validate method

@override bool validate(T 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(T value, Map<String, FormFieldState> fields) {
  var requiredConditionFulfilled = false;

  if (condition != null) {
    requiredConditionFulfilled = condition!();
  } else if (fields[otherFieldName!]?.value == equalTo) {
    requiredConditionFulfilled = true;
  }

  if (requiredConditionFulfilled) {
    if (value is String) {
      return value.isNotEmpty;
    } else if (value is List) {
      return value.isNotEmpty;
    } else {
      return value != null;
    }
  }

  return true;
}