Generalize and refactor DeviceSensorEvent* architecture to support multi-event type targets.

Source/modules/device_orientation/DeviceMotionController.cpp

Index: Source/modules/device_orientation/DeviceMotionController.cpp
diff --git a/Source/modules/device_orientation/DeviceMotionController.cpp b/Source/modules/device_orientation/DeviceMotionController.cpp
index 02498d07240ac6daa7bd41d6b0409517ad44a915..ed76d86d4db46910b7334b8c8500fbf526fb9a93 100644
--- a/Source/modules/device_orientation/DeviceMotionController.cpp
+++ b/Source/modules/device_orientation/DeviceMotionController.cpp
@@ -1,35 +1,12 @@
-/*
- * Copyright 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2012 Samsung Electronics. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 #include "config.h"
 #include "modules/device_orientation/DeviceMotionController.h"
 
 #include "core/dom/Document.h"
-#include "core/frame/DOMWindow.h"
-#include "core/page/Page.h"
+#include "modules/EventModules.h"
 #include "modules/device_orientation/DeviceMotionData.h"
 #include "modules/device_orientation/DeviceMotionDispatcher.h"
 #include "modules/device_orientation/DeviceMotionEvent.h"
@@ -37,9 +14,7 @@
 namespace WebCore {
 
 DeviceMotionController::DeviceMotionController(Document& document)
-    : DeviceSensorEventController(document.page())
-    , DOMWindowLifecycleObserver(document.domWindow())
-    , m_document(document)
+    : DeviceSingleWindowEventController(document)
 {
 }
 
@@ -48,11 +23,6 @@ DeviceMotionController::~DeviceMotionController()
     stopUpdating();
 }
 
-void DeviceMotionController::didChangeDeviceMotion(DeviceMotionData* deviceMotionData)
-{
-    dispatchDeviceEvent(DeviceMotionEvent::create(EventTypeNames::devicemotion, deviceMotionData));
-}
-
 const char* DeviceMotionController::supplementName()
 {
     return "DeviceMotionController";
@@ -73,56 +43,30 @@ bool DeviceMotionController::hasLastData()
     return DeviceMotionDispatcher::instance().latestDeviceMotionData();
 }
 
-PassRefPtrWillBeRawPtr<Event> DeviceMotionController::getLastEvent()
-{
-    return DeviceMotionEvent::create(EventTypeNames::devicemotion, DeviceMotionDispatcher::instance().latestDeviceMotionData());
-}
-
 void DeviceMotionController::registerWithDispatcher()
 {
-    DeviceMotionDispatcher::instance().addDeviceMotionController(this);
+    DeviceMotionDispatcher::instance().addController(this);
 }
 
 void DeviceMotionController::unregisterWithDispatcher()
 {
-    DeviceMotionDispatcher::instance().removeDeviceMotionController(this);
-}
-
-bool DeviceMotionController::isNullEvent(Event* event)
-{
-    DeviceMotionEvent* motionEvent = toDeviceMotionEvent(event);
-    return !motionEvent->deviceMotionData()->canProvideEventData();
+    DeviceMotionDispatcher::instance().removeController(this);
 }
 
-Document* DeviceMotionController::document()
+PassRefPtrWillBeRawPtr<Event> DeviceMotionController::lastEvent() const
 {
-    return &m_document;
-}
-
-void DeviceMotionController::didAddEventListener(DOMWindow* window, const AtomicString& eventType)
-{
-    if (eventType != EventTypeNames::devicemotion)
-        return;
-
-    if (page() && page()->visibilityState() == PageVisibilityStateVisible)
-        startUpdating();
-
-    m_hasEventListener = true;
+    return DeviceMotionEvent::create(EventTypeNames::devicemotion, DeviceMotionDispatcher::instance().latestDeviceMotionData());
 }
 
-void DeviceMotionController::didRemoveEventListener(DOMWindow* window, const AtomicString& eventType)
+bool DeviceMotionController::isNullEvent(Event* event) const
 {
-    if (eventType != EventTypeNames::devicemotion || window->hasEventListeners(EventTypeNames::devicemotion))
-        return;
-
-    stopUpdating();
-    m_hasEventListener = false;
+    DeviceMotionEvent* motionEvent = toDeviceMotionEvent(event);
+    return !motionEvent->deviceMotionData()->canProvideEventData();
 }
 
-void DeviceMotionController::didRemoveAllEventListeners(DOMWindow*)
+const AtomicString& DeviceMotionController::eventTypeName() const
 {
-    stopUpdating();
-    m_hasEventListener = false;
+    return EventTypeNames::devicemotion;
 }
 
 } // namespace WebCore