StrictDoubleValidator.h

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#pragma once
 
#include <QDoubleValidator>

class StrictDoubleValidator : public QDoubleValidator
{
public:
    StrictDoubleValidator ( double min, double max, std::size_t decimals, QObject* parent = nullptr) :
        QDoubleValidator( min, max, decimals, parent)
    {}
 
    explicit StrictDoubleValidator(QObject* parent = nullptr)
        : QDoubleValidator(parent)
    {}
 
    QValidator::State validate(QString& input, int& pos) const override
    {
        Q_UNUSED(pos);
        if (input.isEmpty() || input == "." || input == "-") return Intermediate;
 
        QChar const decimalPoint('.');
        if (input.indexOf(decimalPoint) != -1)
        {
            int const charsAfterPoint = input.length() - input.indexOf(decimalPoint) - 1;
            if (charsAfterPoint > decimals())
                return QValidator::Invalid;
        }
 
        bool ok;
        double const d = input.toDouble(&ok);
 
        if (ok && d >= bottom() && d <= top())
            return QValidator::Acceptable;
        else
            return QValidator::Invalid;
    }
};