downloadwidget.cpp Example File

webenginewidgets/simplebrowser/downloadwidget.cpp
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 #include "downloadwidget.h"

 #include <QFileInfo>
 #include <QUrl>
 #include <QWebEngineDownloadItem>

 DownloadWidget::DownloadWidget(QWebEngineDownloadItem *download, QWidget *parent)
     : QFrame(parent)
     , m_download(download)
     , m_timeAdded(QTime::currentTime())
 {
     setupUi(this);
     m_dstName->setText(QFileInfo(m_download->path()).fileName());
     m_srcUrl->setText(m_download->url().toDisplayString());

     connect(m_cancelButton, &QPushButton::clicked,
             [this](bool) {
         if (m_download->state() == QWebEngineDownloadItem::DownloadInProgress)
             m_download->cancel();
         else
             emit removeClicked(this);
     });

     connect(m_download, &QWebEngineDownloadItem::downloadProgress,
             this, &DownloadWidget::updateWidget);

     connect(m_download, &QWebEngineDownloadItem::stateChanged,
             this, &DownloadWidget::updateWidget);

     updateWidget();
 }

 inline QString DownloadWidget::withUnit(qreal bytes)
 {
     if (bytes < (1 << 10))
         return tr("%L1 B").arg(bytes);
     else if (bytes < (1 << 20))
         return tr("%L1 KiB").arg(bytes / (1 << 10), 0, 'f', 2);
     else if (bytes < (1 << 30))
         return tr("%L1 MiB").arg(bytes / (1 << 20), 0, 'f', 2);
     else
         return tr("%L1 GiB").arg(bytes / (1 << 30), 0, 'f', 2);
 }

 void DownloadWidget::updateWidget()
 {
     qreal totalBytes = m_download->totalBytes();
     qreal receivedBytes = m_download->receivedBytes();
     qreal bytesPerSecond = receivedBytes / m_timeAdded.elapsed() * 1000;

     auto state = m_download->state();
     switch (state) {
     case QWebEngineDownloadItem::DownloadRequested:
         Q_UNREACHABLE();
         break;
     case QWebEngineDownloadItem::DownloadInProgress:
         if (totalBytes >= 0) {
             m_progressBar->setValue(qRound(100 * receivedBytes / totalBytes));
             m_progressBar->setDisabled(false);
             m_progressBar->setFormat(
                 tr("%p% - %1 of %2 downloaded - %3/s")
                 .arg(withUnit(receivedBytes))
                 .arg(withUnit(totalBytes))
                 .arg(withUnit(bytesPerSecond)));
         } else {
             m_progressBar->setValue(0);
             m_progressBar->setDisabled(false);
             m_progressBar->setFormat(
                 tr("unknown size - %1 downloaded - %2/s")
                 .arg(withUnit(receivedBytes))
                 .arg(withUnit(bytesPerSecond)));
         }
         break;
     case QWebEngineDownloadItem::DownloadCompleted:
         m_progressBar->setValue(100);
         m_progressBar->setDisabled(true);
         m_progressBar->setFormat(
             tr("completed - %1 downloaded - %2/s")
             .arg(withUnit(receivedBytes))
             .arg(withUnit(bytesPerSecond)));
         break;
     case QWebEngineDownloadItem::DownloadCancelled:
         m_progressBar->setValue(0);
         m_progressBar->setDisabled(true);
         m_progressBar->setFormat(
             tr("cancelled - %1 downloaded - %2/s")
             .arg(withUnit(receivedBytes))
             .arg(withUnit(bytesPerSecond)));
         break;
     case QWebEngineDownloadItem::DownloadInterrupted:
         m_progressBar->setValue(0);
         m_progressBar->setDisabled(true);
         m_progressBar->setFormat(
             tr("interrupted: %1")
             .arg(m_download->interruptReasonString()));
         break;
     }

     if (state == QWebEngineDownloadItem::DownloadInProgress) {
         static QIcon cancelIcon(QStringLiteral(":process-stop.png"));
         m_cancelButton->setIcon(cancelIcon);
         m_cancelButton->setToolTip(tr("Stop downloading"));
     } else {
         static QIcon removeIcon(QStringLiteral(":edit-clear.png"));
         m_cancelButton->setIcon(removeIcon);
         m_cancelButton->setToolTip(tr("Remove from list"));
     }
 }