rangebeancustomizer.java~50~

java bean 编程程序

package chapter8;

import java.awt.*;
import javax.swing.*;
import java.beans.Customizer;
import java.beans.PropertyChangeListener;
import com.borland.jbcl.layout.XYLayout;
import com.borland.jbcl.layout.*;
import java.beans.PropertyChangeSupport;
import java.beans.PropertyVetoException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class RangeBeanCustomizer
    extends JPanel implements Customizer
{
    XYLayout xYLayout1 = new XYLayout();
    JLabel jLabel1 = new JLabel();
    JTextField fromFld = new JTextField();
    JLabel jLabel2 = new JLabel();
    JTextField toFld = new JTextField();
    JLabel jLabel3 = new JLabel();
    String[] lblStyles =
        {"英文标签", "中文标签", "数学标签"};
    JComboBox lblStyleCmbox = new JComboBox(lblStyles);
    JButton okBtn = new JButton();
    JButton cancelBtn = new JButton();
    private transient PropertyChangeSupport pcs = new
        PropertyChangeSupport(this);
    private RangeBean oldRangeBean;
    private int oldFrom;
    private int oldTo;
    private int oldLblStyle;

    public RangeBeanCustomizer()
    {
        try
        {
            jbInit();
        }
        catch (Exception exception)
        {
            exception.printStackTrace();
        }
    }

    private void jbInit()
        throws Exception
    {
        this.setLayout(xYLayout1);
        jLabel1.setText("下限值");
        jLabel2.setText("上限值");
        jLabel3.setText("标签样式");
        okBtn.setText("确定"); okBtn.addActionListener(new
            RangeBeanCustomizer_okBtn_actionAdapter(this));
        cancelBtn.setText("取消");
        this.add(jLabel2, new XYConstraints(182, 25, -1, -1)); this.add(
            jLabel3, new XYConstraints(57, 62, -1, -1)); this.
            add(jLabel1, new XYConstraints(65, 26, -1, -1)); this.
            add(fromFld, new XYConstraints(102, 23, 64, -1)); this.add(
                toFld, new XYConstraints(231, 23, 62, -1)); this.add(cancelBtn,
            new XYConstraints(188, 95, -1, -1)); this.add(okBtn,
            new XYConstraints(112, 95, -1, -1)); this.add(lblStyleCmbox,
            new XYConstraints(102, 56, 191, -1));
    }

    public void setObject(Object bean)
    {
        if (bean instanceof RangeBean)
        {
            oldRangeBean = (RangeBean) bean;
            oldFrom = oldRangeBean.getFrom();
            oldTo = oldRangeBean.getTo();
            oldLblStyle = oldRangeBean.getLblStyle();
            fromFld.setText("" + oldFrom);
            toFld.setText("" + oldTo);
            lblStyleCmbox.setSelectedIndex(oldLblStyle);
        }
    }

    public synchronized void addPropertyChangeListener(PropertyChangeListener
        l)
    {
        super.addPropertyChangeListener(l);
        if (pcs == null)
        {
            pcs = new PropertyChangeSupport(this);
        }
        pcs.addPropertyChangeListener(l);
    }

    public synchronized void removePropertyChangeListener(
        PropertyChangeListener l)
    {
        super.removePropertyChangeListener(l);
        if (pcs == null)
        {
            pcs = new PropertyChangeSupport(this);
        }
        pcs.removePropertyChangeListener(l);
    }

    //更新from的值
    private void changeFromProperty(Integer newFrom)
    {
        Integer currentFrom = new Integer(oldRangeBean.getFrom());
        try
        {
            oldRangeBean.setFrom(newFrom.intValue());
        }
        catch (PropertyVetoException ex)
        {
            ex.printStackTrace();
        }
        if (pcs != null)
        {
            pcs.firePropertyChange("from", currentFrom, newFrom);
        }
    }

    //更新to的值
    private void changeToProperty(Integer newTo)
    {
        Integer currentTo = new Integer(oldRangeBean.getTo());
        try
        {
            oldRangeBean.setTo(newTo.intValue());
        }
        catch (PropertyVetoException ex)
        {
            ex.printStackTrace();
        }
        if (pcs != null)
        {
            pcs.firePropertyChange("to", currentTo, newTo);
        }
    }

    //更新lblStyle的值
    private void changeLblStyleProperty(Integer newLblStyle)
    {
        Integer currentLblStyle = new Integer(oldRangeBean.getLblStyle());
        oldRangeBean.setLblStyle(newLblStyle.intValue());
        if (pcs != null)
        {
            pcs.firePropertyChange("lblStyle", currentLblStyle, newLblStyle);
        }
    }

    public void okBtn_actionPerformed(ActionEvent e)
    {
        try
        {
            int newFrom = (new Integer(fromFld.getText())).intValue();
            int newTo = (new Integer(toFld.getText())).intValue();
            int newLblStyle = lblStyleCmbox.getSelectedIndex();
            if (newFrom > newTo)
            {
                JOptionPane.showMessageDialog(this, "下限值必须大于等于上限值", "值设置错误",
                                              JOptionPane.OK_OPTION);
                return;
            }
            changeFromProperty(new Integer(newFrom));
            changeToProperty(new Integer(newTo));
            changeLblStyleProperty(new Integer(newLblStyle));
        }
        catch (NumberFormatException ex)
        {
            JOptionPane.showMessageDialog(this, "上下限值必须是整数型值", "值设置错误",
                                          JOptionPane.OK_OPTION);
            return;
        }
    }
}

class RangeBeanCustomizer_okBtn_actionAdapter
    implements ActionListener
{
    private RangeBeanCustomizer adaptee;
    RangeBeanCustomizer_okBtn_actionAdapter(RangeBeanCustomizer adaptee)
    {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e)
    {
        adaptee.okBtn_actionPerformed(e);
    }
}