Re: JTable, JScrollPane and empty space

In article <IdydnSRiIqV1LpHSnZ2dnUVZ_v2dnZ2d@megapath.net>,
 "A. W. Dunstan" <no@spam.thanks> wrote:


One approach is to use BoxLayout: use setPreferredScrollableViewportSize
as desired and restrict the maximum size of the smaller table's scroll
pane.

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

public class TablePanel extends JPanel {

    public static final int WIDE = 300;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame f = new JFrame("TablePanel");
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(new TablePanel());
                f.pack();
                f.setVisible(true);
            }
        });
    }

    public TablePanel() {
        this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

        JTable tableA = new JTable(new MyModel("A", 12));
        int h = tableA.getPreferredSize().height;
        tableA.setPreferredScrollableViewportSize(
            new Dimension(WIDE, h));
        JScrollPane jspA = new JScrollPane(tableA);
        jspA.setVerticalScrollBarPolicy(
            JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        jspA.setMaximumSize(new Dimension(Short.MAX_VALUE, h));
        this.add(jspA);

        JTable tableB = new JTable(new MyModel("B", 32));
        h = tableB.getPreferredSize().height;
        tableB.setPreferredScrollableViewportSize(
            new Dimension(WIDE, h / 2));
        final JScrollPane jspB = new JScrollPane(tableB);
        jspB.setVerticalScrollBarPolicy(
            JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        this.add(jspB);
    }

    private static class MyModel extends AbstractTableModel {

        private final String name;
        private final int rows;

        public MyModel(String name, int rows) {
            this.name = name;
            this.rows = rows;
        }

        @Override
        public int getRowCount() {
            return rows;
        }

        @Override
        public int getColumnCount() {
            return 2;
        }

        @Override
        public String getColumnName(int col) {
            return name + (col + 1);
        }

        @Override
        public Object getValueAt(int row, int col) {
            return (row + 1) / 10.0;
        }

        @Override
        public Class<?> getColumnClass(int col) {
            return Number.class;
        }
    }
}

--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>