作业

1> 手动将登录项目实现，不要使用拖拽编程

并且，当点击登录按钮时，后台会判断账号和密码是否相等，如果相等给出登录成功的提示，并且关闭当前界面，发射一个跳转信号，如果登录失败，则给出登录失败的提示，并清空密码框

当点击取消按钮时，直接关闭当前登录框

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QLineEdit>
#include <QLabel>
#include <QPushButton>
#include <QCheckBox>
#include <QPainter>
#include <QBitmap>
#include <QPainterPath>
#include <QDebug>
#include <QApplication>class MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void onLoginButtonClicked();void onCancelButtonClicked();private:void setupWindow();void setupWidgets();void setupPlaceholderText();bool validateLogin();QLineEdit *accountEdit;QLineEdit *passwordEdit;QLabel *accountLabel;QLabel *passwordLabel;QPushButton *loginButton;QPushButton *cancelButton;QCheckBox *rememberCheckBox;QCheckBox *autoLoginCheckBox;QLabel *avatarLabel;
};#endif // MAINWINDOW_H

#include "mainwindow.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}

#include "mainwindow.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent)
{// 设置窗口固定尺寸setFixedSize(600, 800);// 设置窗口标题setWindowTitle("QQ");setWindowIcon(QIcon("E:/a-U盘备份/a资料/证件/头像.jpg"));//设置窗口样式表setWindowOpacity(0.9);setStyleSheet("background-color:rgb(74, 255, 219);");  //设置背景色// 头像标签avatarLabel = new QLabel(this);avatarLabel->setGeometry(230, 150, 151, 151);QPixmap originalPixmap("E:/a-U盘备份/a资料/证件/头像.jpg");if (!originalPixmap.isNull()) {QPixmap circularPixmap(avatarLabel->size());circularPixmap.fill(Qt::transparent);QPainter painter(&circularPixmap);painter.setRenderHint(QPainter::Antialiasing);painter.setPen(Qt::NoPen);painter.drawRoundedRect(0, 0, circularPixmap.width(), circularPixmap.height(),circularPixmap.width() / 2, circularPixmap.width() / 2);QPainterPath path;path.addRoundedRect(0, 0, circularPixmap.width(), circularPixmap.height(), circularPixmap.width() / 2, circularPixmap.width() / 2);painter.setClipPath(path);painter.drawPixmap(0, 0, originalPixmap.scaled(circularPixmap.size(), Qt::KeepAspectRatioByExpanding, Qt::SmoothTransformation));avatarLabel->setPixmap(circularPixmap);}// 账号标签accountLabel = new QLabel("账号:", this);accountLabel->setGeometry(60, 480, 81, 50);// 账号输入框accountEdit = new QLineEdit(this);accountEdit->setGeometry(160, 480, 400, 50);accountEdit->setAlignment(Qt::AlignCenter);accountEdit->setPlaceholderText("请输入账号");// 密码标签passwordLabel = new QLabel("密码:", this);passwordLabel->setGeometry(60, 550, 81, 50);// 密码输入框passwordEdit = new QLineEdit(this);passwordEdit->setGeometry(160, 550, 400, 50);passwordEdit->setEchoMode(QLineEdit::Password);passwordEdit->setAlignment(Qt::AlignCenter);passwordEdit->setPlaceholderText("请输入密码");// 登录按钮loginButton = new QPushButton("登录", this);loginButton->setGeometry(130, 660, 150, 50);// 取消按钮cancelButton = new QPushButton("取消", this);cancelButton->setGeometry(330, 660, 150, 50);// 记住密码复选框rememberCheckBox = new QCheckBox("记住密码", this);rememberCheckBox->setGeometry(120, 620, 200, 30);// 自动登录复选框autoLoginCheckBox = new QCheckBox("自动登录", this);autoLoginCheckBox->setGeometry(330, 620, 200, 30);// 连接按钮点击信号到对应的槽函数bool connectResult1 = connect(loginButton, &QPushButton::clicked, this, &MainWindow::onLoginButtonClicked);bool connectResult2 = connect(cancelButton, &QPushButton::clicked, this, &MainWindow::onCancelButtonClicked);if (!connectResult1 ||!connectResult2) {qDebug() << "信号 - 槽连接失败";}
}MainWindow::~MainWindow()
{
}bool MainWindow::validateLogin()
{QString account = accountEdit->text();QString password = passwordEdit->text();// 这里是简单的校验逻辑，可根据实际需求修改return account == "123456" && password == "654321";
}void MainWindow::onLoginButtonClicked()
{if (validateLogin()) {qDebug() << "登录成功";qApp->quit();} else {qDebug() << "登录失败";passwordEdit->clear();}
}void MainWindow::onCancelButtonClicked()
{close();
}

2> 思维导图