//一個監聽器適合所有calendar事件
private final Button_handler day_listener  = new Button_handler();

private class Button_handler implements ActionListener
{   public void actionPerformed(ActionEvent e)
    {
        if (e.getActionCommand().equals("D"))
        {   String text = ((JButton) e.getSource()).getText();

            if(text.length() > 0)  //  <=0 means click on blank square. Ignore.
            {   calendar.set
                (   calendar.get(Calendar.YEAR),    // Reset the calendar
                    calendar.get(Calendar.MONTH),   // to be the chosen
                    Integer.parseInt(text)          // date.
                );
                selected = calendar.getTime();
                fire_ActionEvent( SELECT_ACTION, selected.toString() );
            }
        }
    }
}

private ActionListener subscribers = null;
public synchronized void addActionListener(ActionListener l)
{   subscribers = AWTEventMulticaster.add(subscribers, l);
}
public synchronized void removeActionListener(ActionListener l)
{   subscribers = AWTEventMulticaster.remove(subscribers, l);
}
private void fire_ActionEvent( int id, String command )
{   if (subscribers != null)
         subscribers.actionPerformed(new ActionEvent(this, id, command) );
}

//這里使用它是一個入口去發送初始化ActionEvent到支持標題的任何實體。
public void addNotify()
{
    super.addNotify();
    int month = calendar.get(Calendar.MONTH);
    int year  = calendar.get(Calendar.YEAR);
    fire_ActionEvent( CHANGE_ACTION, months[month] + " " + year );
}

--");
        days[i] = day;
        day.setBorder (BorderFactory.createEmptyBorder(1,2,1,2));
         day.setFocusPainted (false);   // Cannot get focus
        day.setActionCommand    ("D");
        day.addActionListener   (day_listener);// Our single listener
        day.setOpaque (false);                  
  // Transparent background
    }
}

private void update_calendar_display()
{
    setVisible(false);  // Improves paint speed and redUCes flicker.

    clear_highlight();

    // The buttons that comprise the calendar are in a single
    // dimensioned array that was added to a 6x7 grid layout in
    // order. Because of the linear structure, it's easy to
    // lay out the calendar just by changing the labels on
    // the buttons. Here's the algorithm used below:
    //
    //  1) Find out the offset to the first day of the month.
    //  2) Clear everything up to that offset.
    //  3) Add the days of the month.
    //  4) Clear everything else.

    int month = calendar.get(Calendar.MONTH);
    int year  = calendar.get(Calendar.YEAR);

    fire_ActionEvent( CHANGE_ACTION, months[month] + " " + year );

    calendar.set( year, month, 1 ); // First day of the current month.

    int first_day_offset = calendar.get(Calendar.DAY_OF_WEEK);      /* 1 */

    assert Calendar.SUNDAY == 0;
    assert first_day_offset < days.length;

    int i = 0;
    while( i < first_day_offset-1 )                              /* 2 */
        days[i++].setText("");

    int day_of_month = 1;
    for(; i < days.length; ++i )                                 /* 3 */
    {
        if( calendar.get(Calendar.MONTH)==today.get(Calendar.MONTH)
        &&  calendar.get(Calendar.YEAR )==today.get(Calendar.YEAR )
        &&  calendar.get(Calendar.DATE )==today.get(Calendar.DATE ) )
        {   highlight( days[i] );
        }

        days[i].setText( String.valueOf(day_of_month) );

        calendar.roll( Calendar.DATE, /*up=*/ true );   // Forward one day.

        day_of_month = calendar.get(Calendar.DATE);
        if( day_of_month == 1 )
            break;
    }

    // Note that we break out of the previous loop with i positioned
    // at the last day we added, thus the following ++ *must* be a
    // preincrement because we want to start clearing at the cell
    // after that.

    while( ++i < days.length )                                 /* 4 */
        days[i].setText("");

    setVisible(true);
}

private JButton highlighted = null;
private void clear_highlight()
{
    if( highlighted != null )
    {   highlighted.setBackground( Color.WHITE );
        highlighted.setForeground( Color.BLACK );
        highlighted.setOpaque(false);
        highlighted = null;
    }
}

private void highlight( JButton cell )
{
    highlighted = cell;
    cell.setBackground( com.holub.ui.Colors.DARK_RED );
    cell.setForeground( Color.WHITE );
    cell.setOpaque( true );
}

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