day2_QT

登录窗口

loginwindow.h

#ifndef LOGINWINDOW_H
#define LOGINWINDOW_H

#include <QWidget>
#include <QDebug>
#include <QIcon>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QObject>
#include "homepage.h"


class LoginWindow : public QWidget
{
    Q_OBJECT


private slots:
    void get_accountAndpwd();

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


private:
    QPushButton *login;
    QPushButton *exit;
    QLineEdit *editpwd;
    QLabel *labelpwd;
    QLineEdit *editaccount;
    QLabel *labelaccount;
    QLabel *labelpic;

    HomePage *homepage;

};
#endif // LOGINWINDOW_H

loginwindow.c文章来源地址https://uudwc.com/A/oL3AJ

#include "loginwindow.h"
#include <QMessageBox>




LoginWindow::LoginWindow(QWidget *parent)
    : QWidget(parent)
{
    //设置窗口标题和图标
    this->setWindowTitle("ChatWe");
    this->setWindowIcon(QIcon(":/login.png"));

    //设置窗口的大小 固定
    this->setFixedSize(800,500);

    //设置上1/2处label图标放置背景图
    this->labelpic = new QLabel(this);
    //一半大小
    this->labelpic->resize(800,250);
    //放入图片
    this->labelpic->setPixmap(QPixmap(":/bg.png"));

    /***********************************************************************/

    //账号图标
    this->labelaccount = new QLabel(this);
    this->labelaccount->resize(50,50);
    //移动位置
    this->labelaccount->move(150,280);
    this->labelaccount->setPixmap(QPixmap(":/account.png"));
    this->labelaccount->setScaledContents(true);

    //账号编辑框
    this->editaccount = new QLineEdit(this);
    this->editaccount->setPlaceholderText("请输入账号");
    this->editaccount->setAlignment(Qt::AlignCenter);
    this->editaccount->resize(300,50);
    this->editaccount->setMaxLength(20);
    this->editaccount->move(labelaccount->x()+100,labelaccount->y());

    //密码图标
    this->labelpwd = new QLabel(this);
    this->labelpwd->resize(50,50);
    //移动位置
    this->labelpwd->move(labelaccount->x(),labelaccount->y()+80);
    this->labelpwd->setPixmap(QPixmap(":/psw.png"));
    this->labelpwd->setScaledContents(true);

    //密码编辑框
    this->editpwd = new QLineEdit(this);
    this->editpwd->setPlaceholderText("请输入密码");
    this->editpwd->setEchoMode(QLineEdit::Password);
    this->editpwd->setAlignment(Qt::AlignCenter);
    this->editpwd->resize(300,50);
    this->editpwd->setMaxLength(20);
    this->editpwd->move(editaccount->x(),editaccount->y()+80);

    //登录按钮
    this->login = new QPushButton(QIcon(":/accept.png"),"登录",this);
    this->login->move(editpwd->x()+10,editpwd->y()+80);

    //退出按钮
    this->exit = new QPushButton(QIcon(":/reject.png"),"退出",this);
    this->exit->move(editpwd->x()+180,editpwd->y()+80);

    /*QT5版本 将clicked 信号发送给自定义的槽函数判断账号和密码*/
    this->connect(this->login,&QPushButton::clicked,this, &LoginWindow::get_accountAndpwd);

}

//功能函数，获取账号和密码
void LoginWindow::get_accountAndpwd()
{
    QString username = this->editaccount->text();
    QString password = this->editpwd->text();
    if(username == "admin" && password == "123456"){
        //密码正确
        QMessageBox successBox(QMessageBox::Information,"success","登录成功",
                                        QMessageBox::Ok|QMessageBox::Cancel);
        successBox.setWindowIcon(QIcon(":/login.png"));
        int ret = successBox.exec();
        if(ret == QMessageBox::Ok){
            //关闭当前页面
            this->hide();
            //跳转到主页
            this->homepage = new HomePage();
            homepage->show();
        }else {
            //弹出询问界面
            QMessageBox exitBox(QMessageBox::Question,"quit","是否退出？",
                                            QMessageBox::Yes|QMessageBox::No);
            exitBox.setWindowIcon(QIcon(":/login.png"));
            int ret = exitBox.exec();
            if(ret == QMessageBox::Yes){
                //关闭当前页面
                this->hide();
                //跳转到主页
                this->homepage = new HomePage();
                homepage->show();
            }else{
                //退出程序
                this->close();
            }
        }

    }else{
        //账号密码 不匹配 弹出错误对话框
        int ret = QMessageBox::critical(this,tr("ChatWe"),tr("账号密码不匹配.\n""是否重新登录？"),
                                        QMessageBox::Ok|QMessageBox::Cancel,  //两个选项
                                        QMessageBox::Ok);                     //默认选项
        if(ret == QMessageBox::Ok){
            //清空两个框
            this->editaccount->clear();
            this->editpwd->clear();
        }else {
            //退出程序
            this->close();
        }
    }
}


LoginWindow::~LoginWindow()
{
}