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/*
* 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/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;
scrollingCoordinator->updateHaveWheelEventHandlers();
}
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
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