Dear all,

i am having a JTable, in which a column of each row is having a checkbox field.


If the checkbox is checked then and then i should be able to modify the cells in that row, ...where the checkbox is.

I have created the table with AbstractTableModel of which the isCellEditable(int row, int col) method is overridden.

Whatever return value (true/false) gives, it reflects the perticular
cells becomes editable/non-editable respectively.


but at run time...(mean the table is created now) and now i want to make the cells editable/non-editable depending on the checkbox value...


how can i implement it.........
please suggest.........

thank you.........


following is the sample code from some tutorial...

/*
 * TableRenderDemo.java requires no other files.
 */

import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;

import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

/**
 * TableRenderDemo is just like TableDemo, except that it explicitly initializes
 * column sizes and it uses a combo box as an editor for the Sport column.
 */
@SuppressWarnings("serial")
public class TableRenderDemo extends JPanel {
    private boolean DEBUG = true;

    public TableRenderDemo() {
        super(new GridLayout(1, 0));

        JTable table = new JTable(new MyTableModel());

        // table.setEditingColumn(0);
        // table.editCellAt(0, 0);

        table.setPreferredScrollableViewportSize(new Dimension(500, 100));

        // Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        // Set up column sizes.
        initColumnSizes(table);

        // Fiddle with the Sport column's cell editors/renderers.
        setUpSportColumn(table, table.getColumnModel().getColumn(2));

        // Add the scroll pane to this panel.
        add(scrollPane);
    }

    /*
     * This method picks good column sizes. If all column heads are wider than
     * the column's cells' contents, then you can just use
     * column.sizeWidthToFit().
     */
    private void initColumnSizes(JTable table) {
        MyTableModel model = (MyTableModel) table.getModel();
        TableColumn column = null;
        Component comp = null;
        int headerWidth = 0;
        int cellWidth = 0;
        Object[] longValues = model.longValues;
        TableCellRenderer headerRenderer = table.getTableHeader()
                .getDefaultRenderer();

        for (int i = 0; i < 5; i++) {
            column = table.getColumnModel().getColumn(i);

            comp = headerRenderer.getTableCellRendererComponent(null, column
                    .getHeaderValue(), false, false, 0, 0);
            headerWidth = comp.getPreferredSize().width;

            comp = table.getDefaultRenderer(model.getColumnClass(i))
                    .getTableCellRendererComponent(table, longValues[i], false,
                            false, 0, i);

            cellWidth = comp.getPreferredSize().width;

            if (DEBUG) {
                System.out.println("Initializing width of column " + i + ". "
                        + "headerWidth = " + headerWidth + "; cellWidth = "
                        + cellWidth);
            }

            // XXX: Before Swing 1.1 Beta 2, use setMinWidth instead.
            column.setPreferredWidth(Math.max(headerWidth, cellWidth));
        }
    }

    public void setUpSportColumn(JTable table, TableColumn sportColumn) {
        // Set up the editor for the sport cells.
        JComboBox comboBox = new JComboBox();
        comboBox.addItem("Snowboarding");
        comboBox.addItem("Rowing");
        comboBox.addItem("Knitting");
        comboBox.addItem("Speed reading");
        comboBox.addItem("Pool");
        comboBox.addItem("None of the above");
        sportColumn.setCellEditor(new DefaultCellEditor(comboBox));

        // Set up tool tips for the sport cells.
        DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
        renderer.setToolTipText("Click for combo box");
        sportColumn.setCellRenderer(renderer);
    }

    class MyTableModel extends AbstractTableModel {
        private String[] columnNames = { "First Name", "Last Name", "Sport",
                "# of Years", "Vegetarian" };

        private Object[][] data = {
                { "Mary", "Campione", "Snowboarding", new Integer(5),
                        new Boolean(false) },
                { "Alison", "Huml", "Rowing", new Integer(3), new Boolean(true) },
                { "Kathy", "Walrath", "Knitting", new Integer(2),
                        new Boolean(false) },
                { "Sharon", "Zakhour", "Speed reading", new Integer(20),
                        new Boolean(true) },
                { "Philip", "Milne", "Pool", new Integer(10),
                        new Boolean(false) } };

        public final Object[] longValues = { "Sharon", "Campione",
                "None of the above", new Integer(20), Boolean.TRUE };

        public int getColumnCount() {
            return columnNames.length;
        }

        public int getRowCount() {
            return data.length;
        }

        public String getColumnName(int col) {
            return columnNames[col];
        }

        public Object getValueAt(int row, int col) {
            return data[row][col];
        }

        /*
         * JTable uses this method to determine the default renderer/ editor for
         * each cell. If we didn't implement this method, then the last column
         * would contain text ("true"/"false"), rather than a check box.
         */
        public Class<?> getColumnClass(int c) {
            return getValueAt(0, c).getClass();
        }

        /*
         * Don't need to implement this method unless your table's editable.
         */
        public boolean isCellEditable(int row, int col) {
            // Note that the data/cell address is constant,
            // no matter where the cell appears onscreen.
            // return false;
            return true;

        }

        /*
         * Don't need to implement this method unless your table's data can
         * change.
         */
        public void setValueAt(Object value, int row, int col) {
            if (DEBUG) {
                System.out.println("Setting value at " + row + "," + col
                        + " to " + value + " (an instance of "
                        + value.getClass() + ")");
            }

            data[row][col] = value;
            fireTableCellUpdated(row, col);

            if (DEBUG) {
                System.out.println("New value of data:");
                printDebugData();
            }
        }

        private void printDebugData() {
            int numRows = getRowCount();
            int numCols = getColumnCount();

            for (int i = 0; i < numRows; i++) {
                System.out.print("    row " + i + ":");
                for (int j = 0; j < numCols; j++) {
                    System.out.print("  " + data[i][j]);
                }
                System.out.println();
            }
            System.out.println("--------------------------");
        }
    }

    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event-dispatching thread.
     */
    private static void createAndShowGUI() {
        // Create and set up the window.
        JFrame frame = new JFrame("TableRenderDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create and set up the content pane.
        TableRenderDemo newContentPane = new TableRenderDemo();
        newContentPane.setOpaque(true); // content panes must be opaque
        frame.setContentPane(newContentPane);

        // Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        // Schedule a job for the event-dispatching thread:
        // creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

Use actionListener on checkbox to see if any changes happends, if yes than change status from non-editable to editable and oposite

thank you for reply.........

means r u saying that..... i should change some property of table on the event of any action performed......??

that is okay.... on that event what property should i change....???


thanks for spending your precious time....

plz reply...


Use actionListener on checkbox to see if any changes happends, if yes than change status from non-editable to editable and oposite

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