登录对话框

一. 需求分析

1. 代码可复用
2. 可以获取用户名和密码

二. 登录对话框的设计与框架

1. 类图

2. LoginDialog类的封装

   #ifndef LOGINDIALOG_H
   #define LOGINDIALOG_H
   
   #include <QLabel>
   #include <QLineEdit>
   #include <QPushButton>
   #include <QDialog>
   
   
   class QLoginDialog : public QDialog
   {
       Q_OBJECT
   private:
       QLabel UserLabel;
       QLabel PwdLabel;
       QLineEdit UserEdit;
       QLineEdit PwdEdit;
       QPushButton LoginBtn;
       QPushButton CancelBtn;
       QString m_user;
       QString m_pwd;
   private slots:
       void LoginBtn_Clicked();
       void CancelBtn_Clicked();
   public:
       QLoginDialog(QWidget *parent = 0);
       QString getUser();
       QString getPwd();
       ~QLoginDialog();
   };
   
   #endif // LOGINDIALOG_H
   
   

6.3 实验 （添加亿点点细节）

1. 主函数

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

2. 对话框需要一个主页面，这里封装一个自己的Widget

   #ifndef WIDGET_H
   #define WIDGET_H
   
   #include <QWidget>
   #include <QPushButton>
   
   class Widget : public QWidget
   {
       Q_OBJECT
   private:
       QPushButton TestBtn;
   private slots:
       void TestBtn_Clicked();
   public:
       Widget(QWidget *parent = 0);
       ~Widget();
   };
   
   #endif // WIDGET_H
   
   

   #include "Widget.h"
   #include "ui_Widget.h"
   
   #include <QDebug>
   #include "LoginDialog.h"
   Widget::Widget(QWidget *parent) : QWidget(parent), TestBtn(this)
   {
       TestBtn.setText("Test Login Dialog");
       TestBtn.move(10, 10);
       TestBtn.resize(180, 30);
       setFixedSize(200, 50);
   
       connect(&TestBtn, SIGNAL(clicked()), this, SLOT(TestBtn_Clicked()));
   
       setAttribute(Qt::WA_DeleteOnClose);
   }
   
   void Widget::TestBtn_Clicked()
   {
       QLoginDialog dlg;
   
       if( dlg.exec() == QDialog::Accepted )  //模态对话框
       {
           qDebug() << "User: " + dlg.getUser();
           qDebug() << "Pwd: " + dlg.getPwd();
       }
   }
   
   Widget::~Widget()
   {
   
   }
   
   

3. LoginDialog类的封装和实现

   #ifndef LOGINDIALOG_H
   #define LOGINDIALOG_H
   
   #include <QLabel>
   #include <QLineEdit>
   #include <QPushButton>
   #include <QDialog>
   
   
   class QLoginDialog : public QDialog
   {
       Q_OBJECT
   private:
       QLabel UserLabel;
       QLabel PwdLabel;
       QLineEdit UserEdit;
       QLineEdit PwdEdit;
       QPushButton LoginBtn;
       QPushButton CancelBtn;
       QString m_user;
       QString m_pwd;
   private slots:
       void LoginBtn_Clicked();
       void CancelBtn_Clicked();
   public:
       QLoginDialog(QWidget *parent = 0);
       QString getUser();
       QString getPwd();
       ~QLoginDialog();
   };
   
   #endif // LOGINDIALOG_H
   
   

   #include "LoginDialog.h"
   
   #include <QDebug>
   #include "LoginDialog.h"
   QLoginDialog::QLoginDialog(QWidget* parent) : QDialog(parent, Qt::WindowCloseButtonHint),
       UserLabel(this), PwdLabel(this), UserEdit(this), PwdEdit(this), LoginBtn(this), CancelBtn(this)
   {
       UserLabel.setText("User ID:");
       UserLabel.move(20, 30);
       UserLabel.resize(60, 25);
   
       UserEdit.move(85, 30);
       UserEdit.resize(180, 25);
   
       PwdLabel.setText("Password:");
       PwdLabel.move(20, 65);
       PwdLabel.resize(60,25);
   
       PwdEdit.move(85, 65);
       PwdEdit.resize(180, 25);
       PwdEdit.setEchoMode(QLineEdit::Password);
   
       CancelBtn.setText("Cancel");
       CancelBtn.move(85, 110);
       CancelBtn.resize(85, 30);
   
       LoginBtn.setText("Login");
       LoginBtn.move(180, 110);
       LoginBtn.resize(85, 30);
   
       setWindowTitle("Login");
       setFixedSize(285, 170);
   
   //消息映射
       connect(&LoginBtn, SIGNAL(clicked()), this, SLOT(LoginBtn_Clicked()));
       connect(&CancelBtn, SIGNAL(clicked()), this, SLOT(CancelBtn_Clicked()));
   }
   
   void QLoginDialog::LoginBtn_Clicked()
   {
       qDebug() << "LoginBtn_Clicked() Begin";
   
       m_user = UserEdit.text().trimmed();
       m_pwd = PwdEdit.text();
   
       done(Accepted);
   
       qDebug() << "LoginBtn_Clicked() End";
   }
   
   void QLoginDialog::CancelBtn_Clicked()
   {
       qDebug() << "CancelBtn_Clicked() Begin";
   
       done(Rejected);
   
       qDebug() << "CancelBtn_Clicked() End";
   }
   
   QString QLoginDialog::getUser()
   {
       return m_user;
   }
   
   QString QLoginDialog::getPwd()
   {
       return m_pwd;
   }
   
   QLoginDialog::~QLoginDialog()
   {
   
   }