一个简单的QQ登陆界面

#ifndef DIALOG_H

#define DIALOG_H

#include <QDialog>

#include <QPushButton>

#include <QLineEdit>

#include <QLabel>

#include <QMessageBox>

#include <QGridLayout>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

public:

    //登录button以及取消button

    QPushButton* loginButton;

    QPushButton* cancelButton;

//账号和密码label

    QLabel* name;

    QLabel* password;

//输入框

    QLineEdit* nameLineEdit;

    QLineEdit* passwordLineEdit;

//布局

    QGridLayout* layout;

    explicit Dialog(QWidget *parent = 0);

    ~Dialog();

private slots:

    void login();

    void cancel();

private:

    Ui::Dialog *ui;

};

#endif // DIALOG_H

#include "dialog.h"

#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :

QDialog(parent),

ui(new Ui::Dialog)

{

ui->setupUi(this);

//设置主窗口的标题

setWindowTitle(tr("QQ 登陆"));

//设置label标签

name = new QLabel;

name->setText(tr("账号："));

password = new QLabel;

password->setText(tr("密码："));

//添加输入lineEdit控件

nameLineEdit = new QLineEdit;

passwordLineEdit = new QLineEdit;

//设置密码输入框接受的内容为黑色的圆点

passwordLineEdit->setEchoMode(QLineEdit::Password);

//设置登陆和取消的按钮

loginButton = new QPushButton;

loginButton->setText(tr("登陆"));

cancelButton = new QPushButton;

cancelButton->setText(tr("取消"));

//窗口布局,添加用到的控件

layout = new QGridLayout(this);

layout->addWidget(name,0,0);

layout->addWidget(nameLineEdit,0,1);

layout->addWidget(password,1,0);

layout->addWidget(passwordLineEdit,1,1);

layout->addWidget(loginButton,2,0);

layout->addWidget(cancelButton,3,0);

//链接信号与槽

connect(loginButton,SIGNAL(clicked()),this,SLOT(login()));

connect(cancelButton,SIGNAL(clicked()),this,SLOT(cancel()));

}

//登陆按钮接收到信号之后做的处理

void Dialog::login()

{

//用户名前如果有空格按照正确的处理

//  if(nameLineEdit->text().trimmed() == tr("123456") && passwordLineEdit->text() == tr("456789"))

//如果输入的账号和密码已经存在且都相同，就接受

if(nameLineEdit->text() == tr("123456") && passwordLineEdit->text() == tr("456789"))

accept();

else//显示一个警告框

{

QMessageBox::warning(this,tr("Waring"),tr("user and password waring"),QMessageBox::Yes);

//登陆不正确时，清空账户输入框和密码框，然后光标自动跳转到账户名输入框

nameLineEdit->clear();

passwordLineEdit->clear();

nameLineEdit->setFocus();

}

}

//取消操作处理

void Dialog::cancel()

{

exit(1);

}

Dialog::~Dialog()

{

delete ui;

}