In Qt, the signal generator and the signal receiver are bound together by connect(). The format is as follows:
connect (signal generator, generated signal, signal receiver, processing function)
gives a student to invite the teacher to eat, use the signal and The slot mechanism is implemented.
Software requirements: Create two teacher classes. After the Student
class is over, the teacher zt will send a signal : hungry(); the
student responds to the signal Student st. The signal processing slot function : treat ().
As follows:
//1) The main function header file one.h
#ifndef ONE_H
#define ONE_H
#include <QWidget>
#include "teacher.h"
#include "student.h"
class one : public QWidget
{
Q_OBJECT
public:
one(QWidget *parent = 0);
~one();
Teacher *zt;
Student *st;
void classIsOver();
};
#endif // ONE_H
//The main function source file one.cpp
#include "one.h"
//需求：创建2个类 Teacher类，Student类
//下课后, 老师Teacher zt 会发出一个信号 饿了
//学生响应信号Student st 处理信号的槽函数 请客吃饭
one::one(QWidget *parent)
: QWidget(parent)
{
zt = new Teacher(this);
st = new Student(this);
//连接 老师和学生
connect(zt,&Teacher::hungry,st,&Student::treat );
classIsOver();
}
one::~one()
{
}
void one::classIsOver()
{
//触发老师饿了的信号
emit zt->hungry();
}
//2) Student.h header file
#ifndef STUDENT_H
#define STUDENT_H
#include <QObject>
class Student : public QObject
{
Q_OBJECT
public:
explicit Student(QObject *parent = 0);
signals:
public slots:
//自定义槽函数
//槽函数和信号匹配
void treat();
};
#endif // STUDENT_H
//Student source file Student.cpp
#include "student.h"
#include <QDebug>
Student::Student(QObject *parent) :
QObject(parent)
{
}
void Student::treat()
{
qDebug()<<"请老师吃饭";
}
//3) Teacher class header file Student.h
#ifndef TEACHER_H
#define TEACHER_H
#include <QObject>
class Teacher : public QObject
{
Q_OBJECT
public:
explicit Teacher(QObject *parent = 0);
signals:
//自定义的信号，需要写到signals下
//返回类型必须为空，信号只需要声明，不需要实现
//信号可以有参数，可以重载
void hungry();
public slots:
};
#endif // TEACHER_H
//Teacher source file Student.cpp
#include "teacher.h"
Teacher::Teacher(QObject *parent) :
QObject(parent)
{
}
The effect is as follows:
