QT 如何把信号放置到一个容器中

╰+攻爆jí腚メ 2022-09-09 10:58 141阅读 0赞

## 数学里有个孤独的词叫做：假设存在 ##

这里也假设存在这样一个场景：数据源根据不同的功能，将数据转发给不同的函数进行处理。该函数的参数类型和个数其实都是一致的，只是需要转发给不同的函数处理而已。

那么我们可以把类成员函数指针放到一个容器（vector或者map都行）中，通过索引或者KEY，来调用不同的成员函数。

### 头文件 ###

#pragma once
    #include <QtWidgets/QWidget>
    #include "ui_QtSingalContainer.h"
    
    
    class QtSingalContainerTest;
    //定义类成员函数指针类型(信号类型)
    using fun_int_string = void(QtSingalContainerTest::*)(int, QString);
    //typedef void(QtSingalContainerTest::* fun_int_string)(int, QString);
    
    class QtSingalContainerTest : public QWidget
    { 
        Q_OBJECT
    
    public:
        QtSingalContainerTest(QWidget *parent = Q_NULLPTR);
    	
    signals:
    	void signalIntString(int code, QString response);
    
    protected:
    	void slotIntString(int code, QString response);
    	void slotLogin(int code, QString response);
    	void slotLogout(int code, QString response);
    
    private:
        Ui::QtSingalContainerClass ui;
    	QMap<QString, fun_int_string> processer_;
    };

### 实现文件 ###

#include "QtSingalContainerTest.h"
    #include <QMessageBox>
    #include <QDebug>
    
    
    QtSingalContainerTest::QtSingalContainerTest(QWidget *parent)
        : QWidget(parent)
    { 
        ui.setupUi(this);
    
    	processer_ = 
    	{ 
    		{ "login", &QtSingalContainerTest::slotLogin},
    		{ "logout", &QtSingalContainerTest::slotLogout},
    		{ "signal", &QtSingalContainerTest::signalIntString},
    	};
    
    	//从容器中取出信号(类成员函数指针),发射信号(调用该成员函数)
    	connect(this, &QtSingalContainerTest::signalIntString, this, &QtSingalContainerTest::slotIntString);
    	emit (this->*processer_["signal"])(300, "unknown");
    
    	//直接调用函数指针
    	(this->*processer_["login"])(200, "success!");
    	(this->*processer_["logout"])(400, "failed!");
    }
    //
    void QtSingalContainerTest::slotIntString(int code, QString response)
    { 
    	qDebug() << "code=" << code << "response=" << response;
    	QString tip = QString("code=%1, response=%2").arg(code).arg(response);
    	QMessageBox::information(nullptr, "slotIntString", tip);
    }
    //
    void QtSingalContainerTest::slotLogin(int code, QString response)
    { 
    	qDebug() << "code=" << code << "response=" << response;
    	QString tip = QString("code=%1, response=%2").arg(code).arg(response);
    	QMessageBox::information(nullptr, "slotLogin", tip);
    }
    //
    void QtSingalContainerTest::slotLogout(int code, QString response)
    { 
    	qDebug() << "code=" << code << "response=" << response;
    	QString tip = QString("code=%1, response=%2").arg(code).arg(response);
    	QMessageBox::information(nullptr, "slotLogout", tip);
    }