double.cpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2013 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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 <cassert>

#include <QDebug>
#include <QDoubleSpinBox>

#include <libsigrokcxx/libsigrokcxx.hpp>

#include "double.hpp"

using boost::optional;
using std::pair;

namespace pv {
namespace prop {

Double::Double(QString name,
    QString desc,
    int decimals,
    QString suffix,
    optional< pair<double, double> > range,
    optional<double> step,
    Getter getter,
    Setter setter) :
    Property(name, desc, getter, setter),
    decimals_(decimals),
    suffix_(suffix),
    range_(range),
    step_(step),
    spin_box_(nullptr)
{
}

QWidget* Double::get_widget(QWidget *parent, bool auto_commit)
{
    if (spin_box_)
        return spin_box_;

    if (!getter_)
        return nullptr;

    try {
        Glib::VariantBase variant = getter_();
        if (!variant.gobj())
            return nullptr;
    } catch (const sigrok::Error &e) {
        qWarning() << tr("Querying config key %1 resulted in %2").arg(name_, e.what());
        return nullptr;
    }

    spin_box_ = new QDoubleSpinBox(parent);
    spin_box_->setDecimals(decimals_);
    spin_box_->setSuffix(suffix_);
    if (range_)
        spin_box_->setRange(range_->first, range_->second);
    if (step_)
        spin_box_->setSingleStep(*step_);

    update_widget();

    if (auto_commit)
        connect(spin_box_, SIGNAL(valueChanged(double)),
            this, SLOT(on_value_changed(double)));

    return spin_box_;
}

void Double::update_widget()
{
    if (!spin_box_)
        return;

    Glib::VariantBase variant;

    try {
        variant = getter_();
    } catch (const sigrok::Error &e) {
        qWarning() << tr("Querying config key %1 resulted in %2").arg(name_, e.what());
        return;
    }

    assert(variant.gobj());

    double value = Glib::VariantBase::cast_dynamic<Glib::Variant<double>>(
        variant).get();
    spin_box_->setValue(value);
}

void Double::commit()
{
    assert(setter_);

    if (!spin_box_)
        return;

    setter_(Glib::Variant<double>::create(spin_box_->value()));
}

void Double::on_value_changed(double)
{
    commit();
}

}  // namespace prop
}  // namespace pv