update method
Implementation
void update({double progress, String message}) {
debugPrint("ProgressDialog message changed: ");
if (_progressDialogType == ProgressDialogType.Download) {
debugPrint("Old Progress: $_progress, New Progress: $progress");
_progress = progress;
}
debugPrint("Old message: $_dialogMessage, New Message: $message");
_dialogMessage = message;
_dialog.update();
}