Mega Code Archive
Add KeyStroke to JTextArea
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/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
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* are met:
*
* - Redistributions of source code must retain the above copyright
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*
* - 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
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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/*
* TextAreaDemo.java requires no other files.
*/
import java.awt.event.ActionEvent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.GroupLayout;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.LayoutStyle;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.GroupLayout.Alignment;
import javax.swing.GroupLayout.ParallelGroup;
import javax.swing.GroupLayout.SequentialGroup;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
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);
}
});
}
}
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