folder.java

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

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

public class Folder extends JPanel {
    private Color color;
    final int W = 50, H = 30;
    final int tableft = 0, tabheight=4, tabwidth=20, tabslant=3;
    public Folder(Color c) {
        color = c;
    }
//-------------------------------  
    public void draw(Graphics g, int tx, int ty, String name) {
        g.setColor(Color.black);            //outline
        g.drawRect(tx, ty, W, H);
        g.drawString(name, tx, ty + H+15);  //title
        g.setColor(Color.white);
        g.drawLine (tx, ty, tx+W, ty);

        Polygon poly = new Polygon();
        poly.addPoint (tx+tableft,ty);
        poly.addPoint (tx+tableft+tabslant, ty-tabheight);
        poly.addPoint (tx+tabwidth-tabslant, ty-tabheight);
        poly.addPoint (tx+tabwidth, ty);
        g.setColor(Color.black);
        g.drawPolygon (poly);

        g.setColor(color);                  //fill rectangle 
        g.fillRect(tx+1, ty+1, W-1, H-1);
        g.fillPolygon (poly);
        g.setColor(Color.white);
        g.drawLine (tx, ty, tx+W, ty);

        g.setColor(Color.lightGray);        //bend line   
        g.drawLine(tx+1, ty+H-5, tx+W-1, ty+H-5);

        g.setColor(Color.black);            //shadow lines
        g.drawLine(tx, ty+H+1, tx+W-1, ty+H+1);
        g.drawLine(tx+W+1, ty, tx+W+1, ty+H);

        g.setColor(Color.white);            //highlight lines
        g.drawLine(tx+1, ty+1, tx+W-1, ty+1);
        g.drawLine(tx+1, ty+1, tx+1, ty+H-1);  
    }
}