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Pane.java

00001 package edu.virtualschool.jwaa.swing;
00002 import java.awt.Dimension;
00003 import java.awt.FlowLayout;
00004 import java.awt.Graphics;
00005 import java.awt.Image;
00006 import java.awt.LayoutManager;
00007 import java.net.URL;
00008 
00009 import javax.swing.ImageIcon;
00010 import javax.swing.JComponent;
00011 
00012 import edu.virtualschool.jwaa.RuntimeFault;
00013 import edu.virtualschool.jwaa.resource.Resource;
00014 
00018 public class Pane extends JComponent
00019 {
00020   final static boolean isMac = System.getProperty("mrj.version") != null;
00021   static Image image;
00022   final static String name = "Pane.png";
00023 
00024   public Pane()
00025   {
00026     this(new FlowLayout());
00027   }
00028   public Pane(LayoutManager m)
00029   {
00030     setLayout(m);
00031   }
00032   public void paintComponent(Graphics graphic) 
00033   {
00034     super.paintComponent(graphic);
00035     if (isMac) return;
00036     // Defer loading til first use to work around JVM crash
00037     // associated with obfuscation. I think the switch from
00038     // .jpg to .png may have fixed this but play it safe for
00039     // now.
00040     if (image == null)
00041     {
00042       URL url = Resource.class.getResource(name);
00043       if (url == null)
00044         throw new RuntimeFault(name+" not found");
00045       ImageIcon img = new ImageIcon(url, name);
00046       image = img.getImage();
00047     }
00048     Dimension dim = this.getSize();
00049     int dx = image.getWidth(this);
00050     int dy = image.getHeight(this);
00051     for (int x = 0; x < dim.width; x += dx) 
00052       for (int y = 0; y < dim.height; y += dy) 
00053         graphic.drawImage(image, x, y, this);
00054   }
00055 }