Name: rlT66838 Date: 05/19/2000


java version "1.3.0rc2
Java<TM> 2 Runtime Environment, Standard Edition <build 1.3.0rc2-Y>
Classic VM <build 1.3.0rc2-Y, native threads, nojit>

When we drag a Japanese filenamed file from Windows Explorer onto our app, the
characters in the filename are corrupted so that the app cannot open/access the
file. (The problem appears to happen with any non-ascii character, i.e. < 127.)

The following code demonstrates the problem. Try to drag a file whose name
contains multi-byte or non-ascii characters onto the JFrame window that the app
opens. The window will display an error message and the garbage characters
that were received in the drop.

Thank you in advance for your help. We are planning on shipping our desktop
Java app to customers in Japan and Europe this summer, and to not have drag and
drop work is a very serious problem. I hope that the problem is on my end with
something that I am doing incorrectly, and if it is, I apologize for troubling
you.

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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import javax.swing.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;

public class DropLabel extends JLabel
{
    public DropLabel(String s)
    {
        setText(s);
        new DropHandler(this);
        showDrop(false);
    }

    private void showDrop(boolean b)
    {
        setForeground (b?Color.white: Color.black);
    }

    public static void main(String[] args)
    {
        JFrame frame = new JFrame();
        frame.setTitle("DropLabel test");
        frame.getContentPane().add(new DropLabel("Drop here"));

        frame.addWindowListener( new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        frame.setSize(300,100);
        frame.setVisible(true);
    }


    /**
     * Configure to desired flavor of dropped data.
     */
    private DataFlavor getDesiredFlavor ()
    {
        return DataFlavor.javaFileListFlavor;
    }

    /**
     * Check to make sure that the contains the expected object types.
     */
    private void checkDroppedData(Object data)
    {
        System.out.println( "Got data: "+data.getClass().getName());
        if (data instanceof AbstractList)
        {
            AbstractList files = (AbstractList)data;
            setText (((File)files.get(0)).toString());
            if (((File)files.get(0)).isFile())
              setText (((File)files.get(0)).toString());
            else
              setText("Error: not valid file: " +
                                            ((File)files.get(0)).toString());
        }
        else
        {
            System.out.println( "Error: wrong type of data dropped");
        }
    }

    /**********************************************************************
    * This class defines a listener that tracks the state of the
    * drag-and-drop operation.
    */
    public class DropHandler implements DropTargetListener
    {
        private final int action = DnDConstants.ACTION_COPY;

        public DropHandler (Component component)
        {
            new DropTarget (component, action, this, true);

        }
        
        private boolean isDragOk(DropTargetDragEvent e)
        {
            boolean canDrop = false;
            try
            {
                canDrop = e.isDataFlavorSupported(getDesiredFlavor());
            }
            catch(Exception ex) {}

            if (canDrop)
                e.acceptDrag(action);
            else
                e.rejectDrag();
            showDrop (canDrop);
            return canDrop;
        }

        public void dragEnter(DropTargetDragEvent e)
        {
            isDragOk(e);
        }

        public void dragOver(DropTargetDragEvent e)
        {
            isDragOk(e);
        }

        public void dropActionChanged(DropTargetDragEvent e)
        {
            isDragOk(e);
        }

        public void dragExit(DropTargetEvent e)
        {
            showDrop (false);
        }

        public void drop(DropTargetDropEvent e)
        {
            try
            {
                e.acceptDrop(action);
                checkDroppedData(e.getTransferable().getTransferData
(getDesiredFlavor()));
            }
            catch (Exception err) {}
            e.dropComplete(true);
            showDrop (false);
        }
    }
}
(Review ID: 105133)
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