How to provide pagination support to a JTable in Swing?

Question

I have created one GUI in Swing Java in which I have used JTable.Now I want to display next page information into it by using pagination. How should I do that ?

Answer 1

Another option to implement this is to use a scrollbar-less scrollpane and a couple nav buttons to effect the control. The buttons that have been added are normal JButtons for the prototype.

A quick prototype is added below. It makes a couple assumptions, one of which is that the table model has all of its data. Work could be done to ensure that rows end up flush at the top of the view upon navigation.

private void buildFrame() {
    frame = new JFrame("Demo");
    frame.setSize(300, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    addStuffToFrame();
    frame.setVisible(true);

}

private void addStuffToFrame() {
    final JTable table = getTable();
    final JScrollPane scrollPane = new JScrollPane(table);
    scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
    final JButton next = new JButton("next");
    final JButton prev = new JButton("prev");

    ActionListener al = new ActionListener(){
        public void actionPerformed(ActionEvent e) {
            Rectangle rect = scrollPane.getVisibleRect();
            JScrollBar  bar = scrollPane.getVerticalScrollBar();
            int blockIncr = scrollPane.getViewport().getViewRect().height;
            if (e.getSource() == next) {
                bar.setValue(bar.getValue() + blockIncr);
            } else if (e.getSource() == prev) {
                bar.setValue(bar.getValue() - blockIncr);
            }
            scrollPane.scrollRectToVisible(rect);
        }
    };

    next.addActionListener(al);
    prev.addActionListener(al);

    JPanel panel = new JPanel(new BorderLayout());
    JPanel buttonPanel = new JPanel();
    buttonPanel.add(prev);
    buttonPanel.add(next);
    panel.add(buttonPanel, BorderLayout.NORTH);
    panel.add(scrollPane, BorderLayout.CENTER);
    frame.getContentPane().add(panel);
}

private JTable getTable() {
    String[] colNames = new String[]{
            "col 0", "col 1", "col 2", "col 3"
    };

    String[][] data = new String[100][4];
    for (int i = 0; i < 100; i++) {
        for (int j = 0; j < 4; j++) {
            data[i][j] = "r:" + i + " c:" + j;
        }
    }

    return new JTable(data,colNames);

}

alt text http://img7.imageshack.us/img7/4205/picture4qv.png