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/*
* Copyright (C) 2004, 2005, 2006, 2009 Apple 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 "platform/PlatformEvent.h"
#include "platform/geometry/IntPoint.h"
namespace blink {
// Wheel events come in two flavors:
// The ScrollByPixelWheelEvent is a fine-grained event that specifies the precise number of pixels to scroll. It is sent directly by MacBook touchpads on OS X,
// and synthesized in other cases where platforms generate line-by-line scrolling events.
// The ScrollByPageWheelEvent indicates that the wheel event should scroll an entire page. 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).
enum PlatformWheelEventGranularity {
ScrollByPageWheelEvent,
ScrollByPixelWheelEvent,
};
#if OS(MACOSX)
enum PlatformWheelEventPhase {
PlatformWheelEventPhaseNone = 0,
PlatformWheelEventPhaseBegan = 1 << 0,
PlatformWheelEventPhaseStationary = 1 << 1,
PlatformWheelEventPhaseChanged = 1 << 2,
PlatformWheelEventPhaseEnded = 1 << 3,
PlatformWheelEventPhaseCancelled = 1 << 4,
PlatformWheelEventPhaseMayBegin = 1 << 5,
};
#endif
class PlatformWheelEvent : public PlatformEvent {
public:
PlatformWheelEvent()
: PlatformEvent(PlatformEvent::Wheel)
, m_deltaX(0)
, m_deltaY(0)
, m_wheelTicksX(0)
, m_wheelTicksY(0)
, m_granularity(ScrollByPixelWheelEvent)
, m_hasPreciseScrollingDeltas(false)
, m_canScroll(true)
#if OS(MACOSX)
, m_phase(PlatformWheelEventPhaseNone)
, m_momentumPhase(PlatformWheelEventPhaseNone)
, m_canRubberbandLeft(true)
, m_canRubberbandRight(true)
#endif
{
}
PlatformWheelEvent(IntPoint position, IntPoint globalPosition, float deltaX, float deltaY, float wheelTicksX, float wheelTicksY, PlatformWheelEventGranularity granularity, bool shiftKey, bool ctrlKey, bool altKey, bool metaKey)
: PlatformEvent(PlatformEvent::Wheel, shiftKey, ctrlKey, altKey, metaKey, 0)
, m_position(position)
, m_globalPosition(globalPosition)
, m_deltaX(deltaX)
, m_deltaY(deltaY)
, m_wheelTicksX(wheelTicksX)
, m_wheelTicksY(wheelTicksY)
, m_granularity(granularity)
, m_hasPreciseScrollingDeltas(false)
, m_canScroll(true)
#if OS(MACOSX)
, m_phase(PlatformWheelEventPhaseNone)
, m_momentumPhase(PlatformWheelEventPhaseNone)
, m_canRubberbandLeft(true)
, m_canRubberbandRight(true)
#endif
{
}
const IntPoint& position() const { return m_position; } // PlatformWindow coordinates.
const IntPoint& globalPosition() const { return m_globalPosition; } // Screen coordinates.
float deltaX() const { return m_deltaX; }
float deltaY() const { return m_deltaY; }
float wheelTicksX() const { return m_wheelTicksX; }
float wheelTicksY() const { return m_wheelTicksY; }
PlatformWheelEventGranularity granularity() const { return m_granularity; }
bool hasPreciseScrollingDeltas() const { return m_hasPreciseScrollingDeltas; }
void setHasPreciseScrollingDeltas(bool b) { m_hasPreciseScrollingDeltas = b; }
bool canScroll() const { return m_canScroll; }
void setCanScroll(bool b) { m_canScroll = b; }
#if OS(MACOSX)
PlatformWheelEventPhase phase() const { return m_phase; }
PlatformWheelEventPhase momentumPhase() const { return m_momentumPhase; }
bool useLatchedEventNode() const { return m_momentumPhase == PlatformWheelEventPhaseBegan || m_momentumPhase == PlatformWheelEventPhaseChanged; }
bool canRubberbandLeft() const { return m_canRubberbandLeft; }
bool canRubberbandRight() const { return m_canRubberbandRight; }
#else
bool useLatchedEventNode() const { return false; }
#endif
protected:
IntPoint m_position;
IntPoint m_globalPosition;
float m_deltaX;
float m_deltaY;
float m_wheelTicksX;
float m_wheelTicksY;
PlatformWheelEventGranularity m_granularity;
bool m_hasPreciseScrollingDeltas;
bool m_canScroll;
#if OS(MACOSX)
PlatformWheelEventPhase m_phase;
PlatformWheelEventPhase m_momentumPhase;
bool m_canRubberbandLeft;
bool m_canRubberbandRight;
#endif
};
} // namespace blink
#endif // PlatformWheelEvent_h
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