fontcolor.java

《java事件处理指南》一书的代码,好东西

import javax.swing.*;
import java.awt.*;
import java.beans.*;

public class FontColor
{
   private Color color;
   private PropertyChangeSupport pcs;

   public FontColor(Color c)
   {
      color = c;
      pcs = new PropertyChangeSupport(this);
   }

   public Color getColor()
   {
      return color;
   }

/*  The Color object is implemented as a bound property. When the   */
/*  setColor() method is called, the PropertyChangeSupport object   */
/*  is used to fire a PropertyChangeEvent.                          */

   public void setColor(Color c)
   {
      Color oldColor = color;
      color = c;
      pcs.firePropertyChange("color", oldColor, color);
   }

/*  For the FontColor class to be able to register/de-register a     */
/*  PropertyChangeListener, it has to provide methods to add         */
/*  and remove PropertyChangeListeners.  The PropertyChangeSupport   */
/*  is used to manage the listener list.                             */

   public void addPropertyChangeListener(PropertyChangeListener listener)
   {
      pcs.addPropertyChangeListener(listener);
   }

   public void removePropertyChangeListener(PropertyChangeListener listener)
   {
      pcs.removePropertyChangeListener(listener);
   }
}