/* File: GIFCanvasApplet.java
 * Copyright (C) 1998 by Bill Giel/KCMDG. All rights reserved.
 *
 * This little applet demonstrates use of the GIFCanvas package
 * to display animated GIF's in a Java applet (or application.)
 */

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

import com.kcmultimedia.gifcanvas.GIFCanvas;

public class GIFCanvasApplet extends Applet
{
    public static final String MSG = "Select an image, press Show";
    Choice picker;
    Button show;
    GIFCanvas canvas;
    boolean hasImage;
    TextField lbl;
    
    public void init()
    {
        setBackground(new Color(204,204,204));
        Panel p = new Panel();
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
        setLayout(new BorderLayout());
        p.setLayout(gridbag);
        picker = new Choice();
        show = new Button("Show");
        canvas = new GIFCanvas();
       
        lbl = new TextField(MSG);
        lbl.setEditable(false);

        picker.addItem("gears.gif");
        picker.addItem("compass.gif");
        picker.addItem("world.gif");
        picker.addItem("eye.gif");
        picker.addItem("book.gif");

        c.weightx=1;
        c.weighty=0;
        c.gridwidth=1;
        c.fill=GridBagConstraints.HORIZONTAL;
        c.anchor=GridBagConstraints.EAST;
        c.insets = new Insets(5,5,5,2);
        gridbag.setConstraints(picker,c);
        p.add(picker);

        c.weightx=0;
        c.weighty=0;
        c.gridwidth=GridBagConstraints.REMAINDER;
        c.fill=GridBagConstraints.NONE;
        c.anchor=GridBagConstraints.WEST;        
        c.insets = new Insets(5,2,5,5);
        gridbag.setConstraints(show,c);
        p.add(show);

        c.weightx=1;
        c.weighty=1;
        c.gridwidth=GridBagConstraints.REMAINDER;
        c.fill=GridBagConstraints.BOTH;
        c.anchor=GridBagConstraints.CENTER;
        c.insets = new Insets(5,5,5,5);
        gridbag.setConstraints(canvas,c);
        p.add(canvas);

        add("Center",p);
        add("South",lbl);
    }

    //When the applet stops, stop the animation thread.
    
    public void stop()
    {
        if(hasImage){
            canvas.stop();
        }
        super.stop();
    }

    //If we restart from a backlink, and we had an image, we can simply
    //restart the animation. Netscape Navigator does this correctly. IE
    //apparently does not.
    
    public void start()
    {
        if(hasImage){
            canvas.start();
        }
    }

    public boolean action(Event e, Object arg)
    {
        URL imageurl = null;
        
		if(e.target.equals(show)){
            lbl.setText("Loading image...");
	        canvas.hide();        
	        try{
	            imageurl = new URL(getCodeBase(),"/" + picker.getSelectedItem());
	            canvas.setImage(imageurl);
	            canvas.show();
	            lbl.setText(MSG);
	            hasImage=true;
	            canvas.start();
	        }catch(Exception ee){
	            lbl.setText("An error occured!");
	            if(imageurl != null)
	                System.out.println("Error loading image: " + imageurl.toString());
	            hasImage=false;
	        }
			return true;
		}

		else return super.action(e,arg);
	}

}