[Qt]自定义信号槽(2)
带参数的信号槽使用方法,重载的使用
1、新增信号槽发起类,teacher
#ifndef TEACHER_H #define TEACHER_H #include <QObject> class teacher : public QObject { Q_OBJECT public: teacher(QObject *parent = 0); signals: //自定义信号槽 //返回void //可以有参数,无参数 重载 void hungry(); //重载方法 传入吃的东西名称 void hungry(QString name); }; #endif // TEACHER_H
2、新增信号槽关联对象
#ifndef STUDENT_H #define STUDENT_H #include <QObject> class student: public QObject { // Q_OBJECT public: student(QObject *parent = 0); public slots: //早起QT必须写的此处,高级的可以在public下 //返回值void, 声明+实现 //可以有参数,无参数 重载 void eat(); //重载函数 吃啥 void eat(QString name); }; #endif // STUDENT_H
实现方法
#include "student.h" #include "QDebug" student::student(QObject *parent) : QObject(parent) { } void student::eat(){ qDebug() << "吃饭去"; } void student::eat(QString name){ qDebug() << "吃["+name+"]去"; }
3、主界面中关联信号槽
#include "widget.h" #include "teacher.h" #include "student.h" Widget::Widget(QWidget *parent) : QWidget(parent) { //初始化 this->stu =new student; this->teh = new teacher; //关联信号槽 //connect(teh,&teacher::hungry,stu,&student::eat); //关联带参数的信号槽 //函数指针->地址 void(teacher::*teacherSingler)(QString) = &teacher::hungry; void(student::*studentSlot)(QString) = &student::eat; connect(teh,teacherSingler,stu,studentSlot); this->start(); } void Widget::start(){ //触发信号槽 //emit this->teh->hungry(); emit this->teh->hungry("肉末茄子"); } Widget::~Widget() { }
运行结果: