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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  * 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 
     25 #ifndef WheelEvent_h
     26 #define WheelEvent_h
     27 
     28 #include "core/events/EventDispatchMediator.h"
     29 #include "core/events/MouseEvent.h"
     30 #include "platform/geometry/FloatPoint.h"
     31 
     32 namespace blink {
     33 
     34 class PlatformWheelEvent;
     35 
     36 struct WheelEventInit : public MouseEventInit {
     37     WheelEventInit();
     38 
     39     double deltaX;
     40     double deltaY;
     41     double deltaZ;
     42     int wheelDeltaX; // Deprecated.
     43     int wheelDeltaY; // Deprecated.
     44     unsigned deltaMode;
     45 };
     46 
     47 class WheelEvent FINAL : public MouseEvent {
     48     DEFINE_WRAPPERTYPEINFO();
     49 public:
     50     enum { TickMultiplier = 120 };
     51 
     52     enum DeltaMode {
     53         DOM_DELTA_PIXEL = 0,
     54         DOM_DELTA_LINE,
     55         DOM_DELTA_PAGE
     56     };
     57 
     58     static PassRefPtrWillBeRawPtr<WheelEvent> create()
     59     {
     60         return adoptRefWillBeNoop(new WheelEvent);
     61     }
     62 
     63     static PassRefPtrWillBeRawPtr<WheelEvent> create(const AtomicString& type, const WheelEventInit& initializer)
     64     {
     65         return adoptRefWillBeNoop(new WheelEvent(type, initializer));
     66     }
     67 
     68     static PassRefPtrWillBeRawPtr<WheelEvent> create(const FloatPoint& wheelTicks,
     69         const FloatPoint& rawDelta, unsigned deltaMode, PassRefPtrWillBeRawPtr<AbstractView> view,
     70         const IntPoint& screenLocation, const IntPoint& pageLocation,
     71         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     72     {
     73         return adoptRefWillBeNoop(new WheelEvent(wheelTicks, rawDelta, deltaMode, view,
     74         screenLocation, pageLocation, ctrlKey, altKey, shiftKey, metaKey));
     75     }
     76 
     77     double deltaX() const { return m_deltaX; } // Positive when scrolling right.
     78     double deltaY() const { return m_deltaY; } // Positive when scrolling down.
     79     double deltaZ() const { return m_deltaZ; }
     80     int wheelDelta() const { return wheelDeltaY() ? wheelDeltaY() : wheelDeltaX(); } // Deprecated.
     81     int wheelDeltaX() const { return m_wheelDelta.x(); } // Deprecated, negative when scrolling right.
     82     int wheelDeltaY() const { return m_wheelDelta.y(); } // Deprecated, negative when scrolling down.
     83     unsigned deltaMode() const { return m_deltaMode; }
     84     float ticksX() const { return static_cast<float>(m_wheelDelta.x()) / TickMultiplier; }
     85     float ticksY() const { return static_cast<float>(m_wheelDelta.y()) / TickMultiplier; }
     86 
     87     virtual const AtomicString& interfaceName() const OVERRIDE;
     88     virtual bool isMouseEvent() const OVERRIDE;
     89     virtual bool isWheelEvent() const OVERRIDE;
     90 
     91     virtual void trace(Visitor*) OVERRIDE;
     92 
     93 private:
     94     WheelEvent();
     95     WheelEvent(const AtomicString&, const WheelEventInit&);
     96     WheelEvent(const FloatPoint& wheelTicks, const FloatPoint& rawDelta,
     97         unsigned, PassRefPtrWillBeRawPtr<AbstractView>, const IntPoint& screenLocation, const IntPoint& pageLocation,
     98         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);
     99 
    100     IntPoint m_wheelDelta;
    101     double m_deltaX;
    102     double m_deltaY;
    103     double m_deltaZ;
    104     unsigned m_deltaMode;
    105 };
    106 
    107 DEFINE_EVENT_TYPE_CASTS(WheelEvent);
    108 
    109 class WheelEventDispatchMediator FINAL : public EventDispatchMediator {
    110 public:
    111     static PassRefPtrWillBeRawPtr<WheelEventDispatchMediator> create(const PlatformWheelEvent&, PassRefPtrWillBeRawPtr<AbstractView>);
    112 private:
    113     WheelEventDispatchMediator(const PlatformWheelEvent&, PassRefPtrWillBeRawPtr<AbstractView>);
    114     WheelEvent* event() const;
    115     virtual bool dispatchEvent(EventDispatcher*) const OVERRIDE;
    116 };
    117 
    118 } // namespace blink
    119 
    120 #endif // WheelEvent_h
    121