qt-everywhere-src-5.14.1/qtmultimedia/examples/multimediawidgets/camera/imagesettings.cpp

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#include "imagesettings.h"
#include "ui_imagesettings.h"

#include <QComboBox>
#include <QDebug>
#include <QCameraImageCapture>
#include <QMediaService>


ImageSettings::ImageSettings(QCameraImageCapture *imageCapture, QWidget *parent) :
    QDialog(parent),
    ui(new Ui::ImageSettingsUi),
    imagecapture(imageCapture)
{
    ui->setupUi(this);

    //image codecs
    ui->imageCodecBox->addItem(tr("Default image format"), QVariant(QString()));
    const QStringList supportedImageCodecs = imagecapture->supportedImageCodecs();
    for (const QString &codecName : supportedImageCodecs) {
        QString description = imagecapture->imageCodecDescription(codecName);
        ui->imageCodecBox->addItem(codecName + ": " + description, QVariant(codecName));
    }

    ui->imageQualitySlider->setRange(0, int(QMultimedia::VeryHighQuality));

    ui->imageResolutionBox->addItem(tr("Default Resolution"));
    const QList<QSize> supportedResolutions = imagecapture->supportedResolutions();
    for (const QSize &resolution : supportedResolutions) {
        ui->imageResolutionBox->addItem(QString("%1x%2").arg(resolution.width()).arg(resolution.height()),
                                        QVariant(resolution));
    }
}

ImageSettings::~ImageSettings()
{
    delete ui;
}

void ImageSettings::changeEvent(QEvent *e)
{
    QDialog::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

QImageEncoderSettings ImageSettings::imageSettings() const
{
    QImageEncoderSettings settings = imagecapture->encodingSettings();
    settings.setCodec(boxValue(ui->imageCodecBox).toString());
    settings.setQuality(QMultimedia::EncodingQuality(ui->imageQualitySlider->value()));
    settings.setResolution(boxValue(ui->imageResolutionBox).toSize());

    return settings;
}

void ImageSettings::setImageSettings(const QImageEncoderSettings &imageSettings)
{
    selectComboBoxItem(ui->imageCodecBox, QVariant(imageSettings.codec()));
    selectComboBoxItem(ui->imageResolutionBox, QVariant(imageSettings.resolution()));
    ui->imageQualitySlider->setValue(imageSettings.quality());
}

QVariant ImageSettings::boxValue(const QComboBox *box) const
{
    int idx = box->currentIndex();
    if (idx == -1)
        return QVariant();

    return box->itemData(idx);
}

void ImageSettings::selectComboBoxItem(QComboBox *box, const QVariant &value)
{
    for (int i = 0; i < box->count(); ++i) {
        if (box->itemData(i) == value) {
            box->setCurrentIndex(i);
            break;
        }
    }
}