calendarhack.java

oraily的Swing hacks code

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

public class CalendarHack extends JPanel {
    protected Image background, highlight, day_img;
    protected SimpleDateFormat month = new SimpleDateFormat("MMMM");
    protected SimpleDateFormat year = new SimpleDateFormat("yyyy");
    protected SimpleDateFormat day = new SimpleDateFormat("d");
    protected Date date = new Date();
    
    public void setDate(Date date) {
        this.date = date;
    }
    public CalendarHack() {
        background = new ImageIcon("calendar.png").getImage();
        highlight = new ImageIcon("highlight.png").getImage();
        day_img = new ImageIcon("day.png").getImage();
        this.setPreferredSize(new Dimension(300,280));
    }
    
    public void paintComponent(Graphics g) {
        ((Graphics2D)g).setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
        g.drawImage(background,0,0,null);
        g.setColor(Color.black);
        g.setFont(new Font("SansSerif",Font.PLAIN,18));
        g.drawString(month.format(date),34,36);
        g.setColor(Color.white);
        g.drawString(year.format(date),235,36);
        
        Calendar today = Calendar.getInstance();
        today.setTime(date);
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.set(Calendar.DATE,1);
        cal.add(Calendar.DATE,-cal.get(Calendar.DAY_OF_WEEK)+1);
        for(int week = 0; week < 6; week++) {
            for(int d = 0; d < 7; d++) {
                Image img = day_img;
                Color col = Color.black;
                // only draw if it's actually in this month
                if(cal.get(Calendar.MONTH) == today.get(Calendar.MONTH)) {
                    if(cal.equals(today)) { img = highlight; col = Color.white; }
                    g.drawImage(img,d*30+46,week*29+81,null);
                    g.drawString(day.format(cal.getTime()),d*30+46+4,week*29+81+20);
                }
                cal.add(Calendar.DATE,+1);
            }
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        CalendarHack ch = new CalendarHack();
        ch.setDate(new Date());
        frame.getContentPane().add(ch);
        frame.setUndecorated(true);
        
        MoveMouseListener mml = new MoveMouseListener(ch);
        ch.addMouseListener(mml);
        ch.addMouseMotionListener(mml);

        
        frame.pack();
        frame.setVisible(true);
    }
}