QT day2

widget.cpp

#include "widget.h"

#include "ui_widget.h"

Widget::Widget(QWidget *parent)

    : QWidget(parent)

    , ui(new Ui::Widget)

{

    ui->setupUi(this);

    qDebug()<< this->size();    //获取界面的尺寸

    this->setFixedSize(380,600);  //固定界面尺寸

    this->setWindowTitle("小黑子app");     //设置窗口标题

    this->setWindowIcon(QIcon("C:\\Users\\Administrator\\Desktop\\QQ20230915190020.png"));

    QPushButton *btn1 = new QPushButton(this);  //构造一个按钮并直接指定父组件

    btn1->setText("登录");    //设置按钮文本内容

    btn1->move(80,500);

    btn1->resize(100, 40);

    //构建按钮2

    QPushButton *btn2 = new QPushButton(this);

    btn2->setText("取消");

    btn2->move(btn1->x()+150, btn1->y());

    btn2->resize(100, 40);

    //构建一个行编辑器并指定父组件

    QLineEdit *edit1 = new QLineEdit(this);

    edit1->resize(250, 50);

    edit1->move(120, 350);

    QLineEdit *edit2 = new QLineEdit(this);

    edit2->resize(250, 50);

    edit2->move(edit1->x(),edit1->y()+70);

    edit1->setPlaceholderText("树脂666");

    edit2->setEchoMode(QLineEdit::Password);    //设置回显

    //标签

    QLabel *lab1 = new QLabel(this);

    lab1->resize(50,50);

    lab1->setStyleSheet("background-color:yellow;");

    lab1->move(40, 350);

    lab1->setPixmap(QPixmap("C:\\Users\\Administrator\\Desktop\\QQ20230915211012.png"));

    lab1->setScaledContents(true);

    QLabel *lab2 = new QLabel(this);

    lab2->resize(50, 50);

    lab2->setStyleSheet("background-color:yellow;");

    lab2->move(lab1->x(), lab1->y()+70);

    lab2->setPixmap(QPixmap("C:\\Users\\Administrator\\Desktop\\QQ20230915211447.png"));

    lab2->setScaledContents(true);

    QMovie *movie = new QMovie("C:\\Users\\Administrator\\Desktop\\QQ20230915200707.gif");

    movie->start();

    QLabel *lab3 = new QLabel(this);

    lab3->setGeometry(0,0,600,340);

    lab3->setMovie(movie);

     lab3->setStyleSheet("background-color:yellow;");

        //QT4版手动连接buton1信号和槽

        connect(this->btn1,SIGNAL(clicked()),this,SLOT(but1_slot()));

        //QT5版手动连接button2信号和槽

      connect(this->btn2, &QPushButton::clicked, this, &Widget::btn2_slot);

}

Widget::~Widget()

{

    delete ui;

}

void Widget::btn1_slot()

{

    QMessageBox msgbox;     //实例化对象

    if(edit1->text()=="admin" &&edit2->text()=="123456")

    {

        msgbox.setIcon(QMessageBox::NoIcon);

                //msgbox.setWindowTitle("QQ");

                msgbox.setText("登陆成功");

                msgbox.setStandardButtons(QMessageBox::Ok);

                msgbox.setDefaultButton(QMessageBox::Ok);

                msgbox.exec();

                emit btn1_signal();

                this->close();

    }

    else

    {

        QMessageBox msgBox;

          int ret;

          msgbox.setIcon(QMessageBox::Critical);

          msgbox.setWindowTitle("QQ");

          msgbox.setText("账号密码不匹配，是否重新登录?");

          msgbox.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel);

          msgbox.setDefaultButton(QMessageBox::Ok);

          ret = msgBox.exec();

          if(ret == QMessageBox::Ok)

          {

                edit2->clear();

          }

           else if(ret == QMessageBox::Cancel)

          {

                msgbox.close();

          }

    }

 }

void Widget::btn2_slot()

{

    QMessageBox::StandardButton ret = QMessageBox::warning(             //调用静态成员函数，需要加上类名和作用域限定符

                                                   this,                 //父组件

                                                   //"QQ",                  //对话框标题

                                                   "是否确定退出登录？",        //对话框文本内容

                                                   QMessageBox::Yes|QMessageBox::No,   //提供的按钮

                                                   QMessageBox::Yes );                  //默认按钮

      //对用户点击的结果进行判断

      if(ret == QMessageBox::No)

      {

          this->close();

      }

}

widget.h

#ifndef WIDGET_H

#define WIDGET_H

#include 

#include 

#include 

#include 

#include 

#include

#include

#include "second.h"

QT_BEGIN_NAMESPACE

namespace Ui { class Widget; }

QT_END_NAMESPACE

class Widget : public QWidget

{

    Q_OBJECT

public:

    Widget(QWidget *parent = nullptr);

    ~Widget();

signals:

    void btn1_signal();

public slots:

    void btn1_slot();

    void btn2_slot();

private:

    Ui::Widget *ui;

    QPushButton *btn1;

    QPushButton *btn2;

    QLineEdit *edit1;

    QLineEdit *edit2;

    QLabel *lab1;

    QLabel *lab2;

    QLabel *lab3;

};

#endif // WIDGET_H

main.c

#include "widget.h"

#include 

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Widget w;

    w.show();

    return a.exec();

}

second.cpp

#include "second.h"

#include "ui_second.h"

second::second(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::second)

{

    ui->setupUi(this);

    //窗口属性

    this->setFixedSize(480,360);

    this->setWindowTitle("网络聊天室");

}

second::~second()

{

    delete ui;

}

void second::btn1_jumpslot()

{

    this->show();

second.h}

#ifndef SECOND_H

#define SECOND_H

#include 

namespace Ui {

class second;

}

class second : public QWidget

{

    Q_OBJECT

public:

    explicit second(QWidget *parent = nullptr);

    ~second();

private:

    Ui::second *ui;

public slots:

    void btn1_jumpslot();

};

#endif // SECOND_H