diff options
Diffstat (limited to 'chromium/content/renderer/device_sensors/device_orientation_event_pump.h')
-rw-r--r-- | chromium/content/renderer/device_sensors/device_orientation_event_pump.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/chromium/content/renderer/device_sensors/device_orientation_event_pump.h b/chromium/content/renderer/device_sensors/device_orientation_event_pump.h new file mode 100644 index 00000000000..b35ac3314da --- /dev/null +++ b/chromium/content/renderer/device_sensors/device_orientation_event_pump.h @@ -0,0 +1,54 @@ +// Copyright 2014 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_SENSORS_DEVICE_ORIENTATION_EVENT_PUMP_H_ +#define CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_ORIENTATION_EVENT_PUMP_H_ + +#include "base/memory/scoped_ptr.h" +#include "content/renderer/device_sensors/device_sensor_event_pump.h" +#include "content/renderer/shared_memory_seqlock_reader.h" +#include "third_party/WebKit/public/platform/WebDeviceOrientationData.h" + +namespace blink { +class WebDeviceOrientationListener; +} + +namespace content { + +typedef SharedMemorySeqLockReader<blink::WebDeviceOrientationData> + DeviceOrientationSharedMemoryReader; + +class CONTENT_EXPORT DeviceOrientationEventPump : public DeviceSensorEventPump { + public: + // Angle threshold beyond which two orientation events are considered + // sufficiently different. + static const double kOrientationThreshold; + + DeviceOrientationEventPump(); + explicit DeviceOrientationEventPump(int pump_delay_millis); + virtual ~DeviceOrientationEventPump(); + + // Sets the listener to receive updates for device orientation data at + // regular intervals. Returns true if the registration was successful. + bool SetListener(blink::WebDeviceOrientationListener* listener); + + // RenderProcessObserver implementation. + virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE; + + protected: + virtual void FireEvent() OVERRIDE; + virtual bool InitializeReader(base::SharedMemoryHandle handle) OVERRIDE; + virtual bool SendStartMessage() OVERRIDE; + virtual bool SendStopMessage() OVERRIDE; + + bool ShouldFireEvent(const blink::WebDeviceOrientationData& data) const; + + blink::WebDeviceOrientationListener* listener_; + blink::WebDeviceOrientationData data_; + scoped_ptr<DeviceOrientationSharedMemoryReader> reader_; +}; + +} // namespace content + +#endif // CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_ORIENTATION_EVENT_PUMP_H_ |