Java - Dragg Undecorated Window

Handy script for dragging undecorated window (JFrame)

/***********************************************************************************************
* DRAG UNDECORATED WINDOW CLASS
*
* @author Stanislav Zorjan
* @copyright (c)Copyright 2007 - 2008 - Stanislav Zorjan newcomponents@neobee.net
*
* As the name of the class says, this class drags undecorated or decorated window (JFrame)
* Create new instance of the class and than call "onPress" method with "mousePressed" event
* and then "moveWindow" with "mouseDragged" event.
*/
/***********************************************************************************************/
/*change package name to Your package name*/
package draggwindow;
import javax.swing.JFrame;

public class DragUndecoratedWindow {
	
    private int x1;
    private int y1;
    private int x2;
    private int y2;
	
    private int positionx;
    private int positiony;
	
    private JFrame frame;
	DragUndecoratedWindow(JFrame frame) {
		this.frame = frame;
	}
        
        public void moveWindow(java.awt.event.MouseEvent evt){
      		
        this.positionx = evt.getXOnScreen();
        this.positiony = evt.getYOnScreen();
        
		if(this.positionx > this.x1){
			this.x2 = this.positionx - this.x1;
			this.frame.setLocation(this.frame.getX() + this.x2, this.frame.getY());
		}else if(this.positionx < this.x1){
			this.x2 =  this.x1 - this.positionx;
			this.frame.setLocation(this.frame.getX() - this.x2, this.frame.getY());
		}
		if(this.positiony > this.y1){
			this.y2 = this.positiony - this.y1;
			this.frame.setLocation(this.frame.getX(), this.frame.getY() + this.y2);
		}else if(this.positiony < this.y1){
			this.y2 =  this.y1 - this.positiony;
			this.frame.setLocation(this.frame.getX(), this.frame.getY() - this.y2);
		}
		this.x1 = this.positionx;
		this.y1 = this.positiony;
        }
	
	
	public void onPress(java.awt.event.MouseEvent evt){
		this.x1 = evt.getXOnScreen();
		this.y1 = evt.getYOnScreen();
	}
}