// widget.cpp
#include "widget.h"
#include <QPushButton>

//需求：創(chuàng)建兩個(gè)類 Teacher類 Student類
//下課后 老師發(fā)出一個(gè)信號(hào) 餓了
//學(xué)生響應(yīng)信號(hào)，處理信號(hào)的槽函數(shù)，請(qǐng)老師吃飯

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    tc = new Teacher(this);
    st = new Student(this);
    //connect(tc,&Teacher::hungry,st,&Student::treat);
    void(Teacher::*teacherSignal)(QString) = &Teacher::hungry;
    void(Student::*studentSlot)(QString) = &Student::treat;

    // 無參數(shù)觸發(fā)信號(hào)
    connect(tc,teacherSignal,st,studentSlot);
    classIsOver();

    // 有參數(shù)觸發(fā)信號(hào)
    //QPushButton* btn = new QPushButton;
    //btn->setParent(this);
    //btn->setText("下課");
    //connect(btn,&QPushButton::clicked,tc,teacherSignal);
    //connect(tc,teacherSignal,st,studentSlot);
}

void Widget::classIsOver(){
    //emit tc->hungry();
    emit tc->hungry("吃雞");

}

Widget::~Widget()
{

}
//teacher.cpp
//student.cpp
#include "student.h"
#include <QDebug>

Student::Student(QObject *parent) : QObject(parent)
{

}
void Student::treat(){
    qDebug()<<"請(qǐng)老師吃飯";
}
void Student::treat(QString foodName){
    qDebug()<<"請(qǐng)老師吃飯"<<foodName.toUtf8().data();
}

//widget
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include "teacher.h"
#include "student.h"

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();

    Teacher *tc;
    Student *st;
    //QString foodName;
    void classIsOver();

};

#endif // WIDGET_H


#ifndef TEACHER_H
#define TEACHER_H

#include <QObject>

class Teacher : public QObject
{
    Q_OBJECT
public:
    explicit Teacher(QObject *parent = 0);

signals:
    void hungry();
    void hungry(QString foodName);

public slots:
};

#endif // TEACHER_H

#ifndef STUDENT_H
#define STUDENT_H

#include <QObject>

class Student : public QObject
{
    Q_OBJECT
public:
    explicit Student(QObject *parent = 0);

signals:

public slots:
    void treat();
    void treat(QString foodName);
};

#endif // STUDENT_H