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/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010 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.
*
*/
#pragma once
#include "Decimal.h"
#include <wtf/Forward.h>
namespace WebCore {
enum class AnyStepHandling : bool { Reject, Default };
enum class RangeLimitations : bool { Valid, Invalid };
class StepRange {
public:
enum StepValueShouldBe {
StepValueShouldBeReal,
ParsedStepValueShouldBeInteger,
ScaledStepValueShouldBeInteger,
};
struct StepDescription {
WTF_MAKE_FAST_ALLOCATED;
public:
int defaultStep { 1 };
int defaultStepBase { 0 };
int stepScaleFactor { 1 };
StepValueShouldBe stepValueShouldBe { StepValueShouldBeReal };
constexpr StepDescription(int defaultStep, int defaultStepBase, int stepScaleFactor, StepValueShouldBe stepValueShouldBe = StepValueShouldBeReal)
: defaultStep(defaultStep)
, defaultStepBase(defaultStepBase)
, stepScaleFactor(stepScaleFactor)
, stepValueShouldBe(stepValueShouldBe)
{
}
StepDescription() = default;
Decimal defaultValue() const
{
return defaultStep * stepScaleFactor;
}
};
enum class IsReversible : bool { No, Yes };
StepRange();
StepRange(const StepRange&);
StepRange(const Decimal& stepBase, RangeLimitations, const Decimal& minimum, const Decimal& maximum, const Decimal& step, const StepDescription&, IsReversible = IsReversible::No);
Decimal acceptableError() const;
Decimal alignValueForStep(const Decimal& currentValue, const Decimal& newValue) const;
Decimal clampValue(const Decimal& value) const;
bool hasStep() const { return m_hasStep; }
bool hasRangeLimitations() const { return m_hasRangeLimitations; }
Decimal maximum() const { return m_maximum; }
Decimal minimum() const { return m_minimum; }
Decimal stepSnappedMaximum() const;
static Decimal parseStep(AnyStepHandling, const StepDescription&, StringView);
Decimal step() const { return m_step; }
Decimal stepBase() const { return m_stepBase; }
int stepScaleFactor() const { return m_stepDescription.stepScaleFactor; }
bool stepMismatch(const Decimal&) const;
bool isReversible() const { return m_isReversible; }
// Clamp the middle value according to the step
Decimal defaultValue() const
{
return clampValue((m_minimum + m_maximum) / 2);
}
// Map value into 0-1 range
Decimal proportionFromValue(const Decimal& value) const
{
if (m_minimum == m_maximum)
return 0;
return (value - m_minimum) / (m_maximum - m_minimum);
}
// Map from 0-1 range to value
Decimal valueFromProportion(const Decimal& proportion) const
{
return m_minimum + proportion * (m_maximum - m_minimum);
}
private:
StepRange& operator =(const StepRange&);
Decimal roundByStep(const Decimal& value, const Decimal& base) const;
const Decimal m_maximum; // maximum must be >= minimum.
const Decimal m_minimum;
const Decimal m_step;
const Decimal m_stepBase;
const StepDescription m_stepDescription;
const bool m_hasRangeLimitations { false };
const bool m_hasStep { false };
const bool m_isReversible { false };
};
} // namespace WebCore
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