Q:

How can I change the step size of QTimeEdit?

QSpinBox has a singleStep property which determines how much the value changes when the step up/down buttons are pressed. I am looking for an analogous behaviour in QTimeEdit
auto t = new QTimeEdit ();
t->setDisplayFormat ("m:ss.zzz");
t->setTime ({0,0,1,234});

If I press the up/down arrows on this widget, the time changes by 1 minute at a time. I want to step by e.g. 100ms instead.
How?

A:

If you want to change the step you must overwrite the stepBy() method.
In the next part I change the step to 100ms if the current section is MSecSection, in the other sections the default step is maintained:
#include <QtWidgets>

class TimeEdit: public QTimeEdit
{
public:
    using QTimeEdit::QTimeEdit;
    void stepBy(int steps) override{
        if(currentSection() == MSecSection){
            setTime(time().addMSecs(steps*100));
            return;
        }
        QTimeEdit::stepBy(steps);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    TimeEdit t;
    t.setDisplayFormat ("m:ss.zzz");
    t.setTime ({0,0,1,234});
    t.show();
    return a.exec();
}

The next example is if you want the step of 100 ms for any section:
#include <QtWidgets>

class TimeEdit: public QTimeEdit
{
public:
    using QTimeEdit::QTimeEdit;
    void stepBy(int steps) override{
        setTime(time().addMSecs(steps*100));
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    TimeEdit t;
    t.setDisplayFormat ("m:ss.zzz");
    t.setTime ({0,0,1,234});
    t.show();
    return a.exec();
}

