datebeancustomizer.java

Java实例入门

package beantest;

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

/**
 * Title:        制作一个JavaBean
 * Description:  这个工程中我们制作了一个用于日期显示的JavaBean
 * Copyright:    Copyright (c) 2001
 * Company:
 * @author
 * @version 1.0
 */

public class DateBeanCustomizer extends JPanel implements Customizer  ,ActionListener{
  // variables used by the Customizer
  PropertyChangeSupport pcs = null;
  DateBean bean = null;
  Integer oldStyle = null;
  Boolean oldUseMonthString = null;

  // variables used for UI design
  BorderLayout borderLayout1 = new BorderLayout();
  JPanel southPanel = new JPanel();
  FlowLayout fL1 = new FlowLayout();
  JPanel buttonPanel = new JPanel();
  GridLayout gL1 = new GridLayout();
  JLabel title = new JLabel();
  JPanel centerPanel = new JPanel();
  BorderLayout bL2 = new BorderLayout();
  ChoicePanel choices = new ChoicePanel();
  JPanel eastPanel = new JPanel();
  JCheckBox useMS = new JCheckBox();
  public DateBeanCustomizer() {}
  public void setObject(Object in) {
       try { jbInit(); } catch (Exception e) { e.printStackTrace(); }
      if(in instanceof DateBean){
      bean = (DateBean)in;

      // capture old state values for use by revert
      oldStyle = new Integer(bean.getStyle());
      oldUseMonthString = new Boolean(bean.isUseMonthString());

      // seed the customizer with copies the right settings for the current copy
      choices.setSelectedItem(bean.getStyle());
      useMS.setSelected(bean.isUseMonthString());
      }
    else
      System.out.println("how'd that happen?");
  }
   // called when changing the useMonthString property
  private void changeUseMonthStringProperty(Boolean newValue){
    Boolean currentStyle = new Boolean(bean.isUseMonthString());
    bean.setUseMonthString(newValue.booleanValue());
    if(pcs != null)
      pcs.firePropertyChange("useMonthString", currentStyle, newValue);

  }

  // called when changing the style property
  private void changeStyleProperty(Integer newValue){
    Integer currentStyle = new Integer(bean.getStyle());
    bean.setStyle(newValue.intValue());
    if(pcs != null)
      pcs.firePropertyChange("style", currentStyle, newValue);
  }

  // Constructs the UI for the Customizer
  private void jbInit() throws Exception {
    this.setLayout(borderLayout1);
    southPanel.setLayout(fL1);
    fL1.setAlignment(2);
    gL1.setColumns(1);
    gL1.setHgap(5);

    title.setText("Date Bean Customizer");
    useMS.setText("Use Month String");
    useMS.addItemListener(new java.awt.event.ItemListener() {
      public void itemStateChanged(ItemEvent e) {
        useMS_itemStateChanged(e);
      }
    });
    centerPanel.setLayout(bL2);
    buttonPanel.setLayout(gL1);
    this.add(southPanel, BorderLayout.SOUTH);
    southPanel.add(buttonPanel, null);
    this.add(title, BorderLayout.NORTH);
    this.add(centerPanel, BorderLayout.CENTER);
    centerPanel.add(choices, BorderLayout.CENTER);
    centerPanel.add(eastPanel, BorderLayout.EAST);
    eastPanel.add(useMS, null);

    choices.addActionListener(this);
  }

  // Use Insets to make UI stand out when reparented by an IDE
  public Insets getInsets(){ return new Insets(5,5,5,5); }
  public void addPropertyChangeListener(PropertyChangeListener listener) {
     if(pcs == null)
      pcs = new PropertyChangeSupport(this);
    pcs.addPropertyChangeListener(listener);
  }
  public void removePropertyChangeListener(PropertyChangeListener listener) {
   if(pcs != null)
      pcs.removePropertyChangeListener(listener);
  }
   public void actionPerformed(ActionEvent e) {
    changeStyleProperty(new Integer(e.getID()));
  }
  void useMS_itemStateChanged(ItemEvent e) {
    changeUseMonthStringProperty(new Boolean(useMS.isSelected()));
  }
}