/* * Copyright (c) 1995 - 2008 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: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions 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 nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package events;/* * DocumentEventDemo.java requires no other files. */import javax.swing.*;import javax.swing.text.*;import javax.swing.event.*;import java.awt.Dimension;import java.awt.BorderLayout;import java.awt.GridBagLayout;import java.awt.GridBagConstraints;import java.awt.event.*;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() {        //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();            }        });    }}