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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  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #include "config.h"
     24 #include "core/dom/WheelEvent.h"
     25 
     26 #include "core/dom/Clipboard.h"
     27 #include "core/dom/EventNames.h"
     28 #include "core/platform/PlatformWheelEvent.h"
     29 
     30 namespace WebCore {
     31 
     32 WheelEventInit::WheelEventInit()
     33     : wheelDeltaX(0)
     34     , wheelDeltaY(0)
     35     , deltaMode(WheelEvent::DOM_DELTA_PIXEL)
     36 {
     37 }
     38 
     39 WheelEvent::WheelEvent()
     40     : m_deltaMode(DOM_DELTA_PIXEL)
     41     , m_directionInvertedFromDevice(false)
     42 {
     43     ScriptWrappable::init(this);
     44 }
     45 
     46 WheelEvent::WheelEvent(const AtomicString& type, const WheelEventInit& initializer)
     47     : MouseEvent(type, initializer)
     48     , m_wheelDelta(IntPoint(initializer.wheelDeltaX, initializer.wheelDeltaY))
     49     , m_deltaMode(initializer.deltaMode)
     50 {
     51     ScriptWrappable::init(this);
     52 }
     53 
     54 WheelEvent::WheelEvent(const FloatPoint& wheelTicks, const FloatPoint& rawDelta, unsigned deltaMode,
     55     PassRefPtr<AbstractView> view, const IntPoint& screenLocation, const IntPoint& pageLocation,
     56     bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool directionInvertedFromDevice)
     57     : MouseEvent(eventNames().mousewheelEvent,
     58                  true, true, view, 0, screenLocation.x(), screenLocation.y(),
     59                  pageLocation.x(), pageLocation.y(),
     60                  0, 0,
     61                  ctrlKey, altKey, shiftKey, metaKey, 0, 0, 0, false)
     62     , m_wheelDelta(IntPoint(static_cast<int>(wheelTicks.x() * TickMultiplier), static_cast<int>(wheelTicks.y() * TickMultiplier)))
     63     , m_rawDelta(roundedIntPoint(rawDelta))
     64     , m_deltaMode(deltaMode)
     65     , m_directionInvertedFromDevice(directionInvertedFromDevice)
     66 {
     67     ScriptWrappable::init(this);
     68 }
     69 
     70 void WheelEvent::initWheelEvent(int rawDeltaX, int rawDeltaY, PassRefPtr<AbstractView> view,
     71                                 int screenX, int screenY, int pageX, int pageY,
     72                                 bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     73 {
     74     if (dispatched())
     75         return;
     76 
     77     initUIEvent(eventNames().mousewheelEvent, true, true, view, 0);
     78 
     79     m_screenLocation = IntPoint(screenX, screenY);
     80     m_ctrlKey = ctrlKey;
     81     m_altKey = altKey;
     82     m_shiftKey = shiftKey;
     83     m_metaKey = metaKey;
     84 
     85     // Normalize to the Windows 120 multiple
     86     m_wheelDelta = IntPoint(rawDeltaX * TickMultiplier, rawDeltaY * TickMultiplier);
     87 
     88     m_rawDelta = IntPoint(rawDeltaX, rawDeltaY);
     89     m_deltaMode = DOM_DELTA_PIXEL;
     90     m_directionInvertedFromDevice = false;
     91 
     92     initCoordinates(IntPoint(pageX, pageY));
     93 }
     94 
     95 void WheelEvent::initWebKitWheelEvent(int rawDeltaX, int rawDeltaY, PassRefPtr<AbstractView> view,
     96                                       int screenX, int screenY, int pageX, int pageY,
     97                                       bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     98 {
     99     initWheelEvent(rawDeltaX, rawDeltaY, view, screenX, screenY, pageX, pageY,
    100                    ctrlKey, altKey, shiftKey, metaKey);
    101 }
    102 
    103 const AtomicString& WheelEvent::interfaceName() const
    104 {
    105     return eventNames().interfaceForWheelEvent;
    106 }
    107 
    108 bool WheelEvent::isMouseEvent() const
    109 {
    110     return false;
    111 }
    112 
    113 inline static unsigned deltaMode(const PlatformWheelEvent& event)
    114 {
    115     return event.granularity() == ScrollByPageWheelEvent ? WheelEvent::DOM_DELTA_PAGE : WheelEvent::DOM_DELTA_PIXEL;
    116 }
    117 
    118 PassRefPtr<WheelEventDispatchMediator> WheelEventDispatchMediator::create(const PlatformWheelEvent& event, PassRefPtr<AbstractView> view)
    119 {
    120     return adoptRef(new WheelEventDispatchMediator(event, view));
    121 }
    122 
    123 WheelEventDispatchMediator::WheelEventDispatchMediator(const PlatformWheelEvent& event, PassRefPtr<AbstractView> view)
    124 {
    125     if (!(event.deltaX() || event.deltaY()))
    126         return;
    127 
    128     setEvent(WheelEvent::create(FloatPoint(event.wheelTicksX(), event.wheelTicksY()), FloatPoint(event.deltaX(), event.deltaY()),
    129         deltaMode(event), view, event.globalPosition(), event.position(),
    130         event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), event.directionInvertedFromDevice()));
    131 }
    132 
    133 WheelEvent* WheelEventDispatchMediator::event() const
    134 {
    135     return static_cast<WheelEvent*>(EventDispatchMediator::event());
    136 }
    137 
    138 bool WheelEventDispatchMediator::dispatchEvent(EventDispatcher* dispatcher) const
    139 {
    140     ASSERT(event());
    141     return EventDispatchMediator::dispatchEvent(dispatcher) && !event()->defaultHandled();
    142 }
    143 
    144 } // namespace WebCore
    145