Monthly ArchiveJune 2006



Java & Programming & Technology 27 Jun 2006 04:53 pm

Changing the Color of a JCheckBox check in a JTable

Ever wanted to change the color of a JCheckBox in a JTable to the table's foreground color? Now you can!

Example Screenshot:
Lower Table has a white check instead of a black check!

This is a renderer for Booleans in a JTable.

PLAIN TEXT
JAVA:
  1. import java.awt.Color;
  2. import java.awt.Component;
  3. import java.awt.Graphics;
  4.  
  5. import javax.swing.JCheckBox;
  6. import javax.swing.JTable;
  7. import javax.swing.table.TableCellRenderer;
  8.  
  9. /**
  10. * This class implements a boolean renderer for a JTable.  It overrides the icon for the CheckBox to draw in the
  11. * foreground color.
  12. */
  13. public class BooleanRenderer extends JCheckBox implements TableCellRenderer {
  14.    public BooleanRenderer() {
  15.        super();
  16.        setHorizontalAlignment(JCheckBox.CENTER);
  17.        setIcon(new ColorableMetalCheckBoxIcon());
  18.    }
  19.  
  20.    public Component getTableCellRendererComponent(JTable table, Object value,
  21.                                                   boolean isSelected, boolean hasFocus, int row, int column) {
  22.        if (isSelected) {
  23.            setForeground(table.getSelectionForeground());
  24.            super.setBackground(table.getSelectionBackground());
  25.        } else {
  26.            setForeground(table.getForeground());
  27.            setBackground(table.getBackground());
  28.        }
  29.        setSelected((value != null && ((Boolean) value).booleanValue()));
  30.        return this;
  31.    }
  32.  
  33.    /**
  34.     * Changes the check box check mark to be the foreground color.<br/>
  35.     * <b>NOTE:</b>This was found here http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4449413 .
  36.     */
  37.    static class ColorableMetalCheckBoxIcon extends javax.swing.plaf.metal.MetalCheckBoxIcon {
  38.        protected void drawCheck(Component c, Graphics g, int x, int y) {
  39.            final Color old = g.getColor();
  40.            g.setColor(c.getForeground());
  41.            super.drawCheck(c, g, x, y);
  42.            g.setColor(old);
  43.        }
  44.    }
  45. }

This is the corresponding Editor.

PLAIN TEXT
JAVA:
  1. import java.awt.Component;
  2.  
  3. import javax.swing.DefaultCellEditor;
  4. import javax.swing.JCheckBox;
  5. import javax.swing.JTable;
  6.  
  7. /**
  8. * This class implements a boolean editor for a JTable.  It overrides the icon for the CheckBox to draw in the
  9. * foreground color.
  10. */
  11. public class BooleanEditor extends DefaultCellEditor {
  12.  
  13.    public BooleanEditor() {
  14.        super(new JCheckBox());
  15.        JCheckBox c = (JCheckBox) getComponent();
  16.        c.setHorizontalAlignment(JCheckBox.CENTER);
  17.        c.setIcon(new BooleanRenderer.ColorableMetalCheckBoxIcon());
  18.    }
  19.  
  20.    public Component getTableCellEditorComponent(JTable table,
  21.                                                 Object value,
  22.                                                 boolean isSelected,
  23.                                                 int row,
  24.                                                 int column) {
  25.        JCheckBox c = (JCheckBox) getComponent();
  26.        if (isSelected) {
  27.            c.setForeground(table.getSelectionForeground());
  28.            c.setBackground(table.getSelectionBackground());
  29.        } else {
  30.            c.setForeground(table.getForeground());
  31.            c.setBackground(table.getBackground());
  32.        }
  33.        c.setSelected((value != null && ((Boolean) value).booleanValue()));
  34.        return c;
  35.    }
  36. }

Quick and Dirty Tester Program!

PLAIN TEXT
JAVA:
  1. import java.awt.Color;
  2. import java.awt.Dimension;
  3. import java.awt.FlowLayout;
  4.  
  5. import javax.swing.*;
  6. import javax.swing.table.AbstractTableModel;
  7. import javax.swing.table.DefaultTableModel;
  8.  
  9. /**
  10. * shows how to use the BooleanEditor and the BooleanRenderer.
  11. */
  12. public class JTableBooleanTester extends JFrame{
  13.     public JTableBooleanTester(){
  14.         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  15.        
  16.         Dimension dim = new Dimension(200,75);
  17.        
  18.        
  19.         TestTableModel ttm = new TestTableModel();
  20.        
  21.         JTable table1 = new JTable(ttm);
  22.         table1.setForeground(Color.WHITE);
  23.         table1.setBackground(Color.DARK_GRAY);
  24.         JScrollPane sp1 = new JScrollPane(table1);
  25.         sp1.setPreferredSize(dim);
  26.        
  27.         JTable table2 = new JTable(ttm);
  28.         table2.setForeground(Color.WHITE);
  29.         table2.setBackground(Color.DARK_GRAY);
  30.         table2.setDefaultEditor(Boolean.class, new BooleanEditor());
  31.         table2.setDefaultRenderer(Boolean.class, new BooleanRenderer());
  32.         JScrollPane sp2 = new JScrollPane(table2);
  33.         sp2.setPreferredSize(dim);
  34.        
  35.         getContentPane().setLayout(new BoxLayout(getContentPane(),BoxLayout.Y_AXIS));
  36.         getContentPane().add(sp1);
  37.         getContentPane().add(sp2);
  38.        
  39.         pack();
  40.     }
  41.  
  42.     public static void main(String[] args) throws Exception {
  43.         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  44.         SwingUtilities.invokeLater(new Runnable(){
  45.             public void run() {
  46.                 JFrame frame = new JTableBooleanTester();
  47.                 frame.setVisible(true);
  48.             }
  49.            
  50.         });
  51.     }
  52.    
  53.     static class TestTableModel extends AbstractTableModel{
  54.         Object[][] data = {{Boolean.TRUE, "Testing 1!"},{Boolean.FALSE,"Testing 2!"}};
  55.         Object[] names = {"Bool", "Something!"};
  56.        
  57.         public int getRowCount() {
  58.             return data.length;
  59.         }
  60.  
  61.         public int getColumnCount() {
  62.            
  63.             return names.length;
  64.         }
  65.  
  66.         public Object getValueAt(int rowIndex, int columnIndex) {
  67.             return data[rowIndex][columnIndex];
  68.         }
  69.        
  70.         public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
  71.             switch(columnIndex){
  72.             case 0:
  73.                 data[rowIndex][columnIndex] = aValue;
  74.             }
  75.             fireTableDataChanged();
  76.         }
  77.        
  78.         public boolean isCellEditable(int rowIndex, int columnIndex) {
  79.             return 0 == columnIndex;
  80.         }
  81.  
  82.         public Class getColumnClass(int columnIndex){
  83.             return data[0][columnIndex].getClass();
  84.         }
  85.     }
  86. }

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Life 25 Jun 2006 09:37 am

Victorian Era vs Now Era

I once had a thought (yes it does happen). I don't know if I read the concept somewhere or if I actually thought it up originally.

It seems we have had a total swapping of signals since the Victorian Era. In the Victorian Era both men and women wanted to be pale. If you were tanned, that meant you spent all your time outside. In this era outside meant hard work in the fields and whatnot.

Nowadays, if you are pale it means that you are hard at work inside an office, factory, etc. If you are tanned, it means you are sitting around outside doing nothing at the beach, pool, etc.

I don't want to take away from our farmers, construction workers, and produce pickers. These are important jobs. They still get tan from hard work outside. I was talking about the rich folk, who do nothing all day (*cough*P. Hilton*cough*).

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Life & Technology 24 Jun 2006 01:37 pm

Life in Paradise

First off, No, this is not a post on heaven or hell.

I was in the grocery store this morning and on the radio (or intercom or whatever it is you call a speaker system in the grocery store) was playing "Big Yellow Taxi" by the Counting Crows featuring Vanessa Carlton.

This music got me thinking. Paradise, as defined by me and others I have heard, is located in Hawaii or somewhere in the Caribbean. It has sandy beaches and warm water. The sun shines everyday and warm rains fall for short periods.

Now my thought: Do I want to live there everyday, all day, all my life? Yes, it is a nice place to visit, relax and enjoy. Sounds like a great vacation spot. But to live there continuously?

Would I have to give up my access to technology?  Such as mp3 players, computers, and even cars?  Is it our technology that does all the bad stuff in the world?

I don't know.  I just think "Paradise" is a nice place to visit.  But I like my tech.

[Nerd Alert]I hope for a day where we can live like Star Trek--all cool fancy tech, but with little or no consequence to the environment.[/Nerd Alert]

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Uncategorized 24 Jun 2006 12:57 pm

Hello World and all that Jazz

I would welcome you to my blog. My home away from... no no, this is just a place for me to post my thoughts. These thoughts will come at random times. Many might appear in one day, possibly none for a year.

So if you like reading random thoughts, you might like reading my stuff. If you hate thoughts that may make no sense, then why are you here?

Hope you enjoy this little corner of the global harddrive.

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