xerobrowser/WebBrowser/DownloadHandler.cs

// Copyright © 2013 The CefSharp Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

using System;
using System.ComponentModel;
using System.IO;
using System.Windows.Forms;
using CefSharp;
using Timer = System.Threading.Timer;
// ReSharper disable NotAccessedField.Local

namespace XeroBrowser
{
    public class DownloadHandler : IDownloadHandler
    {
        public event EventHandler<DownloadItem> OnBeforeDownloadFired;

        public event EventHandler<DownloadItem> OnDownloadUpdatedFired;

        private readonly FrmBrowser _frmref;
        public DownloadHandler(FrmBrowser frm)
        {
            _frmref = frm;
        }

        private readonly DownloadProgress _downloadProgress = new DownloadProgress();
        private DownloadItem _downloadItem;
        public void OnBeforeDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
        {
            OnBeforeDownloadFired?.Invoke(this, downloadItem);

            this._downloadItem = downloadItem;

            try
            {
                _frmref.Invoke((Action)delegate
                {
                    _downloadProgress.Show();
                    _downloadProgress.FormClosing += DownloadProgress_FormClosing;
                });
            }
            catch (ObjectDisposedException){}


            if (!callback.IsDisposed)
            {
                using (callback)
                {
                    callback.Continue(downloadItem.SuggestedFileName, showDialog: true);
                }
            }
        }

        private void DownloadProgress_FormClosing(object sender, FormClosingEventArgs e)
        {
            _downloadItem.IsCancelled = true;
        }

        private Timer _fivesecondtimer;
        public void OnDownloadUpdated(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
        {
            OnDownloadUpdatedFired?.Invoke(this, downloadItem);


            if (downloadItem.IsComplete)
            {
                _fivesecondtimer = new Timer(tcallback, null, 1000 * 5, 1000 * 5);
            }


            _frmref.Invoke((Action)delegate {
                _downloadProgress.ProgressBar1.Value = downloadItem.PercentComplete;
                _downloadProgress.ProgressPrecentage.Text = downloadItem.PercentComplete + @"%  " + (downloadItem.ReceivedBytes / 0x100000) + @"MB / " + (downloadItem.TotalBytes / 0x100000) + @"MB";
                _downloadProgress.ProgressFileName.Text = Path.GetFileName(downloadItem.FullPath);
                _downloadProgress.Update();
                try { } catch (InvalidAsynchronousStateException){}
            });
        }

        private void tcallback(object state)
        { 
           try {
                _frmref.Invoke((Action)delegate
                {
                    _downloadProgress.Close();
                });
           }
           catch (InvalidOperationException){}
        }

        public bool CanDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, string url, string requestMethod)
        {
            throw new NotImplementedException();
        }
    }
}