Code
class TableRowTransferHandler extends TransferHandler {
private final DataFlavor localObjectFlavor;
private int[] indices;
private int addIndex = -1; //Location where items were added
private int addCount; //Number of items added.
private JComponent source;
public TableRowTransferHandler() {
super();
localObjectFlavor = new DataFlavor(Object[].class, "Array of items");
}
@Override protected Transferable createTransferable(JComponent c) {
source = c;
JTable table = (JTable) c;
DefaultTableModel model = (DefaultTableModel) table.getModel();
List<Object> list = new ArrayList<>();
indices = table.getSelectedRows();
for (int i : indices) {
list.add(model.getDataVector().elementAt(i));
}
Object[] transferedObjects = list.toArray();
return new Transferable() {
@Override public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[] {FLAVOR};
}
@Override public boolean isDataFlavorSupported(DataFlavor flavor) {
return Objects.equals(FLAVOR, flavor);
}
@Override public Object getTransferData(DataFlavor flavor)
throws UnsupportedFlavorException, IOException {
if (isDataFlavorSupported(flavor)) {
return nodes;
} else {
throw new UnsupportedFlavorException(flavor);
}
}
};
}
@Override public boolean canImport(TransferSupport info) {
JTable table = (JTable) info.getComponent();
boolean isDroppable = info.isDrop()
&& info.isDataFlavorSupported(localObjectFlavor);
//XXX bug?
table.setCursor(isDroppable ? DragSource.DefaultMoveDrop
: DragSource.DefaultMoveNoDrop);
return isDroppable;
}
@Override public int getSourceActions(JComponent c) {
return TransferHandler.MOVE; //TransferHandler.COPY_OR_MOVE;
}
@Override public boolean importData(TransferSupport info) {
if (!canImport(info)) {
return false;
}
TransferHandler.DropLocation tdl = info.getDropLocation();
if (!(tdl instanceof JTable.DropLocation)) {
return false;
}
JTable.DropLocation dl = (JTable.DropLocation) tdl;
JTable target = (JTable) info.getComponent();
DefaultTableModel model = (DefaultTableModel) target.getModel();
int index = dl.getRow();
//boolean insert = dl.isInsert();
int max = model.getRowCount();
if (index < 0 || index > max) {
index = max;
}
addIndex = index;
target.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
try {
Object[] values =
(Object[]) info.getTransferable().getTransferData(localObjectFlavor);
if (Objects.equals(source, target)) {
addCount = values.length;
}
for (int i = 0; i < values.length; i++) {
int idx = index++;
model.insertRow(idx, (Vector) values[i]);
target.getSelectionModel().addSelectionInterval(idx, idx);
}
return true;
} catch (UnsupportedFlavorException | IOException ex) {
ex.printStackTrace();
}
return false;
}
@Override protected void exportDone(
JComponent c, Transferable data, int action) {
cleanup(c, action == MOVE);
}
private void cleanup(JComponent c, boolean remove) {
if (remove && indices != null) {
c.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
DefaultTableModel model = (DefaultTableModel) ((JTable) c).getModel();
if (addCount > 0) {
for (int i = 0; i < indices.length; i++) {
if (indices[i] >= addIndex) {
indices[i] += addCount;
}
}
}
for (int i = indices.length - 1; i >= 0; i--) {
model.removeRow(indices[i]);
}
}
indices = null;
addCount = 0;
addIndex = -1;
}
}
References
