Transferable Color : Drag Drop « Swing JFC « Java

Transferable Color

 * This example is from the book "Java Foundation Classes in a Nutshell".
 * Written by David Flanagan. Copyright (c) 1999 by O'Reilly & Associates.  
 * You may distribute this source code for non-commercial purposes only.
 * You may study, modify, and use this example for any purpose, as long as
 * this notice is retained.  Note that this example is provided "as is",
 * WITHOUT WARRANTY of any kind either expressed or implied.

import java.awt.Color;
import java.awt.datatransfer.*;

 * This class is used to transfer a Color object via cut-and-paste or
 * drag-and-drop.  It allows a color to be transfered as a Color object,
 * or as a string. Due to a long-standing bug in Java 1.1 and Java 2, 
 * transferring a color as a string to native Windows applications will
 * not work.
public class TransferableColor implements Transferable {
  // This DataFlavor object is used when we transfer Color objects directly
  protected static DataFlavor colorFlavor =
    new DataFlavor(Color.class, "Java Color Object");

  // These are the data flavors we support.
  protected static DataFlavor[] supportedFlavors = {
    colorFlavor,                  // Transfer as a Color object
    DataFlavor.stringFlavor,      // Transfer as a String object
    DataFlavor.plainTextFlavor,   // Transfer as a stream of unicode text

  Color color;                    // The color we encapsulate and transfer

  /** Create a new TransferableColor that encapsulates the specified color */
  public TransferableColor(Color color) { this.color = color; }

  /** Return a list of DataFlavors we can support */
  public DataFlavor[] getTransferDataFlavors() { return supportedFlavors; }

  /** Check whether a specified DataFlavor is available */
  public boolean isDataFlavorSupported(DataFlavor flavor) {
    if (flavor.equals(colorFlavor) || 
        flavor.equals(DataFlavor.stringFlavor) ||
        flavor.equals(DataFlavor.plainTextFlavor)) return true;
    return false;

   * Transfer the data.  Given a specified DataFlavor, return an Object
   * appropriate for that flavor.  Throw UnsupportedFlavorException if we
   * don't support the requested flavor.
  public Object getTransferData(DataFlavor flavor) 
       throws UnsupportedFlavorException, IOException
    if (flavor.equals(colorFlavor)) return color;
    else if (flavor.equals(DataFlavor.stringFlavor)) return color.toString();
    else if (flavor.equals(DataFlavor.plainTextFlavor))
      return new ByteArrayInputStream(color.toString().getBytes("Unicode"));
    else throw new UnsupportedFlavorException(flavor);


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