qtconnectivity/examples/nfc/ndefeditor/mimeimagerecordeditor.cpp

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#include "mimeimagerecordeditor.h"
#include "ui_mimeimagerecordeditor.h"

#include <QtGui/QImageReader>
#include <QtWidgets/QFileDialog>
#include <QtCore/QBuffer>
#include <QScreen>
#include <QLayout>

#if (defined(Q_OS_ANDROID) && !defined(Q_OS_ANDROID_EMBEDDED)) || defined(Q_OS_IOS)
#    define MOBILE_PLATFORM
#endif

static QString imageFormatToMimeType(const QByteArray &format)
{
    if (format == "bmp")
        return QStringLiteral("image/bmp");
    else if (format == "gif")
        return QStringLiteral("image/gif");
    else if (format == "jpg" || format == "jpeg")
        return QStringLiteral("image/jpeg");
    else if (format == "mng")
        return QStringLiteral("video/x-mng");
    else if (format == "png")
        return QStringLiteral("image/png");
    else if (format == "pbm")
        return QStringLiteral("image/x-portable-bitmap");
    else if (format == "pgm")
        return QStringLiteral("image/x-portable-graymap");
    else if (format == "ppm")
        return QStringLiteral("image/x-portable-pixmap");
    else if (format == "tiff")
        return QStringLiteral("image/tiff");
    else if (format == "xbm")
        return QStringLiteral("image/x-xbitmap");
    else if (format == "xpm")
        return QStringLiteral("image/x-xpixmap");
    else if (format == "svg")
        return QStringLiteral("image/svg+xml");
    else
        return QString();
}

MimeImageRecordEditor::MimeImageRecordEditor(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::MimeImageRecordEditor)
{
    ui->setupUi(this);
#ifdef MOBILE_PLATFORM
    connect(screen(), &QScreen::orientationChanged, this,
            &MimeImageRecordEditor::handleScreenOrientationChange);
#endif
}

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

void MimeImageRecordEditor::setRecord(const QNdefRecord &record)
{
    m_record = record;

    QByteArray data = record.payload();
    QBuffer buffer(&data);
    buffer.open(QIODevice::ReadOnly);

    QImageReader reader(&buffer);

    ui->mimeImageType->setText(imageFormatToMimeType(reader.format()));
    ui->mimeImageFile->clear();

    m_pixmap = QPixmap::fromImage(reader.read());
    updatePixmap();
}

QNdefRecord MimeImageRecordEditor::record() const
{
    return m_record;
}

void MimeImageRecordEditor::handleScreenOrientationChange(Qt::ScreenOrientation orientation)
{
    Q_UNUSED(orientation);
#ifdef MOBILE_PLATFORM
    if (m_imageSelected) {
        ui->mimeImageImage->clear();
        adjustSize();
        m_screenRotated = true;
    }
#endif
}

void MimeImageRecordEditor::resizeEvent(QResizeEvent *)
{
    if (m_imageSelected) {
#ifdef MOBILE_PLATFORM
        if (m_screenRotated) {
            updatePixmap();
            m_screenRotated = false;
        }
#else
        updatePixmap();
#endif
    }
}

void MimeImageRecordEditor::updatePixmap()
{
    // Calculate the desired width of the image. It's calculated based on the
    // screen size minus the content margins.
    const auto parentContentMargins = parentWidget()->layout()->contentsMargins();
    const auto thisContentMargins = layout()->contentsMargins();
#ifdef MOBILE_PLATFORM
    // Because of QTBUG-94459 the screen size might be incorrect, so we check
    // the orientation to find the actual width
    const auto w = screen()->availableSize().width();
    const auto h = screen()->availableSize().height();
    const auto screenWidth =
            (screen()->orientation() == Qt::PortraitOrientation) ? qMin(w, h) : qMax(w, h);
#else
    const auto screenWidth = width();
#endif
    const auto imageWidth = screenWidth - parentContentMargins.right() - parentContentMargins.left()
            - thisContentMargins.right() - thisContentMargins.left();

    if (!m_pixmap.isNull()) {
        if (m_pixmap.width() > imageWidth)
            ui->mimeImageImage->setPixmap(m_pixmap.scaledToWidth(imageWidth));
        else
            ui->mimeImageImage->setPixmap(m_pixmap);
    } else {
        ui->mimeImageImage->setText("Can't show the image");
    }
}

void MimeImageRecordEditor::on_mimeImageOpen_clicked()
{
    QString mimeDataFile = QFileDialog::getOpenFileName(this, tr("Select Image File"));
    if (mimeDataFile.isEmpty())
        return;

    QFile imageFile(mimeDataFile);
    if (!imageFile.open(QIODevice::ReadOnly)) {
        ui->mimeImageFile->clear();
        ui->mimeImageImage->clear();
    }

    QByteArray imageData = imageFile.readAll();

    QBuffer buffer(&imageData);
    buffer.open(QIODevice::ReadOnly);

    QImageReader reader(&buffer);
    QString mimeType = imageFormatToMimeType(reader.format());
    ui->mimeImageType->setText(mimeType);

    ui->mimeImageFile->setText(mimeDataFile);
    const QImage image = reader.read();
    m_pixmap = QPixmap::fromImage(image);
    m_imageSelected = true;
    updatePixmap();

    m_record.setTypeNameFormat(QNdefRecord::Mime);
    m_record.setType(mimeType.toLatin1());
    m_record.setPayload(imageData);
}