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