JTable inside JTable cell: drag and drop

Hello. I've table (let's call it ParentTable), which cells contain other table (NestedTable). NestedTable recieves all events (I can move cursor, select cells by mouse, scroll table). ParentTable have enabled Drag nad Drop (D'n'D). When no cells in NestedTable are selected D'n'D works fine. When I select some cell in NestedTable, D'n'D does't work � it forbids the operation. I think this is because NestedTable recieves D'n'D events, but D'n'D is disabled for it. How can I work around this? I don't want to enable D'n'D for each NestedTable (there are several reasons for this).
The question is � can I pass to NestedTable all events, except of D'n'D ones?

Yes, I use custom cell renderer and cell editor for ParentTable, which returns NestedTable.
DnD turned on for the ParentTable, so when the NestedTable is active (some cells selected in it) it receives DnD events, which are turned off for it, and DnD doesn't work.
Possible solution is to turn DnD for NestedTable (not for ParentTable), and i'll do this if it is impossible to make it work in current configuration.
So the question is � is this possible do not pass DnD event to NestedTable ?

Similar Messages

WebView inside JFXPanel: No drag and drop events received

Hi,
I'd like to manage Dnd between apps and a Swing application with a JFXPanel which embeds a WebView component.
Currently, all drops are forbidden on top of the WebView, and I'd like to find a way for the WebView to accept transferable object such as URL...
Moreover, code like this does not display anything in console. If I create a native JFX application (without JFXPanel Swing layer) the drag events occur.
 webView.setOnDragDetected(new EventHandler<MouseEvent>() {
 public void handle(MouseEvent event) {
 System.err.println(event.toString());
 webView.setOnDragEntered(new EventHandler<DragEvent>() {
 public void handle(DragEvent event) {
 System.err.println(event.toString());
 webView.setOnDragOver(new EventHandler<DragEvent>() {
 @Override
 public void handle(DragEvent event) {
 System.err.println(event.toString());
 webView.setOnDragDropped(new EventHandler<DragEvent>() {
 @Override
 public void handle(DragEvent event) {
 System.err.println(event.toString());
 });I guess JFXPanel catches events, or I missed something...
If anyone could help, thanks in advance!

Hi,
For people who can help, here is the entire code to reproduce the problem.
JFXPanel seems to consume the DND event, and the JFX WebView component does not receive anything.
Thanks a lot.
import java.awt.Dimension;
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.input.DragEvent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import javafx.scene.paint.Color;
import javafx.scene.web.WebView;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class WebViewInJFXPanel {
 private void initAndShowGUI() {
 // This method is invoked on Swing thread
 JFrame frame = new JFrame("WebView in JFXPanel");
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 final JFXPanel fxPanel = new JFXPanel();
 fxPanel.setOpaque(false);
 fxPanel.setPreferredSize(new Dimension(800,600));
 frame.add(fxPanel);
 frame.pack();
 frame.setVisible(true);
 // Init JFX
 Platform.runLater(new Runnable() {
 @Override
 public void run() {
 initFX(fxPanel);
 private void initFX(JFXPanel fxPanel) {
 // This method is invoked on JavaFX thread
 WebView webView = new WebView();
 webView.getEngine().load("http://javafx.com");
 // The following triggers are never invoked once in a JFXPanel
 webView.setOnDragEntered(new EventHandler<DragEvent>() {
 public void handle(DragEvent event) {
 System.err.println(event.toString());
 webView.setOnDragOver(new EventHandler<DragEvent>() {
 @Override
 public void handle(DragEvent event) {
 System.err.println(event.toString());
 Dragboard db = event.getDragboard();
 if (db.hasString()) {
 event.acceptTransferModes(TransferMode.COPY_OR_MOVE);
 event.consume();
 webView.setOnDragDropped(new EventHandler<DragEvent>() {
 @Override
 public void handle(DragEvent event) {
 System.err.println(event.toString());
 Dragboard db = event.getDragboard();
 boolean success = false;
 if (db.hasString()) {
 System.out.println("Dropped: " + db.getString());
 success = true;
 event.setDropCompleted(success);
 event.consume();
 Scene scene = new Scene(webView, 800, 650, Color.BLACK);
 scene.setFill(Color.BLACK);
 fxPanel.setScene(scene);
 public static void main(String[] args) {
 SwingUtilities.invokeLater(new Runnable() {
 @Override
 public void run() {
 new WebViewInJFXPanel().initAndShowGUI();
}

Drag and drop problem On Mac OS

Hi guys,
I have a java applet code running well on windows and Linux.it consists of dragging files from a JFileChooser and dropping them to a JTable.
But the drag and drop feature doesn't work on Mac OS platforms.I don't get any errors log .simply files don't get dropped to JTable.
In my code i simply use a TableTransferHandler registered on JTable and then setDragEnabled() for JFileChooser.
What can i do to make my code run correctly on Mac OS ?
thanks for helping

For those interested, I got drag and drop working on the Mac. I got some help on the Apple-Dev forums, but basically, if you want to do your own drag and drop on the Mac OSX, you must have your transfer handler support StringFlavor. If it doesn't, it will not work.

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,
Primoz

In "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

Must click then click and drag for JTable Drag and Drop

Hi All,
I've been using Java 1.4 to drag and drop data between two tables in our application. Basically I need to drag the data from individual rows of the source table and insert it into one of the cells in the new table. This works absolutely fine and has made a huge improvement to this portion of our app. I've included example source code below that does a similar thing by transferring data from one table and inserting it into another (it's quite big and also not as well done as the example in our real app but unfortunately I can't send the source for that).
The thing I've noticed though is that in order to start dragging data I need to click to select it and then press and hold the mouse button to start dragging, whereas under W**dows and just about every other OS you can just press and hold and start dragging straight away. If you try this with a JTable though it just changes the rows you have selected so the drag and drop works but feels a bit clunky and amateurish. I'd like to do something about this such that it works like Windows Explorer (or similar) where you can just press the mouse button and start dragging.
Any help would be greatly appreciated - and if anybody finds the code useful you're more than welcome to it. Note that the business end of this is CustomTransferHandler.java - this will show you how to insert data at a specific position in a JTable, it's a bit of a faff but not too bad once you've got it sussed.
Thanks,
Bart Read
===============================================================
TestFrame.java
* TestFrame.java
* Created on October 21, 2002, 4:59 PM
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.util.TooManyListenersException;
import javax.swing.*;
* @author readb
public class TestFrame extends javax.swing.JFrame
 private static final String [] NAMES = {
 "John", "Geoff", "Madeleine", "Maria", "Flanders",
 "Homer", "Marge", "Bart", "Lisa", "Weird Baby" };
 private JTable source;
 private JTable dest;
 private MyTableModel sourceModel;
 private MyTableModel destModel;
 private Clipboard clipboard;
 /** Creates a new instance of TestFrame */
 public TestFrame()
 clipboard = getToolkit().getSystemClipboard();
 Container c = getContentPane();
 c.setLayout( new BorderLayout( 40, 40 ) );
 source = new MyJTable();
 sourceModel = new MyTableModel();
 source.setModel( sourceModel );
 source.setDragEnabled( true );
 CustomTransferHandler handler = new CustomTransferHandler( "Source handler" );
 source.setTransferHandler( handler );
 try
 source.getDropTarget().addDropTargetListener( handler );
 catch ( TooManyListenersException tmle )
 tmle.printStackTrace();
 dest = new MyJTable();
 destModel = new MyTableModel();
 dest.setModel( destModel );
 dest.setDragEnabled( true );
 handler = new CustomTransferHandler( "Dest handler" );
 dest.setTransferHandler( handler );
 try
 dest.getDropTarget().addDropTargetListener( handler );
 catch ( TooManyListenersException tmle )
 tmle.printStackTrace();
 c.add( new JScrollPane( source ), BorderLayout.WEST );
 c.add( new JScrollPane( dest ), BorderLayout.EAST );
 populate();
 private void populate( MyTableModel model )
 for ( int index = 0; index < NAMES.length; ++index )
 model.setRow( index, new DataRow( index + 1, NAMES[ index ] ) );
 private void populate()
 populate( sourceModel );
 populate( destModel );
 public static void main( String [] args )
 TestFrame app = new TestFrame();
 app.addWindowListener(
 new WindowAdapter() {
 public void windowClosing( WindowEvent we )
 System.exit( 0 );
 app.pack();
 app.setSize( 1000, 600 );
 app.show();
 private class MyJTable extends JTable
 public boolean getScrollableTracksViewportHeight()
 Component parent = getParent();
 if (parent instanceof JViewport)
 return parent.getHeight() > getPreferredSize().height;
 return false;
}=====================================================================
MyTableModel.java
* MyTableModel.java
* Created on October 21, 2002, 4:43 PM
import java.util.ArrayList;
* @author readb
public class MyTableModel extends javax.swing.table.AbstractTableModel
 private static final int NUMBER = 0;
 private static final int NAME = 1;
 private static final String [] COLUMN_HEADINGS = { "Number", "Name" };
 private ArrayList data;
 /** Creates a new instance of MyTableModel */
 public MyTableModel()
 super();
 data = new ArrayList();
 public int getColumnCount()
 return COLUMN_HEADINGS.length;
 public String getColumnName( int index )
 return COLUMN_HEADINGS[ index ];
 public Class getColumnClass( int index )
 switch ( index )
 case NUMBER:
 return Integer.class;
 case NAME:
 return String.class;
 default:
 throw new IllegalArgumentException( "Illegal column index: " + index );
 public int getRowCount()
 return ( null == data ? 0 : data.size() );
 public Object getValueAt( int row, int column )
 DataRow dataRow = ( DataRow ) data.get( row );
 switch ( column )
 case NUMBER:
 return new Integer( dataRow.getNumber() );
 case NAME:
 return dataRow.getName();
 default:
 throw new IllegalArgumentException( "Illegal column index: " + column );
 public void addRow( DataRow row )
 int rowIndex = data.size();
 data.add( row );
 fireTableRowsInserted( rowIndex, rowIndex );
 public void addRows( DataRow [] rows )
 int firstRow = data.size();
 for ( int index = 0; index < rows.length; ++index )
 data.add( rows[ index ] );
 fireTableRowsInserted( firstRow, data.size() - 1 );
 public void setRow( int index, DataRow row )
 if ( index == data.size() )
 data.add( row );
 else
 data.set( index, row );
 fireTableRowsUpdated( index, index );
 public void insertRows( int index, DataRow [] rows )
 for ( int rowIndex = rows.length - 1; rowIndex >= 0; --rowIndex )
 data.add( index, rows[ rowIndex ] );
 fireTableRowsInserted( index, index + rows.length - 1 );
 public DataRow getRow( int index )
 return ( DataRow ) data.get( index );
 public DataRow removeRow( int index )
 DataRow retVal = ( DataRow ) data.remove( index );
 fireTableRowsDeleted( index, index );
 return retVal;
 public boolean removeRow( DataRow row )
 int index = data.indexOf( row );
 boolean retVal = data.remove( row );
 fireTableRowsDeleted( index, index );
 return retVal;
 public void removeRows( DataRow [] rows )
 for ( int index = 0; index < rows.length; ++index )
 data.remove( rows[ index ] );
 fireTableDataChanged();
}=====================================================================
DataRow.java
* DataRow.java
* Created on October 21, 2002, 4:41 PM
import java.io.Serializable;
* @author readb
public class DataRow implements Serializable
 private int number;
 private String name;
 /** Creates a new instance of DataRow */
 public DataRow( int number, String name )
 this.number = number;
 this.name = name;
 public int getNumber()
 return number;
 public String getName()
 return name;
 public String toString()
 return String.valueOf( number ) + ": " + name;
}======================================================================
CustomTransferHandler.java
* CustomTransferHandler.java
* Created on October 22, 2002, 8:36 AM
import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.*;
import java.awt.event.InputEvent;
import java.io.IOException;
import java.util.Arrays;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.TransferHandler;
* @author readb
public class CustomTransferHandler
 extends TransferHandler
 implements Transferable, ClipboardOwner, DropTargetListener
 public static final DataFlavor ROW_ARRAY_FLAVOR = new DataFlavor( DataRow[].class, "Multiple rows of data" );
 private String name;
 private ImageIcon myIcon;
 private DataRow [] data;
 private boolean clipboardOwner = false;
 private int rowIndex = -1;
 /** Creates a new instance of CustomTransferHandler */
 public CustomTransferHandler( String name )
 this.name = name;
 public boolean canImport( JComponent comp, DataFlavor [] transferFlavors )
 System.err.println( "CustomTransferHandler::canImport" );
 if ( comp instanceof JTable && ( ( JTable ) comp ).getModel() instanceof MyTableModel )
 for ( int index = 0; index < transferFlavors.length; ++index )
 if ( ! transferFlavors[ index ].equals( ROW_ARRAY_FLAVOR ) )
 return false;
 return true;
 else
 return false;
 protected Transferable createTransferable( JComponent c )
 System.err.println( "CustomTransferHandler::createTransferable" );
 if ( ! ( c instanceof JTable ) || ! ( ( ( JTable ) c ).getModel() instanceof MyTableModel ) )
 return null;
 this.data = null;
 JTable table = ( JTable ) c;
 MyTableModel model = ( MyTableModel ) table.getModel();
 Clipboard cb = table.getToolkit().getSystemClipboard();
 cb.setContents( this, this );
 clipboardOwner = true;
 int [] selectedRows = table.getSelectedRows();
 Arrays.sort( selectedRows );
 data = new DataRow[ selectedRows.length ];
 for ( int index = 0; index < data.length; ++index )
 data[ index ] = model.getRow( selectedRows[ index ] );
 return this;
 public void exportAsDrag( JComponent comp, InputEvent e, int action )
 super.exportAsDrag( comp, e, action );
 Clipboard cb = comp.getToolkit().getSystemClipboard();
 cb.setContents( this, this );
 protected void exportDone( JComponent source, Transferable data, int action )
 System.err.println( "CustomTransferHandler::exportDone" );
 if ( TransferHandler.MOVE == action && source instanceof JTable && ( ( JTable ) source ).getModel() instanceof MyTableModel )
 JTable table = ( JTable ) source;
 MyTableModel model = ( MyTableModel ) table.getModel();
 int [] selected = table.getSelectedRows();
 for ( int index = selected.length - 1; index >= 0; --index )
 model.removeRow( selected[ index ] );
 public void exportToClipboard( JComponent comp, Clipboard clip, int action )
 System.err.println( "CustomTransferHandler::exportToClipboard" );
 public int getSourceActions( JComponent c )
 System.err.println( "CustomTransferHandler::getSourceActions" );
 if ( ( c instanceof JTable ) && ( ( JTable ) c ).getModel() instanceof MyTableModel )
 return MOVE;
 else
 return NONE;
 * I've commented this out because it doesn't appear to work in any case.
 * The image isn't null but as far as I can tell this method is never
 * invoked.
// public Icon getVisualRepresentation( Transferable t )
// System.err.println( "CustomTransferHandler::getVisualRepresentation" );
// if ( t instanceof CustomTransferHandler )
// if ( null == myIcon )
// try
// myIcon = new ImageIcon( getClass().getClassLoader().getResource( "dragimage.gif" ) );
// catch ( Exception e )
// System.err.println( "CustomTransferHandler::getVisualRepresentation: exception loading image" );
// e.printStackTrace();
// if ( null == myIcon )
// System.err.println( "CustomTransferHandler::getVisualRepresentation: myIcon is still NULL" );
// return myIcon;
// else
// return null;
 public boolean importData( JComponent comp, Transferable t )
 System.err.println( "CustomTransferHandler::importData" );
 super.importData( comp, t );
 if ( ! ( comp instanceof JTable ) )
 return false;
 if ( ! ( ( ( JTable ) comp ).getModel() instanceof MyTableModel ) )
 return false;
 if ( clipboardOwner )
 return false;
 if ( !t.isDataFlavorSupported( ROW_ARRAY_FLAVOR ) )
 return false;
 try
 data = ( DataRow [] ) t.getTransferData( ROW_ARRAY_FLAVOR );
 return true;
 catch ( IOException ioe )
 data = null;
 return false;
 catch ( UnsupportedFlavorException ufe )
 data = null;
 return false;
 public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException
 System.err.println( "MyTransferable::getTransferData" );
 if ( flavor.equals( ROW_ARRAY_FLAVOR ) )
 return data;
 else
 throw new UnsupportedFlavorException( flavor );
 public DataFlavor[] getTransferDataFlavors()
 System.err.println( "MyTransferable::getTransferDataFlavors" );
 DataFlavor [] flavors = new DataFlavor[ 1 ];
 flavors[ 0 ] = ROW_ARRAY_FLAVOR;
 return flavors;
 public boolean isDataFlavorSupported( DataFlavor flavor )
 System.err.println( "MyTransferable::isDataFlavorSupported" );
 return flavor.equals( ROW_ARRAY_FLAVOR );
 public void lostOwnership( Clipboard clipboard, Transferable transferable )
 clipboardOwner = false;
 /** Called while a drag operation is ongoing, when the mouse pointer enters
 * the operable part of the drop site for the <code>DropTarget</code>
 * registered with this listener.
 * @param dtde the <code>DropTargetDragEvent</code>
 public void dragEnter(DropTargetDragEvent dtde)
 /** Called while a drag operation is ongoing, when the mouse pointer has
 * exited the operable part of the drop site for the
 * <code>DropTarget</code> registered with this listener.
 * @param dte the <code>DropTargetEvent</code>
 public void dragExit(DropTargetEvent dte)
 /** Called when a drag operation is ongoing, while the mouse pointer is still
 * over the operable part of the drop site for the <code>DropTarget</code>
 * registered with this listener.
 * @param dtde the <code>DropTargetDragEvent</code>
 public void dragOver(DropTargetDragEvent dtde)
 /** Called when the drag operation has terminated with a drop on
 * the operable part of the drop site for the <code>DropTarget</code>
 * registered with this listener.
 * 
 * This method is responsible for undertaking
 * the transfer of the data associated with the
 * gesture. The <code>DropTargetDropEvent</code>
 * provides a means to obtain a <code>Transferable</code>
 * object that represents the data object(s) to
 * be transfered.
 * From this method, the <code>DropTargetListener</code>
 * shall accept or reject the drop via the
 * acceptDrop(int dropAction) or rejectDrop() methods of the
 * <code>DropTargetDropEvent</code> parameter.
 * 
 * Subsequent to acceptDrop(), but not before,
 * <code>DropTargetDropEvent</code>'s getTransferable()
 * method may be invoked, and data transfer may be
 * performed via the returned <code>Transferable</code>'s
 * getTransferData() method.
 * 
 * At the completion of a drop, an implementation
 * of this method is required to signal the success/failure
 * of the drop by passing an appropriate
 * <code>boolean</code> to the <code>DropTargetDropEvent</code>'s
 * dropComplete(boolean success) method.
 * 
 * Note: The data transfer should be completed before the call to the
 * <code>DropTargetDropEvent</code>'s dropComplete(boolean success) method.
 * After that, a call to the getTransferData() method of the
 * <code>Transferable</code> returned by
 * <code>DropTargetDropEvent.getTransferable()</code> is guaranteed to
 * succeed only if the data transfer is local; that is, only if
 * <code>DropTargetDropEvent.isLocalTransfer()</code> returns
 * <code>true</code>. Otherwise, the behavior of the call is
 * implementation-dependent.
 * 
 * @param dtde the <code>DropTargetDropEvent</code>
 public void drop(DropTargetDropEvent dtde)
 System.err.println( "CustomTransferHandler::drop" );
 Component c = dtde.getDropTargetContext().getDropTarget().getComponent();
 if ( ! ( c instanceof JComponent ) )
 dtde.rejectDrop();
 return;
 JComponent comp = ( JComponent ) c;
 if ( ! ( c instanceof JTable ) || ! ( ( ( JTable ) c ).getModel() instanceof MyTableModel ) )
 dtde.rejectDrop();
 return;
 dtde.acceptDrop( TransferHandler.MOVE );
 // THIS is such a mess -- you can't do the following because
 // getTransferable() throws an (undocumented) exception - what's that
 // all about.
// Transferable t = dtde.getTransferable();
// if ( !t.isDataFlavourSupported( ROW_ARRAY_FLAVOR ) )
// dtde.rejectDrop();
// return false;
// TransferHandler handler = comp.getTransferHandler();
// if ( null == handler || ! handler.importData( comp, t ) )
// dtde.rejectDrop();
// return;
 Point p = dtde.getLocation();
 JTable table = ( JTable ) comp;
 rowIndex = table.rowAtPoint( p );
 // So you have to do this instead and use the data that's been
 // stored in the data member via import data. Total mess.
 if ( null == data )
 dtde.rejectDrop();
 return;
 MyTableModel model = ( MyTableModel ) table.getModel();
 if ( rowIndex == -1 )
 model.addRows( data );
 else
 model.insertRows( rowIndex, data );
 dtde.acceptDrop( TransferHandler.MOVE );
 /** Called if the user has modified
 * the current drop gesture.
 * 
 * @param dtde the <code>DropTargetDragEvent</code>
 public void dropActionChanged(DropTargetDragEvent dtde)
}

Hi again,
Well I've tried using the MouseListener / MouseMotionListener approach but it doesn't quite seem to work, although it does get the events correctly. I think the reason is that it doesn't interact correctly with the Java DnD machinery which is something that V.V hinted at. It's something that I may need to look into if / when I have more time available.
I have to say though that I haven't had any problems with scrollbars - we're making fairly heavy use of large tables and if you drag over a table with a scroll bar and move to the top or bottom then it scrolls as you would expect and allows you to drop the data where you like. For this situation I've used pretty much the same approach as for the toy example above except that I've implemented separate source and destination TransferHandlers (the source table is read-only, and it really doesn't make sense to allow people to drag from the destination table so I've essentially split the functionality of the example handler down the middle).
I'm not actually particularly in favour of messing too much with the mechanics of DnD, more because of lack of time than anything else. Guess I'll just have to put up with this for the moment. Doesn't help that DnD is so poorly documented by Sun.
Thanks for all your help.
Bart

Drag and Drop in a JTable (ContentTable)

Hello Friends,
I am designing a tool which can be used for daily task distribution, according to time (as we setup in a outlook calendar) using JTable.
Now I am planning to use a Drag and Drop option where in the task from "one date and time" can be moved to "another date and time" i.e row/column.
E.g : Suppose the new task which is scheduled at 12:30pm on 22/03/07 has to be rescheduled at 3:00pm 26/03/07. The drag and drop should automatically recognise.
It would be greate if anyone can throw in thier ideas.. 10 DUKE points..
Thanks and Rgds,
Pradeep

Here's an example of drag and drop of a cell in JTable.
You can move or copy (using Ctrl) a cell to another location:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.TransferHandler;
import javax.swing.table.DefaultTableModel;
public class DnD_Demo extends JFrame {
 public DnD_Demo() {
 setTitle("DnD Demo (Version 3)");
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 JPanel panel = new JPanel(new GridLayout(1,1));
 panel.add(createTable("Table A"));
 getContentPane().add(panel,BorderLayout.CENTER);
 pack();
 private JPanel createTable(String tableId) {
 DefaultTableModel model = new DefaultTableModel();
 model.addColumn("Column 0");
 model.addColumn("Column 1");
 model.addColumn("Column 2");
 model.addColumn("Column 3");
 model.addRow(new String[]{tableId+" 00", tableId+" 01", tableId+" 02", tableId+" 03"});
 model.addRow(new String[]{tableId+" 10", tableId+" 11", tableId+" 12", tableId+" 13"});
 model.addRow(new String[]{tableId+" 20", tableId+" 21", tableId+" 22", tableId+" 23"});
 model.addRow(new String[]{tableId+" 30", tableId+" 31", tableId+" 32", tableId+" 33"});
 JTable table = new JTable(model);
 table.getTableHeader().setReorderingAllowed(false);
 table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
 JScrollPane scrollPane = new JScrollPane(table);
 scrollPane.setPreferredSize(new Dimension(400,100));
 table.setDragEnabled(true);
 table.setTransferHandler(new TableTransferHandler());
 JPanel panel = new JPanel();
 panel.add(scrollPane);
 panel.setBorder(BorderFactory.createTitledBorder(tableId));
 return panel;
 public static void main(String[] args) {
 new DnD_Demo().setVisible(true);
 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) {
 for (int i = 0; i < flavors.length; i++) {
 if (DataFlavor.stringFlavor.equals(flavors)) {
return true;
return false;
class TableTransferHandler extends StringTransferHandler {
public JTable target;
public int row = -1;
public int col = -1;
protected String exportString(JComponent c) {
JTable table = (JTable)c;
row = table.getSelectedRow();
col = table.getSelectedColumn();
return table.getValueAt(row, col).toString();
protected void importString(JComponent c, String str) {
target = (JTable)c;
int row = target.getSelectedRow();
int col = target.getSelectedColumn();
target.getModel().setValueAt(str, row, col);
protected void cleanup(JComponent c, boolean remove) {
JTable table = (JTable)c;
if (remove)
table.getModel().setValueAt("", row, col);
Message was edited by:
Rodney_McKay

Drag and Drop between two JTables

I tried to implement drag and drop between two JTables using data transfer, but i did not get it to work, that dnd works in both directions. i have my own transferhandler, but if is use setTransferHandler(handler), i'm no longer able to start a drag from that table. i also tried to use a mouse listener to call exportAsDrag, but i only works in one direction. any ideas or examples?

That is a rather large request, and indicates that you have likely not spent much time researching the subject before posting. Read up on Swing drag & drop here (http://java.sun.com/docs/books/tutorial/dnd/), then ask specific questions about something you don't understand, problems with your implementation, etc.
Mike

Drag and drop from/to JTable

Hi,
I am trying to implement drag and drop between two JTables. I have two questions about this and I hope you can help me.
1. I would like to prevent the user from droping an Object in the same JTable as the object came from in the first place. How can I do that?
2. How can I drop an Object in a JTable if there isn�t any rows in the table?
I am using jdk 1.4.
Thanks!!!
:-)Lisa

I think you just use setDragEnabled(true) on both tables.
If not, then maybe this link will help:
http://java.sun.com/docs/books/tutorial/uiswing/misc/dnd.html

Drag and drop onto/from a JTable but not onto itself on 1.5

Hi, i can drag files from Windows Explorer onto a Jtable ,and they get opened and listed in the table, and I can drag records from the table and drop them into Windows Explorer to make a copy of a file. In order to drag files from the table I just need to drag a field in the table (fields can be selected in the table) but it is very easy to accidently start dragging when I dont want to drop and then dropping the file on to the table, I then get an error because Im trying to open a file that is already opened in the table.
How can I do the following.
1. If I have selected multiple fields (representing files) in the table I dont want the GUI to allow me to to drop those files onto itself.
2. If I have selected a single field and I drag to another field, I want to treat it as a drag and drop of a single text field rather than as a file.
of course as soon as I leave my application I want the drop to be seen as a list of files, and I want to still be able to drag files from other applications to the table. Soltion needs to be java 1.5 comptabile
thanks Paul
(So far Ive implemented a TransferHandler, Transferable and DropTarget classes)

Well Ive done it - wasn't that hard. the key thing was to put both file and field data into the transferbale when created.Then the drop target has to look for field data as a valid data flavor before it looks for a list of files data flavor.

Drag and Drop Image into JTable

I was wondering if anyone can tell me if it is possible to have an image dragged and dropped into a JTable where the single image snaps to multiple columns and rows?
Thank you.

Can anyone point me in the right direction for doing the following:
Drag and drop an image into a JTable where the single image snaps to multiple columns and rows.
Thanks.

Is it possibiel to disable drag and drop of JTable columns?

Hi,
Using JDK6 I would like to disable user to drag and drop columns and change the default layout of my JTables.
Thanks for any help,

Using JDK6 I would like to disable user to drag and drop columns Read the JTableHeader API. You can prevent reordering of the columns.
and change the default layout of my JTables.How do you expect us to answser this??? What do you mean by changing the layout? Whats wrong with row and column and what do you want to change it to?

How to Drag and Drop mutliple rows in the jtable

hai
i am having a jtree ,in which i added many nodes,each nodes hav
corresponding jtable with values. now i need to drag a group of rows from a jtable of particular node in jtree to another node.
at the same time i am possible to drag and drop the single row in the same sceanrio which i mentioned above.
how to do this,can anyone pls help me regarding this
goutham

The Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/misc/dnd.html]How to Use Drag and Drop has an example with JTable support.

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 AM

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 AM

Drag and drop not working. When trying to move a cell or icon the shadow of the cell or icon being moved appears under the cursor but can't be released causing a freeze of function within the program. Happens in finder numbers and firefox

Drag and drop not working. When trying to move a cell or icon the shadow of the cell or icon being moved appears under the cursor but can't be released causing a freeze of function within the program. Happens in finder numbers, firefox, and when trying to move any file from the downloads folder.
This is a serious pain.
Please help.
WB

Yes, all I can tell you is that Finder does not have that function in ML. Your system is "working as expected".
You can file feedback here.

Drag and Drop inside a component

I am using the Project Gantt component and want to drag and drop inside the component. I want to drag a timeline from one row and drop it to another row. And also drag a timeline from a row and drop it another place in the same row. Can I make the component a dragsource and droptarget?

Hi,
should be posted at JDeveloper and OC4J 11g Technology Preview
Frank

JTable inside JTable cell: drag and drop

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