# 包含的模块, 一个是模型一个是图形界面
QT       += core gui
# 版本大于4的话加入这个模块
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
# 源文件
SOURCES += \
    main.cpp \
    myvidget.cpp
# 头文件
HEADERS += \
    myvidget.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

#include "mywindows.h"		//我自己创建的类

#include <QApplication>		//包含一个应用程序的头文件
//程序的入口
int main(int argc, char *argv[])
{
    //把命令行参数传递给这个类, 这是一个应用程序对象, 有且只有一个
    //这个类是用来管理设置Qt程序的运行, 针对QWidget应用程序
    QApplication a(argc, argv);
    //自定义的类, w是创建的对象, 是一个窗口
    MyWindows w;
    //对象调用函数, 默认不会显示, 使用show才会进行显示
    w.show();
    //调用的是一个事件循环, 等待鼠标键盘等的输入
    return a.exec();
}

#ifndef MYWINDOWS_H
#define MYWINDOWS_H
// 添加的窗口的类
#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MyWindows; }
QT_END_NAMESPACE

class MyWindows : public QMainWindow
{
    //这是一个宏定义, Qt信号槽需要这个, 允许类中使用信号和槽的机制
    Q_OBJECT

public:
    //两个函数, 构造函数, 析构函数
    MyWindows(QWidget *parent = nullptr);	//默认设置一个父类
    ~MyWindows();

private:
    Ui::MyWindows *ui;
};
#endif // MYWINDOWS_H

#include "mywindows.h"
#include "ui_mywindows.h"
#include <QDebug>


MyWindows::MyWindows(QWidget *parent)
    : QMainWindow(parent)		//初始化父类
    , i(4)
    , ui(new Ui::MyWindows)
{
    ui->setupUi(this);
    qDebug() << "构造函数执行" <<endl;
}

QObject::connect(sender, SIGNAL(signal()), receiver, SLOT(slot()));