QDoubleSpinBox->setValue() truncates floats/doubles

[richferrara]

When I call setValue() on a QDoubleSpinBox, the value is truncated to an integer unless the difference between the current value and the new value is less than 1.

Example:
The "decimals" property of the spin box is set to 4.
spin box current value = 50
1st call to setValue(98.42) --> value changes to 98
2nd call to setValue(98.42) --> value changes to 98.42

[Christian Ehrlicher]

Works fine for me with Qt6.7:

#include <QtWidgets>

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    QDoubleSpinBox dbl;
    dbl.setDecimals(4);
    dbl.show();
    dbl.setValue(1.12);
    qDebug() << dbl.value();
    QTimer::singleShot(1000, [&] {
        dbl.setValue(98.42);
        qDebug() << dbl.value();
        });
    QTimer::singleShot(2000, [&] {
        dbl.setValue(98.42);
        qDebug() << dbl.value();
        });
    
    return app.exec();
}

[richferrara]

@Christian-Ehrlicher It works okay for me with Qt 6.6 but not with Qt 5.15. It must have been fixed sometime in between.

[mpergand]

@Christian Ehrlicher's code works as expected for me with Qt 5.15.2

[ChrisW67]

@richferrara ... and for me on 5.15.3 on Linux

[richferrara]

@ChrisW67 I'm using 5.15.2 on Windows 10.

[Christian Ehrlicher]

@richferrara So did you try my testcase? What was printed on the console?

[richferrara]

@Christian-Ehrlicher I get the correct values (1.12, 98.42, 98.42). I don't understand why it's different in my Qt Creator application.