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.*;

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);  
   }
}