How to construct a doubleSpinBox with default minimum and maximum value

summit

This is the class header file for a doubleSpin box which i am inheriting from QDoubleSpinBox.

currently after creating the box i have to set minimum to 0.0 and maximum value to 9999.0 explicitly
When ever i create DoubleSpinBox thee values should be set automatically.

class SumDoubleBox : public QDoubleSpinBox
{
	Q_OBJECT
public:
	using QDoubleSpinBox::QDoubleSpinBox;  // inherit c'tors
	// re-implement to keep track of default step (optional, could hard-code step in stepBy())
	void setSingleStep(double val);
	// override to adjust step size
	double singleStep() const;

	void stepBy(int steps) override;		

private:
	double m_defaultStep = 1.0;
	double m_CurrentStep;
	bool m_stepUp;
};

mrjj

Hi
Cant you just set the wanted value in the constructor ?

summit

@mrjj can you please show the code line which will set the minimum value for the SpinBox

mrjj

@summit
It would just be in ctor.
setMinimum( 0.0 );
setMaximum(9999.0);

like

 explicit SumDoubleBox(QWidget *parent = nullptr) : QDoubleSpinBox(parent)
    {
        setMinimum(0.0);
        setMaximum(9999.0);
    }

summit

@mrjj Just one more query currently i am inheriting constructors using using QDoubleSpinBox::QDoubleSpinBox; // inherit c'tors

so in this case i would not need this line of code ?

mrjj

@summit
well you dont need that anymore since you provide your own and call the one you normally inherited.

explicit SumDoubleBox(QWidget *parent = nullptr) : QDoubleSpinBox(parent) << call base !
{
setMinimum(0.0);
setMaximum(9999.0);
}

so

class SumDoubleBox : public QDoubleSpinBox
{
    Q_OBJECT
public:
    //using QDoubleSpinBox::QDoubleSpinBox;  // inherit c'tors

    explicit SumDoubleBox(QWidget *parent = nullptr) : QDoubleSpinBox(parent)
    {
        setMinimum(0.0);
        setMaximum(9999.0);
    }
....

summit

@mrjj Thank you very much for your kind help as usual .