How to use separate threads for pushbuttons in QT (like SwingWorker in Java)

[artt]

I need to realize several buttons (as well as Qlabels, QtextEdit) in QWidget.
But I need to do it non-lockable, so if it is executinh a long time, it should be not hanging.
In java it works very fine with SwingWorker class, but not with Runnable.
So I need to know what analog I need to use in Qt.
Here is excerpts from java code. As it is very compact so I need to follow it in Qt but with local
classes:

class Writefile extends SwingWorker {//Declaration of custom thread class
  public Object doInBackground() {
   XMLCreator.stax();//class and method that realize XML writing to file.
   return null;
  }
 
   writetofile.addActionListener(new ActionListener() { //adding listener to button
         public void actionPerformed(ActionEvent e) {
            //XMLCreator.stax();
            Writefile process = new Writefile(); //initizalization of swingworjer class
            process.execute(); //starting separate task in separate thread
         }
      });

class Writefile extends SwingWorker {//Declaration of custom thread class
  public Object doInBackground() {
   XMLCreator.stax();//class and method that realize XML writing to file.
   return null;
  }

   writetofile.addActionListener(new ActionListener() { //adding listener to button
         public void actionPerformed(ActionEvent e) {
            //XMLCreator.stax();
            Writefile process = new Writefile(); //initizalization of swingworjer class
            process.execute(); //starting separate task in separate thread
         }
      });

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So how should I use

Qtobject::connect(writebutton,SIGNAL(clicked()), this, SLOT(Filewalker::writetofile()));

Qtobject::connect(writebutton,SIGNAL(clicked()), this, SLOT(Filewalker::writetofile()));

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//The last is the slot declared in Filewalker class header