- Qt 5.3
- Qt Multimedia Widgets
- Camera Example
- imagesettings.cpp Example File
- Qt 5.3.2 Reference Documentation

# imagesettings.cpp Example File

camera/imagesettings.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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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;
            }
        }
    }