wheelevent.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2001 Peter Kelly ([e-mail])
 * Copyright (C) 2001 Tobias Anton ([e-mail])
 * Copyright (C) 2006 Samuel Weinig ([e-mail])
 * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef WheelEvent_h
#define WheelEvent_h

#include "MouseRelatedEvent.h"

namespace WebCore {

    // extension: mouse wheel event
    class WheelEvent : public MouseRelatedEvent {
    public:
        static PassRefPtr<WheelEvent> create()
        {
            return adoptRef(new WheelEvent);
        }
        static PassRefPtr<WheelEvent> create(float wheelDeltaX, float wheelDeltaY, PassRefPtr<AbstractView> view,
            int screenX, int screenY, int pageX, int pageY,
            bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
        {
            return adoptRef(new WheelEvent(wheelDeltaX, wheelDeltaY, view, screenX, screenY, pageX, pageY,
                ctrlKey, altKey, shiftKey, metaKey));
        }

        void initWheelEvent(int wheelDeltaX, int wheelDeltaY, PassRefPtr<AbstractView>,
                            int screenX, int screenY, int pageX, int pageY,
                            bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);

        int wheelDelta() const { if (m_wheelDeltaY == 0) return m_wheelDeltaX; return m_wheelDeltaY; }
        int wheelDeltaX() const { return m_wheelDeltaX; }
        int wheelDeltaY() const { return m_wheelDeltaY; }

        // Needed for Objective-C legacy support
        bool isHorizontal() const { return m_wheelDeltaX; }

    private:
        WheelEvent();
        WheelEvent(float wheelDeltaX, float wheelDeltaY, PassRefPtr<AbstractView>,
                   int screenX, int screenY, int pageX, int pageY,
                   bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);

        virtual bool isWheelEvent() const;

        int m_wheelDeltaX;
        int m_wheelDeltaY;
    };

} // namespace WebCore

#endif // WheelEvent_h