/* ============================================================
 *
 * Date        : 2008-02-10
 * Description : a tool to fix automatically camera lens aberrations
 *
 * Copyright (C) 2008      by Adrian Schroeter <adrian at suse dot de>
 * Copyright (C) 2008-2017 by Gilles Caulier <caulier dot gilles at gmail dot 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, 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.
 *
 * ============================================================ */

#include "lensfuncameraselector.h"

// Qt includes

#include <QCheckBox>
#include <QGridLayout>
#include <QLabel>
#include <QString>
#include <QWidget>
#include <QApplication>
#include <QStyle>

// KDE includes

#include <kconfiggroup.h>
#include <klocalizedstring.h>

// Local includes

#include "dlayoutbox.h"
#include "digikam_debug.h"
#include "dcombobox.h"
#include "dnuminput.h"
#include "dexpanderbox.h"



namespace Digikam
{

class LensFunCameraSelector::Private
{
public:

    Private()
        : configUseMetadata(QLatin1String("UseMetadata")),
          configCameraModel(QLatin1String("CameraModel")),
          configCameraMake(QLatin1String("CameraMake")),
          configLensModel(QLatin1String("LensModel")),
          configSubjectDistance(QLatin1String("SubjectDistance")),
          configFocalLength(QLatin1String("FocalLength")),
          configCropFactor(QLatin1String("CropFactor")),
          configAperture(QLatin1String("Aperture")),
          redStyle(QLatin1String("QLabel {color: red;}")),
          orangeStyle(QLatin1String("QLabel {color: orange;}")),
          greenStyle(QLatin1String("QLabel {color: green;}"))
    {
        metadataUsage        = 0;
        make                 = 0;
        model                = 0;
        lens                 = 0;
        focal                = 0;
        aperture             = 0;
        distance             = 0;
        iface                = 0;
        metadataResult       = 0;
        makeLabel            = 0;
        modelLabel           = 0;
        lensLabel            = 0;
        focalLabel           = 0;
        aperLabel            = 0;
        distLabel            = 0;
        lensDescription      = 0;
        makeDescription      = 0;
        modelDescription     = 0;
        passiveMetadataUsage = false;
    }

    bool                passiveMetadataUsage;

    QCheckBox*          metadataUsage;
    QLabel*             metadataResult;
    QLabel*             makeLabel;
    QLabel*             modelLabel;
    QLabel*             lensLabel;
    QLabel*             focalLabel;
    QLabel*             aperLabel;
    QLabel*             distLabel;

    const QString       configUseMetadata;
    const QString       configCameraModel;
    const QString       configCameraMake;
    const QString       configLensModel;
    const QString       configSubjectDistance;
    const QString       configFocalLength;
    const QString       configCropFactor;
    const QString       configAperture;
    const QString       redStyle;
    const QString       orangeStyle;
    const QString       greenStyle;

    DAdjustableLabel* lensDescription;
    DAdjustableLabel* makeDescription;
    DAdjustableLabel* modelDescription;

    DComboBox*          make;
    DComboBox*          model;
    DComboBox*          lens;

    DDoubleNumInput*    focal;
    DDoubleNumInput*    aperture;
    DDoubleNumInput*    distance;

    DMetadata           metadata;

    LensFunIface*       iface;
};

LensFunCameraSelector::LensFunCameraSelector(QWidget* const parent)
    : QWidget(parent), d(new Private)
{
    d->iface                = new LensFunIface();

    QGridLayout* const grid = new QGridLayout(this);
    DHBox* const hbox       = new DHBox(this);
    d->metadataUsage        = new QCheckBox(i18n("Use Metadata"), hbox);
    QLabel* const space     = new QLabel(hbox);
    d->metadataResult       = new QLabel(hbox);
    hbox->setStretchFactor(space, 10);

    DHBox* const hbox1   = new DHBox(this);
    d->makeLabel         = new QLabel(i18nc("camera make",  "Make:"),  hbox1);
    QLabel* const space1 = new QLabel(hbox1);
    d->makeDescription   = new DAdjustableLabel(hbox1);
    hbox1->setStretchFactor(space1, 10);
    d->makeDescription->setAlignment(Qt::AlignVCenter | Qt::AlignRight);
    d->makeDescription->setWhatsThis(i18n("This is the camera maker description string found in image meta-data. "
                                          "This one is used to query and find relevant camera device information from Lensfun database."));

    d->make              = new DComboBox(this);
    d->make->setDefaultIndex(0);

    DHBox* const hbox2   = new DHBox(this);
    d->modelLabel        = new QLabel(i18nc("camera model", "Model:"), hbox2);
    QLabel* const space2 = new QLabel(hbox2);
    d->modelDescription  = new DAdjustableLabel(hbox2);
    hbox2->setStretchFactor(space2, 10);
    d->modelDescription->setAlignment(Qt::AlignVCenter | Qt::AlignRight);
    d->modelDescription->setWhatsThis(i18n("This is the camera model description string found in image meta-data. "
                                           "This one is used to query and found relevant camera device information from Lensfun database."));

    d->model             = new DComboBox(this);
    d->model->setDefaultIndex(0);

    DHBox* const hbox3   = new DHBox(this);
    d->lensLabel         = new QLabel(i18nc("camera lens",  "Lens:"),  hbox3);
    QLabel* const space3 = new QLabel(hbox3);
    d->lensDescription   = new DAdjustableLabel(hbox3);
    d->lensDescription->setAlignment(Qt::AlignVCenter | Qt::AlignRight);
    d->lensDescription->setWhatsThis(i18n("This is the lens description string found in image meta-data. "
                                          "This one is used to query and found relevant lens information from Lensfun database."));
    hbox3->setStretchFactor(space3, 10);

    d->lens              = new DComboBox(this);
    d->lens->setDefaultIndex(0);

    d->metadataUsage->setEnabled(false);
    d->metadataUsage->setCheckState(Qt::Unchecked);
    d->metadataUsage->setWhatsThis(i18n("Set this option to try to guess the right camera/lens settings "
                                        "from the image metadata (as Exif or XMP)."));

    d->focalLabel       = new QLabel(i18n("Focal Length (mm):"), this);
    d->aperLabel        = new QLabel(i18n("Aperture:"), this);
    d->distLabel        = new QLabel(i18n("Subject Distance (m):"), this);

    d->focal            = new DDoubleNumInput(this);
    d->focal->setDecimals(1);
    d->focal->setRange(1.0, 10000.0, 0.01);
    d->focal->setDefaultValue(1.0);

    d->aperture         = new DDoubleNumInput(this);
    d->aperture->setDecimals(1);
    d->aperture->setRange(1.1, 256.0, 0.1);
    d->aperture->setDefaultValue(1.1);

    d->distance         = new DDoubleNumInput(this);
    d->distance->setDecimals(1);
    d->distance->setRange(0.0, 10000.0, 0.1);
    d->distance->setDefaultValue(0.0);

    grid->addWidget(hbox,          0, 0, 1, 3);
    grid->addWidget(hbox1,         1, 0, 1, 3);
    grid->addWidget(d->make,       2, 0, 1, 3);
    grid->addWidget(hbox2,         3, 0, 1, 3);
    grid->addWidget(d->model,      4, 0, 1, 3);
    grid->addWidget(hbox3,         5, 0, 1, 3);
    grid->addWidget(d->lens,       6, 0, 1, 3);
    grid->addWidget(d->focalLabel, 7, 0, 1, 1);
    grid->addWidget(d->focal,      7, 1, 1, 2);
    grid->addWidget(d->aperLabel,  8, 0, 1, 1);
    grid->addWidget(d->aperture,   8, 1, 1, 2);
    grid->addWidget(d->distLabel,  9, 0, 1, 1);
    grid->addWidget(d->distance,   9, 1, 1, 2);
    grid->setSpacing(QApplication::style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing));
    grid->setContentsMargins(QMargins());

    connect(d->metadataUsage, SIGNAL(toggled(bool)),
            this, SLOT(slotUseMetadata(bool)));

    connect(d->make, SIGNAL(currentIndexChanged(int)),
            this, SLOT(slotMakeSelected()));

    connect(d->model, SIGNAL(currentIndexChanged(int)),
            this, SLOT(slotModelChanged()));

    connect(d->lens, SIGNAL(currentIndexChanged(int)),
            this, SLOT(slotLensSelected()));

    connect(d->focal, SIGNAL(valueChanged(double)),
            this, SLOT(slotFocalChanged()));

    connect(d->aperture, SIGNAL(valueChanged(double)),
            this, SLOT(slotApertureChanged()));

    connect(d->distance, SIGNAL(valueChanged(double)),
            this, SLOT(slotDistanceChanged()));

    populateDeviceCombos();
    populateLensCombo();
}

LensFunCameraSelector::~LensFunCameraSelector()
{
    delete d->iface;
    delete d;
}

LensFunIface* LensFunCameraSelector::iface() const
{
    return d->iface;
}

LensFunContainer LensFunCameraSelector::settings()
{
    // Update settings in LensFun interface

    blockSignals(true);

    slotModelSelected();
    slotLensSelected();
    slotFocalChanged();
    slotApertureChanged();
    slotDistanceChanged();

    blockSignals(false);

    return d->iface->settings();
}

void LensFunCameraSelector::setSettings(const LensFunContainer& settings)
{
    blockSignals(true);

    d->iface->setSettings(settings);
    refreshSettingsView();

    blockSignals(false);
}

void LensFunCameraSelector::resetToDefault()
{
    setUseMetadata(true);
}

void LensFunCameraSelector::readSettings(KConfigGroup& group)
{
    setUseMetadata(group.readEntry(d->configUseMetadata, true));

    if (!useMetadata())
    {
        LensFunContainer settings = d->iface->settings();
        settings.cameraModel = group.readEntry(d->configCameraModel, QString());
        settings.cameraMake  = group.readEntry(d->configCameraMake,  QString());
        settings.lensModel   = group.readEntry(d->configLensModel,   QString());

        if (settings.subjectDistance <= 0.0)
        {
            settings.subjectDistance = group.readEntry(d->configSubjectDistance, -1.0);
        }

        if (settings.focalLength <= 0.0)
        {
            settings.focalLength = group.readEntry(d->configFocalLength, -1.0);
        }

        settings.cropFactor = group.readEntry(d->configCropFactor, -1.0);

        if (settings.aperture <= 0.0)
        {
            settings.aperture = group.readEntry(d->configAperture, -1.0);
        }

        setSettings(settings);
    }

    slotUseMetadata(useMetadata());
}

void LensFunCameraSelector::writeSettings(KConfigGroup& group)
{
    group.writeEntry(d->configUseMetadata,     useMetadata());
    group.writeEntry(d->configCameraModel,     d->iface->settings().cameraModel);
    group.writeEntry(d->configCameraMake,      d->iface->settings().cameraMake);
    group.writeEntry(d->configLensModel,       d->iface->settings().lensModel);
    group.writeEntry(d->configSubjectDistance, d->iface->settings().subjectDistance);
    group.writeEntry(d->configFocalLength,     d->iface->settings().focalLength);
    group.writeEntry(d->configCropFactor,      d->iface->settings().cropFactor);
    group.writeEntry(d->configAperture,        d->iface->settings().aperture);
}

void LensFunCameraSelector::setMetadata(const DMetadata& meta)
{
    d->metadata = meta;

    if (d->metadata.isEmpty())
    {
        d->metadataUsage->setCheckState(Qt::Unchecked);
        setEnabledUseMetadata(false);
    }
    else
    {
        setEnabledUseMetadata(true);
        findFromMetadata();
    }
}

void LensFunCameraSelector::setEnabledUseMetadata(bool b)
{
    d->metadataUsage->setEnabled(b);
}

void LensFunCameraSelector::setUseMetadata(bool b)
{
    d->metadataUsage->setChecked(b);
}

bool LensFunCameraSelector::useMetadata() const
{
    return (d->metadataUsage->isChecked());
}

void LensFunCameraSelector::setPassiveMetadataUsage(bool b)
{
    d->passiveMetadataUsage = b;
}

void LensFunCameraSelector::slotUseMetadata(bool b)
{
    d->makeDescription->setAdjustedText();
    d->modelDescription->setAdjustedText();
    d->lensDescription->setAdjustedText();
    d->metadataResult->clear();
    d->makeLabel->setStyleSheet(qApp->styleSheet());
    d->modelLabel->setStyleSheet(qApp->styleSheet());
    d->lensLabel->setStyleSheet(qApp->styleSheet());
    d->focalLabel->setStyleSheet(qApp->styleSheet());
    d->aperLabel->setStyleSheet(qApp->styleSheet());
    d->distLabel->setStyleSheet(qApp->styleSheet());
    d->make->setEnabled(true);
    d->model->setEnabled(true);
    d->lens->setEnabled(true);
    d->focal->setEnabled(true);
    d->aperture->setEnabled(true);
    d->distance->setEnabled(true);

    if (b)
    {
        if (d->passiveMetadataUsage)
        {
            d->make->setEnabled(false);
            d->model->setEnabled(false);
            d->lens->setEnabled(false);
            d->focal->setEnabled(false);
            d->aperture->setEnabled(false);
            d->distance->setEnabled(false);
            emit signalLensSettingsChanged();
        }
        else
        {
            LensFunIface::MetadataMatch ret = findFromMetadata();

            switch (ret)
            {
                case LensFunIface::MetadataUnavailable:
                    d->metadataResult->setText(i18n("(no metadata available)"));
                    d->metadataResult->setStyleSheet(d->redStyle);
                    break;

                case LensFunIface::MetadataNoMatch:
                    d->metadataResult->setText(i18n("(no match found)"));
                    d->metadataResult->setStyleSheet(d->redStyle);
                    break;

                case LensFunIface::MetadataPartialMatch:
                    d->metadataResult->setText(i18n("(partial match found)"));
                    d->metadataResult->setStyleSheet(d->orangeStyle);
                    break;

                default:
                    d->metadataResult->setText(i18n("(exact match found)"));
                    d->metadataResult->setStyleSheet(d->greenStyle);
                    break;
            }
        }
    }
}

LensFunIface::MetadataMatch LensFunCameraSelector::findFromMetadata()
{
    LensFunIface::MetadataMatch ret = d->iface->findFromMetadata(d->metadata);
    refreshSettingsView();
    slotModelSelected();
    slotLensSelected();
    return ret;
}

void LensFunCameraSelector::refreshSettingsView()
{
    d->make->blockSignals(true);
    d->model->blockSignals(true);
    d->lens->blockSignals(true);

    d->makeLabel->setStyleSheet(qApp->styleSheet());
    d->modelLabel->setStyleSheet(qApp->styleSheet());
    d->lensLabel->setStyleSheet(qApp->styleSheet());
    d->focalLabel->setStyleSheet(qApp->styleSheet());
    d->aperLabel->setStyleSheet(qApp->styleSheet());
    d->distLabel->setStyleSheet(qApp->styleSheet());

    if (!d->passiveMetadataUsage)
    {
        d->makeDescription->setAdjustedText(QString::fromLatin1("<i>%1</i>").arg(d->iface->makeDescription()));
    }

    int makerIdx = -1;

    if (d->iface->usedCamera())
    {
        makerIdx = d->make->combo()->findText(d->iface->settings().cameraMake);
        qCDebug(DIGIKAM_DIMG_LOG) << "makerIdx: " << makerIdx << " (" << d->iface->settings().cameraMake << ")";
    }
    else
    {
        int i = d->make->combo()->findText(d->iface->makeDescription());

        if (i == -1)
        {
            i = d->make->combo()->findText(QLatin1String("Generic"));
        }

        if (i >= 0)
        {
            d->make->setCurrentIndex(i);
            populateDeviceCombos();
        }

        if (!d->passiveMetadataUsage)
        {
            d->makeLabel->setStyleSheet(d->orangeStyle);
        }
    }

    if (makerIdx >= 0)
    {
        d->make->setCurrentIndex(makerIdx);
        d->make->setEnabled(d->passiveMetadataUsage);

        if (!d->passiveMetadataUsage)
        {
            d->makeLabel->setStyleSheet(d->greenStyle);
        }

        populateDeviceCombos();
    }

    // ------------------------------------------------------------------------------------------------

    if (!d->passiveMetadataUsage)
    {
        d->modelDescription->setAdjustedText(QString::fromLatin1("<i>%1</i>").arg(d->iface->modelDescription()));
    }

    int modelIdx = -1;

    if (d->iface->usedCamera())
    {
        modelIdx = d->model->combo()->findText(d->iface->settings().cameraModel);
        qCDebug(DIGIKAM_DIMG_LOG) << "modelIdx: " << modelIdx << " (" << d->iface->settings().cameraModel << ")";
    }

    if (modelIdx >= 0)
    {
        d->model->setCurrentIndex(modelIdx);
        d->model->setEnabled(d->passiveMetadataUsage);

        if (!d->passiveMetadataUsage)
        {
            d->modelLabel->setStyleSheet(d->greenStyle);
        }

        populateLensCombo();
    }
    else
    {
        if (!d->passiveMetadataUsage)
        {
            d->modelLabel->setStyleSheet(d->orangeStyle);
        }
    }

    // ------------------------------------------------------------------------------------------------

    if (!d->passiveMetadataUsage)
    {
        d->lensDescription->setAdjustedText(QString::fromLatin1("<i>%1</i>").arg(d->iface->lensDescription()));
    }

    int lensIdx = -1;

    if (d->iface->usedLens())
    {
        lensIdx = d->lens->combo()->findText(d->iface->settings().lensModel);
        qCDebug(DIGIKAM_DIMG_LOG) << "lensIdx: " << lensIdx << " (" << d->iface->settings().lensModel << ")";
    }

    if (lensIdx >= 0)
    {
        // found lens model directly, best case :)
        d->lens->setCurrentIndex(lensIdx);
        d->lens->setEnabled(d->passiveMetadataUsage);

        if (!d->passiveMetadataUsage)
        {
            d->lensLabel->setStyleSheet(d->greenStyle);
        }
    }
    else
    {
        if (!d->passiveMetadataUsage)
        {
            d->lensLabel->setStyleSheet(d->orangeStyle);
        }
    }

    // ------------------------------------------------------------------------------------------------

    if (d->iface->settings().focalLength != -1.0)
    {
        d->focal->setValue(d->iface->settings().focalLength);
        d->focal->setEnabled(d->passiveMetadataUsage);

        if (!d->passiveMetadataUsage)
        {
            d->focalLabel->setStyleSheet(d->greenStyle);
        }
    }
    else
    {
        if (!d->passiveMetadataUsage)
        {
            d->focalLabel->setStyleSheet(d->orangeStyle);
        }
    }

    if (d->iface->settings().aperture != -1.0)
    {
        d->aperture->setValue(d->iface->settings().aperture);
        d->aperture->setEnabled(d->passiveMetadataUsage);

        if (!d->passiveMetadataUsage)
        {
            d->aperLabel->setStyleSheet(d->greenStyle);
        }
    }
    else
    {
        if (!d->passiveMetadataUsage)
        {
            d->aperLabel->setStyleSheet(d->orangeStyle);
        }
    }

    if (d->iface->settings().subjectDistance != -1.0)
    {
        d->distance->setValue(d->iface->settings().subjectDistance);
        d->distance->setEnabled(d->passiveMetadataUsage);

        if (!d->passiveMetadataUsage)
        {
            d->distLabel->setStyleSheet(d->greenStyle);
        }
    }
    else
    {
        if (!d->passiveMetadataUsage)
        {
            d->distLabel->setStyleSheet(d->orangeStyle);
        }
    }

    d->make->blockSignals(false);
    d->model->blockSignals(false);
    d->lens->blockSignals(false);
}

void LensFunCameraSelector::populateDeviceCombos()
{
    d->make->blockSignals(true);
    d->model->blockSignals(true);

    const lfCamera* const* it = d->iface->lensFunCameras();

    // reset box
    d->model->combo()->clear();

    bool firstRun = false;

    if (d->make->combo()->count() == 0)
    {
        firstRun = true;
    }

    while (*it)
    {
        if (firstRun)
        {
            // Maker DB does not change, so we fill it only once.
            if ((*it)->Maker)
            {
                QString t = QString::fromLatin1((*it)->Maker);

                if (d->make->combo()->findText(t, Qt::MatchExactly) < 0)
                {
                    d->make->addItem(t);
                }
            }
        }

        // Fill models for current selected maker
        if ((*it)->Model && QString::fromLatin1((*it)->Maker) == d->make->combo()->currentText())
        {
            LensFunIface::DevicePtr dev = *it;
            QVariant b                  = qVariantFromValue(dev);
            d->model->combo()->addItem(QString::fromLatin1(dev->Model), b);
        }

        ++it;
    }

    d->make->combo()->model()->sort(0,  Qt::AscendingOrder);
    d->model->combo()->model()->sort(0, Qt::AscendingOrder);

    d->make->blockSignals(false);
    d->model->blockSignals(false);
}

void LensFunCameraSelector::populateLensCombo()
{
    d->lens->blockSignals(true);
    d->lens->combo()->clear();
    d->lens->blockSignals(false);

    QVariant v = d->model->combo()->itemData(d->model->currentIndex());

    if (!v.isValid() || v.isNull())
    {
        qCDebug(DIGIKAM_DIMG_LOG) << "Invalid variant value for device!";
        return;
    }

    qCDebug(DIGIKAM_DIMG_LOG) << "variant: " << v;

    LensFunIface::DevicePtr dev = v.value<LensFunIface::DevicePtr>();

    if (!dev)
    {
        qCDebug(DIGIKAM_DIMG_LOG) << "Device is null!";
        return;
    }

    qCDebug(DIGIKAM_DIMG_LOG) << "dev: " << dev->Maker << " :: " << dev->Model << " :: " << dev->CropFactor;

    d->lens->blockSignals(true);
    const lfLens** lenses     = d->iface->lensFunDataBase()->FindLenses(dev, 0, 0);
    LensFunContainer settings = d->iface->settings();
    settings.cropFactor       = dev ? dev->CropFactor : -1.0;
    d->iface->setSettings(settings);

    while (lenses && *lenses)
    {
        LensFunIface::LensPtr lens = *lenses;
        QVariant b                 = qVariantFromValue(lens);
        d->lens->combo()->addItem(QString::fromLatin1(lens->Model), b);
        ++lenses;
    }

    d->lens->combo()->model()->sort(0, Qt::AscendingOrder);
    d->lens->blockSignals(false);
}

void LensFunCameraSelector::slotMakeSelected()
{
    populateDeviceCombos();
    slotModelSelected();

    // Fill Lens list for current Maker & Model and fire signalLensSettingsChanged()
    populateLensCombo();
    slotLensSelected();
}

void LensFunCameraSelector::slotModelChanged()
{
    populateLensCombo();
    slotModelSelected();
}

void LensFunCameraSelector::slotModelSelected()
{
    QVariant v = d->model->combo()->itemData(d->model->currentIndex());
    d->iface->setUsedCamera(d->metadataUsage->isChecked() && d->passiveMetadataUsage ? 0 :
                            v.value<LensFunIface::DevicePtr>());
    emit signalLensSettingsChanged();
}

void LensFunCameraSelector::slotLensSelected()
{
    QVariant v = d->lens->combo()->itemData(d->lens->currentIndex());
    d->iface->setUsedLens(d->metadataUsage->isChecked() && d->passiveMetadataUsage ? 0 :
                          v.value<LensFunIface::LensPtr>());

    LensFunContainer settings = d->iface->settings();

    if (d->iface->usedLens() &&
        settings.cropFactor <= 0.0) // this should not happen
    {
        qCDebug(DIGIKAM_DIMG_LOG) << "No crop factor is set for camera, using lens calibration data: " << d->iface->usedLens()->CropFactor;
        settings.cropFactor = d->iface->usedLens()->CropFactor;
    }

    d->iface->setSettings(settings);
    emit signalLensSettingsChanged();
}

void LensFunCameraSelector::slotFocalChanged()
{
    LensFunContainer settings = d->iface->settings();
    settings.focalLength = d->metadataUsage->isChecked() && d->passiveMetadataUsage ? -1.0 :
                           d->focal->value();
    d->iface->setSettings(settings);
    emit signalLensSettingsChanged();
}

void LensFunCameraSelector::slotApertureChanged()
{
    LensFunContainer settings = d->iface->settings();
    settings.aperture = d->metadataUsage->isChecked() && d->passiveMetadataUsage ? -1.0 :
                        d->aperture->value();
    d->iface->setSettings(settings);
    emit signalLensSettingsChanged();
}

void LensFunCameraSelector::slotDistanceChanged()
{
    LensFunContainer settings = d->iface->settings();
    settings.subjectDistance  = d->metadataUsage->isChecked() && d->passiveMetadataUsage ? -1.0 :
                                d->distance->value();
    d->iface->setSettings(settings);
    emit signalLensSettingsChanged();
}

}  // namespace Digikam
