I'm clarifying my earlier problem by providing some sample code
import java.awt.Color;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class TestTable extends javax.swing.JFrame
{
private JButton jButton1;
private JScrollPane jScrollPane1;
private JTable jTable1;
public TestTable()
{
initComponents();
}
private void initComponents(){
///////////////////////////////////////////////
//Initializing components
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
String data[][] = { {"A","B","C"},
{"R","S","T"},
{"U","V","W"}
};
String col[] = {"X","Y","Z"};
jTable1 = new JTable(new DefaultTableModel(data, col));
jScrollPane1.setViewportView(jTable1);
jButton1.setText("jButton1");
///////////////////////////////////////////////
//positioning button and table
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap(15, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 375, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jButton1)
.addGap(160, 160, 160))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 117, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(47, 47, 47)
.addComponent(jButton1)
.addContainerGap(102, Short.MAX_VALUE))
);
///////////////////////////////////////////////
//create event callback for the button
jButton1.setText("Change data & color");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
///////////////////////////////////////////////
pack();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
//change the data in the table
String data[][] = { {"a","b","c"},
{"r","s","t"},
{"u","v","w"} };
String col[] = {"x","y","z"};
DefaultTableModel model= new DefaultTableModel(data,col);
jTable1.setModel(model);
//change the header in the table
jTable1.getTableHeader().setBackground(Color.red);
// IS IT POSSIBLE TO INSERT CODE HERE, WITHOUT REINITIALIZING jTable1,
// SO THAT CLICKING THE BUTTON WILL TURN THE MIDDLE ROW GREEN?
//change button text
jButton1.setText("Changed");
}
public static void main(String[] args)
{
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new TestTable().setVisible(true);
}
});
}
}
I've been able to change the colors of the rows when I run TestTable in main, but I am having problems with changing the rows colors from within a callback (as above). My guess was to insert code like
jTable1.getCellRenderer(0, 0).getTableCellRendererComponent(jTable1, String.class, false,false, 0,0).setBackground(Color.green);
Since I am specifying entry (0,0) of the table in this code, I would expect that this code would turn entry (0,0), however, this turns the entire table green! Note, I can change the data in the model and the color of the header without any problems.
Any help sincerely appreciated. Thanks Chris
Using a TableCellRenderer is still what you want even with your updated question (as @Ryan said). You're just going to want to put in some special code to indicate what rows you want specially colored. Here's an example (using your test code):
import java.awt.Color;
import java.awt.Component;
import java.util.HashMap;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class TestTable extends javax.swing.JFrame
{
private JButton jButton1;
private JScrollPane jScrollPane1;
private JTable jTable1;
private CustomRenderer renderer;
public TestTable()
{
initComponents();
}
private void initComponents(){
///////////////////////////////////////////////
//Initializing components
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
String data[][] = { {"A","B","C"},
{"R","S","T"},
{"U","V","W"}
};
String col[] = {"X","Y","Z"};
jTable1 = new JTable(new DefaultTableModel(data, col));
//Setup Renderer
renderer = new CustomRenderer();
//Add Renderer to table
jTable1.getColumnModel().getColumn(0).setCellRenderer(renderer);
jTable1.getColumnModel().getColumn(1).setCellRenderer(renderer);
jTable1.getColumnModel().getColumn(2).setCellRenderer(renderer);
jScrollPane1.setViewportView(jTable1);
jButton1.setText("jButton1");
///////////////////////////////////////////////
//positioning button and table
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap(15, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 375, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jButton1)
.addGap(160, 160, 160))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 117, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(47, 47, 47)
.addComponent(jButton1)
.addContainerGap(102, Short.MAX_VALUE))
);
///////////////////////////////////////////////
//create event callback for the button
jButton1.setText("Change data & color");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
///////////////////////////////////////////////
pack();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
DefaultTableModel model= (DefaultTableModel)jTable1.getModel();
//change the data in the table
String data[][] = { {"a","b","c"},
{"r","s","t"},
{"u","v","w"} };
String col[] = {"x","y","z"};
model.setDataVector(data, col);
// Necessary to re-add listener (because we're creating new columns)
jTable1.getColumnModel().getColumn(0).setCellRenderer(renderer);
jTable1.getColumnModel().getColumn(1).setCellRenderer(renderer);
jTable1.getColumnModel().getColumn(2).setCellRenderer(renderer);
//change the header in the table
jTable1.getTableHeader().setBackground(Color.red);
// IS IT POSSIBLE TO INSERT CODE HERE, WITHOUT REINITIALIZING jTable1,
// SO THAT CLICKING THE BUTTON WILL TURN THE MIDDLE ROW GREEN?
renderer.colorModel.put(1, Color.green); //Yes
//change button text
jButton1.setText("Changed");
}
public static void main(String[] args)
{
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new TestTable().setVisible(true);
}
});
}
//Custom Renderer - does the default rendering except if told the row should be a different color
public static class CustomRenderer extends DefaultTableCellRenderer{
//Stores what color you want for rows
public HashMap<Integer, Color> colorModel = new HashMap<Integer, Color>();
@Override
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus, int row,
int column) {
//Default Rendering
Component result = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
//Change color of background (If necessary)
if(colorModel.get(row) != null){
setBackground(colorModel.get(row));
} else if(!isSelected){
setBackground(null);
}
return result;
}
}
}