TableTransferHandler.java

/*
 *  Jajuk
 *  Copyright (C) The Jajuk Team
 *  http://jajuk.info
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *  
 */
package org.jajuk.ui.helpers;

import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragSource;

import javax.swing.JComponent;
import javax.swing.TransferHandler;

import org.jajuk.ui.widgets.JajukTable;

/**
 * DND handler for table.
 */
public class TableTransferHandler extends TransferHandler {
  /** Generated serialVersionUID. */
  private static final long serialVersionUID = 1L;
  final JajukTable jtable;

  /**
   * Constructor.
   * 
   * @param jtable 
   */
  public TableTransferHandler(final JajukTable jtable) {
    this.jtable = jtable;
    DragSource source = DragSource.getDefaultDragSource();
    // Override the drag gesture recognizer as it doesn't work well when dragging from a jtable :
    // 1 select row 1
    // 2 start dragging row 2 : the drag gesture is not recognized because the row 2 is not yet selected
    source.createDefaultDragGestureRecognizer(jtable, DnDConstants.ACTION_COPY,
        new DragGestureListener() {
          @Override
          public void dragGestureRecognized(DragGestureEvent dge) {
            Transferable transferable = createTransferable(jtable);
            //and this is the magic right here
            dge.startDrag(null, transferable);
          }
        });
  }

  /**
   * Called when dragging.
   * 
   * @param c 
   * 
   * @return the transferable
   */
  @Override
  protected Transferable createTransferable(JComponent c) {
    return new TransferableTableRows(jtable.getSelection());
  }

  /**
   * return action type.
   * 
   * @param c 
   * 
   * @return the source actions
   */
  @Override
  public int getSourceActions(JComponent c) {
    return COPY_OR_MOVE;
  }
}