Drag and drop: TextArea 2 : TextArea « Swing JFC « Java

Drag and drop: TextArea 2

Drag and drop: TextArea 2
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
// DropTest.java
//A simple drag & drop tester application.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;

public class DropTest extends JFrame implements DropTargetListener {

  DropTarget dt;

  JTextArea ta;

  public DropTest() {
    super("Drop Test");
    setSize(300, 300);

        new JLabel("Drop a list from your file chooser here:"),
    ta = new JTextArea();
    getContentPane().add(ta, BorderLayout.CENTER);

    // Set up our text area to recieve drops...
    // This class will handle drop events
    dt = new DropTarget(ta, this);

  public void dragEnter(DropTargetDragEvent dtde) {
    System.out.println("Drag Enter");

  public void dragExit(DropTargetEvent dte) {
    System.out.println("Source: " + dte.getSource());
    System.out.println("Drag Exit");

  public void dragOver(DropTargetDragEvent dtde) {
    System.out.println("Drag Over");

  public void dropActionChanged(DropTargetDragEvent dtde) {
    System.out.println("Drop Action Changed");

  public void drop(DropTargetDropEvent dtde) {
    try {
      // Ok, get the dropped object and try to figure out what it is
      Transferable tr = dtde.getTransferable();
      DataFlavor[] flavors = tr.getTransferDataFlavors();
      for (int i = 0; i < flavors.length; i++) {
        System.out.println("Possible flavor: "
            + flavors[i].getMimeType());
        // Check for file lists specifically
        if (flavors[i].isFlavorJavaFileListType()) {
          // Great! Accept copy drops...
          ta.setText("Successful file list drop.\n\n");

          // And add the list of file names to our text area
          java.util.List list = (java.util.List) tr
          for (int j = 0; j < list.size(); j++) {
            ta.append(list.get(j) + "\n");

          // If we made it this far, everything worked.
      // Hmm, the user must not have dropped a file list
      System.out.println("Drop failed: " + dtde);
    } catch (Exception e) {

  public static void main(String args[]) {
    new DropTest();


Related examples in the same category

1.Creating a JTextArea Component
2.Insert some text after the 5th character
3.Delete the first 5 characters
4.Enumerating the Lines in a JTextArea Component
5.Modifying Text in a JTextArea Component
6.Fancier custom caret classFancier custom caret class
7.Show line start end offsets in a JTextAreaShow line start end offsets in a JTextArea
8.A TransferHandler and JTextArea that will accept any drop at allA TransferHandler and JTextArea that will accept any drop at all
9.Drop: TextAreaDrop: TextArea
10.Caret SampleCaret Sample
11.TextArea Background ImageTextArea Background Image
12.Cut Paste SampleCut Paste Sample
13.TextArea SampleTextArea Sample
14.TextArea ExampleTextArea Example
15.Wrap textareaWrap textarea
16.Replace text in text areaReplace text in text area
17.TextField ExampleTextField Example
18.TextArea Elements 2TextArea Elements 2
19.TextArea ElementsTextArea Elements
20.TextArea Views 2TextArea Views 2
21.TextArea Views 3TextArea Views 3
22.TextArea with UnicodeTextArea with Unicode
23.Internationalized Graphical User Interfaces: unicode cut and pasteInternationalized Graphical User Interfaces: unicode cut and paste
24.Text Component Demo 2Text Component Demo 2
25.Text Component DemoText Component Demo
26.Text Input DemoText Input Demo
27.Text Components Sampler DemoText Components Sampler Demo
28.TextArea Share ModelTextArea Share Model
29.Set the start of the selection; ignored if new start is < end
30.Set the end of the selection; ignored if new end is > start
31.Set the caret color
32.Simple Editor DemoSimple Editor Demo
33.Setting the Tab Size of a JTextArea Component
34.Moving the Focus with the TAB Key in a JTextArea Component
35.Enabling Word-Wrapping and Line-Wrapping in a JTextArea Component
36.Append some text to JTextArea
37.Replace the first 3 characters with some text
38.Enable word-wrapping
39.Enumerate the content elements with a ElementIterator
40.Highlight of discontinous string
41.Copy selected text from one text area to another