QT5笔记： 14. SpinBox的常用功能

• 例子：

#include "widget.h"
#include "ui_widget.h"

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

    connect(ui->spinBoxNumber, SIGNAL(valueChanged(int)), this, SLOT(on_spinBox_valueChanged(int)));
    connect(ui->doubleSpinBoxPrice, SIGNAL(valueChanged(double)), this, SLOT(on_spinBoxDouble_valueChanged(double)));
}

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


void Widget::on_spinBox_valueChanged(int arg1)
{
    double price = ui->doubleSpinBoxPrice->value();
    double total = arg1 * price;
    ui->doubleSpinBoxTotal->setValue(total);
}

void Widget::on_spinBoxDouble_valueChanged(double arg1)
{
    int number = ui->spinBoxNumber->value();
    double total = number * arg1;
    ui->doubleSpinBoxTotal->setValue(total);
}

/**
 * @brief Widget::on_btnConvert_clicked
 * @note SpinBox有属性，来显示进制，当设置十进制的数，他会对应转换为要显示的进制，但是他的value值是十进制数
 */
void Widget::on_btnConvert_clicked()
{
    int dec = ui->spinBoxDec->value();
    ui->spinBoxBin->setValue(dec);
    ui->spinBoxHex->setValue(dec);
}

void Widget::on_btnConvertBin_clicked()
{
    int bin = ui->spinBoxBin->value();
    ui->spinBoxDec->setValue(bin);
    ui->spinBoxHex->setValue(bin);
}

void Widget::on_btnConvertHex_clicked()
{
    int hex = ui->spinBoxHex->value();
    ui->spinBoxBin->setValue(hex);
    ui->spinBoxDec->setValue(hex);
}

• 界面：