C++ day2

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

    ui->logoLabel->setPixmap(QPixmap(":/pictrue/logo.png"));
    ui->logoLabel->setScaledContents(true);

    ui->actLabel->setPixmap(QPixmap(":/pictrue/wodepeizhenshi.png"));
    ui->actLabel->setScaledContents(true);

    ui->pwdLabel->setPixmap(QPixmap(":/pictrue/passwd.jpg"));
    ui->pwdLabel->setScaledContents(true);

    ui->pwdLineEdit->setEchoMode(QLineEdit::Password);
	
    // 手动连接信号和槽
    connect(ui->loginButton, SIGNAL(clicked()), this, SLOT(mySlot()));
}

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

void Widget::on_cancelButton_clicked()
{
   this->close();
}

void Widget::mySlot()
{
    if(ui->actLineEdit->text() == "admin" && ui->pwdLineEdit->text() == "123456")
    {
        QLabel *successMsg = new QLabel("登录成功", this);
        successMsg->move((width()-successMsg->width())/2, ui->loginButton->y() + 40);
        successMsg->setStyleSheet("background-color:green; color: white");
       
        // 使label内的字体居中
        successMsg->setAlignment(Qt::AlignCenter);
        
        successMsg->resize(100, 30);
        
        // 显示label
        successMsg->show();
        
        // 延时关闭窗口
        QTimer::singleShot(3000, this, SLOT(closeWindow()));
    }
    else
    {
        QLabel *failureMsg = new QLabel("登录失败", this);
        failureMsg->move((width()-failureMsg->width())/2, ui->loginButton->y() + 40);
        failureMsg->setStyleSheet("background-color:red; color: white");
        
        failureMsg->setAlignment(Qt::AlignCenter);
        failureMsg->resize(100, 30);
        
        // 显示错误信息
        failureMsg->show();
        
        // 清空账号和密码输入行
        ui->actLineEdit->clear();
        ui->pwdLineEdit->clear();
    }
}

void Widget::closeWindow()
{
    this->close();
}