JTableDragHandler.java

package org.pegadi.disposal;

import javax.swing.*;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;

public class JTableDragHandler extends TransferHandler {
    
    private JTable table;
    private PageTableModel tableModel;
    private int fromRow = -1;

    public JTableDragHandler(JTable table) {
        this.table = table;
        tableModel = (PageTableModel)table.getModel();
    }
    
    /* This handler can only be dropped on from itself. Achieves this by checking
    if this handler itself is currently moving something
     */
    public boolean canImport(TransferSupport info) {
        return fromRow >= 0;
    }
    
    public int getSourceActions(JComponent c) {
        return TransferHandler.MOVE;
    }
    
    public boolean importData(TransferSupport info) {
        JTable.DropLocation dl = (JTable.DropLocation)info.getDropLocation();
        int droppedRowIndex = dl.getRow();

        return tableModel.movePage(fromRow, droppedRowIndex);
    }
    
    protected void exportDone(JComponent c, Transferable t, int act) {
        fromRow = -1;
    }
    protected Transferable createTransferable(JComponent c) {
        fromRow = table.getSelectedRow();
        return new StringSelection(tableModel.getPage(fromRow).toString());
    }
}