TabbedPaneSample.java Source code

Introduction

Here is the source code for TabbedPaneSample.java

Source

/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski       
ISBN: 1-893115-78-X
Publisher: APress
*/

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Polygon;

import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTabbedPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class TabbedPaneSample {
    static Color colors[] = { Color.red, Color.orange, Color.yellow, Color.green, Color.blue, Color.magenta };

    static void add(JTabbedPane tabbedPane, String label) {
        int count = tabbedPane.getTabCount();
        JButton button = new JButton(label);
        button.setBackground(colors[count]);
        tabbedPane.addTab(label, new DiamondIcon(colors[count]), button, label);
    }

    public static void main(String args[]) {
        String title = (args.length == 0 ? "Tabbed Pane Sample" : args[0]);
        JFrame frame = new JFrame(title);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTabbedPane tabbedPane = new JTabbedPane();
        String titles[] = { "General", "Security", "Content", "Connection", "Programs", "Advanced" };
        for (int i = 0, n = titles.length; i < n; i++) {
            add(tabbedPane, titles[i]);
        }

        ChangeListener changeListener = new ChangeListener() {
            public void stateChanged(ChangeEvent changeEvent) {
                JTabbedPane sourceTabbedPane = (JTabbedPane) changeEvent.getSource();
                int index = sourceTabbedPane.getSelectedIndex();
                System.out.println("Tab changed to: " + sourceTabbedPane.getTitleAt(index));
            }
        };
        tabbedPane.addChangeListener(changeListener);

        Container contentPane = frame.getContentPane();
        contentPane.add(tabbedPane, BorderLayout.CENTER);
        frame.setSize(400, 150);
        frame.setVisible(true);
    }
}

class DiamondIcon implements Icon {
    private Color color;

    private boolean selected;

    private int width;

    private int height;

    private Polygon poly;

    private static final int DEFAULT_WIDTH = 10;

    private static final int DEFAULT_HEIGHT = 10;

    public DiamondIcon(Color color) {
        this(color, true, DEFAULT_WIDTH, DEFAULT_HEIGHT);
    }

    public DiamondIcon(Color color, boolean selected) {
        this(color, selected, DEFAULT_WIDTH, DEFAULT_HEIGHT);
    }

    public DiamondIcon(Color color, boolean selected, int width, int height) {
        this.color = color;
        this.selected = selected;
        this.width = width;
        this.height = height;
        initPolygon();
    }

    private void initPolygon() {
        poly = new Polygon();
        int halfWidth = width / 2;
        int halfHeight = height / 2;
        poly.addPoint(0, halfHeight);
        poly.addPoint(halfWidth, 0);
        poly.addPoint(width, halfHeight);
        poly.addPoint(halfWidth, height);
    }

    public int getIconHeight() {
        return height;
    }

    public int getIconWidth() {
        return width;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.setColor(color);
        g.translate(x, y);
        if (selected) {
            g.fillPolygon(poly);
        } else {
            g.drawPolygon(poly);
        }
        g.translate(-x, -y);
    }
}