练习：优化登录框，输入完用户名和密码后，点击登录，判断账户是否为 Admin 密码 为123456，如果判断成功，则输出登录成功，并关闭整个登录界面，如果登录失败，则提示登录失败，并将账号和密码的行编辑器中的内容清空

#include "mywidget.h"


MyWidget::MyWidget(QWidget *parent)
    : QWidget(parent)
    ,btn(new QPushButton(this)),edit1(new QLineEdit(this)),edit2(new QLineEdit(this))

{
    //==============窗口相关设置=======
    this->resize(540,415);
    this->setFixedSize(540,415);
    //窗口标题
    this->setWindowTitle("盗版QQ");
    //窗口图标
    this->setWindowIcon(QIcon(":/pictrue/qq.gif"));
    //背景颜色
    this->setStyleSheet("background-color:white");
    //去掉头部
    this->setWindowFlag(Qt::FramelessWindowHint);


    //============标签相关设置=======
    QLabel *lab1 = new QLabel(this);
    //设置大小
    lab1->resize(540, 160);
    lab1->setStyleSheet("background-color:pink");
    //动图类 接收动图
    QMovie *mv = new QMovie(":/pictrue/zz.gif");
    //将动图放入标签中
    lab1->setMovie(mv);
    //让动图动起来
    mv->start();
    //自动适应
    lab1->setScaledContents(true);


    QLabel *lab2 = new QLabel(this);
    lab2->resize(30,30);
    lab2->move(120,210);
    lab2->setPixmap(QPixmap(":/pictrue/wodepeizhenshi.png"));
    lab2->setScaledContents(true);


    QLabel *lab3 = new QLabel(this);
    lab3->resize(30,30);
    lab3->move(120, 260);
    lab3->setPixmap(QPixmap(":/pictrue/passwd.jpg"));
    lab3->setScaledContents(true);


    //============行编辑器相关设置=======
//    QLineEdit *edit1 = new QLineEdit(this);
    edit1->resize(275,30);
    edit1->move(155,210);
    edit1->setPlaceholderText("QQ号/手机号/邮箱");


 //   QLineEdit *edit2 = new QLineEdit(this);
    edit2->resize(275,30);
    edit2->move(155,260);
    edit2->setPlaceholderText("密码");
    edit2->setEchoMode(QLineEdit::Password);


    //============按钮相关设置=======
//    QPushButton *btn = new QPushButton("登录",this);
    btn->resize(300,45);
    btn->move(120,345);
    //样式函数setStyleSheet()
   btn->setStyleSheet("background-color:rgb(8,189,253);border-radius:5px;color:white");
   // btn->setEnabled(false);



    connect(edit1,&QLineEdit::textChanged,this,&MyWidget::signel);
    connect(edit2,&QLineEdit::textChanged,this,&MyWidget::signel);


}

void MyWidget::signel()
{
      if(edit1->text().size()>=5 && edit2->text().size()>=5){
          btn->setStyleSheet("background-color:green");
        }

 }
MyWidget::~MyWidget()
{
}

#ifndef MYWIDGET_H
#define MYWIDGET_H

#include <QWidget>
#include<QIcon> //图标类
#include<QLabel> //标签类
#include<QMovie> //动图类
#include<QLineEdit> //行编辑器类
#include<QPushButton> //按钮类
#include<QDebug>

QT_BEGIN_NAMESPACE
namespace Ui { class MyWidget; }
QT_END_NAMESPACE

class MyWidget : public QWidget
{
    Q_OBJECT
public:
 QPushButton *btn;
 QLineEdit *edit1;
 QLineEdit *edit2;
public:
    MyWidget(QWidget *parent = nullptr);
    ~MyWidget();
public slots:

    void signel();             //自定义处理按钮4的槽函数的声明
private:
    Ui::MyWidget *ui;
};
#endif // MYWIDGET_H