simpletableselectiondemo.java

SelectionDemo also has code (not included in the preceding snippet) that changes the table s selecti

/*
 * SimpleTableSelectionDemo.java is a 1.4 application that requires no other files.
 */

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JComponent;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

/** 
 * SimpleTableSelectionDemo is just like SimpleTableDemo, 
 * except that it detects selections, printing information
 * about the current selection to standard output.
 */
public class SimpleTableSelectionDemo extends JPanel {
    private boolean DEBUG = false;
    private boolean ALLOW_COLUMN_SELECTION = false;
    private boolean ALLOW_ROW_SELECTION = true;

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

        final String[] columnNames = {"First Name",
                                      "Last Name",
                                      "Sport",
                                      "# of Years",
                                      "Vegetarian"};

        final 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)}
        };

        final JTable table = new JTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));

        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        if (ALLOW_ROW_SELECTION) { // true by default
            ListSelectionModel rowSM = table.getSelectionModel();
            rowSM.addListSelectionListener(new ListSelectionListener() {
                public void valueChanged(ListSelectionEvent e) {
                    //Ignore extra messages.
                    if (e.getValueIsAdjusting()) return;

                    ListSelectionModel lsm = (ListSelectionModel)e.getSource();
                    if (lsm.isSelectionEmpty()) {
                        System.out.println("No rows are selected.");
                    } else {
                        int selectedRow = lsm.getMinSelectionIndex();
                        System.out.println("Row " + selectedRow
                                           + " is now selected.");
                    }
                }
            });
        } else {
            table.setRowSelectionAllowed(false);
        }

        if (ALLOW_COLUMN_SELECTION) { // false by default
            if (ALLOW_ROW_SELECTION) {
                //We allow both row and column selection, which
                //implies that we *really* want to allow individual
                //cell selection.
                table.setCellSelectionEnabled(true);
            }
            table.setColumnSelectionAllowed(true);
            ListSelectionModel colSM =
                table.getColumnModel().getSelectionModel();
            colSM.addListSelectionListener(new ListSelectionListener() {
                public void valueChanged(ListSelectionEvent e) {
                    //Ignore extra messages.
                    if (e.getValueIsAdjusting()) return;

                    ListSelectionModel lsm = (ListSelectionModel)e.getSource();
                    if (lsm.isSelectionEmpty()) {
                        System.out.println("No columns are selected.");
                    } else {
                        int selectedCol = lsm.getMinSelectionIndex();
                        System.out.println("Column " + selectedCol
                                           + " is now selected.");
                    }
                }
            });
        }

        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
                }
            });
        }

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

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

    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();

        System.out.println("Value of data: ");
        for (int i=0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j=0; j < numCols; j++) {
                System.out.print("  " + model.getValueAt(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() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("SimpleTableSelectionDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        SimpleTableSelectionDemo newContentPane = new SimpleTableSelectionDemo();
        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();
            }
        });
    }
}