QT signal transmission between multi-level objects signal transmission between multi-level nested class objects

One 、 First of all, demand ：

It may be the fifth floor , Or multilayer , Sub objects should send signals to the first layer , such , It's troublesome to write normally

Two 、 Solution :

Specially take Make a class , As a transit class , The transfer class is a single example ;

Subclass , Will signal Send to transit class , Transit class , Then send it to the class you want ;

Code up ：

Transit class ：

#ifndef TRANSMITSIGNALS_H
#define TRANSMITSIGNALS_H

#include <QObject>

class TransmitSignals : public QObject
{
    Q_OBJECT
public:
    static TransmitSignals &GetInstance();
private:
    TransmitSignals();
     ~TransmitSignals();

    TransmitSignals(const TransmitSignals &) = delete;
    TransmitSignals(const TransmitSignals &&) = delete;
    TransmitSignals &operator=(const TransmitSignals &) = delete;



signals:
    void sigReWriteOffsetRet(bool ret);
    void sigFreedDragRet(bool ret);
    void sigEndFreedDragRet(bool ret);

public slots:
};

#endif // TRANSMITSIGNALS_H

cpp

#include "transmitsignals.h"

TransmitSignals::TransmitSignals( )
{

}

TransmitSignals::~TransmitSignals( )
{

}
TransmitSignals& TransmitSignals::GetInstance()
{
    static TransmitSignals RobotControl;
    return RobotControl;
}

Want to go to college signal The object of

#include "form.h"
#include "ui_form.h"
#include "transmitsignals.h"
Form::Form(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);

    connect(this, SIGNAL(send_test(bool)),&TransmitSignals::GetInstance(), SIGNAL(sigReWriteOffsetRet(bool)) );
}

Form::~Form()
{
    delete ui;
}

void Form::on_pushButton_clicked()
{
    emit send_test(true);
}

The object receiving the signal

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMovie>
#include <QDebug>
#include "transmitsignals.h"
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    connect(&TransmitSignals::GetInstance(), SIGNAL(sigReWriteOffsetRet(bool)), this, SLOT(on_test_signal(bool)));
}

MainWindow::~MainWindow()
{
    delete ui;
}

 void MainWindow::on_test_signal(bool ret)
 {
     qDebug()<<"on_pushButton_clicked";
 }
void MainWindow::on_pushButton_clicked()
{
   mForm.show();
}

such , No matter how many floors , In fact, it is no different from the second floor ;