src/third_party/WebKit/Source/core/frame/DeviceSingleWindowEventController.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 "core/frame/DeviceSingleWindowEventController.h"
   7
   8 #include "core/dom/Document.h"
   9 #include "core/events/Event.h"
  10 #include "core/frame/LocalDOMWindow.h"
  11 #include "core/page/Page.h"
  12
  13 namespace blink {
  14
  15 DeviceSingleWindowEventController::DeviceSingleWindowEventController(Document& document)
  16     : PlatformEventController(document.page())
  17     , DOMWindowLifecycleObserver(document.domWindow())
  18     , m_needsCheckingNullEvents(true)
  19     , m_document(document)
  20 {
  21 }
  22
  23 DeviceSingleWindowEventController::~DeviceSingleWindowEventController()
  24 {
  25 }
  26
  27 void DeviceSingleWindowEventController::didUpdateData()
  28 {
  29     dispatchDeviceEvent(lastEvent());
  30 }
  31
  32 void DeviceSingleWindowEventController::dispatchDeviceEvent(PassRefPtrWillBeRawPtr<Event> prpEvent)
  33 {
  34     if (!document().domWindow() || document().activeDOMObjectsAreSuspended() || document().activeDOMObjectsAreStopped())
  35         return;
  36
  37     RefPtrWillBeRawPtr<Event> event = prpEvent;
  38     document().domWindow()->dispatchEvent(event);
  39
  40     if (m_needsCheckingNullEvents) {
  41         if (isNullEvent(event.get()))
  42             stopUpdating();
  43         else
  44             m_needsCheckingNullEvents = false;
  45     }
  46 }
  47
  48 void DeviceSingleWindowEventController::didAddEventListener(LocalDOMWindow* window, const AtomicString& eventType)
  49 {
  50     if (eventType != eventTypeName())
  51         return;
  52
  53     if (page() && page()->visibilityState() == PageVisibilityStateVisible)
  54         startUpdating();
  55
  56     m_hasEventListener = true;
  57 }
  58
  59 void DeviceSingleWindowEventController::didRemoveEventListener(LocalDOMWindow* window, const AtomicString& eventType)
  60 {
  61     if (eventType != eventTypeName() || window->hasEventListeners(eventTypeName()))
  62         return;
  63
  64     stopUpdating();
  65     m_hasEventListener = false;
  66 }
  67
  68 void DeviceSingleWindowEventController::didRemoveAllEventListeners(LocalDOMWindow*)
  69 {
  70     stopUpdating();
  71     m_hasEventListener = false;
  72 }
  73
  74 void DeviceSingleWindowEventController::trace(Visitor* visitor)
  75 {
  76     visitor->trace(m_document);
  77     PlatformEventController::trace(visitor);
  78 }
  79
  80 } // namespace blink