Look at the primary code:

JPanel panel=new JPanel();

JSelfCreat jsc;
............
panel.add(jsc);
............


JScrollPane jsp=new JScrollPane();
jsp.getViewport().add(panel);


Now the problem is that when mouse dragged from the self created componnent, the Viewport of jsp auto go to the top of the panel. I hope when the mouse dragged, the viewport of jsp is fixed. So how to solve it? Is there any existed API supportint it?

Thanks