BriskBard, CEF4Delphi, WebView4Delphi, WebUI4Delphi and WebUI4CSharp

Posted: **Sat Jul 07, 2018 1:30 pm**

Hello! Please take a look to this code:

procedure TMainFrom.IdHTTP_updateWork(ASender: TObject;
  AWorkMode: TWorkMode; AWorkCount: Int64);
  var download_percent:integer;
begin
  download_percent:=round(AWorkCount * 100 / update_file_size);
  Chromium1.browser.MainFrame.ExecuteJavaScript
  ('$(".progress").progress({percent: '+inttostr(download_percent)+'});',
  'about:blank', 0);
end;

The idea is to use JavaScript to show the progress of file download on the page loaded in Chromium. Everything works fine, but Chromium freezes while file is loaded, and only draws progress after the download is complete. Is there any analogue of Application.ProcessMessages for Chromium?

Posted: **Sat Jul 07, 2018 2:17 pm**

The answer from Remy Lebeau in stackoverflow is the best way to use TIdHTTP without blocking the user interface.
https://stackoverflow.com/questions/512 ... n-cef-work

Create a thread and use TIdHTTP in that thread. In addition to that I would also suggest that you only update the progress bar once every second or 500ms.

Posted: **Sat Jul 07, 2018 2:29 pm**

TChromium can also be used to download files with TChromium.StartDownload and it will download the file in the background without blocking the user interface.

The MiniBrowser demo has all the code to download files. It uses the TChromium.OnDownloadUpdated event to show the download progress information in the status bar.

Posted: **Sat Jul 07, 2018 9:12 pm**

Hi Salvador,

yes, threads is not suits me, but OnDownloadUpdated is pretty fine to me. Thank you!

BriskBard, CEF4Delphi, WebView4Delphi, WebUI4Delphi and WebUI4CSharp

TIdHTTP freeze on CEF4Old work

TIdHTTP freeze on CEF4Old work

Re: TIdHTTP freeze on CEF4Old work

Re: TIdHTTP freeze on CEF4Old work

Re: TIdHTTP freeze on CEF4Old work