Why does my Java custom cell renderer not show highlighting when the row/cell is selected?

Question

I have a custom cell renderer for a cell to do a word wrap so more content can be read. Here is the code:

import java.awt.Color;
import java.awt.Component;
import java.awt.Insets;

import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.table.TableCellRenderer;

public class TextWrapCellRenderer extends JTextArea implements TableCellRenderer {
    private static final long serialVersionUID = 1L;

    public TextWrapCellRenderer() {
        setLineWrap(true);
        setWrapStyleWord(true);
        setMargin(new Insets(0, 5, 0, 5));
        setSelectionColor(Color.GREEN);
    }

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        setText((String)value);
        setSize(table.getColumnModel().getColumn(column).getWidth(),getPreferredSize().height);
        setSelectionColor(Color.GREEN);

        return this;
    }
}

Update: The cell renderer is used properly but when the user selects a row in the JTable, then it only shows the highlighting for the non-custom rendered cells. The highlighting shows for all other cells for that row though. This leaves just one cell with a white background while the rest of the row has blue (in my case) as the highlighted background color.

Answer 1

You have to check the isSelected argument to see if the cell is selected or not, something like:

public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) 
{
        setText((String)value);
        setSize(table.getColumnModel().getColumn(column).getWidth(),getPreferredSize().height);
        setSelectionColor(Color.GREEN);

        if (isSelected)
        {
            setBackground(table.getSelectionBackground());
            setForeground(table.getSelectionForeground());
        }
        else
        {
            setBackground(table.getBackground());
            setForeground(table.getForeground());
        }
        return this;
    }