src/third_party/WebKit/Source/modules/device_orientation/DeviceOrientationController.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_orientation/DeviceOrientationController.h"
   7
   8 #include "core/dom/Document.h"
   9 #include "modules/EventModules.h"
  10 #include "modules/device_orientation/DeviceOrientationData.h"
  11 #include "modules/device_orientation/DeviceOrientationDispatcher.h"
  12 #include "modules/device_orientation/DeviceOrientationEvent.h"
  13
  14 namespace WebCore {
  15
  16 DeviceOrientationController::DeviceOrientationController(Document& document)
  17     : DeviceSingleWindowEventController(document)
  18 {
  19 }
  20
  21 DeviceOrientationController::~DeviceOrientationController()
  22 {
  23     stopUpdating();
  24 }
  25
  26 void DeviceOrientationController::didUpdateData()
  27 {
  28     if (m_overrideOrientationData)
  29         return;
  30     dispatchDeviceEvent(lastEvent());
  31 }
  32
  33 const char* DeviceOrientationController::supplementName()
  34 {
  35     return "DeviceOrientationController";
  36 }
  37
  38 DeviceOrientationController& DeviceOrientationController::from(Document& document)
  39 {
  40     DeviceOrientationController* controller = static_cast<DeviceOrientationController*>(DocumentSupplement::from(document, supplementName()));
  41     if (!controller) {
  42         controller = new DeviceOrientationController(document);
  43         DocumentSupplement::provideTo(document, supplementName(), adoptPtrWillBeNoop(controller));
  44     }
  45     return *controller;
  46 }
  47
  48 DeviceOrientationData* DeviceOrientationController::lastData() const
  49 {
  50     return m_overrideOrientationData ? m_overrideOrientationData.get() : DeviceOrientationDispatcher::instance().latestDeviceOrientationData();
  51 }
  52
  53 bool DeviceOrientationController::hasLastData()
  54 {
  55     return lastData();
  56 }
  57
  58 void DeviceOrientationController::registerWithDispatcher()
  59 {
  60     DeviceOrientationDispatcher::instance().addController(this);
  61 }
  62
  63 void DeviceOrientationController::unregisterWithDispatcher()
  64 {
  65     DeviceOrientationDispatcher::instance().removeController(this);
  66 }
  67
  68 PassRefPtrWillBeRawPtr<Event> DeviceOrientationController::lastEvent() const
  69 {
  70     return DeviceOrientationEvent::create(eventTypeName(), lastData());
  71 }
  72
  73 bool DeviceOrientationController::isNullEvent(Event* event) const
  74 {
  75     DeviceOrientationEvent* orientationEvent = toDeviceOrientationEvent(event);
  76     return !orientationEvent->orientation()->canProvideEventData();
  77 }
  78
  79 const AtomicString& DeviceOrientationController::eventTypeName() const
  80 {
  81     return EventTypeNames::deviceorientation;
  82 }
  83
  84 void DeviceOrientationController::setOverride(DeviceOrientationData* deviceOrientationData)
  85 {
  86     ASSERT(deviceOrientationData);
  87     m_overrideOrientationData = deviceOrientationData;
  88     dispatchDeviceEvent(lastEvent());
  89 }
  90
  91 void DeviceOrientationController::clearOverride()
  92 {
  93     if (!m_overrideOrientationData)
  94         return;
  95     m_overrideOrientationData.clear();
  96     if (lastData())
  97         didUpdateData();
  98 }
  99
 100 void DeviceOrientationController::trace(Visitor* visitor)
 101 {
 102     visitor->trace(m_overrideOrientationData);
 103     DocumentSupplement::trace(visitor);
 104 }
 105
 106 } // namespace WebCore