Mega Code Archive
Document Event Demo
<![CDATA[
/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
/*
* DocumentEventDemo.java is a 1.4 example that
* requires no other files.
*/
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Document;
public class DocumentEventDemo extends JPanel
implements ActionListener {
JTextField textField;
JTextArea textArea;
JTextArea displayArea;
public DocumentEventDemo() {
super(new GridBagLayout());
GridBagLayout gridbag = (GridBagLayout)getLayout();
GridBagConstraints c = new GridBagConstraints();
JButton button = new JButton("Clear");
button.addActionListener(this);
textField = new JTextField(20);
textField.addActionListener(new MyTextActionListener());
textField.getDocument().addDocumentListener(new MyDocumentListener());
textField.getDocument().putProperty("name", "Text Field");
textArea = new JTextArea();
textArea.getDocument().addDocumentListener(new MyDocumentListener());
textArea.getDocument().putProperty("name", "Text Area");
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setPreferredSize(new Dimension(200, 75));
displayArea = new JTextArea();
displayArea.setEditable(false);
JScrollPane displayScrollPane = new JScrollPane(displayArea);
displayScrollPane.setPreferredSize(new Dimension(200, 75));
c.gridx = 0;
c.gridy = 0;
c.weightx = 1.0;
c.fill = GridBagConstraints.HORIZONTAL;
gridbag.setConstraints(textField, c);
add(textField);
c.gridx = 0;
c.gridy = 1;
c.weightx = 0.0;
c.gridheight = 2;
c.fill = GridBagConstraints.BOTH;
gridbag.setConstraints(scrollPane, c);
add(scrollPane);
c.gridx = 1;
c.gridy = 0;
c.weightx = 1.0;
c.weighty = 1.0;
gridbag.setConstraints(displayScrollPane, c);
add(displayScrollPane);
c.gridx = 1;
c.gridy = 2;
c.weightx = 0.0;
c.gridheight = 1;
c.weighty = 0.0;
c.fill = GridBagConstraints.HORIZONTAL;
gridbag.setConstraints(button, c);
add(button);
setPreferredSize(new Dimension(450, 250));
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
}
class MyDocumentListener implements DocumentListener {
final String newline = "\n";
public void insertUpdate(DocumentEvent e) {
updateLog(e, "inserted into");
}
public void removeUpdate(DocumentEvent e) {
updateLog(e, "removed from");
}
public void changedUpdate(DocumentEvent e) {
//Plain text components don't fire these events.
}
public void updateLog(DocumentEvent e, String action) {
Document doc = (Document)e.getDocument();
int changeLength = e.getLength();
displayArea.append(
changeLength + " character"
+ ((changeLength == 1) ? " " : "s ")
+ action + " " + doc.getProperty("name") + "."
+ newline
+ " Text length = " + doc.getLength() + newline);
displayArea.setCaretPosition(displayArea.getDocument().getLength());
}
}
class MyTextActionListener implements ActionListener {
/** Handle the text field Return. */
public void actionPerformed(ActionEvent e) {
int selStart = textArea.getSelectionStart();
int selEnd = textArea.getSelectionEnd();
textArea.replaceRange(textField.getText(),
selStart, selEnd);
textField.selectAll();
}
}
/** Handle button click. */
public void actionPerformed(ActionEvent e) {
displayArea.setText("");
textField.requestFocus();
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("DocumentEventDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new DocumentEventDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
]]>