timestampspinbox.cpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2015 Jens Steinhauser <jens.steinhauser@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "timestampspinbox.hpp"

#include <QLineEdit>
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
#include <QRegularExpression>
#else
#include <QRegExp>
#endif

namespace pv {
namespace widgets {

TimestampSpinBox::TimestampSpinBox(QWidget* parent)
    : QAbstractSpinBox(parent)
    , precision_(9)
    , stepsize_("1e-6")
{
    connect(this, SIGNAL(editingFinished()), this, SLOT(on_editingFinished()));
    connect(lineEdit(), SIGNAL(editingFinished()), this, SLOT(on_editingFinished()));

    updateEdit();
}

void TimestampSpinBox::stepBy(int steps)
{
    setValue(value_ + steps * stepsize_);
}

QAbstractSpinBox::StepEnabled TimestampSpinBox::stepEnabled() const
{
    return QAbstractSpinBox::StepUpEnabled | QAbstractSpinBox::StepDownEnabled;
}

unsigned TimestampSpinBox::precision() const
{
    return precision_;
}

void TimestampSpinBox::setPrecision(unsigned precision)
{
    precision_ = precision;
    updateEdit();
}

const pv::util::Timestamp& TimestampSpinBox::singleStep() const
{
    return stepsize_;
}

void TimestampSpinBox::setSingleStep(const pv::util::Timestamp& step)
{
    stepsize_ = step;
}

const pv::util::Timestamp& TimestampSpinBox::value() const
{
    return value_;
}

QSize TimestampSpinBox::minimumSizeHint() const
{
    const QFontMetrics fm(fontMetrics());
    const int l = round(value_).str().size() + precision_ + 10;
    const int w = util::text_width(fm, QString(l, '0'));
    const int h = lineEdit()->minimumSizeHint().height();
    return QSize(w, h);
}

void TimestampSpinBox::setValue(const pv::util::Timestamp& val)
{
    if (val == value_)
        return;

    value_ = val;
    updateEdit();
    valueChanged(value_);
}

void TimestampSpinBox::on_editingFinished()
{
    static const auto re_pattern = R"(\s*([-+]?)\s*([0-9]+\.?[0-9]*).*)";

    bool has_match;
    QStringList captures;
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    QRegularExpression re(re_pattern);
    has_match = re.match(text()).hasMatch();
    if (has_match) {
        captures = re.match(text()).capturedTexts();
    }
#else
    QRegExp re(re_pattern);
    has_match = re.exactMatch(text());
    if (has_match) {
        captures = re.capturedTexts();
    }
#endif

    if (has_match) {
        captures.removeFirst(); // remove entire match
        QString str = captures.join("");
        setValue(pv::util::Timestamp(str.toStdString()));

    } else {
        // replace the malformed entered string with the old value
        updateEdit();
    }
}

void TimestampSpinBox::updateEdit()
{
    QString newtext = pv::util::format_time_si(
        value_, pv::util::SIPrefix::none, precision_);
    const QSignalBlocker blocker(lineEdit());
    // Keep cursor position
    int cursor = lineEdit()->cursorPosition();
    lineEdit()->setText(newtext);
    lineEdit()->setCursorPosition(cursor);
}

}  // namespace widgets
}  // namespace pv