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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, 2004, 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 
     24 #ifndef WheelEvent_h
     25 #define WheelEvent_h
     26 
     27 #include "core/dom/EventDispatchMediator.h"
     28 #include "core/dom/MouseEvent.h"
     29 #include "core/platform/graphics/FloatPoint.h"
     30 
     31 namespace WebCore {
     32 
     33 class PlatformWheelEvent;
     34 
     35 struct WheelEventInit : public MouseEventInit {
     36     WheelEventInit();
     37 
     38     int wheelDeltaX;
     39     int wheelDeltaY;
     40     unsigned deltaMode;
     41 };
     42 
     43 class WheelEvent : public MouseEvent {
     44 public:
     45     enum { TickMultiplier = 120 };
     46 
     47     enum DeltaMode {
     48         DOM_DELTA_PIXEL = 0,
     49         DOM_DELTA_LINE,
     50         DOM_DELTA_PAGE
     51     };
     52 
     53     static PassRefPtr<WheelEvent> create()
     54     {
     55         return adoptRef(new WheelEvent);
     56     }
     57 
     58     static PassRefPtr<WheelEvent> create(const AtomicString& type, const WheelEventInit& initializer)
     59     {
     60         return adoptRef(new WheelEvent(type, initializer));
     61     }
     62 
     63     static PassRefPtr<WheelEvent> create(const FloatPoint& wheelTicks,
     64         const FloatPoint& rawDelta, unsigned deltaMode, PassRefPtr<AbstractView> view,
     65         const IntPoint& screenLocation, const IntPoint& pageLocation,
     66         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool directionInvertedFromDevice)
     67     {
     68         return adoptRef(new WheelEvent(wheelTicks, rawDelta, deltaMode, view,
     69         screenLocation, pageLocation, ctrlKey, altKey, shiftKey, metaKey, directionInvertedFromDevice));
     70     }
     71 
     72     void initWheelEvent(int rawDeltaX, int rawDeltaY, PassRefPtr<AbstractView>,
     73         int screenX, int screenY, int pageX, int pageY,
     74         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);
     75 
     76     void initWebKitWheelEvent(int rawDeltaX, int rawDeltaY, PassRefPtr<AbstractView>,
     77         int screenX, int screenY, int pageX, int pageY,
     78         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);
     79 
     80     int wheelDelta() const { return m_wheelDelta.y() ? m_wheelDelta.y() : m_wheelDelta.x(); }
     81     int wheelDeltaX() const { return m_wheelDelta.x(); }
     82     int wheelDeltaY() const { return m_wheelDelta.y(); }
     83     int rawDeltaX() const { return m_rawDelta.x(); }
     84     int rawDeltaY() const { return m_rawDelta.y(); }
     85     unsigned deltaMode() const { return m_deltaMode; }
     86 
     87     bool webkitDirectionInvertedFromDevice() const { return m_directionInvertedFromDevice; }
     88 
     89     virtual const AtomicString& interfaceName() const;
     90     virtual bool isMouseEvent() const;
     91 
     92 private:
     93     WheelEvent();
     94     WheelEvent(const AtomicString&, const WheelEventInit&);
     95     WheelEvent(const FloatPoint& wheelTicks, const FloatPoint& rawDelta,
     96         unsigned, PassRefPtr<AbstractView>, const IntPoint& screenLocation, const IntPoint& pageLocation,
     97         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool directionInvertedFromDevice);
     98 
     99     IntPoint m_wheelDelta;
    100     IntPoint m_rawDelta;
    101     unsigned m_deltaMode;
    102     bool m_directionInvertedFromDevice;
    103 };
    104 
    105 class WheelEventDispatchMediator : public EventDispatchMediator {
    106 public:
    107     static PassRefPtr<WheelEventDispatchMediator> create(const PlatformWheelEvent&, PassRefPtr<AbstractView>);
    108 private:
    109     WheelEventDispatchMediator(const PlatformWheelEvent&, PassRefPtr<AbstractView>);
    110     WheelEvent* event() const;
    111     virtual bool dispatchEvent(EventDispatcher*) const OVERRIDE;
    112 };
    113 
    114 } // namespace WebCore
    115 
    116 #endif // WheelEvent_h
    117