Question

puuuuuuf, I’m starting to like swing 🙂 I’m trying to write a cellRenderer to customy render all cells besides those which in first row and column. So I wrote the following:

public class CustomTableCellRenderer extends DefaultTableCellRenderer {
        public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus, int row, int column) {
            Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, column);

            if(row >0&&column>0){
                cell.setBackground(Color.GREEN);
            }

            return cell;
        }
    }

and set the renderer as following:

scheduleTable.setDefaultRenderer(Object.class, new CustomTableCellRenderer()); 

but for some reason such an approach applies renderer to all the cell. So all of them are Green. If I’m doing something wrong, could you help me with that please?

Thanks in advance!

ADDITION

scheduleTable = new JTable() {
                    @Override
                    public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                        Component comp = super.prepareRenderer(renderer, row, column);
                        int modelRow = convertRowIndexToModel(row);
                        int modelColumn = convertColumnIndexToModel(column);
                        if (modelColumn != 0 && modelRow != 0) {
                            comp.setBackground(Color.GREEN);
                        }
                        return comp;
                    }
                };  

this code makes all the table green as well.

This code:

scheduleTable = new JTable(tableModel) {
                    @Override
                    public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                        Component comp = super.prepareRenderer(renderer, row, column);
                        int modelRow = convertRowIndexToModel(row);
                        int modelColumn = convertColumnIndexToModel(column);

                            if (modelRow != 0 && modelColumn != 0) {
                                setBackground(Color.GREEN);
                            } else {
                                setBackground(Color.WHITE);
                            }

                        return comp;
                    }
                };

gives me the following result ;(

The following situations I have with differents n in expression row != 0 && column != 0:

Answer 1

• you can use prepareRenderer, is easiest and more confortable that XxxCellRenderer

• great code example is Table Row Rendering by @camickr

EDIT:

if (modelColumn != 0 || modelRow != 0) {

and with if (modelColumn != 0 && modelRow != 0) {

from code

import java.awt.*;
import java.awt.font.TextAttribute;
import java.util.Map;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.MatteBorder;
import javax.swing.table.*;

public class TablePrepareRenderer extends JFrame {

    private static final long serialVersionUID = 1L;
    private JTable table;

    public TablePrepareRenderer() {
        Object[] columnNames = {"Type", "Company", "Shares", "Price", "Boolean"};
        Object[][] data = {
            {"Buy", "IBM", new Integer(1000), new Double(80.50), false},
            {"Sell", "MicroSoft", new Integer(2000), new Double(6.25), true},
            {"Sell", "Apple", new Integer(3000), new Double(7.35), true},
            {"Buy", "Nortel", new Integer(4000), new Double(20.00), false}
        };
        DefaultTableModel model = new DefaultTableModel(data, columnNames) {

            private static final long serialVersionUID = 1L;

            @Override
            public Class getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        table = new JTable(model) {

            private static final long serialVersionUID = 1L;
            private Border outside = new MatteBorder(1, 0, 1, 0, Color.red);
            private Border inside = new EmptyBorder(0, 1, 0, 1);
            private Border highlight = new CompoundBorder(outside, inside);

            @Override
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                int modelRow = convertRowIndexToModel(row);
                int modelColumn = convertColumnIndexToModel(column);
                if (!isRowSelected(modelRow)) {
                    if (modelColumn != 0 || modelRow != 0) {
                        comp.setBackground(Color.GREEN);
                    } else {
                        comp.setBackground(table.getBackground());
                    }
                }
                return comp;

                /*Component comp = super.prepareRenderer(renderer, row, column);
                JComponent jc = (JComponent) comp;
                Map attributes = (new Font("Serif", Font.PLAIN, 12)).getAttributes();
                //attributes.put(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD);
                attributes.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
                if (!isRowSelected(row)) {
                comp.setForeground(Color.black);
                comp.setBackground(row % 2 == 0 ? Color.white : Color.orange);
                int modelRow = convertRowIndexToModel(row);
                String type = (String) getModel().getValueAt(modelRow, 0);
                if (type.equals("Sell")) {
                comp.setFont(new Font(attributes));
                comp.setForeground(Color.red);
                } else {
                comp.setFont(new Font("Serif", Font.BOLD, 12));
                }
                } else {
                comp.setFont(table.getFont());
                }
                jc.setBorder(BorderFactory.createCompoundBorder(jc.getBorder(), BorderFactory.createEmptyBorder(0, 0, 0, 5)));
                return comp;*/
            }
        };
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane = new JScrollPane(table);
        getContentPane().add(scrollPane);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                TablePrepareRenderer frame = new TablePrepareRenderer();
                frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }
}