Drag the component from one cell to another cell within JTable

Question

Hi All,
I have one requirement to drag the component from JList to JTable cell. I am able to do it but once if i drag the component from list to table cell, table accepting the drop after this i am unable to move the same component from one cell to another cell within the table.
Any advice.
I have used the following logic for JTable and JList is drag enabled.
DefaultTableModel tableModel=new DefaultTableModel(
            new Object [][] {
                {null, null, null, null,null,null,null},
                {null, null, null, null,null,null,null},
                {null, null, null, null,null,null,null},
                {null, null, null, null,null,null,null}
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4","Title 5","Title 6","Title 7"
        JTable table = new javax.swing.JTable(){
            public boolean isCellEditable(int row, int column)
                return false;
        table.setModel(tableModel);
        table.setDragEnabled(true);
        table.setDropMode(DropMode.INSERT);
        table.setTransferHandler(new TransferHandler(){
            public boolean canImport(TransferHandler.TransferSupport info){
                if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)){
                    return false;
                return true;
            public boolean importData(TransferSupport support) {
                if (!support.isDrop()) {
                    return false;
                if (!canImport(support)) {
                    return false;
                JTable table=(JTable)support.getComponent();
                DefaultTableModel tableModel=(DefaultTableModel)table.getModel();
                // fetch the drop location
                JTable.DropLocation dl = (JTable.DropLocation)support.getDropLocation();
                int row = dl.getRow();
                int col=dl.getColumn();
                // fetch the data and bail if this fails
                String data;
                try {
                    data = (String)support.getTransferable().getTransferData(DataFlavor.stringFlavor);
                } catch (UnsupportedFlavorException e) {
                    return false;
                } catch (IOException e) {
                    return false;
                calendarTableModel.setValueAt(data, row, col);
                return true;
        });Thanks & Regards,
Maadhav.
Edited by: maadhav on Jun 23, 2009 12:29 AM

Answer 1

Hi All,
I fixed this issue with some additional logic which allow me to drag and drop the string component from one cell to another cell within in the JTable.
I am attaching the new logic here, if any one needs use it.
DefaultTableModel tableModel=new DefaultTableModel(
            new Object [][] {
                {null, null, null, null,null,null,null},
                {null, null, null, null,null,null,null},
                {null, null, null, null,null,null,null},
                {null, null, null, null,null,null,null}
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4","Title 5","Title 6","Title 7"
        JTable table = new javax.swing.JTable(){
            public boolean isCellEditable(int row, int column)
                return false;
        table.setModel(tableModel);
        table.setDragEnabled(true);
        table.setDropMode(DropMode.USE_SELECTION);
        table.setTransferHandler(new TransferHandler(){
          public int getSourceActions(JComponent c) {
                return DnDConstants.ACTION_COPY_OR_MOVE;
            public Transferable createTransferable(JComponent comp)
                JTable table=(JTable)comp;
                int row=table.getSelectedRow();
                int col=table.getSelectedColumn();
                String value = (String)table.getModel().getValueAt(row,col);
                StringSelection transferable = new StringSelection(value);
                table.getModel().setValueAt(null,row,col);
                return transferable;
            public boolean canImport(TransferHandler.TransferSupport info){
                if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)){
                    return false;
                return true;
            public boolean importData(TransferSupport support) {
                if (!support.isDrop()) {
                    return false;
                if (!canImport(support)) {
                    return false;
                JTable table=(JTable)support.getComponent();
                DefaultTableModel tableModel=(DefaultTableModel)table.getModel();
               JTable.DropLocation dl = (JTable.DropLocation)support.getDropLocation();
                int row = dl.getRow();
                int col=dl.getColumn();
                String data;
                try {
                    data = (String)support.getTransferable().getTransferData(DataFlavor.stringFlavor);
                } catch (UnsupportedFlavorException e) {
                    return false;
                } catch (IOException e) {
                    return false;
                tableModel.setValueAt(data, row, col);
                return true;
        });Thanks & Regards,
Maadhav..
Edited by: maadhav on Jun 23, 2009 5:26 AM
Edited by: maadhav on Jun 23, 2009 5:28 AM