How to get MainWindow of Application?

[rajeshs]

Hi all,


I am using Qt 4.3 , I want to get MainWindow of the particular Application?

How to do this?

[marcel]

Simple. Make a QMainWindow singleton subclass.

[rajeshs]

sorry , I want to get instance of mainwindow of the application from some other classes in the same application.

[marcel]

Yes, I know. And you should do it by implementing your QMainWindow subclass as a singleton.

[rajeshs]

we can make qMainWindow as singleton , how to get instance.:)

[marcel]

class MyWindow : public QMainWindow
{
private:
static MyWindow* instance;
protected:
MyWindow(QWidget* = NULL);
public:
static MyWindow* getInstance()
{
if(!instance)
{
instance = new MyWindow();
}
return instance;
}
};

and in the cpp don't forget to initialize the static member to NULL.

Next, you can use this in other classes just by including the MyWindow header:


#include "MyWindow.h"
...
MyWindow* mainWindow = MyWindow::getInstance();
...