/*
 * Gary Cornell and Cay S. Horstmann, Core Java (Book/CD-ROM)
 * Published By SunSoft Press/Prentice-Hall
 * Copyright (C) 1996 Sun Microsystems Inc.
 * All Rights Reserved. ISBN 0-13-596891-7
 *
 * Permission to use, copy, modify, and distribute this 
 * software and its documentation for NON-COMMERCIAL purposes
 * and without fee is hereby granted provided that this 
 * copyright notice appears in all copies. 
 * 
 * THE AUTHORS AND PUBLISHER MAKE NO REPRESENTATIONS OR 
 * WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHORS
 * AND PUBLISHER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED 
 * BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING 
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */
 
/**
 * @version 1.01 07 Sep 1996 
 * @author Cay Horstmann
 */

import java.awt.*;
import java.applet.*;
import java.util.*;
import java.net.*;
import corejava.*;

public class PriceListTest extends Applet
{  public void init()
   {  setLayout(new BorderLayout());
      Panel p = new Panel();
      p.setLayout(new FlowLayout());
      name = new Choice();

      try      
      {  URL url = new URL(getDocumentBase(), "prices.dat");
         prices.load(url.openStream());
      } catch(Exception e) {}

      Enumeration e = prices.propertyNames();
      while (e.hasMoreElements())
         name.addItem(((String)e.nextElement())
            .replace('+', ' '));
      quantity = new IntTextField(1, 0, 100, 4);
      p.add(name);
      p.add(quantity);
      p.add(new Button("Add"));
      p.add(new Button("Done"));
      add("North", p);
      add("Center", canvas = new PurchaseOrderCanvas());
      canvas.resize(250, 150);
      canvas.redraw(a);
   }
   
   public boolean action(Event evt, Object arg)
   {  if (arg.equals("Add"))
      {  if (quantity.isValid())
         {  String itemName = name.getSelectedItem();
            a.addElement(new Item(itemName, 
               quantity.getValue(), 
               Format.atof((String)prices.get(itemName
               .replace(' ', '+')))));
         }
      }   
      else if (arg.equals("Done"))
      {  a.addElement(new Item("State Tax", 1, 0.00));
         a.addElement(new Item("Shipping", 1, 5.00));
         a.trimToSize();
      }
      else return super.action(evt, arg);
      canvas.redraw(a);
      return true;
   }

   private Vector a = new Vector();
   private Choice name;
   private IntTextField quantity;
   private PurchaseOrderCanvas canvas;   
   private int m = 1;
   private Properties prices = new Properties();
}

class Item
{  Item(String n, int q, double u)
   {  name = n;
      quantity = q;
      unitPrice = u;
   }
   
   public String toString()
   {  return new Format("%-20s").form(name)
         + new Format("%6d").form(quantity)
         + new Format("%8.2f").form(unitPrice);
   }

   private String name;
   private int quantity;
   private double unitPrice;
}

class PurchaseOrderCanvas extends Canvas
{  public void redraw(Vector new_a)
   {  a = new_a;
      repaint();
   }
   
   public void paint(Graphics g)
   {  Font f = new Font("Courier", Font.PLAIN, 12);
      g.setFont(f);
      FontMetrics fm = g.getFontMetrics(f);
      int height = fm.getHeight();
      int x = 80;
      int y = 0; 
      int i = 0;
      y += height;
      g.drawString("Your Order: ", x, y);
      for (i = 0; i < a.size(); i++)
      {  y += height;      
         g.drawString(a.elementAt(i).toString(), x, y);
      }
   }
  
   private Vector a;
}