How to drag and drop button between two toolbar?

Question

Hi,everybody :)
i hava a problem :
if i have two toolbar in a frame , and there are some button in each, how can i use dnd package to drag and drop button between two toolbar,such as drag one button in a toolbar to the other toolbar ,i write some sample code ,but find some difficult to finish
can anyone give me some example code?
Thanks!

Answer 1

hi:)
i have done it ,but there is another problem ,after i finish drag the button and drop it into the toolbar,if my mouse across the dragged button ,it will change the color ,can i setup any mathod to disappear the side_effect?
thank u
click open to show the other frame
and the code is as follows:
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class buttondrag implements DragGestureListener, DragSourceListener,
DropTargetListener, Transferable{
static JFrame source = new JFrame("Source Frame");
static JFrame target = new JFrame("Target Frame");
static final DataFlavor[] supportedFlavors = { null };
static {
try {
     supportedFlavors[0] = new DataFlavor(DataFlavor.javaJVMLocalObjectMimeType);
catch (Exception ex) {
     ex.printStackTrace();
} Object object; // Transferable methods.
public Object getTransferData(DataFlavor flavor) {
if (flavor.isMimeTypeEqual(DataFlavor.javaJVMLocalObjectMimeType)) return object;
else{
return null;
public DataFlavor[] getTransferDataFlavors() {
     return supportedFlavors;
public boolean isDataFlavorSupported(DataFlavor flavor) {
     return flavor.isMimeTypeEqual(DataFlavor.javaJVMLocalObjectMimeType);
} // DragGestureListener method.
public void dragGestureRecognized(DragGestureEvent ev) {
ev.startDrag(null, this, this);
} // DragSourceListener methods.
public void dragDropEnd(DragSourceDropEvent ev) { }
public void dragEnter(DragSourceDragEvent ev) { }
public void dragExit(DragSourceEvent ev) { }
public void dragOver(DragSourceDragEvent ev) {
     object = ev.getSource();
public void dropActionChanged(DragSourceDragEvent ev) { } // DropTargetListener methods.
public void dragEnter(DropTargetDragEvent ev) { }
public void dragExit(DropTargetEvent ev) { }
public void dragOver(DropTargetDragEvent ev) { dropTargetDrag(ev); }
public void dropActionChanged(DropTargetDragEvent ev) { dropTargetDrag(ev); }
void dropTargetDrag(DropTargetDragEvent ev) { ev.acceptDrag(ev.getDropAction()); }
public void drop(DropTargetDropEvent ev) {
     ev.acceptDrop(ev.getDropAction());
     try {
     Object target = ev.getSource();
     Object source = ev.getTransferable().getTransferData(supportedFlavors[0]);
     Component component = ((DragSourceContext) source).getComponent();
     Container oldContainer = component.getParent();
     Container container = (Container) ((DropTarget) target).getComponent();
     container.add(component);
     oldContainer.validate();
     oldContainer.repaint();
     container.validate();
     container.repaint();
     catch (Exception ex) {
          ex.printStackTrace();
          ev.dropComplete(true);
public static void main(String[] arg) {
JButton button = new JButton("Drag this button");
JToolBar sbar = new JToolBar();
JToolBar dbar = new JToolBar();
JButton open_button = new JButton("Open");
source.getContentPane().setLayout(null);
source.setSize(new Dimension(400, 300));
sbar.add(button);
sbar.setBounds(new Rectangle(0, 0, 400, 31));
sbar.add(open_button);
open_button.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
target.setVisible(true);
source.getContentPane() .add(sbar);
target.getContentPane().setLayout(null);
target.setSize(new Dimension(400, 300));
target.getContentPane().add(dbar);
dbar.setBounds(new Rectangle(0, 0, 400, 31));
dbar.add(new JButton("button1"));
buttondrag dndListener = new buttondrag();
DragSource dragSource = new DragSource();
DropTarget dropTarget1 = new DropTarget(sbar, DnDConstants.ACTION_MOVE, dndListener);
DropTarget dropTarget2 = new DropTarget(dbar, DnDConstants.ACTION_MOVE, dndListener);
DragGestureRecognizer dragRecognizer1 = dragSource.createDefaultDragGestureRecognizer(button, DnDConstants.ACTION_MOVE, dndListener);
source.setBounds(0, 200, 200, 200);
target.setVisible(false);
target.setBounds(220, 200, 200, 200);
source.show();
}