src/third_party/WebKit/Source/modules/device_light/DeviceLightController.cpp

   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 "config.h"
   6 #include "modules/device_light/DeviceLightController.h"
   7
   8 #include "core/dom/Document.h"
   9 #include "modules/EventModules.h"
  10 #include "modules/device_light/DeviceLightDispatcher.h"
  11 #include "modules/device_light/DeviceLightEvent.h"
  12 #include "platform/RuntimeEnabledFeatures.h"
  13
  14 namespace blink {
  15
  16 DeviceLightController::DeviceLightController(Document& document)
  17     : DeviceSingleWindowEventController(document)
  18 {
  19 }
  20
  21 DeviceLightController::~DeviceLightController()
  22 {
  23     stopUpdating();
  24 }
  25
  26 const char* DeviceLightController::supplementName()
  27 {
  28     return "DeviceLightController";
  29 }
  30
  31 DeviceLightController& DeviceLightController::from(Document& document)
  32 {
  33     DeviceLightController* controller = static_cast<DeviceLightController*>(DocumentSupplement::from(document, supplementName()));
  34     if (!controller) {
  35         controller = new DeviceLightController(document);
  36         DocumentSupplement::provideTo(document, supplementName(), adoptPtrWillBeNoop(controller));
  37     }
  38     return *controller;
  39 }
  40
  41 bool DeviceLightController::hasLastData()
  42 {
  43     return DeviceLightDispatcher::instance().latestDeviceLightData() >= 0;
  44 }
  45
  46 void DeviceLightController::registerWithDispatcher()
  47 {
  48     DeviceLightDispatcher::instance().addController(this);
  49 }
  50
  51 void DeviceLightController::unregisterWithDispatcher()
  52 {
  53     DeviceLightDispatcher::instance().removeController(this);
  54 }
  55
  56 PassRefPtrWillBeRawPtr<Event> DeviceLightController::lastEvent() const
  57 {
  58     return DeviceLightEvent::create(EventTypeNames::devicelight,
  59         DeviceLightDispatcher::instance().latestDeviceLightData());
  60 }
  61
  62 bool DeviceLightController::isNullEvent(Event* event) const
  63 {
  64     DeviceLightEvent* lightEvent = toDeviceLightEvent(event);
  65     return lightEvent->value() == std::numeric_limits<double>::infinity();
  66 }
  67
  68 const AtomicString& DeviceLightController::eventTypeName() const
  69 {
  70     return EventTypeNames::devicelight;
  71 }
  72
  73 void DeviceLightController::trace(Visitor* visitor)
  74 {
  75     DeviceSingleWindowEventController::trace(visitor);
  76     DocumentSupplement::trace(visitor);
  77 }
  78
  79
  80 } // namespace blink