// Handles the file download from a will-download listener attached to a session.
async Task HandleDownload(WillDownloadResult cr, string fileURL)
{
var filename = System.IO.Path.GetFileName(fileURL);
// Set our save path. If it does not exist it will silently be created.
await cr.DownloadItem.SetSavePath($"downloads/{filename}");
// Get the total size of the file to be downloaded so we can calculate
// the percentage progress.
var size = await cr.DownloadItem.GetTotalBytes();
// Listen for the updated event
await cr.DownloadItem.On("updated",
new ScriptObjectCallback <Event, string>(
async(updatedResult) =>
{
var update = updatedResult.CallbackState as object[];
var updateState = update[1].ToString();
// calculate the percentage
var percentage = (await cr.DownloadItem.GetReceivedBytes()) / (float)size;
// Set the progress bar.
await mainWindow.SetProgressBar(percentage, new ProgressBarOptions()
{
Mode = ProgressBarMode.Normal
});
if (updateState == "interrupted")
{
await mainWindow.SetProgressBar(percentage, new ProgressBarOptions()
{
Mode = ProgressBarMode.Error
});
}
else if (updateState == "progressing")
{
if (await cr.DownloadItem.IsPaused())
{
await mainWindow.SetProgressBar(percentage, new ProgressBarOptions()
{
Mode = ProgressBarMode.Paused
});
}
else
{
await mainWindow.SetProgressBar(percentage, new ProgressBarOptions()
{
Mode = ProgressBarMode.Normal
});
}
}
}
)
);
// Listen for when the file is finished downloaded.
await cr.DownloadItem.Once("done",
new ScriptObjectCallback <Event, string>(
async(doneResult) =>
{
var done = doneResult.CallbackState as object[];
var doneState = done[1].ToString();
// check if the download completed and set the progress bar option
// accordingly.
if (doneState == "completed")
{
if (IsWindows)
{
// Flash the frame on windows.
await mainWindow.SetProgressBar(1.0f, new ProgressBarOptions()
{
Mode = ProgressBarMode.None
});
await mainWindow.FlashFrame(true);
}
else
{
// Bounce the doc on Mac.
await mainWindow.SetProgressBar(-1.0f);
var dock = await app.Dock();
await dock.Bounce(DockBounceType.Informational);
await dock.DownloadFinished(fileURL);
}
}
else
{
await mainWindow.SetProgressBar(1.0f, new ProgressBarOptions()
{
Mode = ProgressBarMode.Error
});
}
}
)
);
}