Source Code : TabbedPane Sample 2

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TabbedPane Sample 2

 
/*
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);
  }
}

           
         
  

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