Author: Nobuo Tamemasa

A cell renderer that shows the cell value in a progress bar fashion using different color codes.

/* (swing1.1) */

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;

/**
 * @version 1.0 03/03/99
 */
public class IndicatorTableExample extends JPanel {
  private static final int MAX = 100;
  private static final int MIN = 0;
  
  public IndicatorTableExample(){
    setLayout(new BorderLayout());
    
    DefaultTableModel dm = new DefaultTableModel() {
      public Class getColumnClass(int col) {
        switch (col) {
          case  0: return String.class;
          case  1: return Integer.class;
          case  2: return Integer.class;
          default: return Object.class;
        }
      }
      public boolean isCellEditable(int row, int col) {
        switch (col) {
          case  2: return false;
          default: return true;
        }
      }  
      public void setValueAt(Object obj, int row, int col) {
        if (col != 1) {
          super.setValueAt(obj, row, col); 
          return;
        }
        try {
          Integer integer = new Integer(obj.toString());
          super.setValueAt(checkMinMax(integer), row, col);
        } catch (NumberFormatException ex) {
          ex.printStackTrace();
        }
      }
    };
    dm.setDataVector(new Object[][]{
      {"not human"   ,new Integer(100),new Integer(100)},
      {"hard worker" ,new Integer( 76),new Integer( 76)},
      {"ordinary guy",new Integer( 51),new Integer( 51)},
      {"lazy fellow" ,new Integer( 12),new Integer( 12)}},
      new Object[]{"Name","Result","Indicator"});
      
    JTable table = new JTable(dm);
    
    IndicatorCellRenderer renderer = new IndicatorCellRenderer(MIN,MAX);
    renderer.setStringPainted(true);
    renderer.setBackground(table.getBackground());
    
    // set limit value and fill color
    Hashtable limitColors = new Hashtable();
    limitColors.put(new Integer( 0), Color.green);
    limitColors.put(new Integer(60), Color.yellow);
    limitColors.put(new Integer(80), Color.red);
    renderer.setLimits(limitColors);
    table.getColumnModel().getColumn(2).setCellRenderer(renderer);
        
    table.getModel().addTableModelListener(new TableModelListener() {
      public void tableChanged(TableModelEvent e) {
        if (e.getType() == TableModelEvent.UPDATE) {
          int col = e.getColumn();
          if (col == 1) {
            int row = e.getFirstRow();
            TableModel model = (TableModel)e.getSource();
            Integer value = (Integer)model.getValueAt(row, col);
            model.setValueAt(checkMinMax(value), row, ++col);
          }
        }
      }
    });
    
    JScrollPane pane = new JScrollPane(table);
    add(pane, BorderLayout.CENTER);
  }

  public static void main(String[] args) {
    JFrame f= new JFrame("IndicatorTable Example");
    f.getContentPane().add(new IndicatorTableExample(), BorderLayout.CENTER);
    f.setSize(400, 120);
    f.setVisible(true);
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}
    });
  }
  
  private Integer checkMinMax(Integer value) {
    int intValue = value.intValue();
    if (intValue < MIN) {
      intValue = MIN;
    } else if (MAX < intValue) {
      intValue = MAX;
    }
    return new Integer(intValue);
  }
}

Download Source Files

Posted On: 8-Mar-1999

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