceOrientationData& data) const; 46 47 blink::WebDeviceOrientationListener* listener_; 48 blink::WebDeviceOrientationData data_; 49 scoped_ptr<DeviceOrientationSharedMemoryReader> reader_; 50 }; 51 52 } // namespace content 53 54 #endif // CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_ORIENTATION_EVENT_PUMP_H_ 55