QT基础【5-信号与槽】

connect(ui->element_name, SlGNAL(clicked), this, slot(function()));

connect(ui.element_name,&QPushButton::clicked, this,&Widget::func_name);

#include "widget.h"
#include "ui_widget.h"
#include<QMessageBox>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(btn_click())); //QT4的写法;
    connect(this->ui->pushButton,&QPushButton::clicked,this,&Widget::btn_click); //Qt5的写法;
    //解释：将按钮点击事件绑定到名为pushButton的ui控件上，当该控件发生点击事件时，会运行btn_click函数。
}
Widget::~Widget()
{
    delete ui;
}
void Widget::btn_click(){
    QMessageBox::information(this,"title","push");
}

#include "sigslot.h"
#include<iostream>
using namespace std;
class window { //发送信号的类
public:
  //定义一些信号
  sigslot::signal0<>sig_button_click;
  sigslot::signal1<int>sig_print;
  //在sibgslot中，signal0表示不带任何参数的信号，signal1表示带一个参数的信号
};
class handle_signal :public sigslot::has_slots<> { //处理信号的类
public:
  void handle_button_click_sig() {
    cout << "按钮点击信号被调用" << endl;
  }
  void handle_print_sig(int val1) {
    cout << "打印信号被发送，值为：" << val1 << endl;
  }
};
int main() {
  window w;
  handle_signal handle;
  w.sig_button_click.connect(&handle, &handle_signal::handle_button_click_sig);
  w.sig_print.connect(&handle, &handle_signal::handle_print_sig);
  w.sig_button_click.emit(); //发送信号
  w.sig_print.emit(100); //发送信号
  return 0;
}