How to restrict QSpinBox to take more the one Zero ??

kishore_hemmady

Hi,

I have this slot in mainwindow.cpp
void MainWindow::on_blend_valueChanged(int arg1)
{
}
in the UI in the blend field,
A field can allow upto max only one zero and a non zero number cannot be prefixed with a 0. For example : 0,1,2 is allowed ,but not 00,01,002..

how can i do this,please help me.

SGaist

Hi,

From the top of my head:

subclass QSpinBox
Create a QLineEdit
Create a QRegularExpressionValidator with the corresponding expression
Set the validator on the line dit
Set the line edit on the spin box

Out of curiosity, why do you want to limit the number of zeroes ?

kishore_hemmady

thank you @SGaist
I am also thinking the same,but its a useless requirement.
Have to do.

Gojir4

Hello,

I may have misunderstood, but if you want value to be always the same size and prefixed with 0, you can subclass QSpinBox and reimplement textFromValue():

class CustomSpinBox : public QSpinBox
{
    Q_OBJECT
public:
    explicit CustomSpinBox(QWidget *parent = nullptr) : QSpinBox(parent)
    {}

protected:
    virtual QString textFromValue(int val) const
    {
        //Ensure "width" of the field is always 4
        //base 10 (decimal)
        //fill with '0' character
        return QString("%1").arg(val, 4, 10, QChar('0'));
    }
};