实现目的

使用QSpinBox、QDoubleSpinBox 实现数量*单价，float结果显示

使用QSpinBox、QDoubleSpinBox 实现进制的转换

拟实现界面

布局

垂直布局、groupBox中为栅格布局

控件进制设置属性 displayIntegerBase

16代表16进制

#include "spinboxexample.h"
#include "ui_spinboxexample.h"

SpinBoxExample::SpinBoxExample(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::SpinBoxExample)
{
    ui->setupUi(this);
}

SpinBoxExample::~SpinBoxExample()
{
    delete ui;
}

void SpinBoxExample::on_btnCalc_clicked()
{
    int num = ui->spinNum->value();
    float price =ui->spinPrice->value();
    float total = num *price;
    ui->spinTotal->setValue(total);
}


void SpinBoxExample::on_spinNum_valueChanged(int arg1)
{
    int num = arg1;
    float price =ui->spinPrice->value();
    float total = num* price;
    ui->spinTotal->setValue(total);
}


void SpinBoxExample::on_spinPrice_valueChanged(double arg1)
{
    int num = ui->spinNum->value();
    float total = num *arg1;
    ui->spinTotal->setValue(total);
}


void SpinBoxExample::on_spinDec_valueChanged(int arg1)
{
    ui->spinBin->setValue(arg1);
    ui->spinHex->setValue(arg1);
}


void SpinBoxExample::on_spinBin_valueChanged(int arg1)
{
     ui->spinDec->setValue(arg1); //界面已经设置了 进制显示
    ui->spinHex->setValue(arg1);
}


void SpinBoxExample::on_spinHex_valueChanged(int arg1)
{
    ui->spinDec->setValue(arg1);
    ui->spinBin->setValue(arg1);

}

SpinBox

value()读取value值；setValue(value)设置值

结果