imagesettings.cpp Example File

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

 #include <QtWidgets/qcombobox.h>
 #include <QtCore/qdebug.h>
 #include <qcameraimagecapture.h>
 #include <qmediaservice.h>

 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()));
     foreach(const QString &codecName, imagecapture->supportedImageCodecs()) {
         QString description = imagecapture->imageCodecDescription(codecName);
         ui->imageCodecBox->addItem(codecName+": "+description, QVariant(codecName));
     }

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

     ui->imageResolutionBox->addItem(tr("Default Resolution"));
     QList<QSize> supportedResolutions = imagecapture->supportedResolutions();
     foreach(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(QtMultimedia::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;
         }
     }
 }