JList TransferHandler Drag and Drop -- w/Autoscroll?
Hi everyone,
Just wondering if anyone has written a TransferHandler for a JList that permits drag and drop reordering, that will also autoscroll its parent JScrollPane if dragging to a boundary? Don't want to reinvent the wheel!
Thanks.
Alex
Rolled my own, [can see it here|http://forums.crm.saeven.net/blog.php?b=2]
Hope it helps.
Similar Messages
-
TransferHandler, Drag and Drop
Hi,
I implemented DnD in our application using the TransferHandler. This works quite well. But now I have a problem...
I have to change the action due to the target window. If I'm outside the source window I don't want the move, but I will show the copy cursor.
Changing the getSourceAction doesn't help, as the name says its only called in the beginning.
Does anyone have a solution for this?
Thanks
MarioRolled my own, [can see it here|http://forums.crm.saeven.net/blog.php?b=2]
Hope it helps. -
JList drag and drop to reorder items
I like to see a implementation of a JList supporting drag and drop to reorder items. The solution has to work with any object type in the datamodel.
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class ReorderList {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new ReorderList().makeUI();
public void makeUI() {
Object[] data = {"One", "Two", "Three", "Four", "Five",
"Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve"
DefaultListModel model = new DefaultListModel();
for (Object object : data) {
model.addElement(object);
JList list = new JList(model);
MouseAdapter listener = new ReorderListener(list);
list.addMouseListener(listener);
list.addMouseMotionListener(listener);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200, 200);
frame.add(new JScrollPane(list));
frame.setLocationRelativeTo(null);
frame.setVisible(true);
class ReorderListener extends MouseAdapter {
private JList list;
private int pressIndex = 0;
private int releaseIndex = 0;
public ReorderListener(JList list) {
if (!(list.getModel() instanceof DefaultListModel)) {
throw new IllegalArgumentException("List must have a DefaultListModel");
this.list = list;
@Override
public void mousePressed(MouseEvent e) {
pressIndex = list.locationToIndex(e.getPoint());
@Override
public void mouseReleased(MouseEvent e) {
releaseIndex = list.locationToIndex(e.getPoint());
if (releaseIndex != pressIndex && releaseIndex != -1) {
reorder();
@Override
public void mouseDragged(MouseEvent e) {
mouseReleased(e);
pressIndex = releaseIndex;
private void reorder() {
DefaultListModel model = (DefaultListModel) list.getModel();
Object dragee = model.elementAt(pressIndex);
model.removeElementAt(pressIndex);
model.insertElementAt(dragee, releaseIndex);
}edit Reduced a few LoC
Edited by: Darryl.Burke -
Drag and Drop issue in Jlist - Transferhandler not working
Hi all,
I have a problem associated with the drag and drop of components into a Jlist.
When I drag component out of a Jlist, the control reaches inside transfer handler, but when I try to insert a component into the Jlist, the control does not reach inside Jlist transfer handler.
jlist.setDropMode(DropMode.INSERT);
jlist.setDragEnabled(true);
jlist.setTransferHandler(new TransferHandler()
List fileList;
boolean export = false;
List<File> newList = null;
protected Transferable createTransferable(JComponent c)
System.out.println("inside handler");
..............................Please help me with this issue.
Any help in this regard will be well appreciated with dukes.
Regards,
AneesAneesAhamed wrote:
Hi all,
I have a problem associated with the drag and drop of components into a Jlist.
When I drag component out of a Jlist, the control reaches inside transfer handler, but when I try to insert a component into the Jlist, the control does not reach inside Jlist transfer handler.
jlist.setDropMode(DropMode.INSERT);
jlist.setDragEnabled(true);
jlist.setTransferHandler(new TransferHandler()
List fileList;
boolean export = false;
List<File> newList = null;
protected Transferable createTransferable(JComponent c)
System.out.println("inside handler");
..............................Please help me with this issue.
Any help in this regard will be well appreciated with dukes.If you're wondering why your createTransferable() method is not called when you drag from some other component and drop into the list it is because createTransferable() is called when you start dragging. So it would be the TransferHandler of the source component, not your target list, that has its createTransferable() called in that case.
When the list is the target of a drag&drop you should see the canImport() method of your TransferHandler being called. Do a System.out(0 in that method as well and see if that is the case. -
Hi,
I'm struggling with getting my program outfitted with a drag and drop function in and between a few JList components. (I'm using NetBeans IDE 6.7)
I have four JLists of which only one I want to enabled drag and drop rearrangement of the strings. Furthermore I would like to enable dragging from the other three lists into the rearrangeable list (which may be empty!).
I've searched for answers but I just can't manage to translate the answers on other forums into a usable solution for my program... I am relatively new to Java and NetBeans, so I would appreciate if you could keep the answers simple... (if possible).
What I know about this problem already:
- if i set dragEnabled to true, I can drag text into e.g. a TextField without further complicationsJTextComponents have preinstalled TransferHandlers that make it possible to simply call setDragEnabled(true) and you are good to go. However, with most other components, you need to install a custom TransferHandler (ie call list.setTransferHandler() ) to get the job done.
Here is a sample of the code you need: ListTransferHandler
ICE -
Hello,
I have two JLists, one containing music tracks (not actual tracks, just info like name, artist duration etc), and the other is a Playlist.
So I want to be able to drag items from the database of tracks (Jlist one) to the playlist (Jlist two).
I have looked how this is done and here is some of the code that I have:
//allow the mouse to drag and drop tracks
private class DragMouseAdapter extends MouseAdapter {
public void mousePressed(MouseEvent e) {
JComponent c = (JComponent)e.getSource();
TransferHandler handler = c.getTransferHandler();
handler.exportAsDrag(c, e, TransferHandler.COPY);
//allow tracks to be dragged and dropped
lstDatabase.setDragEnabled(true);
MouseListener listener = new DragMouseAdapter();
lstDatabase.addMouseListener(listener);
//allow tracks to be dragged and dropped
lstPlayList.addMouseListener(listener);
lstPlayList.setTransferHandler(new TransferHandler("text"));Nothing seems to happen
Any Ideas?
CheersThe swing tutorial on "How to Use Drag and Drop" has a working example using JLists:
http://java.sun.com/docs/books/tutorial/uiswing/misc/dnd.html#complex -
Hi there,
I have a problem with implementing Drag and Drop into my JList. As my class is a JPanel and there is a JList which is needed to have a drag and drop feature where it enable user to drag and drop to another JList. So I would like to ask how can i go about doin it without writing a new JList Class which implements the DropTargetListener, DragSourceListener, DragGestureListener to the JPanel.
Thanks...JTextComponents have preinstalled TransferHandlers that make it possible to simply call setDragEnabled(true) and you are good to go. However, with most other components, you need to install a custom TransferHandler (ie call list.setTransferHandler() ) to get the job done.
Here is a sample of the code you need: ListTransferHandler
ICE -
Autoscrolling in a DropTarget (Drag and Drop)
I have implemented Drag and Drop using DropTargets and a DragSource And DragGestureListener.
The DropTarget I have is a customized JComponent. How can I make the DropTarget autoscroll for Drag and Drop events??Have you tried adding a MouseMotionListener to the target component and checking to see if the mouse coordinates are near the edge of the viewable area?
-
Autoscrolling in the DropTarget (Drag and Drop)
I have implemented Drag and Drop using DropTargets and a DragSource And DragGestureListener.
The DropTarget I have is a customized JComponent. How can I make the DropTarget autoscroll for Drag and Drop events??Have you tried adding a MouseMotionListener to the target component and checking to see if the mouse coordinates are near the edge of the viewable area?
-
Drag and Drop items among JList
Hi,
I want to drag item from one JList and drop into another JList using JFrame in java Swing. Please provide me code for this.
Thanks
NitinYou need to implement a drag-and-drop (dnd) behaviour between your swing components.
Like most programming tasks it looks harder than it really is. Basically you need a DragSource and a DropTarget with a Transferable object in between. This Transferable object is the object from your list.
Here is Sun's tutorial on it... http://java.sun.com/docs/books/tutorial/dnd/
Good luck. -
1.4 Drag and Drop - lost icons when added my own TransferHandler
I've been trying to implement drag-and-drop using a custom TransferHandler on JDK 1.4.
When I use the system default TransferHandler, I get nice icons that indicate whether the drop is allowed or not. Once I implemented my own TransferHandler, all I get is a dim grey outline when I drag -- the icon doesn't change when I drag to an area where acceptDrag() is being called versus one where rejectDrag() is being called. (I've got println's in the code so I can verify the accept/reject calls are happening, but the icon never changes).
It would be extra nice if the icon indicated whether a COPY or MOVE operation was selected, and toggled the icon appropriately.
From other messages in this forum, it appears that the getVisualRepresentation() method of TransferHandler is never called, so that would not help.
I don't really need customized behavior here; I'm just trying to get back the behavior I saw with the default TransferHandler. Any suggestions?
Thanks!
Mike YawnI've been trying to implement drag-and-drop using a custom TransferHandler on JDK 1.4.
When I use the system default TransferHandler, I get nice icons that indicate whether the drop is allowed or not. Once I implemented my own TransferHandler, all I get is a dim grey outline when I drag -- the icon doesn't change when I drag to an area where acceptDrag() is being called versus one where rejectDrag() is being called. (I've got println's in the code so I can verify the accept/reject calls are happening, but the icon never changes).
It would be extra nice if the icon indicated whether a COPY or MOVE operation was selected, and toggled the icon appropriately.
From other messages in this forum, it appears that the getVisualRepresentation() method of TransferHandler is never called, so that would not help.
I don't really need customized behavior here; I'm just trying to get back the behavior I saw with the default TransferHandler. Any suggestions?
Thanks!
Mike Yawn -
How to handle (drag and drop) and Action Event in a JList?
I am having many JList,
On click of an element in JList I am loading a image in JSP.
But If I try to drag and drop one image from one bucket to another bucket Iam not getting any problem,
But I when I drag all the images from the target List to some other List and make the target List empty.
Now If I try to move the image from source list to the target list Iam getting this error,
Exception in thread "AWT-EventQueue-6" java.lang.NullPointerException
at pdfViewer.NewFileSegregater$24.valueChanged(NewFileSegregater.java:1944)
at javax.swing.JList.fireSelectionValueChanged(Unknown Source)
at javax.swing.JList$ListSelectionHandler.valueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.insertIndexInterval(Unknown Source)
at javax.swing.plaf.basic.BasicListUI$Handler.intervalAdded(Unknown Source)
at javax.swing.AbstractListModel.fireIntervalAdded(Unknown Source)
at javax.swing.DefaultListModel.addElement(Unknown Source)
at pdfViewer.NewFileSegregater.actionPerformed(NewFileSegregater.java:2918)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener$Actions.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.KeyboardManager.fireBinding(Unknown Source)
at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source)
at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Please help me how to solve this problem..Er, sure. In the class pdfViewer.NewFileSegregater on line
1944 (!), in the valueChanged() method, something is pointing to
null.
That method is being called from
pdfViewer.NewFileSegregater.actionPerformed() on line
2918 (!!).
Of course, none of us know what's going on in those code
segements but you. And for the record, that's not how to spell
Segregator. -
Drag and Drop an email from OutLook to JList.
Hi All,
Can anyone of you please guide me on how to implement drag and drop an email from microsoft outlook to JList.
Thanks in advance.!
AmitIt might just be Microsoft not using standards? I remember having a similar situation - I had an application that could have a zip entry fron 7-zip drag-and-dropped into it (came over as plain text, or maybe an InputStream, can't remember), but when you drill into a zip file with Windows (Vista at least), and try to drag-and-drop a zip entry from Windows Explorer, Java shows no dataflavors available. I just assumed Microsoft wasn't exporting the zip entry in any standard format (such as plain text).
Sorry, I know that wasn't very helpful, just thought I'd share a similar experience. :) -
How to outline selected cells during drag and drop in the jtable
Hi,
I have spent a lot of time to find out how to outline selected cells during drag in the jtable, but I did not find the answer.
Can anybody give me a tip, where to read more about this problem or even better, give an example...
I have the following situation:
1.Table has 10 rows and 10 columns
2.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION) and setCellSelectionEnabled(true)
3.user select 5 cells in 4th row (for example cell45,cell46,cell47,cell48 and cell49)
4.user starts dragging. During dragging an outline should be drawn. Outline should be a rectangular with width of 5 cells and height of one cell. Outline should move according to the mouse position.
5.rectangular disappears when dropped
Regards,
PrimozIn "createTransferable" you can create a drag image
which you can paint in "dragOver" and clear in "drop" method of DropTarget :
package dnd;
* DragDropJTableCellContents.java
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
public class DragDropJTableCellContents extends JFrame {
public DragDropJTableCellContents() {
setTitle("Drag and Drop JTable");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().add(createTable("JTable"), BorderLayout.CENTER);
setSize(400, 300);
setLocationRelativeTo(null);
private JPanel createTable(String tableId) {
DefaultTableModel model = new DefaultTableModel();
for (int i = 0; i < 10; i++) {
model.addColumn("Column "+i);
for (int i = 0; i < 10; i++) {
String[] rowData = new String[10];
for (int j = 0; j < 10; j++) {
rowData[j] = tableId + " " + i + j;
model.addRow(rowData);
JTable table = new JTable(model);
table.getTableHeader().setReorderingAllowed(false);
table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
table.setCellSelectionEnabled(true);
JScrollPane scrollPane = new JScrollPane(table);
table.setDragEnabled(true);
TableTransferHandler th = new TableTransferHandler();
table.setTransferHandler(th);
table.setDropTarget(new TableDropTarget(th));
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
JPanel panel = new JPanel(new BorderLayout());
panel.add(scrollPane);
panel.setBorder(BorderFactory.createTitledBorder(tableId));
return panel;
public static void main(String[] args) {
new DragDropJTableCellContents().setVisible(true);
abstract class StringTransferHandler extends TransferHandler {
public int dropAction;
protected abstract String exportString(JComponent c);
protected abstract void importString(JComponent c, String str);
@Override
protected Transferable createTransferable(JComponent c) {
return new StringSelection(exportString(c));
@Override
public int getSourceActions(JComponent c) {
return COPY;
@Override
public boolean importData(JComponent c, Transferable t) {
if (canImport(c, t.getTransferDataFlavors())) {
try {
String str = (String) t.getTransferData(DataFlavor.stringFlavor);
importString(c, str);
return true;
} catch (UnsupportedFlavorException ufe) {
} catch (IOException ioe) {
return false;
@Override
public boolean canImport(JComponent c, DataFlavor[] flavors) {
for (int ndx = 0; ndx < flavors.length; ndx++) {
if (DataFlavor.stringFlavor.equals(flavors[ndx])) {
return true;
return false;
class TableTransferHandler extends StringTransferHandler {
private int dragRow;
private int[] dragColumns;
private BufferedImage[] image;
private int row;
private int[] columns;
public JTable target;
@Override
protected Transferable createTransferable(JComponent c) {
JTable table = (JTable) c;
dragRow = table.getSelectedRow();
dragColumns = table.getSelectedColumns();
createDragImage(table);
return new StringSelection(exportString(c));
protected String exportString(JComponent c) {
JTable table = (JTable) c;
row = table.getSelectedRow();
columns = table.getSelectedColumns();
StringBuffer buff = new StringBuffer();
for (int j = 0; j < columns.length; j++) {
Object val = table.getValueAt(row, columns[j]);
buff.append(val == null ? "" : val.toString());
if (j != columns.length - 1) {
buff.append(",");
return buff.toString();
protected void importString(JComponent c, String str) {
target = (JTable) c;
DefaultTableModel model = (DefaultTableModel) target.getModel();
String[] values = str.split("\n");
int colCount = target.getSelectedColumn();
int max = target.getColumnCount();
for (int ndx = 0; ndx < values.length; ndx++) {
String[] data = values[ndx].split(",");
for (int i = 0; i < data.length; i++) {
String string = data;
if(colCount < max){
model.setValueAt(string, target.getSelectedRow(), colCount);
colCount++;
public BufferedImage[] getDragImage() {
return image;
private void createDragImage(JTable table) {
if (dragColumns != null) {
try {
image = new BufferedImage[dragColumns.length];
for (int i = 0; i < dragColumns.length; i++) {
Rectangle cellBounds = table.getCellRect(dragRow, i, true);
TableCellRenderer r = table.getCellRenderer(dragRow, i);
DefaultTableModel m = (DefaultTableModel) table.getModel();
JComponent lbl = (JComponent) r.getTableCellRendererComponent(table,
table.getValueAt(dragRow, dragColumns[i]), false, false, dragRow, i);
lbl.setBounds(cellBounds);
BufferedImage img = new BufferedImage(lbl.getWidth(), lbl.getHeight(),
BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D graphics = img.createGraphics();
graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f));
lbl.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));
lbl.paint(graphics);
graphics.dispose();
image[i] = img;
} catch (RuntimeException re) {
class TableDropTarget extends DropTarget {
private Insets autoscrollInsets = new Insets(20, 20, 20, 20);
private Rectangle rect2D = new Rectangle();
private TableTransferHandler handler;
public TableDropTarget(TableTransferHandler h) {
super();
this.handler = h;
@Override
public void dragOver(DropTargetDragEvent dtde) {
handler.dropAction = dtde.getDropAction();
JTable table = (JTable) dtde.getDropTargetContext().getComponent();
Point location = dtde.getLocation();
int row = table.rowAtPoint(location);
int column = table.columnAtPoint(location);
table.changeSelection(row, column, false, false);
paintImage(table, location);
autoscroll(table, location);
super.dragOver(dtde);
public void dragExit(DropTargetDragEvent dtde) {
clearImage((JTable) dtde.getDropTargetContext().getComponent());
super.dragExit(dtde);
@Override
public void drop(DropTargetDropEvent dtde) {
Transferable data = dtde.getTransferable();
JTable table = (JTable) dtde.getDropTargetContext().getComponent();
clearImage(table);
handler.importData(table, data);
super.drop(dtde);
private final void paintImage(JTable table, Point location) {
Point pt = new Point(location);
BufferedImage[] image = handler.getDragImage();
if (image != null) {
table.paintImmediately(rect2D.getBounds());
rect2D.setLocation(pt.x - 15, pt.y - 15);
int wRect2D = 0;
int hRect2D = 0;
for (int i = 0; i < image.length; i++) {
table.getGraphics().drawImage(image[i], pt.x - 15, pt.y - 15, table);
pt.x += image[i].getWidth();
if (hRect2D < image[i].getHeight()) {
hRect2D = image[i].getHeight();
wRect2D += image[i].getWidth();
rect2D.setSize(wRect2D, hRect2D);
private final void clearImage(JTable table) {
table.paintImmediately(rect2D.getBounds());
private Insets getAutoscrollInsets() {
return autoscrollInsets;
private void autoscroll(JTable table, Point cursorLocation) {
Insets insets = getAutoscrollInsets();
Rectangle outer = table.getVisibleRect();
Rectangle inner = new Rectangle(outer.x + insets.left,
outer.y + insets.top,
outer.width - (insets.left + insets.right),
outer.height - (insets.top + insets.bottom));
if (!inner.contains(cursorLocation)) {
Rectangle scrollRect = new Rectangle(cursorLocation.x - insets.left,
cursorLocation.y - insets.top,
insets.left + insets.right,
insets.top + insets.bottom);
table.scrollRectToVisible(scrollRect);
Edited by: Andre_Uhres on Nov 18, 2007 10:03 PM -
Drag and Drop of cell content between 2 tables
Hi Guys,
Iam into implementing drag and drop of cell contents between 2 different tables,say Table1 and Table2.(Iam not dragging and dropping rows or cells,Just copying the content of one cell to another).
Have extended the java tutorial class "TableTransferHandler" and "StringTransferHandler" under http://java.sun.com/docs/books/tutorial/uiswing/examples/dnd/index.html#ExtendedDndDemo to satisfy my needs.
The drag is enabled for Table1 and table2 as follows.
jTable1.setDragEnabled(true);
jTable1.setTransferHandler(new TableTransferHandler());
jTable2.setDragEnabled(true);
jTable2.setTransferHandler(new TableTransferHandler());
Dont be taken aback with the code I have put.It just to show what I have done..
My questions are put at the end of the post..
//String Transfer Handler class.
public abstract class StringTransferHandler extends TransferHandler {
protected abstract String exportString(JComponent c);
protected abstract void importString(JComponent c, String str);
protected abstract void cleanup(JComponent c, boolean remove);
protected Transferable createTransferable(JComponent c) {
return new StringSelection(exportString(c));
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
public boolean importData(JComponent c, Transferable t) {
if (canImport(c, t.getTransferDataFlavors())) {
try {
String str = (String)t.getTransferData(DataFlavor.stringFlavor);
importString(c, str);
return true;
} catch (UnsupportedFlavorException ufe) {
} catch (IOException ioe) {
return false;
protected void exportDone(JComponent c, Transferable data, int action) {
cleanup(c, action == MOVE);
public boolean canImport(JComponent c, DataFlavor[] flavors) {
JTable table = (JTable)c;
int selColIndex = table.getSelectedColumn();
for (int i = 0; i < flavors.length; i++) {
if ((DataFlavor.stringFlavor.equals(flavors))&& (selColIndex !=0)) {
return true;
return false;
}//TableTransferHandler classpublic class TableTransferHandler extends StringTransferHandler {
private int[] rows = null;
private int addIndex = -1; //Location where items were added
private int addCount = 0; //Number of items added.
protected String exportString(JComponent c) {
JTable table = (JTable)c;
rows = table.getSelectedRows();
StringBuffer buff = new StringBuffer();
int selRowIndex = table.getSelectedRow();
int selColIndex = table.getSelectedColumn();
String val = table.getValueAt(selRowIndex,selColIndex).toString();
buff.append(val);
return buff.toString();
protected void importString(JComponent c, String str) {
JTable target = (JTable)c;
DefaultTableModel model = (DefaultTableModel)target.getModel();
//int index = target.getSelectedRow();
int row = target.getSelectedRow();
int column = target.getSelectedColumn();
target.setValueAt(str, row, column);
protected void cleanup(JComponent c, boolean remove) {
}Now I want to put in the following functionality into my program...
[1]prevent dragging and dropping text in to the same table.That means I dont want to drag a cell content from Table1 and drop to another cell in Table1. Want to drag and drop cell content only from Table1 to Table2.
[2]Change cursor on a un-defined Target. That means how to prevent a drag from a particular column in Table1.Also how to prevent a drop to a particular column in Table2. How to change the cursor to a "NO-DRAG" cursoror "NO-DROP" cursor.
Could it be done using Drag Source Listener and drop Target Listener?.
If yes,How can these listeners attached to the table and how to do it?
If No,How Could it be done?
[3]Want to change the background colour of the cell being dragged and also the background colour of the target cell where the drop is made...
[4]Is there any out of the box way to make an undo in the target cell(where drop was made) so that the old cell value is brought back.
How can I extend my code to take care of the above said things.
Any help or suggestions is greatly appreciated.....
Edited by: Kohinoor on Jan 17, 2008 10:58 AMHi Guys,
Iam into implementing drag and drop of cell contents between 2 different tables,say Table1 and Table2.(Iam not dragging and dropping rows or cells,Just copying the content of one cell to another).
Have extended the java tutorial class "TableTransferHandler" and "StringTransferHandler" under http://java.sun.com/docs/books/tutorial/uiswing/examples/dnd/index.html#ExtendedDndDemo to satisfy my needs.
The drag is enabled for Table1 and table2 as follows.
jTable1.setDragEnabled(true);
jTable1.setTransferHandler(new TableTransferHandler());
jTable2.setDragEnabled(true);
jTable2.setTransferHandler(new TableTransferHandler());
Dont be taken aback with the code I have put.It just to show what I have done..
My questions are put at the end of the post..
//String Transfer Handler class.
public abstract class StringTransferHandler extends TransferHandler {
protected abstract String exportString(JComponent c);
protected abstract void importString(JComponent c, String str);
protected abstract void cleanup(JComponent c, boolean remove);
protected Transferable createTransferable(JComponent c) {
return new StringSelection(exportString(c));
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
public boolean importData(JComponent c, Transferable t) {
if (canImport(c, t.getTransferDataFlavors())) {
try {
String str = (String)t.getTransferData(DataFlavor.stringFlavor);
importString(c, str);
return true;
} catch (UnsupportedFlavorException ufe) {
} catch (IOException ioe) {
return false;
protected void exportDone(JComponent c, Transferable data, int action) {
cleanup(c, action == MOVE);
public boolean canImport(JComponent c, DataFlavor[] flavors) {
JTable table = (JTable)c;
int selColIndex = table.getSelectedColumn();
for (int i = 0; i < flavors.length; i++) {
if ((DataFlavor.stringFlavor.equals(flavors))&& (selColIndex !=0)) {
return true;
return false;
}//TableTransferHandler classpublic class TableTransferHandler extends StringTransferHandler {
private int[] rows = null;
private int addIndex = -1; //Location where items were added
private int addCount = 0; //Number of items added.
protected String exportString(JComponent c) {
JTable table = (JTable)c;
rows = table.getSelectedRows();
StringBuffer buff = new StringBuffer();
int selRowIndex = table.getSelectedRow();
int selColIndex = table.getSelectedColumn();
String val = table.getValueAt(selRowIndex,selColIndex).toString();
buff.append(val);
return buff.toString();
protected void importString(JComponent c, String str) {
JTable target = (JTable)c;
DefaultTableModel model = (DefaultTableModel)target.getModel();
//int index = target.getSelectedRow();
int row = target.getSelectedRow();
int column = target.getSelectedColumn();
target.setValueAt(str, row, column);
protected void cleanup(JComponent c, boolean remove) {
}Now I want to put in the following functionality into my program...
[1]prevent dragging and dropping text in to the same table.That means I dont want to drag a cell content from Table1 and drop to another cell in Table1. Want to drag and drop cell content only from Table1 to Table2.
[2]Change cursor on a un-defined Target. That means how to prevent a drag from a particular column in Table1.Also how to prevent a drop to a particular column in Table2. How to change the cursor to a "NO-DRAG" cursoror "NO-DROP" cursor.
Could it be done using Drag Source Listener and drop Target Listener?.
If yes,How can these listeners attached to the table and how to do it?
If No,How Could it be done?
[3]Want to change the background colour of the cell being dragged and also the background colour of the target cell where the drop is made...
[4]Is there any out of the box way to make an undo in the target cell(where drop was made) so that the old cell value is brought back.
How can I extend my code to take care of the above said things.
Any help or suggestions is greatly appreciated.....
Edited by: Kohinoor on Jan 17, 2008 10:58 AM
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