Add EventHandlerRegistry

Source/core/dom/WheelController.cpp

Index: Source/core/dom/WheelController.cpp
diff --git a/Source/core/dom/WheelController.cpp b/Source/core/dom/WheelController.cpp
deleted file mode 100644
index b241ad52cff223e50a93f45813933878a1b3099e..0000000000000000000000000000000000000000
--- a/Source/core/dom/WheelController.cpp
+++ /dev/null
@@ -1,123 +0,0 @@
-/*
- * Copyright (C) 2013 Google, Inc. 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.
- */
-
-#include "config.h"
-#include "core/dom/WheelController.h"
-
-#include "core/dom/Document.h"
-#include "core/events/ThreadLocalEventNames.h"
-#include "core/events/WheelEvent.h"
-#include "core/frame/LocalFrame.h"
-#include "core/page/Page.h"
-#include "core/page/scrolling/ScrollingCoordinator.h"
-
-namespace WebCore {
-
-WheelController::WheelController(Document& document)
-    : DOMWindowLifecycleObserver(document.domWindow())
-    , m_wheelEventHandlerCount(0)
-{
-}
-
-WheelController::~WheelController()
-{
-}
-
-const char* WheelController::supplementName()
-{
-    return "WheelController";
-}
-
-WheelController* WheelController::from(Document& document)
-{
-    WheelController* controller = static_cast<WheelController*>(DocumentSupplement::from(document, supplementName()));
-    if (!controller) {
-        controller = new WheelController(document);
-        DocumentSupplement::provideTo(document, supplementName(), adoptPtr(controller));
-    }
-    return controller;
-}
-
-static void wheelEventHandlerCountChanged(Document& document)
-{
-    Page* page = document.page();
-    if (!page)
-        return;
-
-    ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator();
-    if (!scrollingCoordinator)
-        return;
-
-    FrameView* frameView = document.view();
-    if (!frameView)
-        return;
-
-    scrollingCoordinator->frameViewWheelEventHandlerCountChanged(frameView);
-}
-
-void WheelController::didAddWheelEventHandler(Document& document)
-{
-    ++m_wheelEventHandlerCount;
-    Page* page = document.page();
-    LocalFrame* mainFrame = page ? page->mainFrame() : 0;
-    if (mainFrame)
-        mainFrame->notifyChromeClientWheelEventHandlerCountChanged();
-
-    wheelEventHandlerCountChanged(document);
-}
-
-void WheelController::didRemoveWheelEventHandler(Document& document)
-{
-    ASSERT(m_wheelEventHandlerCount > 0);
-    --m_wheelEventHandlerCount;
-    Page* page = document.page();
-    LocalFrame* mainFrame = page ? page->mainFrame() : 0;
-    if (mainFrame)
-        mainFrame->notifyChromeClientWheelEventHandlerCountChanged();
-
-    wheelEventHandlerCountChanged(document);
-}
-
-void WheelController::didAddEventListener(DOMWindow* window, const AtomicString& eventType)
-{
-    if (eventType != EventTypeNames::wheel && eventType != EventTypeNames::mousewheel)
-        return;
-
-    Document* document = window->document();
-    ASSERT(document);
-    didAddWheelEventHandler(*document);
-}
-
-void WheelController::didRemoveEventListener(DOMWindow* window, const AtomicString& eventType)
-{
-    if (eventType != EventTypeNames::wheel && eventType != EventTypeNames::mousewheel)
-        return;
-
-    Document* document = window->document();
-    ASSERT(document);
-    didRemoveWheelEventHandler(*document);
-}
-
-} // namespace WebCore