dfl.d

loadDetailsButton.click ~= &loadDetailsButton;

//...

void loadDetailsCallback(Control sender, EventArgs ea)
{
	if(!urlBox.text)
	{
		msgBox("No URL was provided.", "Error", MsgBoxButtons.OK, MsgBoxIcon.INFORMATION);
		urlBox.focus();
		return;
	}
	this.qualityBox.items.add("0 - video/unknown - N/A - N/A");
	qualityBox.invoke(delegate Object(Object[]) {
		loadDetails();
		return null;
	});
}

void loadDetails()
{
	try
	{
		loadDetailsButton.enabled = false;
		auto parser = new Youtube(urlBox.text);
		VideoInfo vid = parser.process();
		titleBox.text = vid.title;
		foreach(q; vid.qualities)
		{
			qualityBox.beginUpdate();
			writeln(q.itag.to!string, ", ", q.type, ", ", q.quality, ", ", q.link);
			qualityBox.addRow(q.itag.to!string, q.type, q.quality, q.link);
			qualityBox.endUpdate();
		}
	}
	catch(Exception e)
	{
		msgBox("Failed to parse the info : " ~ e.msg, "Error", MsgBoxButtons.OK, MsgBoxIcon.ERROR);
	}
	finally
	{
		loadDetailsButton.enabled = true;
	}
}