Qdoublevalidator does not take effect solution

problem ：
Use QIntValidator normal , Replace with QDoubleValidator It will not take effect after , Look at what is said on the Internet to increase this line ：setNotation(QDoubleValidator::StandardNotation);
It doesn't seem to work , I had to write one myself , At present, the test feels OK .

terms of settlement ：
heavy load QDoubleValidator.

class MyDoublevalidator : public QDoubleValidator
{
    
    Q_OBJECT
public:
    MyDoublevalidator(QObject *parent = nullptr);

    QValidator::State validate(QString &str, int &i) const;
};

MyDoublevalidator::MyDoublevalidator(QObject *parent)
{
    
}

QValidator::State MyDoublevalidator::validate(QString &str,int &i) const
{
    
    qDebug() << "validate in: str" << str;

    if(str == "-" || str == ""){
    
        return Intermediate;
    }

    bool ok;
    double number = str.toDouble(&ok);

    if(!ok){
    
        return Invalid;
    }

    //  Judge the decimal point 
    int dotPos = str.indexOf('.');
    if( (dotPos != -1) && (str.length()-dotPos - 1 > decimals()) ){
    
        return Invalid;
    }

    //  Distinguish between negative and positive numbers 
    if(number >= 0)
    {
    
        if(number < bottom()){
    
            return Intermediate;
        }

        if(number > top()){
    
            return Invalid;
        }
    }
    else
    {
     //  negative 
        if(number < bottom()){
    
            return Invalid;
        }

        if(number > top()){
    
            return Intermediate;
        }
    }

    return  Acceptable;
}