Best books about JAVA programming:

• Head First JAVA, Second Editon
• Effective Java Programming Language Guide
• Professional Java, JDK 5 Edition
• Ivor Horton's Beginning Java 2, JDK 5 Edition

JAVA JTabbedPane

This example shows how to add mnemonic to JTabbedPane header. This example has 2 java files: MnemonicTabbedPaneExample.java and MnemonicTabbedPane.java

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.metal.*;
import javax.swing.plaf.basic.*;

public class MnemonicTabbedPane extends JTabbedPane {
Hashtable mnemonics = null;
int condition;

public MnemonicTabbedPane() {
setUI(new MnemonicTabbedPaneUI());
mnemonics = new Hashtable();

setMnemonicCondition(WHEN_IN_FOCUSED_WINDOW);
}

public void setMnemonicAt(int index, char c) {
int key = (int)c;
if ('a' <= key && key <='z') {
key -= ('a' - 'A');
}
setMnemonicAt(index, key);
}

public void setMnemonicAt(int index, int keyCode) {
ActionListener action = new MnemonicAction(index);
KeyStroke stroke = KeyStroke.getKeyStroke(keyCode, ActionEvent.ALT_MASK);
registerKeyboardAction(action, stroke, condition);
mnemonics.put(new Integer(index), new Integer(keyCode));
}

public int getMnemonicAt(int index) {
int keyCode = 0;
Integer m = (Integer)mnemonics.get(new Integer(index));
if (m != null) {
keyCode = m.intValue();
}
return keyCode;
}

public void setMnemonicCondition(int condition) {
this.condition = condition;
}

public int getMnemonicCondition() {
return condition;
}

class MnemonicAction implements ActionListener {
int index;

public MnemonicAction(int index) {
this.index = index;
}

public void actionPerformed(ActionEvent e) {
MnemonicTabbedPane tabbedPane = (MnemonicTabbedPane)e.getSource();
tabbedPane.setSelectedIndex(index);
tabbedPane.requestFocus();
}
}

class MnemonicTabbedPaneUI extends MetalTabbedPaneUI {
protected void paintText(Graphics g, int tabPlacement,
Font font, FontMetrics metrics, int tabIndex,
String title, Rectangle textRect,
boolean isSelected) {
g.setFont(font);
MnemonicTabbedPane mtabPane = (MnemonicTabbedPane)tabPane;
if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {
g.setColor(tabPane.getForegroundAt(tabIndex));
BasicGraphicsUtils.drawString(g,title, mtabPane.getMnemonicAt(tabIndex),
textRect.x,
textRect.y + metrics.getAscent());
} else {
g.setColor(tabPane.getBackgroundAt(tabIndex).brighter());
BasicGraphicsUtils.drawString(g,title, mtabPane.getMnemonicAt(tabIndex),
textRect.x,
textRect.y + metrics.getAscent());
g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
BasicGraphicsUtils.drawString(g,title, mtabPane.getMnemonicAt(tabIndex),
textRect.x - 1,
textRect.y + metrics.getAscent() - 1);
}
}
}
}