validate method

@override bool validate(String value, Map<String, FormFieldState> fields)

Validates the given value against the validation rule.

• value: The value to be validated.
• fields: A map of form field states for cross-field validation.

Returns true if the validation passes, false otherwise.

Implementation

@override
bool validate(String value, Map<String, FormFieldState> fields) {
  // Attempt to parse the value as an integer.
  final parsedValue = num.tryParse(value);
  // If parsing fails, the value is invalid.
  if (parsedValue == null) {
    return false;
  }
  return parsedValue <= max;
}