使用自定义呈现突出显示JTable中的行选择

Question

I am creating JTable with custom table cell renderer by extending DefaultTableCellRenderer where I would like to use some image along with the text.

As you can see above, even though I have selected the particular row, it is not highlighting in the Testcases column. I have tried some existing SO questions ( Q1 , Q2 ) solutions, but still it is not working. Where I am making the mistake ?

JTableTest.java

import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class JTableTest extends JFrame {

    public DefaultTableModel testcaseModel;
    public JTable testcasesTable;
    Object[] testcaseTableColumns = {"S.No", "Testcases"};
    public static final int TESTCASE_SNO_COLUMN = 0;
    public static final int TESTCASE_NAME_COLUMN = 1;

    public JTableTest() {
        initComponents();
    }

    private void initComponents() {
        if (testcaseModel == null) {
            testcaseModel = new DefaultTableModel(null, testcaseTableColumns){

                @Override
                public Class<?> getColumnClass(int columnIndex) {
//                    if (columnIndex == -1) {
//                        return Integer.class;
//                    } else if(columnIndex==1){
//                        return JLabel.class;
//                    }
                    return Object.class;
                }

            };
        }
        if (testcasesTable == null) {
            testcasesTable = new JTable(testcaseModel) {
                @Override
                public boolean isCellEditable(int row, int column) {
                    return false;
                }
            };
        }
        testcasesTable.setCellSelectionEnabled(true);
        testcasesTable.getColumnModel().getColumn(TESTCASE_NAME_COLUMN).setCellRenderer(new LabelRenderer());
        for (int i = 0; i < 10; i++) {
            testcaseModel.addRow(new Object[]{i, (i * 100)});
        }
    }

    public static void main(String[] args) {
        JTableTest jTableTest = new JTableTest();
        jTableTest.setSize(300, 300);
        jTableTest.setTitle("TableIcon");
        jTableTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel pnlMain = new JPanel(new BorderLayout(10, 10));
        JScrollPane scrollPane = new JScrollPane(jTableTest.testcasesTable);
        pnlMain.add(scrollPane);
        jTableTest.getContentPane().add(pnlMain);
        jTableTest.setVisible(true);

    }

}

LabelRenderer.java

import java.awt.Component;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.table.DefaultTableCellRenderer;


public class LabelRenderer extends DefaultTableCellRenderer {

    public static final Border focusedCellBorder = UIManager.getBorder("Table.focusCellHighlightBorder");

    public static final Border unfocusedCellBorder = createEmptyBorder();

    private static Border createEmptyBorder() {
        Insets i = focusedCellBorder.getBorderInsets(new JLabel());
        return BorderFactory.createEmptyBorder(i.top, i.left, i.bottom, i.right);
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        String text = value.toString();
        JLabel label = new JLabel(text);

        try {
            label.setIcon(new ImageIcon(getClass().getResource("ok_16px.png")));
            // This below code setting the border to be highlighted, but not whole              
            label.setBorder(hasFocus ? focusedCellBorder : unfocusedCellBorder);

        } catch (Exception ex) {
            System.out.println(ex);
        }
       // This also not working.....    
        if (isSelected) {
            label.setBackground(table.getSelectionBackground());
            label.setForeground(table.getSelectionForeground());
        } else {
            label.setBackground(table.getBackground());
            label.setForeground(table.getForeground());
        }
        return label;
    }
}

Answer 1

Don't create another JLabel in the TableCellEditor , DefaultTableCellEditor extends from JLabel already, you just to apply the settings you need, leave the DefaultTableCellRenderer to take care of the rest

public class LabelRenderer extends DefaultTableCellRenderer {

    public static final Border focusedCellBorder = UIManager.getBorder("Table.focusCellHighlightBorder");

    public static final Border unfocusedCellBorder = createEmptyBorder();

    private static Border createEmptyBorder() {
        Insets i = focusedCellBorder.getBorderInsets(new JLabel());
        return BorderFactory.createEmptyBorder(i.top, i.left, i.bottom, i.right);
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        String text = value.toString();

        try {
            setIcon(new ImageIcon(getClass().getResource("ok_16px.png")));
            // This below code setting the border to be highlighted, but not whole              

        } catch (Exception ex) {
            System.out.println(ex);
        }
        setBorder(hasFocus ? focusedCellBorder : unfocusedCellBorder);

        return this;
    }
}

Also, note, that with cellSelection enabled, you will need to click a cell in the second column to see the highlighting. Turn it off to allow for full row selection