JTable row selection from the end

Question

Happy New Year for everyone! :)

I have a JTable inside JScrollPane (fillsViewportHeight is true) and want to enable row selection from the end when drag starts outside the table (as shown on the pic)

SSCCE:

public class SimpleTableDemo extends JPanel {

    public SimpleTableDemo() {
        super(new BorderLayout(0, 0));

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

        Object[][] data = { { "Kathy", "Smith", "Snowboarding", new Integer(5), new Boolean(false) }, { "John", "Doe", "Rowing", new Integer(3), new Boolean(true) }, { "Sue", "Black", "Knitting", new Integer(2), new Boolean(false) }, { "Jane", "White", "Speed reading", new Integer(20), new Boolean(true) }, { "Joe", "Brown", "Pool", new Integer(10), new Boolean(false) } };

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

        JScrollPane scrollPane = new JScrollPane(table);

        add(scrollPane, BorderLayout.CENTER);
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(700, 400);

        SimpleTableDemo newContentPane = new SimpleTableDemo();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);

        frame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

How can I do that?

UPD:

The default behavior of JTable is to select all rows from start to current one, if I start selection lower the last row. I want to select only that rows which was under the mouse while I've dragged the mouse up (as I've shown in picture).

Answer 1

Ingredients:

• a mouseListener detecting the mousePressed "below" the last row
• if so, set the anchor of the row selection model to the last row

Something like:

MouseListener l = new MouseAdapter() {

    @Override
    public void mousePressed(MouseEvent e) {
        Rectangle lastRow = table.getCellRect(table.getRowCount() - 1, 0, false);
        if (e.getY() < lastRow.y + lastRow.height) return;
        System.out.println(table);
        table.getSelectionModel().setAnchorSelectionIndex(table.getRowCount()-1);
    }

};
table.addMouseListener(l);