| /* |
| * 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 |