how to highlight multiple cells in jtable

Question

I have to search text in jtable data. e.g. "ADMIN" text is appearing multiple places in jtable then how to highlight all the cells that contains specified value.

Does anyone have any idea ?

Answer 1

In SwingX (biased me can't resist showing off :-) the solution boils down to installing a Highlighter and configure it with a SearchPredicate as needed:

// instantiate a background decorator
final ColorHighlighter hl = new ColorHighlighter(HighlightPredicate.NEVER, Color.YELLOW, null);
// register it with the table (of type JXTable)
table.addHighlighter(hl);
// set the predicate, f.i. highlight all cell that contain ADMIN
hl.setHighlightPredicate(new SearchPredicate("ADMIN"));

Answer 2

As @kleopatra suggested, use a custom CellRenderer (the following example is just a POC, add methods to change the search pattern, highlight color, etc.):

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

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;

public class CellHighlighter {

    private static class CellHighlighterRenderer extends JLabel implements TableCellRenderer {

        public CellHighlighterRenderer() {
            setOpaque(true); // Or color won't be displayed!
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            String val = (String)value;
            Color c;
            if (val.matches(".*MIN.*")) // Add a method to configure the regexpr
                c = Color.YELLOW; // Add a method to configure color
            else
                c = UIManager.getColor("Table.background");
            setBackground(c);
            setText(val);
            return this;
        }
    }

    public static void main(String[] args) {
        String[] columnNames = {
            "Login", "Real name", "Age", "Birthday"
        };
        String[][] data = {
            {"toto", "Toto Mackwert", "73", "18/06/1940"},
            {"adm", "ADMINISTRATOR", "13", "01/01/2000"},
            {"AMINA", "Amina Farou", "3", "01/01/2010"},
        };
        JTable table = new JTable(data, columnNames);
        table.setDefaultRenderer(Object.class, new CellHighlighterRenderer());
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane = new JScrollPane(table);
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(scrollPane);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

}