forked from Qortal/Brooklyn
145 lines
3.0 KiB
C++
145 lines
3.0 KiB
C++
/*
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SPDX-FileCopyrightText: 2013 Alexander Mezin <mezin.alexander@gmail.com>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "customslider.h"
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#include <cmath>
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#include <QResizeEvent>
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CustomSlider::Interpolator::~Interpolator()
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{
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}
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double CustomSlider::Interpolator::absolute(double relative, double minimum, double maximum) const
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{
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return relative * (maximum - minimum) + minimum;
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}
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double CustomSlider::Interpolator::relative(double absolute, double minimum, double maximum) const
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{
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return (absolute - minimum) / (maximum - minimum);
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}
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double CustomSlider::SqrtInterpolator::absolute(double relative, double minimum, double maximum) const
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{
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relative *= relative;
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return Interpolator::absolute(relative, minimum, maximum);
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}
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double CustomSlider::SqrtInterpolator::relative(double absolute, double minimum, double maximum) const
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{
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double value = Interpolator::relative(absolute, minimum, maximum);
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return std::sqrt(value);
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}
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const CustomSlider::Interpolator CustomSlider::lerp;
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CustomSlider::CustomSlider(QWidget *parent)
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: QSlider(parent)
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, m_min(0.0)
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, m_max(1.0)
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, m_interpolator(&lerp)
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{
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setSingleStep(10);
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setPageStep(100);
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updateValue();
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updateRange(size());
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connect(this, &QAbstractSlider::actionTriggered, this, &CustomSlider::updateValue);
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}
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void CustomSlider::resizeEvent(QResizeEvent *e)
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{
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QSlider::resizeEvent(e);
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updateRange(e->size());
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}
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const CustomSlider::Interpolator *CustomSlider::interpolator() const
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{
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return m_interpolator;
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}
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void CustomSlider::setInterpolator(const CustomSlider::Interpolator *v)
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{
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m_interpolator = v;
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}
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void CustomSlider::setDoubleMinimum(double v)
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{
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m_min = v;
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}
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double CustomSlider::doubleMinimum() const
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{
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return m_min;
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}
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void CustomSlider::setDoubleMaximum(double v)
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{
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m_max = v;
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}
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double CustomSlider::doubleMaximum() const
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{
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return m_max;
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}
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double CustomSlider::doubleValue() const
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{
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return qBound(m_min, m_value, m_max);
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}
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void CustomSlider::setDoubleValue(double v)
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{
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if (m_value == v) {
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return;
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}
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m_value = v;
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int oldIntValue = value();
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moveSlider();
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if (value() != oldIntValue) {
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Q_EMIT valueChanged(doubleValue());
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}
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}
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double CustomSlider::intToDouble(int v) const
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{
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double relative = lerp.relative(v, minimum(), maximum());
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return m_interpolator->absolute(relative, m_min, m_max);
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}
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void CustomSlider::updateValue()
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{
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m_value = intToDouble(sliderPosition());
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Q_EMIT valueChanged(doubleValue());
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}
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double CustomSlider::fixup(double v) const
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{
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return intToDouble(doubleToInt(v));
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}
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int CustomSlider::doubleToInt(double v) const
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{
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double relative = m_interpolator->relative(v, m_min, m_max);
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double absolute = lerp.absolute(relative, minimum(), maximum());
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return static_cast<int>(std::floor(absolute + 0.5));
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}
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void CustomSlider::moveSlider()
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{
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setValue(doubleToInt(doubleValue()));
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}
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void CustomSlider::updateRange(const QSize &s)
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{
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setRange(0, (orientation() == Qt::Horizontal) ? s.width() : s.height());
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moveSlider();
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}
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