在Qt中,“signals”是“protected”的同义词。但它有助于MOC生成必要的代码。因此,如果您需要使用某些信号的接口-应将它们声明为虚拟抽象受保护方法。 MOC将生成所有必要的代码-您可以看到细节,即“emit somesignal”将被替换为具有相同名称的受保护方法的虚拟调用。请注意,该方法的主体也由Qt生成。
更新:
示例代码:
MyInterfaces.h
#pragma once
struct MyInterface1
{
signals:
virtual void event1() = 0;
};
struct MyInterface2
{
signals:
virtual void event2() = 0;
};
MyImpl.h
#ifndef MYIMPL_H
#define MYIMPL_H
#include <QObject>
#include "MyInterfaces.h"
class MyImpl
: public QObject
, public MyInterface1
, public MyInterface2
{
Q_OBJECT
public:
MyImpl( QObject *parent );
~MyImpl();
void doWork();
signals:
void event1();
void event2();
};
class MyListner
: public QObject
{
Q_OBJECT
public:
MyListner( QObject *parent );
~MyListner();
public slots:
void on1();
void on2();
};
#endif
MyImpl.cpp
#include "MyImpl.h"
#include <QDebug>
MyImpl::MyImpl(QObject *parent)
: QObject(parent)
{}
MyImpl::~MyImpl()
{}
void MyImpl::doWork()
{
emit event1();
emit event2();
}
MyListner::MyListner( QObject *parent )
{}
MyListner::~MyListner()
{}
void MyListner::on1()
{
qDebug() << "on1";
}
void MyListner::on2()
{
qDebug() << "on2";
}
主程序.cpp
#include <QCoreApplication>
#include "MyImpl.h"
int main( int argc, char *argv[] )
{
QCoreApplication a( argc, argv );
MyImpl *invoker = new MyImpl( NULL );
MyListner *listner = new MyListner( NULL );
MyInterface1 *i1 = invoker;
MyInterface2 *i2 = invoker;
QObject::connect( dynamic_cast< QObject * >( i1 ), SIGNAL( event1() ), listner, SLOT( on1() ) );
QObject::connect( dynamic_cast< QObject * >( i2 ), SIGNAL( event2() ), listner, SLOT( on2() ) );
invoker->doWork();
return a.exec();
}
signals: void someThingHappened();
。不需要实现信号的功能。 - Ruu