qt 简单登录界面(一)

widget.h

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include<QLineEdit>
class Widget : public QWidget
{
    Q_OBJECT
public slots:
    void foo();
public:
    Widget(QWidget *parent = 0);
    ~Widget();
    QLineEdit *userEdit;
    QLineEdit * passwdEdit;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include<QBoxLayout>
#include<QGridLayout>
#include<QPushButton>
#include<QLabel>
#include<QLineEdit>
#include<QDebug>
#include <QApplication>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
        QGridLayout* grid=new  QGridLayout(this);
        QHBoxLayout* hbox=new QHBoxLayout(this);
        QPushButton *ok=new QPushButton("确认");
        QPushButton *cancel=new QPushButton("取消");
        QLabel *userLabel= new QLabel("用户:");
        userEdit=new QLineEdit;
        QLabel* passwdLabel=new QLabel("密码:");
        passwdEdit=new QLineEdit;

        passwdEdit->setEchoMode(QLineEdit::Password);
        grid->addWidget(userLabel,0,0,1,1);
        grid->addWidget(userEdit,0,1,1,1);
        grid->addWidget(passwdLabel,1,0,1,1);
        grid->addWidget(passwdEdit,1,1,1,1);

        hbox->addWidget(ok);
        hbox->addWidget(cancel);

        grid->addLayout(hbox,2,0,1,2);
        this->setLayout(grid);

        connect(cancel,SIGNAL(clicked()),this,SLOT(close()));
        connect(ok,SIGNAL(clicked()),this,SLOT(foo()));

}
void Widget::foo()
{
    if(userEdit->text()=="admin")
    {
        if(passwdEdit->text()=="123456")
        {
            qDebug()<<"登录成功"<<endl;
        }
        else
        {
          qDebug()<<"密码错误"<<endl;
        }
    }
    else {
        qDebug()<<"用户名不存在"<<endl;
    }
}
Widget::~Widget()
{

}

main.cpp:

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.resize(500,300);
    w.show();

    return a.exec();
}

输出: