How to swap windows?

[RayBradbury]

This is a very simple question that I can't quite get my head around...

If I click a button in the mainwindow it will hide mainwindow then make a NewWindow and show it. If I click on NewWindow it will hide NewWindow and then unhide mainwindow....

Question is, how do I get NewWindow (which is a child of mainwindow, I think?) to access mainwindow and tell it to do something?

@#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

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

void MainWindow::on_Button_ToNew_clicked()
{
this->hide();
Instance1_NewWindow = new NewWindow(this);
Instance1_NewWindow->show();
}
@

No idea where to start in the NewWindow

@#include "newwindow.h"
#include "ui_newwindow.h"

#include "mainwindow.h"

NewWindow::NewWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::NewWindow)
{
ui->setupUi(this);
}

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

void NewWindow::on_Button_ToMain_clicked()
{

}
@

[qxoz]

Welcome to DevNet.

"Signals and slots":http://qt-project.org/doc/qt-5/signalsandslots.html will help you.

[ankursaxena]

U can do it using qsharedmemory .

[SGaist]

Why use something like QSharedMemory for that task ? Signals and Slots like qxoz suggested is the right way

[ankursaxena]

Ohk. I misunderstood the question. i understood that there should be only a single instance. Probably i haven't read out it clearly. sorry for inconvenience .