import java.applet.Applet;
import java.awt.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import java.io.*;

public class DnDTest extends Frame implements DragGestureListener, DragSourceListener, 
					      DropTargetListener {
    private List dragList = new List();
    private List dropList = new List();
    
    private DragSource dragSource = new DragSource();
    
    //An object representing the component were the drop will take place.
    private DropTarget dropTarget = 
	new DropTarget(
		       dropList,  // The drop Component
		       DnDConstants.ACTION_COPY,  // actions on drop
		       this); // DropTargetListener
    
    //An object representing a drag gesture. In Windows that is
    //pressing the mouse and moving it. The given DragGestureListener
    //will be called when the user starts dragging.
    DragGestureRecognizer recognizer =
	dragSource.createDefaultDragGestureRecognizer(dragList,  // The Component where the drag starts.
						      DnDConstants.ACTION_COPY,  // actions on drop
						      this); // DragGestureListener
    
    public DnDTest() {
	super("Drag and Drop Test");
	
	dragList.add("one");
	dragList.add("two");
	dragList.add("three");
	dragList.add("four");
	dragList.add("five");
	dragList.add("six");
	
	setLayout(new GridLayout(2,0));
	add(new Label("Drag Source"));
	add(dragList);
	add(new Label("Drop Target"));
	add(dropList);
    }
    
    public static void main(String[] args) {
	Frame f = new DnDTest();
	f.setBounds(300,300,200,175);
	f.setVisible(true);
	
	f.addWindowListener (new WindowAdapter() {
		public void windowClosing(WindowEvent e) {
        	    System.exit(0);
		}
	    });			
    }
    
    public void dragGestureRecognized(DragGestureEvent e) {
	System.out.println("drag gesture recognized");
	//This method is called when the user starts dragging.
	String selectedItem = dragList.getSelectedItem();
	
	//Start the drag by calling the startDrag() method.
	e.startDrag(
		    DragSource.DefaultCopyDrop,  // cursor
		    new StringSelection(selectedItem), // transferable
		    this); // DragSourceListener
    }
    
    public void dragDropEnd(DragSourceDropEvent e) {
	System.out.println("source drag drop end");
    }
    
    public void dragEnter(DragSourceDragEvent e) {
	System.out.println("source drag enter");
    }
    
    public void dragExit(DragSourceEvent e) {
	System.out.println("source drag exit");
    }
    
    public void dragOver(DragSourceDragEvent e) {
	System.out.println("source drag over");
    }
    
    public void dropActionChanged(DragSourceDragEvent e) {
	System.out.println("source drop action changed");
    }
    
    public void dragEnter(DropTargetDragEvent e) {
	System.out.println("target drag enter");
	//The user has entered this component.
    }
    
    public void drop(DropTargetDropEvent e) {
	System.out.println("target drop");
	//The user has dropped in this component.
	try {
	    //If the dropped object is of the right flavor, we
	    //get it and place it in the list.
	    if(e.isDataFlavorSupported(DataFlavor.stringFlavor)){
		Transferable tr = e.getTransferable();
		
		e.acceptDrop (DnDConstants.ACTION_COPY);
		
		String s = (String)tr.getTransferData (DataFlavor.stringFlavor);
		dropList.add(s);
		e.dropComplete(true);
	    } else {
		e.rejectDrop();
	    }
	} 
	catch (IOException io) {
	    io.printStackTrace();
	    e.rejectDrop();
	} 
	catch (UnsupportedFlavorException ufe) {
	    ufe.printStackTrace();
	    e.rejectDrop();
	}
    }
    public void dragExit(DropTargetEvent e) {
	System.out.println("target drag exit");
    }
    
    public void dragOver(DropTargetDragEvent e) {
	System.out.println("target drag over");
    }
    
    public void dropActionChanged(DropTargetDragEvent e) {
	System.out.println("target drop action changed");
    }
}