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/*
* Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PlatformWheelEvent_h
#define PlatformWheelEvent_h
#include "IntPoint.h"
#if PLATFORM(MAC)
#ifdef __OBJC__
@class NSEvent;
#else
class NSEvent;
#endif
#endif
#if PLATFORM(WIN)
typedef struct HWND__* HWND;
typedef unsigned WPARAM;
typedef long LPARAM;
#endif
#if PLATFORM(GTK)
typedef struct _GdkEventScroll GdkEventScroll;
#endif
#if PLATFORM(QT)
QT_BEGIN_NAMESPACE
class QWheelEvent;
QT_END_NAMESPACE
#endif
#if PLATFORM(WX)
class wxMouseEvent;
class wxPoint;
#endif
namespace WebCore {
// Wheel events come in three flavors:
// The ScrollByPixelWheelEvent is a fine-grained event that specifies the precise number of pixels to scroll. It is sent by MacBook touchpads on OS X.
// For ScrollByPixelWheelEvents, the delta values contain the precise number of pixels to scroll.
// The ScrollByLineWheelEvent (the normal wheel event) sends a delta that can be corrected by a line multiplier to determine how many lines to scroll.
// If the platform has configurable line sensitivity (Windows), then the number of lines to scroll is used in order to behave like the platform.
// If the platform does not have configurable line sensitivity, then WebCore's default behavior is used (which scrolls 3 * the wheel line delta).
// For ScrollByLineWheelEvents, the delta values represent the number of lines to scroll.
// The ScrollByPageWheelEvent indicates that the wheel event should scroll an entire page instead. In this case WebCore's built in paging behavior is used to page
// up and down (you get the same behavior as if the user was clicking in a scrollbar track to page up or page down). Page scrolling only works in the vertical direction.
enum PlatformWheelEventGranularity { ScrollByLineWheelEvent, ScrollByPageWheelEvent, ScrollByPixelWheelEvent };
// WebCore uses a line multiple of ~3 (40px per line step) when doing arrowing with a scrollbar or line stepping via the arrow keys. The delta for wheeling is expressed
// as a # of actual lines (40 / 3 = 1 wheel line). We use the horizontalLineMultiplier and verticalLineMultiplier methods to incorporate the line multiplier into the deltas. On
// platforms that do not support wheel sensitivity, we use this hardcoded constant value of 3 to ensure that wheeling by default matches the WebCore multiplier you
// get when doing other kinds of line stepping.
const int cLineMultiplier = 3;
class PlatformWheelEvent {
public:
const IntPoint& pos() const { return m_position; } // PlatformWindow coordinates.
const IntPoint& globalPos() const { return m_globalPosition; } // Screen coordinates.
float deltaX() const { return m_deltaX; }
float deltaY() const { return m_deltaY; }
PlatformWheelEventGranularity granularity() const { return m_granularity; }
bool isAccepted() const { return m_isAccepted; }
bool shiftKey() const { return m_shiftKey; }
bool ctrlKey() const { return m_ctrlKey; }
bool altKey() const { return m_altKey; }
bool metaKey() const { return m_metaKey; }
int x() const { return m_position.x(); } // PlatformWindow coordinates.
int y() const { return m_position.y(); }
int globalX() const { return m_globalPosition.x(); } // Screen coordinates.
int globalY() const { return m_globalPosition.y(); }
void accept() { m_isAccepted = true; }
void ignore() { m_isAccepted = false; }
#if PLATFORM(MAC)
PlatformWheelEvent(NSEvent*);
#endif
#if PLATFORM(WIN)
PlatformWheelEvent(HWND, WPARAM, LPARAM, bool isHorizontal);
#endif
#if PLATFORM(GTK)
PlatformWheelEvent(GdkEventScroll*);
#endif
#if PLATFORM(QT)
PlatformWheelEvent(QWheelEvent*);
#endif
#if PLATFORM(WX)
PlatformWheelEvent(const wxMouseEvent&, const wxPoint&);
#endif
protected:
#if !PLATFORM(WIN)
int horizontalLineMultiplier() const { return cLineMultiplier; }
int verticalLineMultiplier() const { return cLineMultiplier; }
#else
int horizontalLineMultiplier() const;
int verticalLineMultiplier() const;
#endif
IntPoint m_position;
IntPoint m_globalPosition;
float m_deltaX;
float m_deltaY;
PlatformWheelEventGranularity m_granularity;
bool m_isAccepted;
bool m_shiftKey;
bool m_ctrlKey;
bool m_altKey;
bool m_metaKey;
};
} // namespace WebCore
#endif // PlatformWheelEvent_h
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