Thread: Extending DefaultTableCellRenderer issue

I want to change the color of a row in my table and i also need to be able to change the color of that row back to the standard white color. I am invoking setRowColor() on my CustomTableCellRenderer-object and its working fine. however, after i have done a color-change on a row it is not possible to highlight that row anymore by dragging the mouse over the cells which is a problem. What am i missing? Thanks!

edit: yes, sorry about that, im new here. anyway, here's the code for the CustomTableCellRenderer and a class with main() to run. Ive added some buttons to do the color changing and as you see the rows that have been exposed to color-change can no longer be highlighted if you drag your mouse over the cells.

if(isSelected) {
cell.setBackground(table.getSelectionBackground()) ;
}

is not working for some reason. Thank you for your help!


CusomtTableCellRenderer.java :

import java.awt.Color;
import java.awt.Component;
import java.util.HashMap;
import java.util.Map;
 
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
 
class CustomTableCellRenderer extends DefaultTableCellRenderer {
 
        private Map<Integer, Color> mapColors;
 
 
        public CustomTableCellRenderer() {
           mapColors = new HashMap<Integer, Color>();
        }
 
        public void setRowColor(int row, Color color) {
            mapColors.put(row, color);
 
        }
 
        @Override
        public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus, int row, int column) {
 
        	Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, 1);
        	Color color = mapColors.get(row);
        	if (color != null  ) {
 
        	    cell.setBackground(color);
        	} else {
 
        	    if(isSelected) {
        	        cell.setBackground(table.getSelectionBackground());
 
 
 
        	    }
 
        	    else {
        	        cell.setBackground(table.getBackground());
 
 
        	    }
 
        	}
        	return cell;
 
        }
    }

RunThis.java :

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
 
 
public class RunThis extends JFrame implements ActionListener{
 
	JTable table;
	JPanel panel;
	JScrollPane pane;
	CustomTableCellRenderer cell;
	JButton setRed, setWhite;
 
	public RunThis() {
 
		table = new JTable(50,2);
		pane = new JScrollPane(table);
		panel = new JPanel();
		panel.add(pane);
		add(panel, BorderLayout.CENTER);
 
 
		setRed = new JButton("Set red color");
		setRed.addActionListener(this);
		setRed.setActionCommand("red");
		add(setRed,BorderLayout.SOUTH);
 
		setWhite = new JButton("Set white color");
		setWhite.addActionListener(this);
		setWhite.setActionCommand("white");
		add(setWhite,BorderLayout.NORTH);
 
		cell = new CustomTableCellRenderer();
 
 
		for(int i=0; i<table.getColumnCount(); i++) {
			table.getColumnModel().getColumn(i).setCellRenderer(cell);
		}
 
 
 
		pack();
		setLocationRelativeTo(null);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
	}
 
 
	public static void main(String[] args) {
		RunThis obj = new RunThis();
	}
 
 
	@Override
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand() == "red") {
			for(int i=0; i<table.getRowCount(); i++) {
				if(table.isRowSelected(i)) {
					cell.setRowColor(i, Color.RED);
		}
			}
		}
		if(e.getActionCommand() == "white") {
			for(int i=0; i<table.getRowCount(); i++) {
				if(table.isRowSelected(i)) {
					cell.setRowColor(i, Color.WHITE);
		}
 
	}
		}
	}
}

Can you make a small complete program that compiles and executes and shows the problem?

Please edit your post and wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

Sorry about not seeing the update. The site does not send me emails so I look at the last posts on the threads to see if there has been any activity. When an earlier post is updated, I don't see it.
I'll look at this tomorrow.

Does the mouse selection action work as desired when cell color has been set? Or does it only work for cells that have not had their color changed? When you change the color, I don't know if JTable looks at the new color to see if it is the same as the default color. So if you set the color to white it should display the same as when the color is changed to red.

I'm glad it was an easy fix.