signals_slots.cpp

来自「自定义信号和槽的例子:应用于QT/X11版本为4.4.2,是QT开发核心实例介绍」· C++ 代码 · 共 38 行

#include <QApplication>
#include <iostream>
#include "signals_slots.h"

void Receiver::printNumber(int n)
{
    std::cout << "Recieved: " << n << std::endl;
}


void Mediator::doSend()
{
    emit send(5);
}

void Sender::doTransmit()
{
    emit transmit(10);
}
    
int main( int argc, char **argv )
{
    QApplication a( argc, argv );
    
    Receiver r;
    Mediator m;
    Sender s;
    
    QObject::connect(&s, SIGNAL(transmit(int)), &r, SLOT(printNumber(int)));
    QObject::connect(&s, SIGNAL(transmit(int)), &m, SIGNAL(send(int)));
    QObject::connect(&m, SIGNAL(send(int)), &r, SLOT(printNumber(int)));
    
    s.doTransmit();
    m.doSend();
    
    return 0;
}