61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
/*
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* Copyright (C) 2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "ScrollTypes.h"
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namespace WebCore {
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WEBCORE_EXPORT FloatSize unitVectorForScrollDirection(ScrollDirection);
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struct KeyboardScroll {
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FloatSize offset; // Points per increment.
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FloatSize maximumVelocity; // Points per second.
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FloatSize force;
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ScrollGranularity granularity;
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ScrollDirection direction;
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};
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struct KeyboardScrollParameters {
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float springMass { 1 };
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float springStiffness { 109 };
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float springDamping { 20 };
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float maximumVelocityMultiplier { 25 };
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float timeToMaximumVelocity { 1 };
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float rubberBandForce { 5000 };
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static const KeyboardScrollParameters& parameters()
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{
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static const KeyboardScrollParameters parameters;
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return parameters;
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}
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};
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} // namespace WebCore
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