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/*
* Copyright (C) 2021 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
*/
#pragma once
#include "FloatSize.h"
#include "ScrollTypes.h"
namespace WebCore {
WEBCORE_EXPORT FloatSize unitVectorForScrollDirection(ScrollDirection);
struct KeyboardScroll {
FloatSize offset; // Points per increment.
FloatSize maximumVelocity; // Points per second.
FloatSize force;
ScrollGranularity granularity { ScrollGranularity::Line };
ScrollDirection direction { ScrollDirection::ScrollUp };
bool operator==(const KeyboardScroll& other) const
{
return offset == other.offset
&& maximumVelocity == other.maximumVelocity
&& force == other.force
&& granularity == other.granularity
&& direction == other.direction;
}
};
struct KeyboardScrollParameters {
const float springMass;
const float springStiffness;
const float springDamping;
const float maximumVelocityMultiplier;
const float timeToMaximumVelocity;
const float rubberBandForce;
static constexpr KeyboardScrollParameters parameters()
{
#if PLATFORM(MAC) || PLATFORM(MACCATALYST)
return {
.springMass = 1,
.springStiffness = 175,
.springDamping = 20,
.maximumVelocityMultiplier = 25,
.timeToMaximumVelocity = 0.2,
.rubberBandForce = 3000
};
#else
return {
.springMass = 1,
.springStiffness = 109,
.springDamping = 20,
.maximumVelocityMultiplier = 25,
.timeToMaximumVelocity = 1.0,
.rubberBandForce = 5000
};
#endif
}
};
} // namespace WebCore
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