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;
   }
};

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

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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();
...

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

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