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27 #include "core/dom/WheelController.h"
29 #include "core/dom/Document.h"
30 #include "core/events/WheelEvent.h"
31 #include "core/frame/LocalFrame.h"
32 #include "core/page/Page.h"
33 #include "core/page/scrolling/ScrollingCoordinator.h"
37 WheelController::WheelController(Document& document)
38 : DOMWindowLifecycleObserver(document.domWindow())
39 , m_wheelEventHandlerCount(0)
43 WheelController::~WheelController()
47 const char* WheelController::supplementName()
49 return "WheelController";
52 WheelController* WheelController::from(Document& document)
54 WheelController* controller = static_cast<WheelController*>(DocumentSupplement::from(document, supplementName()));
56 controller = new WheelController(document);
57 DocumentSupplement::provideTo(document, supplementName(), adoptPtrWillBeNoop(controller));
62 static void wheelEventHandlerCountChanged(Document& document)
64 Page* page = document.page();
68 ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator();
69 if (!scrollingCoordinator)
72 scrollingCoordinator->updateHaveWheelEventHandlers();
75 void WheelController::didAddWheelEventHandler(Document& document)
77 ++m_wheelEventHandlerCount;
78 Page* page = document.page();
79 LocalFrame* mainFrame = page ? page->mainFrame() : 0;
81 mainFrame->notifyChromeClientWheelEventHandlerCountChanged();
83 wheelEventHandlerCountChanged(document);
86 void WheelController::didRemoveWheelEventHandler(Document& document)
88 ASSERT(m_wheelEventHandlerCount > 0);
89 --m_wheelEventHandlerCount;
90 Page* page = document.page();
91 LocalFrame* mainFrame = page ? page->mainFrame() : 0;
93 mainFrame->notifyChromeClientWheelEventHandlerCountChanged();
95 wheelEventHandlerCountChanged(document);
98 void WheelController::didAddEventListener(DOMWindow* window, const AtomicString& eventType)
100 if (eventType != EventTypeNames::wheel && eventType != EventTypeNames::mousewheel)
103 Document* document = window->document();
105 didAddWheelEventHandler(*document);
108 void WheelController::didRemoveEventListener(DOMWindow* window, const AtomicString& eventType)
110 if (eventType != EventTypeNames::wheel && eventType != EventTypeNames::mousewheel)
113 Document* document = window->document();
115 didRemoveWheelEventHandler(*document);
118 } // namespace WebCore