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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/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 }
     78 
     79 } // namespace blink
     80