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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file GUI/View/ParEdit/ParSpinBox.cpp
//! @brief Implements class ParSpinBox.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "GUI/View/ParEdit/ParSpinBox.h"
#include <QLineEdit>
#include <QRegularExpression>
#include <QWheelEvent>
#include <cmath>
namespace {
const double upper_switch = 100;
const double lower_switch = 0.1;
const double min_val = std::numeric_limits<double>::min();
const double max_val = std::numeric_limits<double>::max();
bool useExponentialNotation(double val);
} // namespace
ParSpinBox::ParSpinBox(QWidget* parent, bool easyScrollable)
: QAbstractSpinBox(parent)
, m_value(0.0)
, m_min(-max_val)
, m_max(max_val)
, m_step(1.0)
, m_decimals(3)
, m_easy_scrollable(easyScrollable)
{
QLocale locale;
locale.setNumberOptions(QLocale::RejectGroupSeparator);
m_validator.setLocale(locale);
m_validator.setNotation(QDoubleValidator::ScientificNotation);
connect(this, &QAbstractSpinBox::editingFinished, this, &ParSpinBox::updateValue);
}
ParSpinBox::~ParSpinBox() = default;
void ParSpinBox::setValue(double val)
{
double old_val = m_value;
m_value = round(val, m_decimals);
updateText();
if (std::abs(old_val - m_value) > min_val)
emit valueChanged(m_value);
}
void ParSpinBox::updateValue()
{
double new_val = toDouble(text(), m_validator, m_min, m_max, m_value);
setValue(new_val);
}
void ParSpinBox::setSingleStep(double step)
{
m_step = step;
}
void ParSpinBox::setMinimum(double min)
{
m_min = min;
if (m_value < m_min)
setValue(m_min);
}
void ParSpinBox::setMaximum(double max)
{
m_max = max;
if (m_value > m_max)
setValue(m_max);
}
void ParSpinBox::setDecimals(int val)
{
if (val <= 0)
return;
m_decimals = val;
setValue(m_value);
}
void ParSpinBox::stepBy(int steps)
{
double new_val = round(m_value + m_step * steps, m_decimals);
if (inRange(new_val))
setValue(new_val);
}
QString ParSpinBox::toString(double val, int decimal_points)
{
QString result = useExponentialNotation(val) ? QString::number(val, 'e', decimal_points)
: QString::number(val, 'f', decimal_points);
return result.replace(QRegularExpression("(\\.?0+)?((e{1}[\\+|-]{1})(0+)?([1-9]{1}.*))?$"),
"\\3\\5");
}
double ParSpinBox::toDouble(QString text, const QDoubleValidator& validator, double min, double max,
double default_value)
{
int pos = 0;
if (validator.validate(text, pos) == QValidator::Acceptable) {
double new_val = validator.locale().toDouble(text);
if (std::abs(new_val) < min_val)
new_val = 0.0;
return new_val >= min && new_val <= max ? new_val : default_value;
}
return default_value;
}
double ParSpinBox::round(double val, int decimals)
{
return QString::number(val, 'e', decimals).toDouble();
}
void ParSpinBox::wheelEvent(QWheelEvent* event)
{
if (hasFocus() || m_easy_scrollable)
QAbstractSpinBox::wheelEvent(event);
else
event->ignore();
}
QAbstractSpinBox::StepEnabled ParSpinBox::stepEnabled() const
{
return isReadOnly() ? StepNone : StepUpEnabled | StepDownEnabled;
}
void ParSpinBox::updateText()
{
QString new_text = toString(m_value, m_decimals);
if (new_text != text())
lineEdit()->setText(new_text);
}
bool ParSpinBox::inRange(double val) const
{
return val >= m_min && val <= m_max;
}
namespace {
bool useExponentialNotation(double val)
{
const double abs_val = std::abs(val);
if (abs_val <= min_val)
return false;
return abs_val >= upper_switch || abs_val < lower_switch;
}
} // namespace
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