How to show another window from mainwindow in QT

Question

Platform: QT, Windows XP I am new to Qt. I want to show another window(what to do to open it as dialog) from mainwindow. I did "add New Item ->Qt Designer Form Class", named it say MyWindow. But how to show this MyWindow from mainwindow ?

Answer 1

1. Implement a slot in your QMainWindow where you will open your new Window,
2. Place a widget on your QMainWindow,
3. Connect a signal from this Widget to a slot from the QMainWindow (For example: If the widget is a QPushButton connect the signal click() to the QMainWindow custom slot you have created).

Code example:

MainWindow.h

// ...
include "newwindow.h"
// ...
public slots:
   void openNewWindow();
// ...
private:
   NewWindow *mMyNewWindow;
// ...
}

MainWindow.cpp

// ...
   MainWindow::MainWindow()
   {
      // ...
      connect(mMyButton, SIGNAL(click()), this, SLOT(openNewWindow());
      // ...
   }
// ...
void MainWindow::openNewWindow()
{
   mMyNewWindow = new NewWindow(); // Be sure to destroy you window somewhere
   // ...
}

This is an example on how display a custom new window. There are a lot of way to do this.