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      1 /*
      2  * Copyright (C) 2001 Peter Kelly (pmk (at) post.com)
      3  * Copyright (C) 2001 Tobias Anton (anton (at) stud.fbi.fh-darmstadt.de)
      4  * Copyright (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com)
      5  * Copyright (C) 2003, 2005, 2006, 2008, 2010 Apple Inc. All rights reserved.
      6  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  */
     23 
     24 #include "config.h"
     25 #include "core/events/WheelEvent.h"
     26 
     27 #include "core/clipboard/DataTransfer.h"
     28 #include "platform/PlatformMouseEvent.h"
     29 #include "platform/PlatformWheelEvent.h"
     30 
     31 namespace blink {
     32 
     33 WheelEventInit::WheelEventInit()
     34     : deltaX(0)
     35     , deltaY(0)
     36     , deltaZ(0)
     37     , wheelDeltaX(0)
     38     , wheelDeltaY(0)
     39     , deltaMode(WheelEvent::DOM_DELTA_PIXEL)
     40 {
     41 }
     42 
     43 WheelEvent::WheelEvent()
     44     : m_deltaX(0)
     45     , m_deltaY(0)
     46     , m_deltaZ(0)
     47     , m_deltaMode(DOM_DELTA_PIXEL)
     48 {
     49 }
     50 
     51 WheelEvent::WheelEvent(const AtomicString& type, const WheelEventInit& initializer)
     52     : MouseEvent(type, initializer)
     53     , m_wheelDelta(initializer.wheelDeltaX ? initializer.wheelDeltaX : -initializer.deltaX, initializer.wheelDeltaY ? initializer.wheelDeltaY : -initializer.deltaY)
     54     , m_deltaX(initializer.deltaX ? initializer.deltaX : -initializer.wheelDeltaX)
     55     , m_deltaY(initializer.deltaY ? initializer.deltaY : -initializer.wheelDeltaY)
     56     , m_deltaZ(initializer.deltaZ)
     57     , m_deltaMode(initializer.deltaMode)
     58 {
     59 }
     60 
     61 WheelEvent::WheelEvent(const FloatPoint& wheelTicks, const FloatPoint& rawDelta, unsigned deltaMode,
     62     PassRefPtrWillBeRawPtr<AbstractView> view, const IntPoint& screenLocation, const IntPoint& pageLocation,
     63     bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     64     : MouseEvent(EventTypeNames::wheel, true, true, view, 0, screenLocation.x(), screenLocation.y(),
     65         pageLocation.x(), pageLocation.y(), 0, 0, ctrlKey, altKey, shiftKey, metaKey, 0, nullptr,
     66         nullptr, false, PlatformMouseEvent::RealOrIndistinguishable)
     67     , m_wheelDelta(wheelTicks.x() * TickMultiplier, wheelTicks.y() * TickMultiplier)
     68     , m_deltaX(-rawDelta.x())
     69     , m_deltaY(-rawDelta.y())
     70     , m_deltaZ(0)
     71     , m_deltaMode(deltaMode)
     72 {
     73 }
     74 
     75 const AtomicString& WheelEvent::interfaceName() const
     76 {
     77     return EventNames::WheelEvent;
     78 }
     79 
     80 bool WheelEvent::isMouseEvent() const
     81 {
     82     return false;
     83 }
     84 
     85 bool WheelEvent::isWheelEvent() const
     86 {
     87     return true;
     88 }
     89 
     90 void WheelEvent::trace(Visitor* visitor)
     91 {
     92     MouseEvent::trace(visitor);
     93 }
     94 
     95 inline static unsigned deltaMode(const PlatformWheelEvent& event)
     96 {
     97     return event.granularity() == ScrollByPageWheelEvent ? WheelEvent::DOM_DELTA_PAGE : WheelEvent::DOM_DELTA_PIXEL;
     98 }
     99 
    100 PassRefPtrWillBeRawPtr<WheelEventDispatchMediator> WheelEventDispatchMediator::create(const PlatformWheelEvent& event, PassRefPtrWillBeRawPtr<AbstractView> view)
    101 {
    102     return adoptRefWillBeNoop(new WheelEventDispatchMediator(event, view));
    103 }
    104 
    105 WheelEventDispatchMediator::WheelEventDispatchMediator(const PlatformWheelEvent& event, PassRefPtrWillBeRawPtr<AbstractView> view)
    106 {
    107     if (!(event.deltaX() || event.deltaY()))
    108         return;
    109 
    110     setEvent(WheelEvent::create(FloatPoint(event.wheelTicksX(), event.wheelTicksY()), FloatPoint(event.deltaX(), event.deltaY()),
    111         deltaMode(event), view, event.globalPosition(), event.position(),
    112         event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey()));
    113 }
    114 
    115 WheelEvent* WheelEventDispatchMediator::event() const
    116 {
    117     return toWheelEvent(EventDispatchMediator::event());
    118 }
    119 
    120 bool WheelEventDispatchMediator::dispatchEvent(EventDispatcher* dispatcher) const
    121 {
    122     ASSERT(event());
    123     return EventDispatchMediator::dispatchEvent(dispatcher) && !event()->defaultHandled();
    124 }
    125 
    126 } // namespace blink
    127