/* * 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 components;/* * TextAreaDemo.java requires no other files. */import javax.swing.*;import java.util.*;import javax.swing.event.DocumentEvent;import javax.swing.event.DocumentListener;import java.awt.event.ActionEvent;import javax.swing.text.BadLocationException;import javax.swing.GroupLayout.*;public class TextAreaDemo extends JFrame        implements DocumentListener {        private JLabel jLabel1;    private JScrollPane jScrollPane1;    private JTextArea textArea;        private static final String COMMIT_ACTION = "commit";    private static enum Mode { INSERT, COMPLETION };    private final List<String> words;    private Mode mode = Mode.INSERT;                public TextAreaDemo() {        super("TextAreaDemo");        initComponents();                textArea.getDocument().addDocumentListener(this);                InputMap im = textArea.getInputMap();        ActionMap am = textArea.getActionMap();        im.put(KeyStroke.getKeyStroke("ENTER"), COMMIT_ACTION);        am.put(COMMIT_ACTION, new CommitAction());                words = new ArrayList<String>(5);        words.add("spark");        words.add("special");        words.add("spectacles");        words.add("spectacular");        words.add("swing");    }            private void initComponents() {        jLabel1 = new JLabel("Try typing 'spectacular' or 'Swing'...");                textArea = new JTextArea();        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);        textArea.setColumns(20);        textArea.setLineWrap(true);        textArea.setRows(5);        textArea.setWrapStyleWord(true);                jScrollPane1 = new JScrollPane(textArea);                GroupLayout layout = new GroupLayout(getContentPane());        getContentPane().setLayout(layout);                //Create a parallel group for the horizontal axis        ParallelGroup hGroup = layout.createParallelGroup(GroupLayout.Alignment.LEADING);        //Create a sequential and a parallel groups	SequentialGroup h1 = layout.createSequentialGroup();        ParallelGroup h2 = layout.createParallelGroup(GroupLayout.Alignment.TRAILING);        //Add a scroll panel and a label to the parallel group h2	h2.addComponent(jScrollPane1, GroupLayout.Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 212, Short.MAX_VALUE);        h2.addComponent(jLabel1, GroupLayout.Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 212, Short.MAX_VALUE);        	//Add a container gap to the sequential group h1	h1.addContainerGap();        // Add the group h2 to the group h1	h1.addGroup(h2);        h1.addContainerGap();        //Add the group h1 to hGroup	hGroup.addGroup(Alignment.TRAILING,h1);        //Create the horizontal group	layout.setHorizontalGroup(hGroup);        	//Create a parallel group for the vertical axis        ParallelGroup vGroup = layout.createParallelGroup(GroupLayout.Alignment.LEADING);        //Create a sequential group	SequentialGroup v1 = layout.createSequentialGroup();        //Add a container gap to the sequential group v1	v1.addContainerGap();        //Add a label to the sequential group v1	v1.addComponent(jLabel1);        v1.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED);        //Add scroll panel to the sequential group v1	v1.addComponent(jScrollPane1, GroupLayout.DEFAULT_SIZE, 100, Short.MAX_VALUE);        v1.addContainerGap();        //Add the group v1 to vGroup	vGroup.addGroup(v1);        //Create the vertical group	layout.setVerticalGroup(vGroup);        pack();            }    // Listener methods        public void changedUpdate(DocumentEvent ev) {    }        public void removeUpdate(DocumentEvent ev) {    }        public void insertUpdate(DocumentEvent ev) {        if (ev.getLength() != 1) {            return;        }                int pos = ev.getOffset();        String content = null;        try {            content = textArea.getText(0, pos + 1);        } catch (BadLocationException e) {            e.printStackTrace();        }                // Find where the word starts        int w;        for (w = pos; w >= 0; w--) {            if (! Character.isLetter(content.charAt(w))) {                break;            }        }        if (pos - w < 2) {            // Too few chars            return;        }                String prefix = content.substring(w + 1).toLowerCase();        int n = Collections.binarySearch(words, prefix);        if (n < 0 && -n <= words.size()) {            String match = words.get(-n - 1);            if (match.startsWith(prefix)) {                // A completion is found                String completion = match.substring(pos - w);                // We cannot modify Document from within notification,                // so we submit a task that does the change later                SwingUtilities.invokeLater(                        new CompletionTask(completion, pos + 1));            }        } else {            // Nothing found            mode = Mode.INSERT;        }    }        private class CompletionTask implements Runnable {        String completion;        int position;                CompletionTask(String completion, int position) {            this.completion = completion;            this.position = position;        }                public void run() {            textArea.insert(completion, position);            textArea.setCaretPosition(position + completion.length());            textArea.moveCaretPosition(position);            mode = Mode.COMPLETION;        }    }        private class CommitAction extends AbstractAction {        public void actionPerformed(ActionEvent ev) {            if (mode == Mode.COMPLETION) {                int pos = textArea.getSelectionEnd();                textArea.insert(" ", pos);                textArea.setCaretPosition(pos + 1);                mode = Mode.INSERT;            } else {                textArea.replaceSelection("\n");            }        }    }       public static void main(String args[]) {        SwingUtilities.invokeLater(new Runnable() {            public void run() {                //Turn off metal's use of bold fonts                UIManager.put("swing.boldMetal", Boolean.FALSE);                new TextAreaDemo().setVisible(true);            }        });    }        }