QML Textinput inputmask with multiple mask guards

Question

Is there a way to make TextInput inputMask guard multiple conditions? For example:

inputMask: ("9999" || "9999-9999") // syntax probably wrong

Accepted inputs:

1234
1234-3456

Edit: the right hand side input (xxxx-rhs) would also have to be greater than the left hand side.

You could use a validator for allowing multiple varying inputs. The comparison of the LHS and RHS though isn't doable with regexp I suppose. You probably need to write a custom QValidator to make this work. — iam_peter
– iam_peter, Commented Jun 10, 2022 at 12:27

iam_peter · Accepted Answer · 2022-06-10 14:33:41Z

The validate implementation is probably not the most efficient or readable, but it does the job. Have a look at this GitHub repository custom validator.

QValidator::State SpecialValidator::validate(QString &input, int &pos) const
{
    if (input.isEmpty())
        return QValidator::Acceptable;

    static QRegularExpression expression("^\\d{0,4}$");
    QRegularExpressionMatch expressionMatch = expression.match(input);

    if (expressionMatch.hasMatch()) {
        if (expressionMatch.captured(0).size() != 4)
            return QValidator::Intermediate;

        return QValidator::Acceptable;
    }

    static QRegularExpression advancedExpression("^(\\d{4})-(\\d{0,4})$");
    QRegularExpressionMatch advancedExpressionMatch = advancedExpression.match(input);

    if (advancedExpressionMatch.hasMatch()) {
        QString lhs = advancedExpressionMatch.captured(1);
        const QString rhs = advancedExpressionMatch.captured(2);

        if (rhs.isEmpty())
            return QValidator::Intermediate;

        if (rhs.size() == 4)
            return lhs.toInt() < rhs.toInt() ? QValidator::Acceptable : QValidator::Invalid;

        lhs.truncate(rhs.size());

        return lhs.toInt() <= rhs.toInt() ? QValidator::Intermediate : QValidator::Invalid;
    }

    return QValidator::Invalid;
}

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