jcalendarpanel.java

java+sql 图书管理系统

package MyLibraryok.borrow.ziliao;

import java.awt.*;
import java.awt.event.*;
import java.text.DateFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2007</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */


public class JCalendarPanel extends JPanel{
    private static Border selectedBorder = new LineBorder(Color.black);
    private static Border unselectedBorder = new EmptyBorder(
        selectedBorder.getBorderInsets(new JLabel()));

    private Calendar calendar = null;
    private JLabel monthLabel = null;
    private JPanel days = null;
    private MouseListener dayBttListener = null;
    private boolean isSupportDateChangeListener = false;

    protected Color selectedBackground;
    protected Color selectedForeground;
    protected Color background;
    protected Color foreground;
    private java.util.Date selectedDate = null;
    /**
     * 年月格式
     */
    final SimpleDateFormat monthFormat
        = new SimpleDateFormat("yyyy-MM");

    public JCalendarPanel(){
        this(new Date());
    }

    public JCalendarPanel(Date selectedDate){
        this.selectedDate = selectedDate;
        calendar = Calendar.getInstance();

        selectedBackground = UIManager.getColor(
            "ComboBox.selectionBackground");
        selectedForeground = UIManager.getColor(
            "ComboBox.selectionForeground");
        background = UIManager.getColor("ComboBox.background");
        foreground = UIManager.getColor("ComboBox.foreground");

        dayBttListener = createDayBttListener();

        //   << <   yyyy/MM/dd  > >>
        JPanel pNorth = new JPanel();
        pNorth.setLayout(new BoxLayout(pNorth, BoxLayout.X_AXIS));
        pNorth.setBackground(new Color(0, 0, 128));
        pNorth.setForeground(Color.white);
        pNorth.setPreferredSize(new Dimension(1, 25));

        JLabel label;
        label = createSkipButton(Calendar.YEAR, -1);
        label.setText("<<");
        pNorth.add(Box.createHorizontalStrut(12));
        pNorth.add(label);
        pNorth.add(Box.createHorizontalStrut(12));

        label = createSkipButton(Calendar.MONTH, -1);
        label.setText("< ");
        pNorth.add(label);

        monthLabel = new JLabel("", JLabel.CENTER);
        monthLabel.setBackground(new Color(0, 0, 128));
        monthLabel.setForeground(Color.white);
        pNorth.add(Box.createHorizontalGlue());
        pNorth.add(monthLabel);
        pNorth.add(Box.createHorizontalGlue());

        label = createSkipButton(Calendar.MONTH, 1);
        label.setText(" >");
        pNorth.add(label);

        label = createSkipButton(Calendar.YEAR, 1);
        label.setText(">>");

        pNorth.add(Box.createHorizontalStrut(12));
        pNorth.add(label);
        pNorth.add(Box.createHorizontalStrut(12));

        //星期日 星期一 星期二 星期三 星期四 星期五 星期六
        JPanel pWeeks = new JPanel(new GridLayout(0, 7));
        pWeeks.setBackground(background);
        pWeeks.setOpaque(true);
        DateFormatSymbols sy = new DateFormatSymbols(Locale.getDefault());
        String strWeeks[] = sy.getShortWeekdays();
        for(int i = 1; i <= 7; i++){
            label = new JLabel();
            label.setHorizontalAlignment(JLabel.CENTER);
            label.setForeground(foreground);
            label.setText(strWeeks[i]);
            pWeeks.add(label);
        }

        //中间放日期的面板
        days = new JPanel(new GridLayout(0, 7));
        days.setBorder(new TopBottomLineBorder(Color.black));
        days.setBackground(background);
        days.setOpaque(true);
        JPanel pCenter = new JPanel(new BorderLayout());
        pCenter.setBackground(background);
        pCenter.setOpaque(true);
        pCenter.add(pWeeks, BorderLayout.NORTH);
        pCenter.add(days, BorderLayout.CENTER);

        //显示今天的日期,直接单击图标跳到今天
        JLabel lbToday = new JDayLabel(new Date(), false);
        lbToday.setForeground(foreground);
        lbToday.addMouseListener(dayBttListener);
        JPanel pSouth = new JPanel(new BorderLayout());
        pSouth.setBackground(background);
        pSouth.setForeground(foreground);
        pSouth.add(lbToday, BorderLayout.CENTER);

        //renderer this
        setPreferredSize(new Dimension(280, 180));
        setForeground(foreground);
        setBackground(background);
        setBorder(BorderFactory.createLineBorder(Color.blue));

        setLayout(new BorderLayout());
        add(BorderLayout.NORTH, pNorth);
        add(BorderLayout.CENTER, pCenter);
        add(BorderLayout.SOUTH, pSouth);

        updateDays();
    }

    /**
     * 创建上一月,下一月,上一年,下一年"按钮"
     * @param field int
     * @param amount int
     * @return JLabel
     */
    protected JLabel createSkipButton(final int field, final int amount){
        JLabel label = new JLabel();
        label.setBorder(unselectedBorder);
        label.setBackground(new Color(0, 0, 128));
        label.setForeground(Color.white);
        label.setRequestFocusEnabled(false);
        label.addMouseListener(createSkipListener(field, amount));
        return label;
    }

    protected MouseListener createSkipListener(final int field,
                                               final int amount){
        return new MouseAdapter(){
            public void mouseReleased(MouseEvent e){
                calendar.add(field, amount);
                updateDays();
            }

            public void mouseEntered(MouseEvent e){
                JComponent com = (JComponent)e.getComponent();
                com.setBorder(selectedBorder);
            }

            public void mouseExited(MouseEvent e){
                JComponent com = (JComponent)e.getComponent();
                com.setBorder(unselectedBorder);
            }
        };
    }

    /**
     * 更新日期
     */
    protected void updateDays(){
        //更新月份
        monthLabel.setText(monthFormat.format(calendar.getTime()));

        days.removeAll();
        Calendar selectedCalendar = Calendar.getInstance();
        selectedCalendar.setTime(selectedDate);
        /**
                        1  2  3  4  5  6  7
         2  3  4  5  6  7  8  9  10 11 12 13
         8  9  10 11 12 13 14 15 16 17 18 19
         14 15 16 17 18 19 20 21 22 23 24 25
         20 21 22 23 24 25 26 27 28 29 30 31
         26 27 28 29 30 31
         */
        Calendar setupCalendar = (Calendar)calendar.clone();
        setupCalendar.set(Calendar.DAY_OF_MONTH, 1);
        int first = setupCalendar.get(Calendar.DAY_OF_WEEK);
        setupCalendar.add(Calendar.DATE, -first);

        boolean isCurrentMonth = false;
        for(int i = 0; i < 42; i++){
            setupCalendar.add(Calendar.DATE, 1);
            JLabel label = new JDayLabel(setupCalendar.getTime());
            label.setForeground(foreground);
            label.addMouseListener(dayBttListener);

            if("1".equals(label.getText())){
                isCurrentMonth = !isCurrentMonth;
            }
            label.setEnabled(isCurrentMonth);
            //当前选择的日期
            if(setupCalendar.get(Calendar.YEAR) ==
               selectedCalendar.get(Calendar.YEAR) &&
               setupCalendar.get(Calendar.MONTH) ==
               selectedCalendar.get(Calendar.MONTH) &&
               setupCalendar.get(Calendar.DAY_OF_MONTH) ==
               selectedCalendar.get(Calendar.DAY_OF_MONTH)){
                label.setBorder(new LineBorder(selectedBackground, 1));
            }
            days.add(label);
        }
        days.validate();
    }

    protected MouseListener createDayBttListener(){
        return new MouseAdapter(){
            public void mousePressed(MouseEvent e){}
            public void mouseClicked(MouseEvent e){}

            public void mouseReleased(MouseEvent e){
                JDayLabel com = (JDayLabel)e.getComponent();
                if(isEnabled()){
                    com.setOpaque(false);
                    com.setBackground(background);
                    com.setForeground(foreground);
                }
                JCalendarPanel.this.isSupportDateChangeListener = true;
                JCalendarPanel.this.setSelectedDate(com.getDate());
                JCalendarPanel.this.isSupportDateChangeListener = false;
            }

            public void mouseEntered(MouseEvent e){
                if(isEnabled()){
                    JComponent com = (JComponent)e.getComponent();
                    com.setOpaque(true);
                    com.setBackground(selectedBackground);
                    com.setForeground(selectedForeground);
                }
            }

            public void mouseExited(MouseEvent e){
                if(isEnabled()){
                    JComponent com = (JComponent)e.getComponent();
                    com.setOpaque(false);
                    com.setBackground(background);
                    com.setForeground(foreground);
                }
            }
        };
        //以上为匿名内部类
    }

    protected EventListenerList listenerList = new EventListenerList();
    public void addDateChangeListener(ChangeListener l){
        listenerList.add(ChangeListener.class, l);
    }

    public void removeDateChangeListener(ChangeListener l){
        listenerList.remove(ChangeListener.class, l);
    }

    protected void fireDateChanged(ChangeEvent e){
        Object[] listeners = listenerList.getListenerList();
        for(int i = listeners.length - 2; i >= 0; i -= 2){
            if(listeners[i] == ChangeListener.class){
                ((ChangeListener)listeners[i + 1]).stateChanged(e);
            }
        }
    }

    public void setSelectedDate(Date selectedDate){
        this.selectedDate = selectedDate;
        this.calendar.setTime(selectedDate);
        updateDays();
        if(isSupportDateChangeListener){
            fireDateChanged(new ChangeEvent(selectedDate));
        }
    }

    public Date getSelectedDate(){
        return selectedDate ;
    }

}