QT DAY3作业

1.

界面二头文件： jump.h

#ifndef JUMP_H
#define JUMP_H

#include 
#include 
namespace Ui {
class Jump;
}

class Jump : public QWidget
{
    Q_OBJECT

public:
    explicit Jump(QWidget *parent = nullptr);
    ~Jump();

public slots:
    void my_jump_slot();

private:
    Ui::Jump *ui;
};

#endif // JUMP_H

界面一头文件：mywidget.h

#ifndef MYWIDGET_H
#define MYWIDGET_H

#include 
#include 
#include 
#include 
#include 
namespace Ui {
class MyWidget;
}

class MyWidget : public QWidget
{
    Q_OBJECT

public:
    explicit MyWidget(QWidget *parent = nullptr);
    ~MyWidget();

private:
    Ui::MyWidget *ui;

signals:
    void my_jump();

public slots:
    void my_close();
    void login_slot();
};

#endif // MYWIDGET_H

界面2功能代码：jump.cpp

#include "jump.h"

#include "ui_jump.h"

Jump::Jump(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Jump)
{
    ui->setupUi(this);
    //创建动图对象
    QMovie *mv = new QMovie(":/pictrue/pic.gif");
    //加入标签
    ui->jump_lab->setMovie(mv);
    //启动动图
    mv->start();
    //自动适应大小
    ui->jump_lab->setScaledContents(true);
}

Jump::~Jump()
{
    delete ui;
}

//跳转信号的槽处理
void Jump::my_jump_slot()
{
    this->show();
}

界面1功能代码

#include "mywidget.h"
#include "ui_mywidget.h"

MyWidget::MyWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::MyWidget)
{
    ui->setupUi(this);

    //创建动图对象
    QMovie *mv = new QMovie(":/pictrue/pic1.gif");
    //加入标签
    ui->logo_lab->setMovie(mv);
    //启动动图
    mv->start();
    //自动适应大小
    ui->logo_lab->setScaledContents(true);

    //加入图片
    ui->username_lab->setPixmap(QPixmap(":/pictrue/userName.jpg"));
    //自动适应大小
    ui->username_lab->setScaledContents(true);

    ui->passwd_lab->setPixmap(QPixmap(":/pictrue/passwd.jpg"));
    ui->passwd_lab->setScaledContents(true);

    //设置占位
    ui->username_edit->setPlaceholderText("账号/邮箱/手机");
    ui->passwd_edti->setPlaceholderText("密码");
    //设置密码输入
    ui->passwd_edti->setEchoMode(QLineEdit::Password);

    //=======================信号和槽=========================
    //手动连接，qt4版本，取消按钮自定义槽函数关闭窗口
    connect(ui->cancel_btn,SIGNAL(clicked()),this,SLOT(my_close()));
    //手动连接，qt5版本
    connect(ui->login_btn,&QPushButton::clicked,this,&MyWidget::login_slot);


}

MyWidget::~MyWidget()
{
    delete ui;
}

//手动连接自定义槽函数,qt4版本，关闭窗口
void MyWidget::my_close()
{
    //静态成员函数版消息对话框
    int ret = QMessageBox::question(this,"问题","你是否确定要退出登录？");
    //判断返回按钮值
    if(ret == QMessageBox::Yes)
    {
        this->close();
    }
}

//手动连接自定义槽函数，qt5版本，登录
void MyWidget::login_slot()
{
    if(ui->username_edit->text() == "admin" && ui->passwd_edti->text() == "123456")
    {
        //属性版消息对话框
        //实例化消息对话框对象msg1
         QMessageBox msg1(QMessageBox::NoIcon,"登录状态","登录成功！！！",QMessageBox::Ok,this);
         //调用exec显示对话框
         int ret = msg1.exec();
         //判断按钮
         if(ret == QMessageBox::Ok)
         {
             //触发信号实现跳转界面
             emit this->my_jump();
             //关闭该界面
             this->close();
         }
    }else {
        //属性版消息对话框
        //实例化消息对话框对象msg2
        QMessageBox msg2(QMessageBox::Critical,"登录状态",
                         "账号和密码不匹配，是否重新登录？",QMessageBox::Yes|QMessageBox::No,this);
        //调用exec
        int ret = msg2.exec();
        //判断按钮
        if(ret == QMessageBox::Yes)
        {
            ui->passwd_edti->clear();  //登录失败清空密码栏
        }else {
            this->close();
        }

    }
}

主函数代码：main.cpp

#include "mywidget.h"
#include "jump.h"
#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyWidget w;
    w.show();

    //实例化界面对象s
    Jump s;

    //连接函数，实现两个界面跳转
    QObject::connect(&w,&MyWidget::my_jump,&s,&Jump::my_jump_slot);
    return a.exec();
}

效果图

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2.思维导图