Re: Drawing columns headers of a JTable

From:

Chanchal <chanchal.jacob@gmail.com>

Newsgroups:

comp.lang.java.gui

Date:

Wed, 6 Aug 2008 03:45:04 -0700 (PDT)

Message-ID:

<cfe0d156-c929-4103-8a1a-b454057cc5b0@z6g2000pre.googlegroups.com>

With some workaroung i have producted *somewhat* the expected output.
The code is

<sscce>

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

public class FixedRowExample_2 extends JFrame {
    Object[][] data;
    Object[][] fixedData;
    Object[] column;
    JTable fixedTable,table;
    private int FIXED_NUM = 2;
    private JScrollPane scroll;
    private JScrollPane fixedScroll;
    public FixedRowExample_2() {
        super( "Fixed Row Example" );

        data = new Object[][]{
            { "a","","","","",""},
            { "","b","","","",""},
            { "","","c","","",""},
            { "","","","d","",""},
            { "","","","","e",""},
            { "","","","","","f"}};
        fixedData = new Object[][]{ {"fixed1","","","","","","",""},
        {"fixed2","","","","","","",""}};
        column = new Object[]{"A","B","C","D","E","F"};

        AbstractTableModel model = new AbstractTableModel() {
            public int getColumnCount() { return column.length; }
            public int getRowCount() { return data.length -
FIXED_NUM; }
            public String getColumnName(int col) {
                return (String)column[col];
            }
            public Object getValueAt(int row, int col) {
                return data[row][col];
            }
            public void setValueAt(Object obj, int row, int col) {
                data[row][col] = obj;
            }
            public boolean CellEditable(int row, int col) {
                return true;
            }
        };

        AbstractTableModel fixedModel = new AbstractTableModel() {
            public int getColumnCount() { return column.length; }
            public int getRowCount() { return FIXED_NUM; }
            public Object getValueAt(int row, int col) {
                return fixedData[row][col];
            }
        };

        table = new JTable( model ) {
            protected JTableHeader createDefaultTableHeader()
{
                return null;
            }
        };

        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        fixedTable = new JTable( fixedModel );
        fixedTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

fixedTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        scroll = new JScrollPane( table );

        fixedScroll = new JScrollPane( fixedTable ) {
            public void setColumnHeaderView(Component view) {} // work
around
        }; //

fixedScroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

fixedScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

        JScrollBar bar = fixedScroll.getVerticalScrollBar();
        final JScrollBar dummyBar = new JScrollBar() {
            public void paint(Graphics g) {}
        };
        dummyBar.setVisible(false);
        fixedScroll.setVerticalScrollBar(dummyBar);

fixedScroll.setBorder(javax.swing.BorderFactory.createEmptyBorder(1,
1, 1, 1));

        JScrollBar dummyBar2 = new JScrollBar() {
            public void paint(Graphics g) {
                super.paint(g);
            }
        };
        dummyBar2.setPreferredSize(bar.getPreferredSize());
        dummyBar.setPreferredSize(dummyBar2.getPreferredSize());
        scroll.setVerticalScrollBar(dummyBar2);

scroll.setBorder(javax.swing.BorderFactory.createEmptyBorder(1, 1, 1,
1));

        final JScrollBar bar1 = fixedScroll.getHorizontalScrollBar();
        JScrollBar bar2 = scroll.getHorizontalScrollBar();
        bar2.addAdjustmentListener(new AdjustmentListener() {
            public void adjustmentValueChanged(AdjustmentEvent e) {
                bar1.setValue(e.getValue());
            }
        });

        scroll.setPreferredSize(new Dimension(400, 100));

        fixedScroll.setPreferredSize(new Dimension(400,
fixedTable.getRowHeight() * 2)); // Hmm...
        getContentPane().add( scroll, BorderLayout.CENTER);
        getContentPane().add(fixedScroll, BorderLayout.NORTH);
    }

    public static void main(String[] args) {
        FixedRowExample_2 frame = new FixedRowExample_2();
        frame.addWindowListener( new WindowAdapter() {
            public void windowClosing( WindowEvent e ) {
                System.exit(0);
            }
        });
        frame.pack();
        frame.setVisible(true);
    }
}
</sscce>

however when the frame is displayed a portion on the upper-right
corner is being displaed in gray. See here
http://picasaweb.google.com/chanchal.jacob/Java/photo#5231350524043373778

Also when mouse is moved on that area, a scollbar is displayed there.
http://picasaweb.google.com/chanchal.jacob/Java/photo#5231350531772014066

Any suggestions on how this can be solved/

Thanks and Regards

Chanchal