JTable copy and paste using Clipboard and AbstractAction
When I try to paste into a JTable cell using table.setValueAt(), the cell I am pasting in remains blank, but setValueAt() seems to be working. Also, when I try to cut or copy from one cell, the Paste option on my JPopupMenu remains disabled when I want to paste into another cell. I'm not sure why. My code is below.
class CopyAction extends AbstractAction {
private JTable table;
public CopyAction(JTable table)
{
this.table = table;
}
@Override
public void actionPerformed(ActionEvent e)
{
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
cb.setContents(new CellTransferable(table.getValueAt(row, col)), null);
}
}
class CutAction extends AbstractAction {
private JTable table;
public CutAction(JTable table)
{
this.table = table;
}
@Override
public void actionPerformed(ActionEvent e)
{
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
cb.setContents(new CellTransferable(table.getValueAt(row, col)), null);
}
}
class PasteAction extends AbstractAction {
private JTable table;
private GridModel gridModel;
public PasteAction(JTable tbl, GridModel gm)
{
gridModel = gm;
table = tbl;
final Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
cb.addFlavorListener(new FlavorListener() {
@Override
public void flavorsChanged(FlavorEvent e)
{
setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
}
});
setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
}
@Override
public void actionPerformed(ActionEvent e)
{
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
if (cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR))
{
try
{
Object value = cb.getData(CellTransferable.CELL_DATA_FLAVOR);
System.out.println(value);
table.setValueAt(value, row, col);
}
catch (UnsupportedFlavorException | IOException ex)
{
ex.printStackTrace();
}
}
}
}
class CellTransferable implements Transferable {
public static final DataFlavor CELL_DATA_FLAVOR = new DataFlavor(Object.class, "application/x-cell-value");
private Object cellValue;
public CellTransferable(Object cellValue) {
this.cellValue = cellValue;
}
@Override
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[]{CELL_DATA_FLAVOR};
}
@Override
public boolean isDataFlavorSupported(DataFlavor flavor) {
return CELL_DATA_FLAVOR.equals(flavor);
}
@Override
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if (!isDataFlavorSupported(flavor)) {
throw new UnsupportedFlavorException(flavor);
}
return cellValue;
}
}
Here's my code for setValueAt()
class MyModel extends AbstractTableModel
{
private String[] names = {"1", "2", "3", "4", "5" };
private String[][] values = new String[5][5];
//...other methods
public void setValueAt(Object value, int row, int col)
{
if (value instanceof Double || value instanceof Integer)
values[row][col] = value.toString();
else
{
values[row][col] = (String) value;
}
fireTableCellUpdated(row, col);
}
}
Answer
Based on your example code and having to fill in the blanks, it works for me...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.FlavorEvent;
import java.awt.datatransfer.FlavorListener;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JPopupMenu;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class TableExample {
public static void main(String[] args) {
new TableExample();
}
public TableExample() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JTable table = new JTable(new MyModel());
final JPopupMenu pm = new JPopupMenu();
pm.add(new CopyAction(table));
pm.add(new PasteAction(table));
table.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.isPopupTrigger()) {
highlightRow(e);
doPopup(e);
}
}
@Override
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) {
highlightRow(e);
doPopup(e);
}
}
protected void doPopup(MouseEvent e) {
pm.show(e.getComponent(), e.getX(), e.getY());
}
protected void highlightRow(MouseEvent e) {
JTable table = (JTable) e.getSource();
Point point = e.getPoint();
int row = table.rowAtPoint(point);
int col = table.columnAtPoint(point);
table.setRowSelectionInterval(row, row);
table.setColumnSelectionInterval(col, col);
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(table);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MyModel extends AbstractTableModel {
private String[] names = {"1", "2", "3", "4", "5"};
private String[][] values = new String[5][5];
public MyModel() {
values = new String[10][names.length];
for (int row = 0; row < 10; row++) {
for (int col = 0; col < names.length; col++) {
values[row][col] = String.valueOf((char) ((row * names.length) + col + 65));
}
}
}
@Override
public void setValueAt(Object value, int row, int col) {
if (value instanceof Double || value instanceof Integer) {
values[row][col] = value.toString();
} else {
values[row][col] = (String) value;
}
fireTableCellUpdated(row, col);
}
@Override
public int getRowCount() {
return values.length;
}
@Override
public int getColumnCount() {
return names.length;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return values[rowIndex][columnIndex];
}
}
class CopyAction extends AbstractAction {
private JTable table;
public CopyAction(JTable table) {
this.table = table;
putValue(NAME, "Copy");
}
@Override
public void actionPerformed(ActionEvent e) {
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
cb.setContents(new CellTransferable(table.getValueAt(row, col)), null);
}
}
class CutAction extends AbstractAction {
private JTable table;
public CutAction(JTable table) {
this.table = table;
}
@Override
public void actionPerformed(ActionEvent e) {
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
cb.setContents(new CellTransferable(table.getValueAt(row, col)), null);
}
}
class PasteAction extends AbstractAction {
private JTable table;
public PasteAction(JTable tbl) {
putValue(NAME, "Paste");
table = tbl;
final Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
cb.addFlavorListener(new FlavorListener() {
@Override
public void flavorsChanged(FlavorEvent e) {
setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
}
});
setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
}
@Override
public void actionPerformed(ActionEvent e) {
int row = table.getSelectedRow();
int col = table.getSelectedColumn();
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
if (cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)) {
try {
Object value = cb.getData(CellTransferable.CELL_DATA_FLAVOR);
System.out.println(value);
table.setValueAt(value, row, col);
} catch (UnsupportedFlavorException | IOException ex) {
ex.printStackTrace();
}
}
}
}
public static class CellTransferable implements Transferable {
public static final DataFlavor CELL_DATA_FLAVOR = new DataFlavor(Object.class, "application/x-cell-value");
private Object cellValue;
public CellTransferable(Object cellValue) {
this.cellValue = cellValue;
}
@Override
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[]{CELL_DATA_FLAVOR};
}
@Override
public boolean isDataFlavorSupported(DataFlavor flavor) {
return CELL_DATA_FLAVOR.equals(flavor);
}
@Override
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if (!isDataFlavorSupported(flavor)) {
throw new UnsupportedFlavorException(flavor);
}
return cellValue;
}
}
}
Now, maybe you'd like to provide a runnable example that demonstrates it not working...