widget.Text param:validator using a function not takes the current value.

https://github.com/peterbrittain/asciimatics/blob/4d8279a4d1fc095c6ce26b0c4fb5702992f2e268/asciimatics/widgets.py#L1592

#works
#self.text_count = Text(label="Count", validator=lambda x: True if x.isdigit() else False)

#not works
self.text_count = Text(label="Count", validator=self._valid_char)
#_valid_char, not takes any value
@staticmethod
def _valid_char(self, char):
     ...

whitout staticmethod raise an exception: TypeError: first argument must be string or compiled pattern

Is it a error?

Using: C9 IDE Python 3.5.3 (default, Apr 22 2017, 00:00:00) [GCC 4.8.4]

[peterbrittain]

OK! In that case, this is fixed. I’ll close the issue.

Note that your sample code for the instance method will hit a recursion error with this fix because you are setting a new value inside the validator. You don’t need to do this as the value is already set by the widget. The validator should simply check whether the current value is syntactically correct and return True/False accordingly.

[peterbrittain]

Hold on a sec… Do you mean that you can’t use instance methods as your validator function?