Drag-and-Drop customization: drag the foreground color from the first label and drop it as the background color into the second one : Drag Drop « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. Drag Drop

/*
 * Copyright (c) 2004 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 3nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose,
 * including teaching and use in open-source projects.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book, 
 * please visit http://www.davidflanagan.com/javaexamples3.
 */

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.TransferHandler;

/**
 * Simple Drag-and-Drop customization: drag the foreground color from the first
 * label and drop it as the background color into the second one. Try it also
 * using the ShowBean program to display a JColorChooser component with
 * dragEnabled=true.
 */
public class ColorDrag {
  public static void main(String args[]) {
    // Create two JLabel objects
    final JLabel label1 = new JLabel("Drag here");
    JLabel label2 = new JLabel("Drop here");

    // Register TransferHandler objects on them: label1 transfers its
    // foreground color and label2 transfers its background color.
    label1.setTransferHandler(new TransferHandler("foreground"));
    label2.setTransferHandler(new TransferHandler("background"));

    // Give label1 a foreground color other than the default
    // Make label2 opaque so it displays its background color
    label1.setForeground(new Color(100, 100, 200));
    label2.setOpaque(true);

    // Now look for drag gestures over label1. When one occurs,
    // tell the TransferHandler to begin a drag.
    // Exercise: modify this gesture recognition so that the drag doesn't
    // begin until the mouse has moved 4 pixels. This helps to keep
    // drags distinct from sloppy clicks. To do this, you'll need both
    // a MouseListener and a MouseMotionListener.
    label1.addMouseMotionListener(new MouseMotionAdapter() {
      public void mouseDragged(MouseEvent e) {
        TransferHandler handler = label1.getTransferHandler();
        handler.exportAsDrag(label1, e, TransferHandler.COPY);
      }
    });

    // Create a window, add the labels, and make it all visible.
    JFrame f = new JFrame("ColorDrag");
    f.getContentPane().setLayout(new FlowLayout());
    f.getContentPane().add(label1);
    f.getContentPane().add(label2);
    f.pack();
    f.setVisible(true);
  }
}

14.112.Drag Drop
	14.112.1.	Basic drag and drop
	14.112.2.	Dragging Text from a JLabel
	14.112.3.	Drag-and-Drop Support for Images
	14.112.4.	Drag and drop icons: use an icon property.
	14.112.5.	implements DragGestureListener, Transferable
	14.112.6.	Dragging and dropping text between a text area, a list, and a table
	14.112.7.	Drag and drop between JTextArea and JTextField
	14.112.8.	Transfer both Text and Color between JTextField and JTextArea
	14.112.9.	Drag and drop between JList and JTextField
	14.112.10.	DropMode.ON
	14.112.11.	DropMode.INSERT
	14.112.12.	DropMode.ON_OR_INSERT
	14.112.13.	Set tree DropMode to DropMode.USE_SELECTION
	14.112.14.	Set tree drag mode to DropMode.ON
	14.112.15.	Set tree drag mode to DropMode.INSERT
	14.112.16.	Set tree drag mode to DropMode.ON_OR_INSERT
	14.112.17.	Choose Drop Action
	14.112.18.	Various drop actions
	14.112.19.	JTable drag and drop
	14.112.20.	Create a drag source a drop target and a transferable object.
	14.112.21.	Making a Component Draggable
	14.112.22.	Detect a drag initiating gesture in your application
	14.112.23.	Illustrates cut, copy, paste and drag and drop using three instances of JList
	14.112.24.	Location sensitive drag and drop
	14.112.25.	Demonstration of the top-level TransferHandler support on JFrame
	14.112.26.	Drag-and-Drop customization: drag the foreground color from the first label and drop it as the background color into the second one
	14.112.27.	Demonstrates how to add copy and drag support to a Swing component with TransferHandler
	14.112.28.	ScribblePane allows individual PolyLine lines to be selected, cut, copied, pasted, dragged, and dropped
	14.112.29.	Built-in drag and drop support: utilize a TransferHandler class
	14.112.30.	DND Drag and drop List