| /* |
| * 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/Frame.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(); |
| Frame* 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(); |
| Frame* 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(); |
| didAddWheelEventHandler(document); |
| } |
| |
| void WheelController::didRemoveEventListener(DOMWindow* window, const AtomicString& eventType) |
| { |
| if (eventType != EventTypeNames::wheel && eventType != EventTypeNames::mousewheel) |
| return; |
| |
| Document* document = window->document(); |
| didRemoveWheelEventHandler(document); |
| } |
| |
| } // namespace WebCore |