Name: mc57594 Date: 08/12/99


-------- user's description ---------------------------------

When you drag a JTable column onto or across a selected column
the column being dragged steals the selection.

The following program can reproduce it. When it starts the first
column will be selected. Drag any other column to the first
column. When it touches the first column it will become selected
and remain selected no matter where you drop it.

FYI, "java -version" prints:

Classic VM (build JDK-1.2.1-A, native threads)

----- cut here -----
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;

public class SimpleTableSelectionDemo extends JFrame {
    private boolean DEBUG = false;
    private boolean ALLOW_COLUMN_SELECTION = true;
    private boolean ALLOW_ROW_SELECTION = false;

    public SimpleTableSelectionDemo() {
        super("SimpleTableSelectionDemo");

        Object[][] data = {
            {"Mary", "Campione",
             "Snowboarding", new Integer(5), new Boolean(false)},
            {"Alison", "Huml",
             "Rowing", new Integer(3), new Boolean(true)},
            {"Kathy", "Walrath",
             "Chasing toddlers", new Integer(2), new Boolean(false)},
            {"Mark", "Andrews",
             "Speed reading", new Integer(20), new Boolean(true)},
            {"Angela", "Lih",
             "Teaching high school", new Integer(4), new Boolean(false)}
        };

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

        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) {
                    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) {
                    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 window.
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    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("--------------------------");
    }

    public static void main(String[] args) {
        SimpleTableSelectionDemo frame = new SimpleTableSelectionDemo();
        frame.pack();
        frame.setVisible(true);
    }
}
(Review ID: 93416)
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