Source Code : Scrollpane ruler

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Scrollpane ruler

 
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Rectangle;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;

public class HeaderDemo extends JFrame {
  private JLabel label = new JLabel(new ImageIcon("largeJava2sLogo.gif"));

  public HeaderDemo() {
    super("JScrollPane Demo");
    JScrollPane scrollPane = new JScrollPane(label);

    JLabel[] corners = new JLabel[4];
    for (int i = 0; i < 4; i++) {
      corners[i] = new JLabel();
      corners[i].setBackground(Color.white);
      corners[i].setOpaque(true);
    }

    JLabel rowheader = new JLabel() {
      public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Rectangle rect = g.getClipBounds();
        for (int i = 50 - (rect.y % 50); i < rect.height; i += 50) {
          g.drawLine(0, rect.y + i, 3, rect.y + i);
          g.drawString("" + (rect.y + i), 6, rect.y + i + 3);
        }
      }

      public Dimension getPreferredSize() {
        return new Dimension(25, (int) label.getPreferredSize()
            .getHeight());
      }
    };
    rowheader.setBackground(Color.white);
    rowheader.setOpaque(true);

    JLabel columnheader = new JLabel() {

      public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Rectangle r = g.getClipBounds();
        for (int i = 50 - (r.x % 50); i < r.width; i += 50) {
          g.drawLine(r.x + i, 0, r.x + i, 3);
          g.drawString("" + (r.x + i), r.x + i - 10, 16);
        }
      }

      public Dimension getPreferredSize() {
        return new Dimension((int) label.getPreferredSize().getWidth(),
            25);
      }
    };
    columnheader.setBackground(Color.white);
    columnheader.setOpaque(true);

    scrollPane.setRowHeaderView(rowheader);
    scrollPane.setColumnHeaderView(columnheader);
    scrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, corners[0]);
    scrollPane.setCorner(JScrollPane.LOWER_RIGHT_CORNER, corners[1]);
    scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, corners[2]);
    scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, corners[3]);

    getContentPane().add(scrollPane);
    setSize(400, 300);
    setVisible(true);
  }

  public static void main(String[] args) {
    new HeaderDemo();
  }
}
           
         
  

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