Source Code : ComboBox Table

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ComboBox Table

 
/*
Core SWING Advanced Programming 
By Kim Topley
ISBN: 0 13 083292 8       
Publisher: Prentice Hall  
*/



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

public class ComboBoxTable {
  public static void main(String[] args) {
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    } catch (Exception evt) {}
  
    JFrame f = new JFrame("Combo Box Table");
    JTable tbl = new JTable(new ComboBoxTableModel());
    
    // Create the combo box editor
    JComboBox comboBox = new JComboBox(ComboBoxTableModel.getValidStates());
    comboBox.setEditable(true);
    DefaultCellEditor editor = new DefaultCellEditor(comboBox);

    // Assign the editor to the second column
    TableColumnModel tcm = tbl.getColumnModel();
    tcm.getColumn(1).setCellEditor(editor);

    // Set column widths
    tcm.getColumn(0).setPreferredWidth(200);
    tcm.getColumn(1).setPreferredWidth(100);

    // Set row heighht
    tbl.setRowHeight(20);

    tbl.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    tbl.setPreferredScrollableViewportSize(tbl.getPreferredSize());  

    f.getContentPane().add(new JScrollPane(tbl), "Center");
    f.pack();
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent evt) {
        System.exit(0);
      }
    });
    f.setVisible(true);
  }
}

class ComboBoxTableModel extends AbstractTableModel {
  // Implementation of TableModel interface 
  public int getRowCount() {
    return data.length;
  }

  public int getColumnCount() {
    return COLUMN_COUNT;
  }

  public Object getValueAt(int row, int column) {
    return data[row][column];
  }

  public Class getColumnClass(int column) {
    return (data[0][column]).getClass();
  }

  public String getColumnName(int column) {
    return columnNames[column];
  }

  public boolean isCellEditable(int row, int column) {
    return column == 1;
  }

  public void setValueAt(Object value, int row, int column) {
    if (isValidValue(value)) {
      data[row][column] = value;
      fireTableRowsUpdated(row, row);
    }
  }

  // Extra public methods
  public static String[] getValidStates() {
    return validStates;
  }

  // Protected methods
  protected boolean isValidValue(Object value) {
    if (value instanceof String) {
      String sValue = (String)value;

      for (int i = 0; i < validStates.length; i++) {
        if (sValue.equals(validStates[i])) {
          return true;
        }
      }
    }

    return false;
  }

  protected static final int COLUMN_COUNT = 2;
    
  protected static final String[] validStates = { 
    "On order", "In stock", "Out of print"
  };

  protected Object[][] data = new Object[][] {
    { "Core Java Volume 1", validStates[0] },
    { "Core Java Volume 2", validStates[0] },
    { "Core Web Programming", validStates[0] },
    { "Core Visual Basic 5", validStates[0] },
    { "Core Java Foundation Classes", validStates[0] }
  };
  
  protected static final String[] columnNames = {
    "Book Name", "Status"
  };

}

           
         
  

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