package com.opensymphony.workflow.designer.swing;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.File;import javax.swing.*;import javax.swing.event.EventListenerList;import com.opensymphony.workflow.designer.Utils;public class FileField extends JPanel{  private final JTextField field = new JTextField();  private final FixedButton button = new FixedButton(field);  private String suffix;  private String description;  private final int type;  private boolean isSave;  private boolean buttonEnabled;  private File file;  protected EventListenerList listenerList = new EventListenerList();  /**   * Only one <code>ActionEvent</code> is needed per field instance since the event's only state is the source property.   * The source of events generated is always "this".   */  protected transient ActionEvent actionEvent;  public void actionPerformed(ActionEvent e)  {  }  public FileField(int type, boolean save, String suffix, String description)  {    super(new BorderLayout());    this.type = type;    this.isSave = save;    this.suffix = suffix;    this.description = description;    buttonEnabled = true;    add(field, BorderLayout.CENTER);    add(button, BorderLayout.EAST);    button.addActionListener(new ActionListener()    {      public void actionPerformed(ActionEvent e)      {        File file = Utils.promptUserForFile(FileField.this, FileField.this.type, FileField.this.isSave,                                            FileField.this.suffix, FileField.this.description);        if(file != null)        {          field.setText(file.getAbsolutePath());          FileField.this.file = file;          fireStateChanged();        }      }    });  }  /**   * Adds an <code>ActionListener</code> to the field.   *   * @param l the <code>ActionListener</code> to be added   */  public void addActionListener(ActionListener l)  {    listenerList.add(ActionListener.class, l);  }  /**   * Notifies all listeners that have registered interest for   * notification on this event type.  The event instance   * is lazily created.   *   * @see EventListenerList   */  protected void fireStateChanged()  {    // Guaranteed to return a non-null array    Object[] listeners = listenerList.getListenerList();    // Process the listeners last to first, notifying    // those that are interested in this event    for(int i = listeners.length - 2; i >= 0; i -= 2)    {      if(listeners[i] == ActionListener.class)      {        // Lazily create the event:        if(actionEvent == null)          actionEvent = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "fileselected");        ((ActionListener)listeners[i + 1]).actionPerformed(actionEvent);      }    }  }  /**   * Removes an <code>ActionListener</code> from the field.   *   * @param l the listener to be removed   */  public void removeActionListener(ActionListener l)  {    listenerList.remove(ActionListener.class, l);  }  /**   * Returns an array of all the <code>ActionListener</code>s added   * to this FileField with addActionListener().   *   * @return all of the <code>ActionListener</code>s added or an empty   *         array if no listeners have been added   */  public ActionListener[] getActionListeners()  {    return (ActionListener[])(listenerList.getListeners(ActionListener.class));  }  public void setButtonIcon(Icon icon)  {    button.setIcon(icon);  }  public void setButtonEnabled(boolean flag)  {    buttonEnabled = flag;    setEnabled(isEnabled());  }  public void setEnabled(boolean enabled)  {    super.setEnabled(enabled);    button.setEnabled(enabled && buttonEnabled);    field.setEnabled(enabled);  }  public FixedButton getButton()  {    return button;  }  public JTextField getTextField()  {    return field;  }  public String getText()  {    return field.getText().trim();  }  public void setText(String s)  {    field.setText(s);  }  public File getFile()  {    return file;  }  public void setTextFieldPreferredWidth(int i)  {    Dimension dimension = field.getPreferredSize();    FontMetrics fontmetrics = field.getFontMetrics(field.getFont());    dimension.width = fontmetrics.charWidth('a') * i;    field.setPreferredSize(dimension);  }  public boolean isEditable()  {    return field.isEditable();  }  public void setEditable(boolean flag)  {    field.setEditable(flag);  }}