color in cell

[ben riches]

Hello All,
I want to know how I can change the color of my cells when they gain focus. As at the moment when I click into one of my cells the border of that cell is yellow, and when I start typing in that cell the border then changes to black. I want it so that when I click into that cell it is black aswell.
How can I do this?
Thanks
Ben
Here is my code for my JTable

try {
int j=1;
      String[][] data = new String[j][2];
      for (int k=0; k<j; k++){
         String[] row = {"",""};
         data[k] = row;
      }
String[] columnNames = {"Table Name","Column Name"};
ivjScrollPaneTable = new javax.swing.JTable(data, columnNames);

ivjScrollPaneTable.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
JTableHeader anHeader = ivjScrollPaneTable.getTableHeader();
ivjScrollPaneTable.getTableHeader().setForeground(java.awt.Color.blue);
ivjScrollPaneTable.getTableHeader().setFont( new Font( "Arial", Font.BOLD, 12 ) );
ivjScrollPaneTable.setSelectionForeground(java.awt.Color.black);
ivjScrollPaneTable.setForeground(java.awt.Color.black);
ivjScrollPaneTable.setGridColor(java.awt.Color.black);
ivjScrollPaneTable.setSelectionBackground(java.awt.Color.white);
ivjScrollPaneTable.setToolTipText("Please enter the Table and coulmn names that you want your data to be inserted to. Please refer to the help page for help.");
ivjScrollPaneTable.setName("ScrollPaneTable");
ivjScrollPaneTable.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_ALL_COLUMNS);
ivjScrollPaneTable.setBounds(0, 0, 450, 400);
JScrollPane scrollPane = new JScrollPane(ivjScrollPaneTable);
ivjScrollPaneTable.setPreferredScrollableViewportSize(new Dimension(500, 70)); 

And here is my code for the scrollpane:

ivjJScrollPane1 = new javax.swing.JScrollPane();

ivjJScrollPane1.setName("JScrollPane1");
ivjJScrollPane1.setVerticalScrollBarPolicy(javax.swing.JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
ivjJScrollPane1.setHorizontalScrollBarPolicy(javax.swing.JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
ivjJScrollPane1.setBackground(java.awt.Color.lightGray);
ivjJScrollPane1.setForeground(java.awt.Color.green);
ivjJScrollPane1.setFont(new java.awt.Font("Arial", 1, 12));
ivjJScrollPane1.setBounds(266, 60, 468, 459);
ivjJScrollPane1.setMinimumSize(new java.awt.Dimension(222, 226));
getJScrollPane1().setViewportView(getScrollPaneTable());

[Don Kiddick]

You need to create your own implementation of TableCellRenderer. Consider extending DefaultTableCellRenderer.
Does that help ?
D.

[ben riches]

Originally posted by Don Kiddick:
You need to create your own implementation of TableCellRenderer. Consider extending DefaultTableCellRenderer.
Does that help ?
D.

How and where would I put that in my code?
Thanks
Ben

[Don Kiddick]

To create the renderer :

class MyTableCellRenderer extends DefaultTableCellRenderer {
  //override getTableCellRendererComponent
}
 

Then in you code that creates you JTable :

 
myTable.setDefaultRenderer( Object.class, new MyTableCellRenderer() );

Check this out for more information.

hope that helps,
D.

[ben riches]

Originally posted by Don Kiddick:
To create the renderer :

class MyTableCellRenderer extends DefaultTableCellRenderer {
  //override getTableCellRendererComponent
}
 

Then in you code that creates you JTable :

 
myTable.setDefaultRenderer( Object.class, new MyTableCellRenderer() );

Check this out for more information.

hope that helps,
D.

Hello Don,
I have had a look at the page you gave me but im still having trouble with it.
Here is some code to make a simple JTable.
Could you show me where I should and how to create the Cell Renderer

import javax.swing.table.JTableHeader;
import javax.swing.table.TableModel;
import javax.swing.text.html.*;
import java.net.*;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.util.List;
import javax.swing.*;
import javax.swing.filechooser.FileFilter;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.*;
import java.lang.*;
import java.util.StringTokenizer.*;
import java.sql.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.DefaultTableCellRenderer;
public class si2 extends javax.swing.JFrame implements ActionListener {
JTextField name = new JTextField(15);
JTextField number1 = new JTextField(15);
public si2() {
super("DataBase Loader");
setSize(1025, 740);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pane = new JPanel();
JPanel pane1 = new JPanel();
JPanel pane2 = new JPanel();
JPanel pane3 = new JPanel();
JPanel pane4 = new JPanel();
pane.setLayout(new GridLayout(20, 1));
pane1.setLayout(new BorderLayout());
int j = 1;
String[][] data = new String[j][2];
for (int k = 0; k < j; k++) {
String[] row = {"", ""};
data[k] = row;
}
String[] columnNames = {"First Name", "Last Name"};
final JTable perstab = new JTable();
perstab.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
DefaultTableModel model2 = new DefaultTableModel(data, columnNames);
perstab.setModel(model2); 
perstab.setSelectionForeground(java.awt.Color.black);
perstab.setForeground(java.awt.Color.black);
perstab.setGridColor(java.awt.Color.black);
perstab.setSelectionBackground(java.awt.Color.white);
perstab.setPreferredScrollableViewportSize(new Dimension(500, 500));
JScrollPane scrollPane = new JScrollPane(perstab);
pane1.add(new JPanel(), BorderLayout.EAST);
JButton btn = new JButton("What are the names?");
btn.addActionListener(this);
btn.putClientProperty("DATABASE", perstab);
pane1.add(new JPanel().add(btn), BorderLayout.SOUTH);
pane2.add(name);
pane3.add(number1);
pane.add(pane2);
pane.add(pane3);
pane1.add(pane, BorderLayout.WEST);
pane4.add(scrollPane);
pane1.add(pane4, BorderLayout.CENTER);
setContentPane(pane1);
number1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println(perstab.getModel().getClass());
((DefaultTableModel)perstab.getModel()).setColumnCount(Integer.parseInt(number1.getText()));
}
}
);
show();
}
public static void main(String[] args) {
si2 frame = new si2();
frame.setVisible(true);
}

    public void actionPerformed(ActionEvent e) {
        JTable table = (JTable)((JButton)e.getSource()).getClientProperty("DATABASE");
        TableModel model = table.getModel();
        int count = model.getRowCount();
        String[] firstnames = new String[count];
        String[] lastnames = new String[count];
        for (int i=0; i < count; i++) { 
           firstnames[i] = (String)model.getValueAt(i, 0);
            System.out.println("first name at row " + i + ": " + firstnames[i]);
            lastnames[i] = (String)model.getValueAt(i, 1);
            System.out.println("lastname name at row " + i + ": " + lastnames[i]);
        }
    }
}

Thnaks
Ben

[Don Kiddick]

Ok, lets start with the renderer. You need to create a new class like this :
class MyTableCellRenderer extends DefaultTableCellRenderer
Then you need to override getTableCellRendererComponent in your new class. Have a look at the API documentation for TableCellRenderer and the link I posted before. Have a go at writing the getTableCellRendererComponent method then post your code and we can discuss it.
D.

[ben riches]

import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
import java.awt.*;
public class MyTableCellRenderer extends
DefaultTableCellRenderer
{
public MyTableCellRenderer ()
{
setOpaque (true);
}
public Component getTableCellRendererComponent (JTable table,
Object value,
boolean isSelected,
boolean isFocused,
int row, int column)
{
String s;
if (value != null)
s = value.toString();
else
s = "";
setText(s);
if (column == 0)
setHorizontalAlignment(CENTER);
if (isSelected ||  isFocused) {
setBackground(table.getSelectionBackground());
setForeground(table.getSelectionForeground());
setFont(new Font("Dialog", Font.BOLD, 12));
}
else {
setBackground(new Color(255,255,255)); // white
setForeground(new Color(0,0,0)); // black
setFont(new Font("Dialog", Font.PLAIN, 12));
}
return this;
}
}

[ March 01, 2004: Message edited by: ben riches ]

[Don Kiddick]

Excellent stuff !
All you need to do know is to say,
if( isFocused )
setBorder( black border );
else
setBorder( normal border );
Like this :

 
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.JTable;
import javax.swing.border.Border;
import javax.swing.table.DefaultTableCellRenderer;
class MyTableCellRenderer extends DefaultTableCellRenderer    {
        
        private final static Border FOCUS_BORDER = BorderFactory.createLineBorder(Color.BLACK);
        
        public MyTableCellRenderer(){
            setOpaque(true);
        }
        
        public Component getTableCellRendererComponent(
        JTable table,
        Object value,
        boolean isSelected,
        boolean isFocused,
        int row,
        int column){
            String s;
            if (value != null)
                s = value.toString();
            else
                s = "";
            setText(s);
            if (column == 0)
                setHorizontalAlignment(CENTER);
            if (isSelected) {
                setBackground(table.getSelectionBackground());
                setForeground(table.getSelectionForeground());
                setFont(new Font("Dialog", Font.BOLD, 12));
            } else {
                setBackground(new Color(255,255,255)); // white
                setForeground(new Color(0,0,0)); // black 
                setFont(new Font("Dialog", Font.PLAIN, 12));
            }
            
            setBorder( isFocused ? FOCUS_BORDER : DefaultTableCellRenderer.noFocusBorder );
            return this;
        }
 

D.

[Don Kiddick]

I've made a few more changes here to improve readability, flexibility and performance.

 
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.JTable;
import javax.swing.border.Border;
import javax.swing.table.DefaultTableCellRenderer;
class MyTableCellRenderer extends DefaultTableCellRenderer    {
        
        private final static Border FOCUS_BORDER = BorderFactory.createLineBorder(Color.BLACK);
        private final static Font SELECTED_FONT = new Font("Dialog", Font.BOLD, 12);
        private final static Font UNSELECTED_FONT = new Font("Dialog", Font.PLAIN, 12);
        
        public MyTableCellRenderer(){
            setOpaque(true);
        }
        
        public Component getTableCellRendererComponent(
        JTable table,
        Object value,
        boolean isSelected,
        boolean isFocused,
        int row,
        int column){
            setText(value == null ? "" : value.toString());
            
            if (column == 0) 
                setHorizontalAlignment(CENTER);
            
            if (isSelected) {
                setBackground(table.getSelectionBackground());
                setForeground(table.getSelectionForeground());
                setFont(SELECTED_FONT);
            } else {
                setBackground(table.getBackground()); 
                setForeground(table.getForeground()); 
                setFont(UNSELECTED_FONT);
            }
            
            setBorder( isFocused ? FOCUS_BORDER : DefaultTableCellRenderer.noFocusBorder );
            return this;
        }
        
    }
 

let me know if it doesn't make sense.
D.

[ben riches]

Hello Don,
Thanks for your help so far.
How do I use that class in my code so that I get that color to work with my JTable?
Thanks
Ben

[Don Kiddick]

table.setDefaultRenderer( Object.class, new MyTableCellRenderer() );