A row header column with the TableColumnModel
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// RowHeaderTable.java
//A simple application that demonstrates the use of the TableColumnModel
//class to build a row header column that scrolls with the regular data
//rows.
//
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.ScrollPaneConstants;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableModel;
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 & the row #
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 . . . that'll 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 only stores 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 get it hooked 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 a bit
JViewport jv = new JViewport();
jv.setView(headerColumn);
jv.setPreferredSize(headerColumn.getMaximumSize());
// With out 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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