67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
#include "widget3.h"
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Widget3::Widget3(QWidget *parent) : QWidget(parent)
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{
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setWindowTitle("自定义信号和槽");
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resize(800,640);
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stu = new Student();
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stu->setParent(this);
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techr = new Teacher(this);
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// 绑定无参信号
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void(Student:: *sleep1)() = &Student::sleep;
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void(Teacher:: *wakeup1)() = &Teacher::wake_up;
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connect(stu,sleep1,techr,wakeup1);
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// 绑定有参的信号和槽函数
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void(Student:: *sleep2)(const QString &,int n) = &Student::sleep;
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void(Teacher:: *wakeup2)(const QString &) = &Teacher::wake_up;
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connect(stu,sleep2,techr,wakeup2);
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// 手动发送一个信号
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// emit stu->sleep();
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// 点击按钮发送学生睡觉的信号
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QPushButton *btn = new QPushButton("我睡会",this);
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btn->resize(120,50);
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btn->move(20,20);
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QPushButton *btn2 = new QPushButton("再睡会",this);
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btn2->resize(120,50);
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btn2->move(20,90);
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edit = new QLineEdit(this);
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edit->resize(300,50);
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edit->move(20,160);
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// 将一个信号绑定到另一个信号上，即发送另一个信号
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// connect(btn,&QPushButton::clicked,stu,&Student::sleep);
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// connect(btn,&QPushButton::clicked,this,&Widget3::to_sleep);
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connect(btn, SIGNAL(clicked()) ,this,SLOT(to_sleep())); // QT4 的信号槽写法
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// connect(btn2,&QPushButton::clicked,this,&Widget3::to_sleep2);
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// Lambda表达式（匿名函数）
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// connect(btn,&QPushButton::clicked,[&](){
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// emit stu->sleep();
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// void(Student:: *sleep1)() = &Student::sleep;
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// void(Teacher:: *wakeup1)() = &Teacher::wake_up;
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// disconnect(stu,sleep1,techr,wakeup1);
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// });
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connect(btn2,&QPushButton::clicked,[&](){
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const QString msg = edit->text();
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emit stu->sleep(msg,2);
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});
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}
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void Widget3::to_sleep()
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{
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emit stu->sleep(); // 发送一个睡觉的信号
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}
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void Widget3::to_sleep2()
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{
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const QString &msg = edit->text();
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emit stu->sleep(msg,2);
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}
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