QT第三天

使用QT完成水果计价界面和功能，如下图：

运行结果：

 代码：

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

    void initUi();
public slots:
    void listWidgetFruitItemClickedSlotFun(QListWidgetItem *);
    void totalPriceCountSoltFun(double);
private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

widge.cpp

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

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

    //初始化ui界面
    this->initUi();

    //选中更新价格
    connect(ui->listWidgetFruit, SIGNAL(itemClicked(QListWidgetItem *)),\
            this, SLOT(listWidgetFruitItemClickedSlotFun(QListWidgetItem *)));
    connect(ui->dSpinBoxPrice, SIGNAL(valueChanged(double)), this, SLOT(totalPriceCountSoltFun(double)));
    connect(ui->dSpinBoxWeight, SIGNAL(valueChanged(double)), this, SLOT(totalPriceCountSoltFun(double)));

}

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

void Widget::initUi()
{
    //设置价格初值
    ui->dSpinBoxPrice->setSuffix("元/斤");
    ui->dSpinBoxPrice->setValue(0.0);
    //ui->dSpinBoxPrice->setMinimum(2.2);
    ui->dSpinBoxPrice->setMaximum(30.0);
    ui->dSpinBoxWeight->setSuffix("斤");
    ui->dSpinBoxWeight->setValue(0.0);
    ui->dSpinBoxWeight->setMaximum(50.0);

    ui->dSpinBoxTotalprice->setSuffix("元");
    ui->dSpinBoxTotalprice->setMaximum(1500.0);
    ui->dSpinBoxTotalprice->setValue(ui->dSpinBoxPrice->value() * ui->dSpinBoxWeight->value());

    //添加水果
    QString fruitName[] = {"苹果","香蕉","樱桃","椰子","哈密瓜","水蜜桃"};
    QString fruitIcon[] = {":/ico/Apple.ico",":/ico/Banana.ico",\
                          ":/ico/Cherry.ico",":/ico/Coconut.ico",\
                          ":/ico/Hami_melon.ico",":/ico/Juicy_peach.ico"};

    for (int i = 0;i<6;i++)
    {
        QListWidgetItem *qFruit = new QListWidgetItem();
        qFruit->setText(fruitName[i]);
        qFruit->setIcon(QIcon(fruitIcon[i]));
        ui->listWidgetFruit->addItem(qFruit);
    }

    ui->listWidgetFruit->setViewMode(QListWidget::IconMode);
}

void Widget::listWidgetFruitItemClickedSlotFun(QListWidgetItem *)
{
    //定制价格
    double price[] = {3.2, 2.3, 25.48, 15.0, 3.5, 10.8};
    //获取第几个被选中
    int index = ui->listWidgetFruit->currentRow();
    //更新价格
    ui->dSpinBoxPrice->setValue(price[index]);
}

void Widget::totalPriceCountSoltFun(double)
{
    ui->dSpinBoxTotalprice->setValue(ui->dSpinBoxPrice->value() * ui->dSpinBoxWeight->value());
}