The precision range of double

[wysota]

Hmm... I even told you which method to use to get the desired output... I really don't understand what is so hard there to understand...

QString myDelegate::displayText(const QVariant &val, const QLocale &locale) const {
    if(val.type()==QVariant::Double) return locale.toString(val.toDouble(), 'g', 12); // or QString::number(val.toDouble(), 'g', 12)
    return QStyledItemDelegate::displayText(val, locale);
}

QString myDelegate::displayText(const QVariant &val, const QLocale &locale) const {
    if(val.type()==QVariant::Double) return locale.toString(val.toDouble(), 'g', 12); // or QString::number(val.toDouble(), 'g', 12)
    return QStyledItemDelegate::displayText(val, locale);
}

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