WebCore/dom/WheelEvent.cpp

   1 /*
   2  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
   3  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
   4  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
   5  * Copyright (C) 2003, 2005, 2006, 2008 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 "EventNames.h"
  27 #include <wtf/MathExtras.h>
  28
  29 namespace WebCore {
  30
  31 WheelEvent::WheelEvent()
  32     : m_wheelDeltaX(0)
  33     , m_wheelDeltaY(0)
  34 {
  35 }
  36
  37 WheelEvent::WheelEvent(float wheelDeltaX, float wheelDeltaY, PassRefPtr<AbstractView> view,
  38                        int screenX, int screenY, int pageX, int pageY,
  39                        bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
  40     : MouseRelatedEvent(eventNames().mousewheelEvent,
  41                         true, true, view, 0, screenX, screenY, pageX, pageY,
  42                         ctrlKey, altKey, shiftKey, metaKey)
  43     , m_wheelDeltaX(lroundf(wheelDeltaX) * 120)
  44     , m_wheelDeltaY(lroundf(wheelDeltaY) * 120) // Normalize to the Windows 120 multiple
  45 {
  46     // Rounding delta to zero makes no sense and breaks Google Maps, <http://bugs.webkit.org/show_bug.cgi?id=16078>.
  47     if (wheelDeltaX && !m_wheelDeltaX)
  48         m_wheelDeltaX = (wheelDeltaX > 0) ? 120 : -120;
  49     if (wheelDeltaY && !m_wheelDeltaY)
  50         m_wheelDeltaY = (wheelDeltaY > 0) ? 120 : -120;
  51 }
  52
  53 void WheelEvent::initWheelEvent(int wheelDeltaX, int wheelDeltaY, PassRefPtr<AbstractView> view,
  54                                 int screenX, int screenY, int pageX, int pageY,
  55                                 bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
  56 {
  57     if (dispatched())
  58         return;
  59
  60     initUIEvent(eventNames().mousewheelEvent, true, true, view, 0);
  61
  62     m_screenX = screenX;
  63     m_screenY = screenY;
  64     m_ctrlKey = ctrlKey;
  65     m_altKey = altKey;
  66     m_shiftKey = shiftKey;
  67     m_metaKey = metaKey;
  68     m_wheelDeltaX = wheelDeltaX;
  69     m_wheelDeltaY = wheelDeltaY;
  70
  71     initCoordinates(pageX, pageY);
  72 }
  73
  74
  75 bool WheelEvent::isWheelEvent() const
  76 {
  77     return true;
  78 }
  79
  80 } // namespace WebCore