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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 "WheelEvent.h"
     25 
     26 #include "EventDispatcher.h"
     27 #include "EventNames.h"
     28 #include "PlatformWheelEvent.h"
     29 
     30 #include <wtf/MathExtras.h>
     31 
     32 namespace WebCore {
     33 
     34 WheelEvent::WheelEvent()
     35     : m_wheelDeltaX(0)
     36     , m_wheelDeltaY(0)
     37     , m_rawDeltaX(0)
     38     , m_rawDeltaY(0)
     39     , m_granularity(Pixel)
     40 {
     41 }
     42 
     43 WheelEvent::WheelEvent(float wheelTicksX, float wheelTicksY, float rawDeltaX, float rawDeltaY,
     44                        Granularity granularity, PassRefPtr<AbstractView> view,
     45                        int screenX, int screenY, int pageX, int pageY,
     46                        bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     47     : MouseRelatedEvent(eventNames().mousewheelEvent,
     48                         true, true, view, 0, screenX, screenY, pageX, pageY,
     49                         ctrlKey, altKey, shiftKey, metaKey)
     50     , m_wheelDeltaX(lroundf(wheelTicksX * 120))
     51     , m_wheelDeltaY(lroundf(wheelTicksY * 120)) // Normalize to the Windows 120 multiple
     52     , m_rawDeltaX(rawDeltaX)
     53     , m_rawDeltaY(rawDeltaY)
     54     , m_granularity(granularity)
     55 {
     56 }
     57 
     58 void WheelEvent::initWheelEvent(int rawDeltaX, int rawDeltaY, PassRefPtr<AbstractView> view,
     59                                 int screenX, int screenY, int pageX, int pageY,
     60                                 bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     61 {
     62     if (dispatched())
     63         return;
     64 
     65     initUIEvent(eventNames().mousewheelEvent, true, true, view, 0);
     66 
     67     m_screenX = screenX;
     68     m_screenY = screenY;
     69     m_ctrlKey = ctrlKey;
     70     m_altKey = altKey;
     71     m_shiftKey = shiftKey;
     72     m_metaKey = metaKey;
     73 
     74     // Normalize to the Windows 120 multiple
     75     m_wheelDeltaX = rawDeltaX * 120;
     76     m_wheelDeltaY = rawDeltaY * 120;
     77 
     78     m_rawDeltaX = rawDeltaX;
     79     m_rawDeltaY = rawDeltaY;
     80     m_granularity = Pixel;
     81 
     82     initCoordinates(pageX, pageY);
     83 }
     84 
     85 void WheelEvent::initWebKitWheelEvent(int rawDeltaX, int rawDeltaY, PassRefPtr<AbstractView> view,
     86                                       int screenX, int screenY, int pageX, int pageY,
     87                                       bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     88 {
     89     initWheelEvent(rawDeltaX, rawDeltaY, view, screenX, screenY, pageX, pageY,
     90                    ctrlKey, altKey, shiftKey, metaKey);
     91 }
     92 
     93 bool WheelEvent::isWheelEvent() const
     94 {
     95     return true;
     96 }
     97 
     98 inline static WheelEvent::Granularity granularity(const PlatformWheelEvent& event)
     99 {
    100     return event.granularity() == ScrollByPageWheelEvent ? WheelEvent::Page : WheelEvent::Pixel;
    101 }
    102 
    103 WheelEventDispatchMediator::WheelEventDispatchMediator(const PlatformWheelEvent& event, PassRefPtr<AbstractView> view)
    104 {
    105     if (!(event.deltaX() || event.deltaY()))
    106         return;
    107 
    108     setEvent(WheelEvent::create(event.wheelTicksX(), event.wheelTicksY(), event.deltaX(), event.deltaY(), granularity(event),
    109         view, event.globalX(), event.globalY(), event.x(), event.y(), event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey()));
    110 
    111 }
    112 
    113 WheelEvent* WheelEventDispatchMediator::event() const
    114 {
    115     return static_cast<WheelEvent*>(EventDispatchMediator::event());
    116 }
    117 
    118 bool WheelEventDispatchMediator::dispatchEvent(EventDispatcher* dispatcher) const
    119 {
    120     if (!event())
    121         return true;
    122 
    123     return EventDispatchMediator::dispatchEvent(dispatcher) && !event()->defaultHandled();
    124 }
    125 
    126 } // namespace WebCore
    127