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| 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 #include "device_sensor_event_pump.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "content/public/renderer/render_thread.h" | |
| 9 | |
| 10 namespace content { | |
| 11 | |
| 12 // Default interval between successive polls, should take into account the | |
| 13 // value of |kInertialSensorIntervalMillis| in | |
| 14 // content/browser/device_sensors/inertial_sensor_consts.h. | |
| 15 const int DeviceSensorEventPump::kDefaultPumpDelayMillis = 50; | |
| 16 | |
| 17 int DeviceSensorEventPump::GetDelayMillis() const { | |
| 18 return pump_delay_millis_; | |
| 19 } | |
| 20 | |
| 21 DeviceSensorEventPump::DeviceSensorEventPump() | |
| 22 : pump_delay_millis_(kDefaultPumpDelayMillis), | |
| 23 state_(STOPPED) { | |
| 24 } | |
| 25 | |
| 26 DeviceSensorEventPump::DeviceSensorEventPump(int pump_delay_millis) | |
| 27 : pump_delay_millis_(pump_delay_millis), | |
| 28 state_(STOPPED) { | |
| 29 DCHECK_GE(pump_delay_millis_, 0); | |
| 30 } | |
| 31 | |
| 32 DeviceSensorEventPump::~DeviceSensorEventPump() { | |
| 33 } | |
| 34 | |
| 35 bool DeviceSensorEventPump::RequestStart() { | |
| 36 DVLOG(2) << "requested start"; | |
| 37 | |
| 38 if (state_ != STOPPED) | |
| 39 return false; | |
| 40 | |
| 41 DCHECK(!timer_.IsRunning()); | |
| 42 | |
| 43 if (SendStartMessage()) { | |
| 44 state_ = PENDING_START; | |
| 45 return true; | |
| 46 } | |
| 47 return false; | |
| 48 } | |
| 49 | |
| 50 bool DeviceSensorEventPump::Stop() { | |
| 51 DVLOG(2) << "stop"; | |
| 52 | |
| 53 if (state_ == STOPPED) | |
| 54 return true; | |
| 55 | |
| 56 DCHECK((state_ == PENDING_START && !timer_.IsRunning()) || | |
| 57 (state_ == RUNNING && timer_.IsRunning())); | |
| 58 | |
| 59 if (timer_.IsRunning()) | |
| 60 timer_.Stop(); | |
| 61 SendStopMessage(); | |
| 62 state_ = STOPPED; | |
| 63 return true; | |
| 64 } | |
| 65 | |
| 66 void DeviceSensorEventPump::Attach(RenderThread* thread) { | |
| 67 if (!thread) | |
| 68 return; | |
| 69 thread->AddObserver(this); | |
| 70 } | |
| 71 | |
| 72 void DeviceSensorEventPump::OnDidStart(base::SharedMemoryHandle handle) { | |
| 73 DVLOG(2) << "did start sensor event pump"; | |
| 74 | |
| 75 if (state_ != PENDING_START) | |
| 76 return; | |
| 77 | |
| 78 DCHECK(!timer_.IsRunning()); | |
| 79 | |
| 80 if (InitializeReader(handle)) { | |
| 81 timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(GetDelayMillis()), | |
| 82 this, &DeviceSensorEventPump::FireEvent); | |
| 83 state_ = RUNNING; | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 } // namespace content | |
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Chromium Code Reviews
Issue 446603002:
Refactor code listening to platform events in content/renderer/. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@webkitplatform_impl_start_stop