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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.ArrayList;
public class GridDemo extends JApplet
{
int slideNumber = 0; // The slide currently on the screen
int numSlides = 0; // Number of slides
ArrayList slides = new ArrayList();
Timer timer;
static int TICKS_PER_SEC = 8;
int ticksToGo;
int delaySecs;
float busyVal = 0.0f;
boolean autoAdvance;
SlidePanel slidePanel;
JPanel statusPanel; // The entire status line at the bottom
JLabel captionPanel; // The slide caption in the middle of the status
class Slide
{
private Image image;
private String name;
private String caption;
private MediaTracker mt;
private JApplet comp;
//public Slide(String name, String caption, JApplet comp)
//{
// this.name = name;
// this.caption = caption;
// this.image = null;
// this.comp = comp;
// this.mt = new MediaTracker(comp);
//}
// Start loading the image associated with the slide
public void startLoading()
{
if (name.length() > 0 && image == null)
{
image = comp.getImage(getDocumentBase(), name);
if (image == null)
{
/* Some browsers tell us immediately if the file was not found */
unload();
slidePanel.setMessage("Slide missing!");
}
else
{
mt.addImage(image, 0);
mt.checkID(0, true); // Start loading this image right away
}
}
}
public boolean isLoaded()
{
return mt.checkID(0);
}
public void unload()
{
if (image != null)
{
mt.removeImage(image);
image = null; // Delete the image
}
}
// Display the slide, waiting if necessary for it to fully load
// first. If it fails to load, display a message.
public void display()
{
// Make sure image is fully loaded, waiting if necessary.
try { mt.waitForID(0); }
catch (InterruptedException ex) { }
if (mt.isErrorID(0))
{
unload();
slidePanel.setMessage("Slide missing!");
}
// Display the slide
slidePanel.setImage(image);
// Update the caption at the bottom of the screen
captionPanel.setText(caption);
}
}
public String[][] getParameterInfo()
{
String[][] info = {
// Parameter Name Kind of Value Description
{"autoadvance", "yes/no", "Auto-advance the slide show"},
{"time", "int", "Time between slides in seconds"},
{"dir", "string", "Subdirectory containing the slides"},
{"1", "string", "Slide 1 filename,Caption"},
{"2", "string", "Slide 2 filename,Caption"},
{"3", "string", "Slide 3 filename,Caption"},
{"...", "...", "... etc"},
};
return info;
}
public String getAppletInfo()
{
return "JustSlides";
}
public void init()
{
String str;
// Set seconds between slides
str = getParameter("time");
delaySecs = 10;
try
{
if (str != null)
delaySecs = Integer.parseInt(str);
}
catch (Exception e) { }
// Start with autoadvance on?
str = getParameter("autoadvance");
autoAdvance = false;
if (str != null)
{
if (str.equalsIgnoreCase("yes"))
autoAdvance = true;
}
// Subdirectory for slides
String dir = getParameter("dir");
if (dir == null)
dir = "";
// Slide 0 is always the Loading... slide. It has no associated image
//slides.add(new Slide("", "Just Slides (c) 2003 Ian Goldby", this));
// Read in list of slides
numSlides = 1;
String file;
//String caption;
int comma;
while ((str = getParameter(String.valueOf(numSlides))) != null)
{
comma = str.indexOf(',');
if (comma == -1)
comma = str.length();
file = str.substring(0, comma);
if (comma < (str.length()-1))
caption = str.substring(comma+1);
else
caption = "";
s slides.add(new Slide(dir + "/" + file, caption, this));
numSlides++;
}
// Create the slide area
slidePanel = new SlidePanel();
slidePanel.setBackground(Color.black);
slidePanel.setForeground(Color.yellow);
slidePanel.setOpaque(true);
// Create the status panel
statusPanel = new JPanel();
statusPanel.setLayout(new BoxLayout(statusPanel, BoxLayout.X_AXIS));
statusPanel.setBorder(BorderFactory.createEmptyBorder());
statusPanel.setBackground(Color.black);
statusPanel.setOpaque(true);
// (The ContentPane's default layout is BorderLayout.)
getContentPane().add(slidePanel, BorderLayout.CENTER);
getContentPane().add(statusPanel, BorderLayout.SOUTH);
// Create the slide caption next
captionPanel = new JLabel(" ", JLabel.CENTER);
captionPanel.setBackground(Color.black);
captionPanel.setForeground(Color.white);
captionPanel.setOpaque(true);
captionPanel.setBorder(BorderFactory.createEmptyBorder(0, 4, 0, 0));
// If there is not enough width, allow caption to be truncated
captionPanel.setMinimumSize(new Dimension(0, captionPanel.getMinimumSize().height*5/4));
// Buttons size themselves to the minimum size of the status panel
statusPanel.setMinimumSize(new Dimension(0, captionPanel.getMinimumSize().height));
// Add the caption, and transport buttons to the status bar
statusPanel.add(captionPanel);
// Add the stretchy glue to take up the free space
statusPanel.add(Box.createHorizontalGlue());
ActionListener buttonListener = new ButtonListener();
Dimension d = new Dimension(captionPanel.getMinimumSize().height, captionPanel.getMinimumSize().height);
// Start loading the first slide
firstSlide();
}
public void start()
{
if (numSlides > 1)
startTimer();
}
// Can be invoked from any thread.
public synchronized void startTimer()
{
// Start animating!
if (!timer.isRunning())
{
timer.setInitialDelay(0);
timer.start();
}
}
// Goes to the next slide.
private void nextSlide()
{
if (slideNumber < numSlides-1)
{
// Unload the previous slide (if any)
if (slideNumber > 1)
((Slide)slides.get(slideNumber-1)).unload();
// Display next slide
slideNumber++;
((Slide)slides.get(slideNumber)).display();
// Start loading the next slide after this (if any)
if (slideNumber < numSlides-1)
{
((Slide)slides.get(slideNumber+1)).startLoading();
// If the slide is not already loaded, start the timer to enable
// the animation effect.
if (!((Slide)slides.get(slideNumber+1)).isLoaded())
startTimer();
}
}
}
// Goes to the previous slide.
private void previousSlide()
{
if (slideNumber > 1) // 1 is the first real slide.
{
// Unload the next slide (if any)
if (slideNumber < numSlides-1)
((Slide)slides.get(slideNumber+1)).unload();
// Display previous slide
slideNumber--;
((Slide)slides.get(slideNumber)).display();
// Start loading the previous slide before this (if any)
if (slideNumber > 1)
((Slide)slides.get(slideNumber-1)).startLoading();
// If the slide is not already loaded, start the timer to enable
// the animation effect.
if (!((Slide)slides.get(slideNumber-1)).isLoaded())
startTimer();
}
}
// Goes to the first slide.
private void firstSlide()
{
// Unload the old next cached slide (if any)
if (slideNumber > 2 && slideNumber < numSlides-1)
((Slide)slides.get(slideNumber+1)).unload();
// Unload the old current slide (if any)
if (slideNumber > 3)
((Slide)slides.get(slideNumber)).unload();
// Unload the old previous cached slide (if any)
if (slideNumber > 4)
((Slide)slides.get(slideNumber-1)).unload();
slideNumber = 0;
if (numSlides > 1)
{
slidePanel.setMessage("Loading...");
((Slide)slides.get(0)).display();
((Slide)slides.get(1)).startLoading();
}
else
slidePanel.setMessage("No slides");
ticksToGo = 0;
startTimer();
}
// The action listener that responds to button presses
class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String actionCommand = e.getActionCommand();
}
}
}
class SlidePanel extends JPanel
{
Image image;
String message;
public SlidePanel()
{
image = null;
message = "Loading...";
}
public void setImage(Image image)
{
this.image = image;
repaint();
}
public void setMessage(String message)
{
this.message = message;
repaint();
}
public void paintComponent(Graphics g)
{
// Draw the background
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g; // So we can antialias text
// Get the available drawing area
int cw, ch, cx, cy;
Insets insets = getInsets();
cx = insets.left;
cy = insets.top;
cw = getWidth() - cx - insets.right;
ch = getHeight() - cy - insets.bottom;
if (image == null)
{
int x, y;
RenderingHints hints =
new RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2.addRenderingHints(hints);
Font font = getFont();
font = font.deriveFont(font.BOLD, 24.0f);
g2.setFont(font);
g2.setColor(Color.yellow);
FontMetrics metrics = g2.getFontMetrics();
int w = metrics.stringWidth(message);
int h = metrics.getHeight();
g2.drawString(message, (cw-w)/2, (ch-h)/2);
}
else
{
double scale;
int width, height, x, y;
RenderingHints hints =
new RenderingHints(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g2.addRenderingHints(hints);
// Calculate optimum image size
scale = (double)cw/(double)image.getWidth(this);
if ((double)image.getHeight(this) * scale > (double)ch)
scale = (double)ch/(double)image.getHeight(this);
width = (int)(scale * image.getWidth(this));
height = (int)(scale * image.getHeight(this));
x = cx + (cw - width)/2;
y = cy + (ch - height)/2;
// Draw the image
g2.drawImage(image, x, y, x + width, y + height,
0, 0, image.getWidth(this), image.getHeight(this), this);
}
}
}
Here is the my HTML code:
<html> <head> <title>My Slide Show</title> </head> <body> <applet code="GridDemo.class" width="500" height="500"> <param name="autoadvance" value="yes"> <param name="time" value="10"> <param name="dir" value="slides"> <param name="1" value="summer1.jpg"> <param name="2" value="summer2.jpg"> <param name="3" value="summer3.jpg"> <param name="4" value="summer4.jpg"> <param name="5" value="summer5.jpg"> <param name="6" value="summer6.jpg"> <param name="7" value="summer7.jpg"> <param name="8" value="summer8.jpg"> <param name="9" value="summer9.jpg"> <param name="10" value="SummerSun.gif"> </applet> </body> </html>
When I try to bring it up in the web browser, nothing appears. I do have all my images named correctly.
MultiQuote
If I were the problem, I would be in lines 178 and 179. You don't want to add the panels to the content pane until you are done setting their parameters. My next step would be to move those two lines down to line 199, towards the end of your init() method. You shouldn't add content until you are done altering it's settings. Give it a shot and we'll go from there. Sorry about the earlier post!
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