作业

原页面 widget.cpp

#include "widget.h"#include "ui_widget.h"Widget::Widget(QWidget *parent)    : QWidget(parent)    , ui(new Ui::Widget){    ui->setupUi(this);    //去掉头部    this->setWindowFlag(Qt::FramelessWindowHint);    //去掉空白部分    this->setAttribute(Qt::WA_TranslucentBackground);}Widget::~Widget(){    delete ui;}void Widget::on_pushButton_clicked(){    if(ui->lineEdit->text() == "admin" && ui->lineEdit_2->text() == "123456")    {        //成功对话框        QMessageBox msg(QMessageBox::Information,"登录提示","登录成功",QMessageBox::Ok);        int rec = msg.exec();        if(rec == QMessageBox::Ok)        {            this->close();            emit goto_main();        }    }    else // 失败对话框    {        QMessageBox msg1(QMessageBox::Critical,"登录提示","账号和密码不匹配，是否重新登陆",QMessageBox::Yes | QMessageBox::No);        int rec = msg1.exec();        if(rec == QMessageBox::Yes)        {            ui->lineEdit->clear();            ui->lineEdit_2->clear();            msg1.close();        }        else        {            msg1.close();            this->close();        }    }}void Widget::on_pushButton_2_clicked(){    QMessageBox msg2(QMessageBox::Critical,"取消提示","您是否确定要退出登录？",QMessageBox::Yes | QMessageBox::No);    int rec = msg2.exec();    if(rec == QMessageBox::Yes)    {        msg2.close();        this->close();    }    else    {        msg2.close();    }}

main.cpp

#include "widget.h"#include "main_interface.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    Widget w;    w.show();    main_interface mf;    QObject::connect(&w,&Widget::goto_main,&mf,&main_interface::new_page);    return a.exec();}