start method

Implementation

@override
Future<bool> start({bool refresh = false, String? key}) async
{
  bool ok = true;

  try
  {
    file_picker.FilePicker filepicker = file_picker.FilePicker(allow);

    // fire on start
    if (onstart != null)
    {
      var handler = EventHandler(this);
      ok = await handler.execute(_onstart);
      if (ok == false) return ok;
    }

    File? file = await filepicker.launchPicker(detectors);
    if (file != null)
    {
      if ((this.file != null) && (scope != null) && (scope!.files.containsValue(this.file))) scope!.files.remove(this.file);
      this.file = file;
      await onFile(file);
    }

    // fire on dismissed
    else if (ondismissed != null)
    {
      var handler = EventHandler(this);
     ok = await handler.execute(_ondismissed);
      if (ok == false) return ok;
    }
  }
  catch(e)
  {
    ok = await onFail(Data(), code: 500, message: e.toString());
  }

  return ok;
}