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_OBJECTprivate 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

#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()
{
}