dndlistener.java

groupoffice

package jupload;

import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.io.File;
import java.util.List;


public class DnDListener implements DropTargetListener
{
    
    //------------- INFORMATION --------------------------------------------
    public static final String TITLE = "JUpload DnDListener";
    public static final String DESCRIPTION =
            "Drap and Drop Listener.";
    public static final String AUTHOR = "William JinHua Kwong";
    
    public static final double VERSION = 0.1;
    public static final String LAST_MODIFIED = "22 January 2004";
    
    //------------- VARIABLES ----------------------------------------------
    private JUploadPanel jup;
    
    //------------- CONSTRUCTOR --------------------------------------------
    public DnDListener(JUploadPanel jup)
    {
        this.jup = jup;
    }
    
    //------------- Public Functions ---------------------------------------
    public void dragEnter(DropTargetDragEvent e)
    {
        if(!e.isDataFlavorSupported(DataFlavor.javaFileListFlavor))
        {
            e.rejectDrag();
        }
        else
        {
            //e.acceptDrag(e.getDropAction());
        }
    }
    
    public void dragOver(DropTargetDragEvent e)
    {
    }
    
    public void dropActionChanged(DropTargetDragEvent e)
    {
    }
    
    public void drop(DropTargetDropEvent e)
    {
        if(!e.isDataFlavorSupported(DataFlavor.javaFileListFlavor))
        {
            e.rejectDrop();
        }
        else
        {
            e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
            try
            {
                List fileList = (List) e.getTransferable().getTransferData(
                        DataFlavor.javaFileListFlavor);
                jup.addFiles((File[])fileList.toArray());
                e.getDropTargetContext().dropComplete(true);
            }
            catch (IOException ioe)
            {
                ioe.printStackTrace();
                e.rejectDrop();
            }
            catch (UnsupportedFlavorException ufe)
            {
                ufe.printStackTrace();
                e.rejectDrop();
            }
            
        }
    }
    
    public void dragExit(DropTargetEvent e)
    {
    }
}