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| 1 // Copyright 2016 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 "modules/sensor/Sensor.h" |
| 6 |
| 7 #include "core/dom/Document.h" |
| 8 #include "core/dom/ExceptionCode.h" |
| 9 #include "core/events/Event.h" |
| 10 |
| 11 #include "modules/sensor/SensorReading.h" |
| 12 |
| 13 namespace blink { |
| 14 |
| 15 Sensor::~Sensor() |
| 16 { |
| 17 } |
| 18 |
| 19 Sensor::Sensor(ExecutionContext* executionContext, const SensorOptions& sensorOp
tions) |
| 20 : ActiveScriptWrappable(this) |
| 21 , ActiveDOMObject(executionContext) |
| 22 , PlatformEventController(toDocument(executionContext)->page()) |
| 23 , m_sensorState(SensorState::Idle) |
| 24 , m_sensorReading(nullptr) |
| 25 , m_sensorOptions(sensorOptions) |
| 26 { |
| 27 } |
| 28 |
| 29 // Getters |
| 30 String Sensor::state() const |
| 31 { |
| 32 switch (m_sensorState) { |
| 33 case SensorState::Idle: |
| 34 return "idle"; |
| 35 case SensorState::Activating: |
| 36 return "activating"; |
| 37 case SensorState::Active: |
| 38 return "active"; |
| 39 case SensorState::Errored: |
| 40 return "errored"; |
| 41 } |
| 42 NOTREACHED(); |
| 43 return "idle"; |
| 44 } |
| 45 |
| 46 SensorReading* Sensor::reading() const |
| 47 { |
| 48 return m_sensorReading.get(); |
| 49 } |
| 50 |
| 51 void Sensor::start(ScriptState* scriptState, ExceptionState& exceptionState) |
| 52 { |
| 53 |
| 54 if (m_sensorState != SensorState::Idle && m_sensorState != SensorState::Erro
red) { |
| 55 exceptionState.throwDOMException(InvalidStateError, "Invalid State: Sens
orState is not idle or errored"); |
| 56 |
| 57 // Avoid re-entrancy. sensor.start() inside 'onstatechange' event handle
r. |
| 58 m_hasEventListener = false; |
| 59 stopUpdating(); |
| 60 |
| 61 return; |
| 62 } |
| 63 |
| 64 updateState(SensorState::Activating); |
| 65 |
| 66 // TODO(riju) : Add Permissions stuff later. |
| 67 |
| 68 m_hasEventListener = true; |
| 69 startUpdating(); |
| 70 updateState(SensorState::Active); |
| 71 |
| 72 } |
| 73 |
| 74 void Sensor::stop(ScriptState* scriptState, ExceptionState& exceptionState) |
| 75 { |
| 76 if (m_sensorState == SensorState::Idle || m_sensorState == SensorState::Erro
red) { |
| 77 exceptionState.throwDOMException(InvalidStateError, "Invalid State: Sens
orState is either idle or errored"); |
| 78 return; |
| 79 } |
| 80 |
| 81 // Avoid re-entrancy. sensor.stop() inside 'onstatechange' event handler. |
| 82 if (m_sensorState == SensorState::Activating) { |
| 83 exceptionState.throwDOMException(InvalidStateError, "Invalid State: Sens
orState Activating"); |
| 84 return; |
| 85 } |
| 86 |
| 87 m_hasEventListener = false; |
| 88 stopUpdating(); |
| 89 |
| 90 m_sensorReading.clear(); |
| 91 updateState(SensorState::Idle); |
| 92 } |
| 93 |
| 94 void Sensor::updateState(SensorState newState) |
| 95 { |
| 96 if (m_sensorState == newState) |
| 97 return; |
| 98 |
| 99 m_sensorState = newState; |
| 100 dispatchEvent(Event::create(EventTypeNames::statechange)); |
| 101 } |
| 102 |
| 103 void Sensor::suspend() |
| 104 { |
| 105 m_hasEventListener = false; |
| 106 stopUpdating(); |
| 107 } |
| 108 |
| 109 void Sensor::resume() |
| 110 { |
| 111 m_hasEventListener = true; |
| 112 startUpdating(); |
| 113 } |
| 114 |
| 115 void Sensor::stop() |
| 116 { |
| 117 m_hasEventListener = false; |
| 118 stopUpdating(); |
| 119 } |
| 120 |
| 121 bool Sensor::hasPendingActivity() const |
| 122 { |
| 123 // Prevent V8 from garbage collecting the wrapper object if there are |
| 124 // event listeners attached to it. |
| 125 return hasEventListeners(); |
| 126 } |
| 127 |
| 128 DEFINE_TRACE(Sensor) |
| 129 { |
| 130 ActiveDOMObject::trace(visitor); |
| 131 EventTargetWithInlineData::trace(visitor); |
| 132 PlatformEventController::trace(visitor); |
| 133 visitor->trace(m_sensorReading); |
| 134 } |
| 135 |
| 136 } // namespace blink |
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