qt作业day2

m0_582481492025-03-04 17:00

1：在注册登录的练习里面，追加一个QListWidget 项目列表 要求：点击注册之后，将账号显示到 listWidget上面去 以及，在listWidget中双击某个账号的时候，将该账号删除

.h

cpp 复制代码 
#ifndef WIDGET_H
#define WIDGET_H
#include "QFile"
#include <QWidget>
#include <QListWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);

    void save_data(const QString &filename,const QString &data);
    QString load_data(const QString& filename);


    ~Widget();

private slots:
    void on_lineEdit_2_textChanged(const QString &arg1);

    void on_lineEdit_textChanged(const QString &arg1);

    void on_pushButton_3_pressed();

    void on_pushButton_3_released();

    void on_checkBox_stateChanged(int arg1);

    void on_pushButton_clicked();  // 注册按钮点击

    void on_lineEdit_returnPressed();  // 输入框回车

    void myslot_2();  // 信号示例

    void loadAccountInfo();  // 加载账号信息

    void deleteAccount(QListWidgetItem* item);  // 删除账号




private:
    Ui::Widget *ui;
    QFile file;
    QString accountFilePath;  // 账号信息文件路径
    QList<QString> accounts;  // 存储账号信息
};
#endif // WIDGET_H

.cpp

cpp 复制代码 
#include "widget.h"
#include "ui_widget.h"
#include "QFile"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    QString name = load_data("F:/hqyjian/mm.txt");
    ui->lineEdit->setText(name);

    accountFilePath = "F:/hqyjian/mm.txt";

       // 加载账号信息
       loadAccountInfo();

       // 连接信号和槽
       connect(ui->pushButton, &QPushButton::clicked, this, &Widget::on_pushButton_clicked);
       connect(ui->lineEdit_2, &QLineEdit::returnPressed, this, &Widget::on_lineEdit_returnPressed);
       connect(ui->listWidget, &QListWidget::itemDoubleClicked, this, &Widget::deleteAccount);
}

Widget::~Widget()
{
    QString name = ui->lineEdit_2->text();
    QString password = ui->lineEdit->text();
    save_data("F:/hqyjian/mm.txt",name);
    save_data("F:/hqyjian/mm.txt",password);
    delete ui;
}

void Widget::save_data(const QString &filename,const QString &data)
{
    file.setFileName(filename);
    file.open(QFile::WriteOnly);

    file.write(data.toLocal8Bit());
    file.close();
}



QString Widget::load_data(const QString &filename)
{
    file.setFileName(filename);
    file.open(QFile::ReadOnly);
    QByteArray arr = file.readAll();
    QString str = QString::fromLocal8Bit(arr);
    file.close();
    return str;
}

void Widget::on_lineEdit_2_textChanged(const QString &arg1)
{
    QString name = ui->lineEdit->text();
    QString pswd = ui->lineEdit_2->text();
    if(name.isEmpty() || pswd.isEmpty()){
        ui->pushButton->setEnabled(0);
        ui->pushButton_2->setEnabled(0);

    }else{
        ui->pushButton->setEnabled(1);
        ui->pushButton_2->setEnabled(1);
    }
}


void Widget::on_lineEdit_textChanged(const QString &arg1)
{
    QString name = ui->lineEdit->text();
    QString pswd = ui->lineEdit_2->text();
    if(name.isEmpty() || pswd.isEmpty()){
        ui->pushButton->setEnabled(0);
        ui->pushButton_2->setEnabled(0);

    }else{
        ui->pushButton->setEnabled(1);
}
}

void Widget::on_pushButton_3_pressed()
{
    ui->lineEdit->setEchoMode(QLineEdit::Normal);

}

void Widget::on_pushButton_3_released()
{
     ui->lineEdit->setEchoMode(QLineEdit::Password);

}

void Widget::on_checkBox_stateChanged(int arg1)
{


}
void Widget::on_pushButton_clicked()
{
    QString str = ui->lineEdit->text();
    if (!str.isEmpty()) {
        accounts.append(str);
        ui->listWidget->addItem(str);  // 添加到 QListWidget
        ui->textEdit->append(str);  // 添加到 QTextEdit
        ui->lineEdit->clear();
    }
}

void Widget::on_lineEdit_returnPressed()
{
    on_pushButton_clicked();  // 回车键触发注册按钮点击事件
}

void Widget::myslot_2()
{
    ui->textEdit->append("dda");
}

void Widget::loadAccountInfo()
{
    QFile file(accountFilePath);
    if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        QTextStream in(&file);
        while (!in.atEnd()) {
            QString line = in.readLine();
            accounts.append(line);
            ui->listWidget->addItem(line);  // 添加到 QListWidget
            ui->textEdit->append(line);  // 添加到 QTextEdit
        }
        file.close();
    }
}

void Widget::deleteAccount(QListWidgetItem* item)
{
    if (item) {
        QString account = item->text();
        accounts.removeAll(account);
        ui->listWidget->removeItemWidget(item);
        delete item;

        // 保存更新后的账号信息
        QFile file(accountFilePath);
        if (file.open(QIODevice::WriteOnly | QIODevice::Text)) {
            QTextStream out(&file);
            for (const QString& acc : accounts) {
                out << acc << "\n";
            }
            file.close();
        }
    }
}

main.cpp

cpp 复制代码 
#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

2.完成一个计算器，ui界面如下 完成 +-*/计算功能并且在对应位置显示对应的数据

.h

cpp 复制代码 
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include "QString"
#include "QIcon"
#include "math.h"
#include "QPixmap"
#include <QPainter>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    void paintEvent(QPaintEvent *event);
public slots:
    void push_Botton();
    void push_Botton1();
    void push_Botton2();
    void push_Botton3();
    void push_Botton4();
    void push_Botton5();
    void push_Botton6();
    void push_Botton7();
    void push_Botton8();
    void push_Botton9();

    void bnt_add();
    void bnt_sub();
    void bnt_mul();
    void bnt_div();
    void bnt_d();
    void bnt_over();


private slots:

    void on_clear_clicked(bool checked);

    void on_clearall_clicked(bool checked);

    void on_delete_2_clicked(bool checked);

    void on_fenshu_clicked(bool checked);

    void on_pow_clicked(bool checked);

    void on_genhao_clicked(bool checked);

    void on_aors_clicked(bool checked);

    void on_yu_clicked(bool checked);

private:
    Ui::Widget *ui;
    QString symbol = "";
    QString num1 = "";
    QString num2 = "";
    QString over = "";
    QString msg = "";
    bool isSave01 = true;
    bool isSave02 = true;
};

#endif // WIDGET_H

.cpp

cpp 复制代码 
#include "widget.h"
#include "QIcon"
#include "QString"
#include "QDebug"
#include "QLabel"
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setFixedSize(430,550);
    this->setWindowTitle("计算器");
    this->setWindowIcon(QIcon(":/image/computer.webp"));
    //使用setStyleSheet方法设置标签颜色
    ui->label_msg->setStyleSheet("QLabel { color: grey; }");



    connect(ui->add,SIGNAL(clicked(bool)),this,SLOT(bnt_add()));
    connect(ui->div,SIGNAL(clicked(bool)),this,SLOT(bnt_div()));
    connect(ui->sub,SIGNAL(clicked(bool)),this,SLOT(bnt_sub()));
    connect(ui->mul,SIGNAL(clicked(bool)),this,SLOT(bnt_mul()));
    connect(ui->over,SIGNAL(clicked(bool)),this,SLOT(bnt_over()));

    connect(ui->btn_d,SIGNAL(clicked(bool)),this,SLOT(bnt_d()));

    connect(ui->push_Botton_0,SIGNAL(clicked(bool)),this,SLOT(bnt_num0()));
    connect(ui->push_Botton_1,SIGNAL(clicked(bool)),this,SLOT(bnt_num1()));
    connect(ui->push_Botton_2,SIGNAL(clicked(bool)),this,SLOT(bnt_num2()));
    connect(ui->push_Botton_3,SIGNAL(clicked(bool)),this,SLOT(bnt_num3()));
    connect(ui->push_Botton_4,SIGNAL(clicked(bool)),this,SLOT(bnt_num4()));
    connect(ui->push_Botton_5,SIGNAL(clicked(bool)),this,SLOT(bnt_num5()));
    connect(ui->push_Botton_6,SIGNAL(clicked(bool)),this,SLOT(bnt_num6()));
    connect(ui->push_Botton_7,SIGNAL(clicked(bool)),this,SLOT(bnt_num7()));
    connect(ui->push_Botton_8,SIGNAL(clicked(bool)),this,SLOT(bnt_num8()));
    connect(ui->push_Botton_9,SIGNAL(clicked(bool)),this,SLOT(bnt_num9()));

}

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

void Widget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
//    painter.drawPixmap(0,0,width(),height(),QPixmap(":/image/bizhi.jpg"));
}
//数字0代码段
void Widget::bnt_num0()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("0");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("0");
        ui->label_idet->setText(num2);
    }
}
//数字1代码段
void Widget::bnt_num1()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("1");
        ui->label_idet->setText(num1);

    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("1");
        ui->label_idet->setText(num2);
    }
}
//数字2代码段
void Widget::bnt_num2()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("2");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("2");
        ui->label_idet->setText(num2);
    }
}
//数字3代码段
void Widget::bnt_num3()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("3");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("3");
        ui->label_idet->setText(num2);
    }
}
//数字4代码段
void Widget::bnt_num4()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("4");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("4");
        ui->label_idet->setText(num2);
    }
}
//数字5代码段
void Widget::bnt_num5()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("5");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("5");
        ui->label_idet->setText(num2);
    }
}
//数字6代码段
void Widget::bnt_num6()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("6");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("6");
        ui->label_idet->setText(num2);
    }
}
//数字7代码段
void Widget::bnt_num7()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("7");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("7");
        ui->label_idet->setText(num2);
    }
}
//数字8代码段
void Widget::bnt_num8()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("8");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("8");
        ui->label_idet->setText(num2);
    }
}
//数字9代码段
void Widget::bnt_num9()
{
    if(symbol == "")
    {
        if(num1 == "0")
        {
            num1.chop(1);
        }
        num1.append("9");
        ui->label_idet->setText(num1);
    }
    else
    {
        if(num2 == "0")
        {
            num2.chop(1);
        }
        num2.append("9");
        ui->label_idet->setText(num2);
    }
}
//小数点代码段
void Widget::bnt_d()
{
    if(symbol == "")
    {
        num1.append(".");
        ui->label_idet->setText(num1);
    }
    else
    {
        num2.append(".");
        ui->label_idet->setText(num2);
    }
}

//加法
void Widget::bnt_add()
{
    double n1 = num1.toDouble();
    double n2 = num2.toDouble();
    double x = 0.0;
    if(symbol == "+")
    {
        //计算三位以上的式子
        x = n1 + n2;
        num1 = QString::number(x);
        qDebug()<<"x="<<x;
    }
    else if (symbol =="-")
    {
        x = n1 - n2;
        num1 = QString::number(x);
    }
    else if (symbol =="×")
    {
        x = n1 * n2;
        num1 = QString::number(x);
    }
    else if (symbol =="÷")
    {
        x = n1 / n2;
        num1 = QString::number(x);
    }
    else if(symbol == "%")
    {
        if(num1 == "")
        {
            ui->label_msg->setText("0");
        }
        else if(num2 != "")
        {
            num1 = QString::number(x);
        }
    }

    num2 = "";
    msg = "";
    //将式子放入信息栏中
    if(isSave01)
    {
        msg.append(num1);
    }
    symbol = "+";
    msg.append(symbol);
    ui->label_msg->setText(msg);
    isSave01 = true;

}
//减法
void Widget::bnt_sub()
{
    double n1 = num1.toDouble();
    double n2 = num2.toDouble();
    double x = 0.0;
    if(symbol == "-")
    {
        //计算三位以上的式子
        x = n1 - n2;
        num1 = QString::number(x);
        qDebug()<<"x="<<x;
    }
    else if (symbol =="+")
    {
        x = n1 + n2;
        num1 = QString::number(x);
    }
    else if (symbol =="×")
    {
        x = n1 * n2;
        num1 = QString::number(x);
    }
    else if (symbol =="÷")
    {
        x = n1 / n2;
        num1 = QString::number(x);
    }
    else if(symbol == "%")
    {
        if(num1 == "")
        {
            ui->label_msg->setText("0");
        }
        else if(num2 != "")
        {
            num1 = QString::number(x);
        }
    }

    num2 = "";
    msg = "";
    //将式子放入信息栏中
    if(isSave01)
    {
        msg.append(num1);
    }
    symbol = "-";
    msg.append(symbol);
    ui->label_msg->setText(msg);
    isSave01 = true;
}
//乘法
void Widget::bnt_mul()
{
    double n1 = num1.toDouble();
    double n2 = num2.toDouble();
    double x = 0.0;
    if(symbol == "×")
    {
        //计算三位以上的式子
        x = n1 * n2;
        num1 = QString::number(x);
        qDebug()<<"x="<<x;
    }
    else if (symbol =="-")
    {
        x = n1 - n2;
        num1 = QString::number(x);
    }
    else if (symbol =="+")
    {
        x = n1 + n2;
        num1 = QString::number(x);
    }
    else if (symbol =="÷")
    {
        x = n1 / n2;
        num1 = QString::number(x);
    }
    else if(symbol == "%")
    {
        if(num1 == "")
        {
            ui->label_msg->setText("0");
        }
        else if(num2 != "")
        {
            num1 = QString::number(x);
        }
    }
    num2 = "";
    msg = "";
    //将式子放入信息栏中
    if(isSave01)
    {
        msg.append(num1);
    }
    symbol = "×";
    msg.append(symbol);
    ui->label_msg->setText(msg);
    isSave01 = true;

}
//除法
void Widget::bnt_div()
{
    double n1 = num1.toDouble();
    double n2 = num2.toDouble();
    double x = 0.0;
    if(symbol == "÷")
    {
        //计算三位以上的式子
        x = n1 / n2;
        num1 = QString::number(x);
        qDebug()<<"x="<<x;
    }
    else if (symbol =="-")
    {
        x = n1 - n2;
        num1 = QString::number(x);
    }
    else if (symbol =="×")
    {
        x = n1 * n2;
        num1 = QString::number(x);
    }
    else if (symbol =="+")
    {
        x = n1 + n2;
        num1 = QString::number(x);
    }
    else if(symbol == "%")
    {
        if(num1 == "")
        {
            ui->label_msg->setText("0");
        }
        else if(num2 != "")
        {
            x = n1 / n2;
            num1 = QString::number(x);
        }
    }

    num2 = "";
    msg = "";
    //将式子放入信息栏中
    if(isSave01)
    {
        msg.append(num1);
    }
    symbol = "÷";
    msg.append(symbol);
    ui->label_msg->setText(msg);
    isSave01 = true;
}
//等于
void Widget::bnt_over()
{
    if(isSave02)
    {
        msg.append(num2);
    }
    double n1 = num1.toDouble();
    double n2 = num2.toDouble();

    double x = 0;

    if(symbol == "+")
    {
        //计算按下等于之后的结果
        x = n1 + n2;

    }
    else if(symbol == "-")
    {
        x = n1 - n2;
    }
    else if(symbol == "×")
    {
         x = n1 * n2;
    }
    else if(symbol == "÷")
    {
        if (n2 != 0)
        {
            x = n1 / n2;
        }
        else
        {
            ui->label_idet->setText("除数不能为0");
            return;
        }
    }
    else if(symbol == "%")
    {
        //判断num1存在的同时num2也存在
        if(num1 == "")
        {
            ui->label_msg->setText("0");
        }
        else if(num2 != "")
        {
        }
    }
    else if(symbol == "")
    {
        x = n1;
    }
    msg.append("=");
    ui->label_msg->setText(msg);

    QString str = QString::number(x);
    ui->label_idet->setText(str);
    num1 = str;
    num2 = "";
    symbol = "";
    msg = "";
    isSave02 = true;

}

void Widget::on_clear_clicked(bool checked)
{
    //删除最近一项
    if(symbol == "")
    {
        num1 = "";
        ui->label_idet->setText("0");
    }
    else
    {
        num2 = "";
        ui->label_idet->setText("0");
    }

}

void Widget::on_clearall_clicked(bool checked)
{
    //删除所有项
    num1 = "";
    num2 = "";
    symbol = "";
    ui->label_idet->setText("0");
    msg = "";
    ui->label_msg->clear();
}

void Widget::on_delete_2_clicked(bool checked)
{
    //删除一个数字
    if(symbol == "")
    {
        num1.chop(1);
        ui->label_idet->setText(num1);
    }
    else
    {
        num2.chop(1);
        ui->label_idet->setText(num2);
    }
}

void Widget::on_fenshu_clicked(bool checked)
{
     //化为分数
    if(num1 == 0)
    {
        ui->label_idet->setText("分母不能为0");
    }
    else
    {
        if(symbol == "")
        {
            double n1 = num1.toDouble();
            msg.append("1/(");
            msg.append(QString::number(n1));
            msg.append(")");
            ui->label_msg->setText(msg);

            n1 = 1 / num1.toDouble();
            QString str = QString::number(n1);
            num1 = str;
            ui->label_idet->setText(str);
        }
        else
        {
            double n2 = num2.toDouble();
            isSave02=false;
            msg.append("1/(");
            msg.append(QString::number(n2));
            msg.append(")");
            ui->label_msg->setText(msg);

            n2 = sqrt(num2.toDouble());
            qDebug() << "n2:" << n2 << endl;
            QString str = QString::number(n2);
            num2 = str;
            ui->label_idet->setText(str);
        }
    }
}

void Widget::on_pow_clicked(bool checked)
{
    //平方
    if(symbol == "")
    {
        double n1 = num1.toDouble();
        msg.append("sqr(");
        msg.append(QString::number(n1));
        msg.append(")");
        ui->label_msg->setText(msg);

        n1 = num1.toDouble() * num1.toDouble();
        QString str = QString::number(n1);
        num1 = str;
        ui->label_idet->setText(str);
    }
    else
    {
        double n2 = num2.toDouble();
        isSave02=false;
        msg.append("sqr(");
        msg.append(QString::number(n2));
        msg.append(")");
        ui->label_msg->setText(msg);

        n2 = num2.toDouble() * num2.toDouble();
        qDebug() << "n2:" << n2 << endl;
        QString str = QString::number(n2);
        num2 = str;
        ui->label_idet->setText(str);
    }
}

void Widget::on_genhao_clicked(bool checked)
{
    //开根号
    if(symbol == "")
    {
        double n1 = num1.toDouble();
        msg.append("根号(");
        msg.append(QString::number(n1));
        msg.append(")");
        ui->label_msg->setText(msg);

        n1 = sqrt(num1.toDouble());
        QString str = QString::number(n1);
        num1 = str;
        ui->label_idet->setText(str);
    }
    else
    {
        double n2 = num2.toDouble();
        isSave02=false;
        msg.append("根号(");
        msg.append(QString::number(n2));
        msg.append(")");
        ui->label_msg->setText(msg);

        n2 = sqrt(num2.toDouble());
        qDebug() << "n2:" << n2 << endl;
        QString str = QString::number(n2);
        num2 = str;
        ui->label_idet->setText(str);
    }

}

void Widget::on_aors_clicked(bool checked)
{
    //转换正负数
    if(symbol == "")
    {
        double n1 = num1.toDouble();
        n1 = -n1;
        num1 = QString::number(n1);
        ui->label_idet->setText(num1);
        qDebug() << "符号1：" << num1;
    }
    else
    {
        double n2 = num2.toDouble();
        n2 = -n2;
        num2 = QString::number(n2);
        ui->label_idet->setText(num2);
        qDebug() << "符号2：" << num2;
    }
}

void Widget::on_yu_clicked(bool checked)//有问题
{
    //72 + 5% =3.6
    //72的5%是3.6，所以72+3.6就是75.6
    //将式子放入信息栏中
    double n1 = num1.toDouble();
    double n2 = num2.toDouble();
    double x;
    if(num1 != "" && num2 != "")
    {
        n2 = (n2 / 100) * n1 ;
        num2 = QString::number(n2);
        qDebug() << "n2 = "<<n2;
    }
    else if(num2 != "")
    {
        ui->label_msg->setText("0");

    }
    if(symbol == "÷")
    {
        //计算三位以上的式子
        x = n1 / n2;
        num1 = QString::number(x);
        qDebug()<<"x="<<x;
    }
    else if (symbol =="-")
    {
        x = n1 - n2;
        num1 = QString::number(x);
    }
    else if (symbol =="×")
    {
        x = n1 * n2;
        num1 = QString::number(x);
    }
    else if (symbol =="+")
    {
        x = n1 + n2;
        num1 = QString::number(x);
    }
    msg.append(num2);
    num2 = "";

}
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