How to select an item in a Jface TableViewer after a dialog becomes activated

Scenario : We have a Jface Dialog and a TableViewer or a TreeViewer on that dialog. after the dialog become active we want to select an item and want to fire the TableViewers selection listener.


Step 1. Add a selection listener to the TableViewer :

Note : You should do this in createDialogArea() method.

  getTableViewer().addSelectionChangedListener(new ISelectionChangedListener() {  
   @Override  
   public void selectionChanged(SelectionChangedEvent event) {  
   final Object selection = getSingleSelection(event.getSelection());  
   if (selection instanceof SomeObject) {  
    DoSomething();  
   }  
   }  
  });  
  }  

Step 2. Add a Shell Listner :(again in createDialogArea() method)

  getShell().addShellListener(new ShellAdapter()  
  {  
   @Override  
   public void shellActivated(ShellEvent e) {    
   super.shellActivated(e);  
   if (getLines().size()>0) {  
    getViewer().getControl().setFocus();  
    getTableViewer().setSelection(new StructuredSelection(get.getElementAt(0)),true);  
   }  
   }  
  });  

You are done ! now after the shell become active the first item of the TableViews will be selected and a selection listner will be fired . Enjoy!