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Editorial Team
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Asked: 2026-05-28T01:54:39+00:00

I want to connect a QSlider to a QDoubleSpinBox but while the code compiles

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I want to connect a QSlider to a QDoubleSpinBox but while the code compiles fine and runs for simple QSpinBox, it doesn’t work for QDoubleSpinBox

QSlider *horizontalSlider1 = new QSlider();
QDoubleSpinBox *spinBox1 = new QDoubleSpinBox();

connect(spinBox1, SIGNAL(valueChanged(double)),horizontalSlider1,SLOT(setValue(double)) );
connect(horizontalSlider1,SIGNAL(valueChanged(double)),spinBox1,SLOT(setValue(double)) );
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1 Answer

  1. Editorial Team

    QSlider and QDoubleSpinBox take different types of arguments in valueChanged/setValue (QSlider uses ints and QDoubleSpinBox uses doubles, of course). Changing the argument type for the slider’s signal and slot might help:

    connect(spinBox1, SIGNAL(valueChanged(double)),horizontalSlider1,SLOT(setValue(int)) );
connect(horizontalSlider1,SIGNAL(valueChanged(int)),spinBox1,SLOT(setValue(double)) );

    I’m not sure if Qt can automatically handle this type conversion for you; if not, you’ll have to define your own slots to call setValue() on the correct object

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