Source Code : Table header: Label Header with icon

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Table header: Label Header with icon

  
/*
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.Graphics;
import java.awt.Polygon;

import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class LabelHeaderSample {
  public static void main(String args[]) {
    Object rows[][] = { { "one", "ichi - u4E00" },
        { "two", "ni - u4E8C" }, { "three", "san - u4E09" },
        { "four", "shi - u56DB" }, { "five", "go - u4E94" },
        { "six", "roku - u516D" }, { "seven", "shichi - u4E03" },
        { "eight", "hachi - u516B" }, { "nine", "kyu - u4E5D" },
        { "ten", "ju - u5341" } };
    JFrame frame = new JFrame("Label Header");
    String headers[] = { "English", "Japanese" };
    JTable table = new JTable(rows, headers);
    JScrollPane scrollPane = new JScrollPane(table);

    Icon redIcon = new DiamondIcon(Color.red);
    Icon blueIcon = new DiamondIcon(Color.blue);

    Border headerBorder = UIManager.getBorder("TableHeader.cellBorder");

    JLabel blueLabel = new JLabel(headers[0], blueIcon, JLabel.CENTER);
    blueLabel.setBorder(headerBorder);
    JLabel redLabel = new JLabel(headers[1], redIcon, JLabel.CENTER);
    redLabel.setBorder(headerBorder);

    TableCellRenderer renderer = new JComponentTableCellRenderer();

    TableColumnModel columnModel = table.getColumnModel();

    TableColumn column0 = columnModel.getColumn(0);
    TableColumn column1 = columnModel.getColumn(1);

    column0.setHeaderRenderer(renderer);
    column0.setHeaderValue(blueLabel);

    column1.setHeaderRenderer(renderer);
    column1.setHeaderValue(redLabel);

    frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 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);
  }
}

class JComponentTableCellRenderer implements TableCellRenderer {
  public Component getTableCellRendererComponent(JTable table, Object value,
      boolean isSelected, boolean hasFocus, int row, int column) {
    return (JComponent) value;
  }
}

           
         
    
  

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