UrlSource typedef
UrlSource =
Future<String> Function({BuildContext context, String hint, String label})
A future function that can be used to prompt for a url or image source.
You can use this to show your own dialog and return the prompt value.
Check the function _takeInput for an example.
Implementation
typedef UrlSource = Future<String> Function({
@required BuildContext context,
@required String hint,
@required String label,
});