Qt 5.7 | Qt Multimedia | Camera Example | imagesettings.cpp Example File

Qt 5.7.1 Reference Documentation

# imagesettings.cpp Example File

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()));
          foreach(const QString &codecName, imagecapture->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"));
          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(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;
              }
          }
      }