A Table with Row Headers

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

public class RowHeaderTable extends JFrame {

public RowHeaderTable( ) {
super(”Row Header Test”);
setSize(300, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);

TableModel tm = new AbstractTableModel( ) {
String data[] = {”", “a”, “b”, “c”, “d”, “e”};
String headers[] = {”Row #”, “Column 1″, “Column 2″, “Column 3″,
“Column 4″, “Column 5″};
public int getColumnCount( ) { return data.length; }
public int getRowCount( ) { return 1000; }
public String getColumnName(int col) { return headers[col]; }

// Synthesize some entries using the data values and the row number.
public Object getValueAt(int row, int col) {
return data[col] + row;
}
};

// Create a column model for the main table. This model ignores the first
// column added and sets a minimum width of 150 pixels for all others.
TableColumnModel cm = new DefaultTableColumnModel( ) {
boolean first = true;
public void addColumn(TableColumn tc) {
// Drop the first column, which will be the row header.
if (first) { first = false; return; }
tc.setMinWidth(150); // Just for looks, really…
super.addColumn(tc);
}
};

// Create a column model that will serve as our row header table. This model
// picks a maximum width and stores only the first column.
TableColumnModel rowHeaderModel = new DefaultTableColumnModel( ) {
boolean first = true;
public void addColumn(TableColumn tc) {
if (first) {
tc.setMaxWidth(tc.getPreferredWidth( ));
super.addColumn(tc);
first = false;
}
// Drop the rest of the columns; this is the header column only.
}
};

JTable jt = new JTable(tm, cm);

// Set up the header column and hook it up to everything.
JTable headerColumn = new JTable(tm, rowHeaderModel);
jt.createDefaultColumnsFromModel( );
headerColumn.createDefaultColumnsFromModel( );

// Make sure that selections between the main table and the header stay in sync
// (by sharing the same model).
jt.setSelectionModel(headerColumn.getSelectionModel( ));

// Make the header column look pretty.
// headerColumn.setBorder(BorderFactory.createEtchedBorder( ));
headerColumn.setBackground(Color.lightGray);
headerColumn.setColumnSelectionAllowed(false);
headerColumn.setCellSelectionEnabled(false);

// Put it in a viewport that we can control.
JViewport jv = new JViewport( );
jv.setView(headerColumn);
jv.setPreferredSize(headerColumn.getMaximumSize( ));

// Without shutting off autoResizeMode, our tables won’t scroll correctly
// (horizontally, anyway).
jt.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

// We have to manually attach the row headers, but after that, the scroll
// pane keeps them in sync.
JScrollPane jsp = new JScrollPane(jt);
jsp.setRowHeader(jv);
jsp.setCorner(ScrollPaneConstants.UPPER_LEFT_CORNER,
headerColumn.getTableHeader( ));
getContentPane( ).add(jsp, BorderLayout.CENTER);
}

public static void main(String args[]) {
RowHeaderTable rht = new RowHeaderTable( );
rht.setVisible(true);
}
}

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