UpTool2/UpToolEto/UpToolEto/Forms/DownloadDialog.cs

using System;
using System.Net;
using System.Threading;
using Eto.Drawing;
using Eto.Forms;
using UpToolLib.DataStructures;

namespace UpToolEto.Forms
{
    public class DownloadDialog : Dialog
    {
        private readonly Uri _url;
        private readonly Application _application;
        private readonly IExternalFunctionality _platform;
        public State CurrentState = State.NotStarted;
        public byte[] Download = new byte[0];
        private readonly ProgressBar _bar;
        public DownloadDialog(Uri url, Application application, IExternalFunctionality platform)
        {
            _url = url;
            _application = application;
            _platform = platform;
            Title = "Downloader";
            Resizable = false;
            Maximizable = false;
            Minimizable = false;
            WindowStyle = WindowStyle.Utility;
            _bar = new();
            _bar.MaxValue = 100;
            Content = new StackLayout
            {
                Padding = 10,
                Items =
                {
                    "Downloading " + url,
                    new StackLayoutItem(_bar, HorizontalAlignment.Stretch, true)
                }
            };
            Size = new Size(700, 400);
        }

        public void StartDownload()
        {
            CurrentState = State.Downloading;
            new Thread(() =>
            {
                try
                {
                    WebClient client = new();
                    client.DownloadProgressChanged += (_, args) => _application.Invoke(() =>
                    {
                        _bar.Value = args.ProgressPercentage;
                        _application.RunIteration();
                    });
                    client.DownloadDataCompleted += (_, args) =>
                    {
                        CurrentState = State.Success;
                        Download = args.Result;
                        _application.Invoke(Close);
                    };
                    client.DownloadDataAsync(_url, client);
                }
                catch
                {
                    CurrentState = State.Failed;
                    _application.Invoke(Close);
                }
            }).Start();
        }

        public enum State
        {
            NotStarted,
            Downloading,
            Failed,
            Success
        }
    }
}