1 
  2 package com.vizitsolutions.identitytable;
  3 
  4 import javax.swing.table.DefaultTableColumnModel;
  5 import javax.swing.JScrollPane;
  6 import javax.swing.JTable;
  7 import javax.swing.table.TableColumn;
  8 import javax.swing.table.TableColumnModel;
  9 
 10 /**
 11  * <p>$Id$</p>
 12  *
 13  * <p>
 14  * This class maps a TableModel into two JTables, and places
 15  * them into a JScrollPane. The first JTable contains n fixed
 16  * columns, and represents what is commonly called a rowheader.
 17  * This is placed in the rowheader area of the JScrollPane. These
 18  * columns will not scroll horizontally. This is particularly
 19  * useful when you have one or more columns that identify an object
 20  * and several additional columns that contain attributes of the
 21  * object. Placing the identifying columns in these fixed columns
 22  * ensures that they are always visible while the attributes of the
 23  * object are scrolled into view.
 24  * </p>
 25  * <p>
 26  * The second JTable contains the remaining columns and is placed in
 27  * the main viewport and will scroll normally.
 28  * </p>
 29  *
 30  * @author Alex Kluge
 31  * @version $Revision$, $Date$
 32  */
 33 public class IdentityTable2 extends JScrollPane
 34 {
 35     private JTable           mainTable;
 36     private TableColumnModel mainColumnModel      = new DefaultTableColumnModel();
 37     private JTable           rowHeaderTable;
 38     private TableColumnModel rowHeaderColumnModel = new DefaultTableColumnModel();
 39     
 40     /**
 41      * Creates a new instance of IdentityTable1
 42      */
 43     public IdentityTable2(IdentityTableModel baseTableModel)
 44     {
 45         // Start out life as an empty scrollpane.
 46         super();
 47         
 48         // Loop over each of the fixed columns, and create columns in the row
 49         // header column model for them.
 50         TableColumn column;
 51         int         columnCount         = baseTableModel.getColumnCount();
 52         int         currentColumn;
 53         int         identityColumnCount = baseTableModel.getIdentityColumnCount();
 54         
 55         for (currentColumn = 0; currentColumn<identityColumnCount; currentColumn++)
 56         {
 57             column = new TableColumn(currentColumn);
 58             column.setHeaderValue(baseTableModel.getColumnName(currentColumn));
 59             
 60             rowHeaderColumnModel.addColumn(column);
 61         }
 62         
 63         // Now loop over the remaining columns, and add them to the main table's column model.
 64         for (currentColumn = identityColumnCount; currentColumn<columnCount; currentColumn++)
 65         {
 66             column = new TableColumn(currentColumn);
 67             column.setHeaderValue(baseTableModel.getColumnName(currentColumn));
 68             
 69             mainColumnModel.addColumn(column);
 70         }
 71         
 72         // Providing a column model here automatically sets the
 73         // autoCreateColumnsFromModel flag to false.
 74         rowHeaderTable = new JTable(baseTableModel, rowHeaderColumnModel);
 75         rowHeaderTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
 76 
 77         mainTable      = new JTable(baseTableModel, mainColumnModel);
 78         mainTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
 79         
 80         // Ensure that both tables have common selections.
 81         rowHeaderTable.setSelectionModel(mainTable.getSelectionModel());
 82         rowHeaderTable.setPreferredScrollableViewportSize(rowHeaderTable.getPreferredSize());
 83         
 84         // This puts the column headers in the upper left corner above the row
 85         // header columns. This is the same thing that happens when a JTable configures
 86         // the containing JScrollPane.
 87         setCorner(JScrollPane.UPPER_LEFT_CORNER, rowHeaderTable.getTableHeader());
 88 
 89         
 90         setViewportView(mainTable);
 91         setRowHeaderView(rowHeaderTable);
 92     }
 93     
 94     public TableColumnModel getMainColumnModel()
 95     {
 96         return mainColumnModel;
 97     }
 98     
 99     public TableColumnModel getRowHeaderColumnModel()
100     {
101         return rowHeaderColumnModel;
102     }
103 }
104 
105