QT控件笔记 | 易学教程

#ifndef LOGIN_H #define LOGIN_H  #include <QMainWindow> #include <QDebug> #include <QJsonObject>  #include <QLabel> #include <QLineEdit> #include <QRadioButton> #include <QPushButton> #include <QMessageBox> #include <QThread>  namespace Ui {     class CLogin; }  class CLogin : public QMainWindow {     Q_OBJECT  public:     explicit CLogin(QWidget *parent = 0);     ~CLogin();     void Init();  private:     Ui::CLogin *ui;      QLabel       *pLabelUsrName;     QLabel       *pLabelUsrPwd;      QLineEdit    *pLineEditUsrName;     QLineEdit    *pLineEditUsrPwd;      QRadioButton *pRadioButtonSavePwd;     QRadioButton *pRadioButtonAutoLogin;      QPushButton  *pButtonLogin;   private slots:     void Login();  signals:     void LoginAuto();     void PwdOK(); };  #endif // LOGIN_H

#include "login.h" #include "ui_login.h"   CLogin::CLogin(QWidget *parent) :     QMainWindow(parent),     ui(new Ui::CLogin) {     ui->setupUi(this);     this->setWindowTitle("登录");      this->setMinimumHeight(300);     this->setMaximumHeight(300);      this->setMinimumWidth(400);     this->setMaximumWidth(400);      Init(); }  CLogin::~CLogin() {     delete pLabelUsrName;     delete pLabelUsrPwd;      delete pLineEditUsrName;     delete pLineEditUsrPwd;      delete pRadioButtonSavePwd;     delete pRadioButtonAutoLogin;      delete pButtonLogin;      delete ui; }  void CLogin::Init() {     pLabelUsrName = new QLabel(this);     pLabelUsrName->setText("帐号：");     pLabelUsrName->setGeometry(100,100, 30,20);      pLabelUsrPwd = new QLabel(this);     pLabelUsrPwd->setText("密码：");     pLabelUsrPwd->setGeometry(100,130, 30,20);      pLineEditUsrName = new QLineEdit(this);     pLineEditUsrName->setText("");     pLineEditUsrName->setGeometry(150,100, 150,20);      pLineEditUsrPwd = new QLineEdit(this);     pLineEditUsrPwd->setText("");     pLineEditUsrPwd->setGeometry(150,130, 150,20);     pLineEditUsrPwd->setEchoMode(QLineEdit::Password);      pRadioButtonSavePwd = new QRadioButton(this);     pRadioButtonSavePwd->setText("记住密码");     pRadioButtonSavePwd->setGeometry(100,170, 100,20);     pRadioButtonSavePwd->setChecked(1);      pRadioButtonAutoLogin = new QRadioButton(this);     pRadioButtonAutoLogin->setText("自动登录");     pRadioButtonAutoLogin->setGeometry(200,170, 100,20);     pRadioButtonAutoLogin->setChecked(0);      pButtonLogin = new QPushButton(this);     pButtonLogin->setText("登录");     pButtonLogin->setGeometry(130,200, 150,20);     pButtonLogin->setShortcut(Qt::Key_Return);     //pButtonLogin->setStyleSheet("background:blue");  #if 0     //设置背景图片     this->setAutoFillBackground(true); // 这句要加上, 否则可能显示不出背景图.     QPalette palette = this->palette();     palette.setBrush(QPalette::Window,             QBrush(QPixmap(":/images/login.png").scaled(// 缩放背景图.                 this->size(),                 Qt::IgnoreAspectRatio,                 Qt::SmoothTransformation)));             // 使用平滑的缩放方式     this->setPalette(palette);                           // 给widget加上背景图      //TAB     this->setTabOrder(pLabelUsrName,        pLabelUsrPwd);     this->setTabOrder(pLabelUsrPwd,         pLineEditUsrName);     this->setTabOrder(pLineEditUsrName,     pLineEditUsrPwd);     this->setTabOrder(pLineEditUsrPwd,      pRadioButtonSavePwd);     this->setTabOrder(pRadioButtonSavePwd,  pRadioButtonAutoLogin);     this->setTabOrder(pRadioButtonAutoLogin,pButtonLogin); #endif      this->show();      connect(pButtonLogin, SIGNAL(clicked()), this, SLOT(Login()));     connect(this, SIGNAL(LoginAuto()), this, SLOT(Login()));      if (pRadioButtonAutoLogin->isChecked())     {         emit LoginAuto();     }      qDebug() << "Init Ok :"; }  void CLogin::Login() {     QString UsrName = pLineEditUsrName->text();     QString UsrPwd = pLineEditUsrPwd->text();      qDebug() << "UsrName:" << UsrName;     qDebug() << "UsrPwd :" << UsrPwd;      QJsonObject Value;     Value["UsrName"] = UsrName;     Value["UsrPwd"] = UsrPwd;      qDebug() << "QJson :" << Value;      std::string strUsrName = UsrName.toStdString();     std::string strUsrPwd = UsrPwd.toStdString();      if (strcmp(strUsrName.c_str(),"root")          || strcmp(strUsrPwd.c_str(),"123456"))     {         QMessageBox::warning(this,"告警提示",tr("输入帐号或密码有误，请确认后输入！"));     }     else     {         QMessageBox::information(this,"提示",tr("登录成功！"));         emit PwdOK();     } }

window.h内容：

#ifndef WINDOW_H #define WINDOW_H  #include <QWidget>  namespace Ui { class CWindow; }  class CWindow : public QWidget {     Q_OBJECT  public:     explicit CWindow(QWidget *parent = 0);     ~CWindow();  private:     Ui::CWindow *ui;  private slots:     void PwdOK(){this->show();}; };  #endif // WINDOW_H

window.cpp内容：

#include "window.h" #include "ui_window.h"  CWindow::CWindow(QWidget *parent) :     QWidget(parent),     ui(new Ui::CWindow) {     ui->setupUi(this);     this->setWindowTitle("订单管理系统");      this->setMinimumHeight(600);     this->setMaximumHeight(600);      this->setMinimumWidth(800);     this->setMaximumWidth(800);      //this->show(); }  CWindow::~CWindow() {     delete ui; }

main.cpp内容：

#include "login.h" #include "window.h" #include <QApplication>   int main(int argc, char *argv[]) {     QApplication a(argc, argv);      CLogin  wLogin;     CWindow wWindow;      QObject::connect(&wLogin, SIGNAL(PwdOK()), &wWindow, SLOT(PwdOK()));      return a.exec(); }

运行结果：

文章来源: QT控件笔记

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