基于QT+MYSQL的点餐系统源码（全部资料）.zip

#include "login.h" #include "ui_login.h" Login::Login(QWidget *parent) : QDialog(parent), ui(new Ui::Login) { ui->setupUi(this); this->initSytleSheet(); } Login::~Login() { delete ui; } void Login::initSytleSheet() { //-------------------登录窗口背景设置---------------------- this->setWindowFlags(Qt::FramelessWindowHint); //屏蔽窗口上面标题 // this->setWindowOpacity(0.7); //设置透明度，范围0 至 1.0 该属性会将子控件也设置透明度 // this->setAttribute(Qt::WA_TranslucentBackground); // 不会将子控件设置成透明 // this->setStyleSheet("background:rgba(0,0,0,255);"); // this->setModal(true); // 设置无法点击其他窗口 this->setStyleSheet("QDialog{background-color:rgb(255,255,255);}"); //------------------设置编辑框前面图标--------------------- QAction *username_action = new QAction(ui->le_username); username_action->setIcon(QIcon(":/res/pic/user.png")); ui->le_username->addAction(username_action,QLineEdit::LeadingPosition); QAction *pwd_action = new QAction(ui->le_password); pwd_action->setIcon(QIcon(":/res/pic/password.png")); ui->le_password->addAction(pwd_action,QLineEdit::LeadingPosition); //--------------------设置编辑框样式------------------------ // 使用qss文件中定义的通用样式 ui->le_username->setStyleSheet(ui->le_username->styleSheet().append("font-size:24px")); ui->le_password->setStyleSheet(ui->le_username->styleSheet()); //---------------------btn-------------------------------- ui->btn_login->setText(tr("login")); ui->btn_login->setProperty("btnBlueTrans","true"); ui->btn_login->setStyleSheet(ui->btn_login->styleSheet().append("color:black;font-size:24px;")); ui->btn_logout->setText(tr("×")); ui->btn_logout->setProperty("btnBlueTrans","red"); ui->btn_logout->setStyleSheet(ui->btn_logout->styleSheet().append("QPushButton{color:red;font-size:44px;border-radius:50px;}" \ "QPushButton:hover{color: white;}")); ui->btn_logout->setToolTip(tr("quit")); // -------------------other-------------------------------- ui->txt_login_error->hide(); } void Login::on_btn_logout_clicked() { exit(0); } bool Login::judgeLogin() { QString user_username = ui->le_username->text().trimmed(); if (user_username == "") return false; QString str_query = QString("select password from tb_user where username = '%1';").arg(user_username); QSqlQuery query(str_query,QSqlDatabase::database()); QSqlRecord rec = query.record(); while(query.next()) { rec = query.record(); QString user_password = ui->le_password->text().trimmed(); QString value = query.value(0).toString(); return value == user_password; } return false; } void Login::on_btn_login_clicked() { if (!this->judgeLogin()) { ui->txt_login_error->setText(tr("empty or error username or password, please check agin!")); ui->txt_login_error->show(); } else { emit sigSuccessLogin(); } } void Login::on_le_username_textChanged(const QString &arg1) { ui->txt_login_error->hide(); } void Login::on_le_password_textChanged(const QString &arg1) { ui->txt_login_error->hide(); }