|
|
|
PictureButton
/*
* PictureButton.java
*
* Copyright (c) 1999, 2000 by Rüdiger Appel, All Rights Reserved.
*
* 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.
*
* http://www.3quarks.com
*
*/
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.util.*;
public class PictureButton extends Applet implements Runnable
{
private Thread loader = null;
private Thread timer = null;
private boolean allLoaded = false;
private String linkUrl = null;
private String linkTarget = null;
private String linkApplet = null;
private String linkMessage = null;
private Polygon linkArea = null;
private int linkDelay = 0;
private Point imagePosition = null;
private Image normalImage = null;
private Image mouseOverImage = null;
private Image mouseDownImage = null;
private Image currentImage = null;
private Image buffer = null;
private Image backgroundImage = null;
private AudioClip mouseDownSound = null;
private boolean isMouseOver = false;
private boolean isMouseDown = false;
private boolean isMouseCapture = false;
private boolean isStatusMessage = false;
public PictureButton ()
{
// write applet info
System.out.println (getAppletInfo ());
}
public String getAppletInfo ()
{
// return my copyright notice
return "PictureButton, Version 1.0"
+ System.getProperty ("line.separator")
+ "Copyright (c) 1999, 2000 by Rüdiger Appel, All Rights Reserved"
+ System.getProperty ("line.separator")
+ "http://www.3quarks.com";
}
public void init ()
{
// get link parameters
linkUrl = getParameter ("LinkUrl");
linkTarget = getParameter ("LinkTarget");
linkApplet = getParameter ("LinkApplet");
linkMessage = getParameter ("LinkMessage");
linkDelay = getIntegerParameter ("LinkDelay", 100);
linkArea = getPolygonParameter ("LinkArea");
// get image position
imagePosition = getPointParameter ("ImagePosition");
// get and set background parameters
Color backgroundColor = getColorParameter ("BackgroundColor");
if (backgroundColor != null)
setBackground (backgroundColor);
}
private int getIntegerParameter (String name, int defaultValue)
{
// return an integer parameter
try
{
return Integer.parseInt (getParameter (name).trim ());
}
catch (Exception exception)
{
return defaultValue;
}
}
private Polygon getPolygonParameter (String name)
{
// return a polygon parameter
try
{
StringTokenizer tokenizer = new StringTokenizer (getParameter (name), ",");
Polygon polygon = new Polygon ();
while (true)
if (tokenizer.hasMoreTokens ())
polygon.addPoint (Integer.parseInt (tokenizer.nextToken ().trim ()),
Integer.parseInt (tokenizer.nextToken ().trim ()));
else
return polygon;
}
catch (Exception exception) {}
return null;
}
private Point getPointParameter (String name)
{
// return a point parameter
try
{
StringTokenizer tokenizer = new StringTokenizer (getParameter (name), ",");
if (tokenizer.countTokens () == 2)
return new Point (Integer.parseInt (tokenizer.nextToken ().trim ()),
Integer.parseInt (tokenizer.nextToken ().trim ()));
}
catch (Exception exception) {}
return null;
}
private Color getColorParameter (String name)
{
// return a color parameter
try
{
StringTokenizer tokenizer = new StringTokenizer (getParameter (name), ",");
switch (tokenizer.countTokens ())
{
case 1:
{
String value = tokenizer.nextToken ().trim ();
if ((value.length () == 7) && (value.charAt (0) == '#'))
return new Color (Integer.parseInt (value.substring (1, 3), 16),
Integer.parseInt (value.substring (3, 5), 16),
Integer.parseInt (value.substring (5, 7), 16));
}
case 3:
return new Color (Integer.parseInt (tokenizer.nextToken ().trim ()),
Integer.parseInt (tokenizer.nextToken ().trim ()),
Integer.parseInt (tokenizer.nextToken ().trim ()));
}
}
catch (Exception exception) {}
return null;
}
public void update (Graphics graphics)
{
paint (graphics);
}
public void paint (Graphics graphics)
{
// get applet size
int width = size ().width;
int height = size ().height;
// create buffer if not exist
if (buffer == null)
buffer = createImage (width, height);
// get buffer graphics
Graphics bufferGraphics = buffer.getGraphics ();
bufferGraphics.clipRect (0, 0, width, height);
// fill background
bufferGraphics.setColor (getBackground ());
bufferGraphics.fillRect (0, 0, width, height);
// draw background
if (backgroundImage != null)
{
int backgroundWidth = backgroundImage.getWidth (this);
int backgroundHeight = backgroundImage.getHeight (this);
for (int x = 0; x < width; x += backgroundWidth)
for (int y = 0; y < height; y += backgroundHeight)
bufferGraphics.drawImage (backgroundImage, x, y, this);
}
// paint button image
currentImage = getButtonImage ();
if (currentImage != null)
if (imagePosition != null)
bufferGraphics.drawImage (currentImage,
imagePosition.x,
imagePosition.y,
this);
else
bufferGraphics.drawImage (currentImage,
(width - currentImage.getWidth (this)) / 2,
(height - currentImage.getHeight (this)) / 2,
this);
// paint buffer
graphics.drawImage (buffer, 0, 0, this);
}
private Image getButtonImage ()
{
Image image = null;
// select an image
if (isMouseOver)
if (isMouseDown)
image = mouseDownImage;
else
image = mouseOverImage;
else
image = normalImage;
// check selected image
if (image != null)
return image;
// select mouse over image if mouse over button
if (isMouseOver && (mouseOverImage != null))
return mouseOverImage;
// select normal image
return normalImage;
}
private void updateButton (boolean over, boolean down, boolean capture)
{
// play sound if button goes down
if (down && !isMouseDown && (mouseDownSound != null))
mouseDownSound.play ();
// save mouse flags
isMouseOver = over;
isMouseDown = down;
isMouseCapture = capture;
// update button image
if (currentImage != getButtonImage ())
repaint ();
// update browser status line
if (isStatusMessage != (isMouseOver || isMouseDown))
{
isStatusMessage = isMouseOver || isMouseDown;
if (isStatusMessage)
{
if (linkMessage != null)
showStatus (linkMessage);
else
if (linkUrl != null)
showStatus (linkUrl);
}
else
showStatus ("Done");
}
}
private boolean mouseHit (int x, int y)
{
// return true if mouse over button
if ((x >= 0) && (x < size ().width) &&
(y >= 0) && (y < size ().height))
{
if (linkArea != null)
return linkArea.inside (x, y);
else
return true;
}
return false;
}
public boolean mouseEnter (Event event, int x, int y)
{
// update button
updateButton (mouseHit (x, y), false, false);
return true;
}
public boolean mouseExit (Event event, int x, int y)
{
// update button
updateButton (false, false, false);
return true;
}
public boolean mouseMove (Event event, int x, int y)
{
// update button
updateButton (mouseHit (x, y), false, isMouseCapture);
return true;
}
public boolean mouseDrag (Event event, int x, int y)
{
// update button if mouse captured
if (isMouseCapture)
updateButton (mouseHit (x, y), mouseHit (x, y), true);
return true;
}
public boolean mouseDown (Event event, int x, int y)
{
// update button if mouse hit
if (mouseHit (x, y))
updateButton (true, true, true);
return true;
}
public boolean mouseUp (Event event, int x, int y)
{
// set action flag
boolean action = isMouseCapture && mouseHit (x, y);
// update button
updateButton (mouseHit (x, y), false, false);
// start timer for activation
if (action)
if (timer == null)
{
timer = new Thread (this);
timer.start ();
}
return true;
}
public void start ()
{
// start loader
if (!allLoaded)
{
loader = new Thread (this);
loader.start ();
}
}
public void stop ()
{
// stop loader
if (loader != null)
{
loader.stop ();
loader = null;
}
// stop timer
if (timer != null)
{
timer.stop ();
timer = null;
}
}
public void run ()
{
if (Thread.currentThread () == loader)
{
// load all images
MediaTracker tracker = new MediaTracker (this);
backgroundImage = loadImage (tracker, getParameter ("BackgroundImage"), 1);
if (backgroundImage != null)
repaint ();
normalImage = loadImage (tracker, getParameter ("NormalImage"), 2);
if (normalImage != null)
repaint ();
mouseOverImage = loadImage (tracker, getParameter ("MouseOverImage"), 3);
if ((normalImage == null) && (mouseOverImage != null))
repaint ();
mouseDownImage = loadImage (tracker, getParameter ("MouseDownImage"), 4);
// load audio clip
try
{
StringTokenizer tokenizer = new StringTokenizer (getParameter ("MouseDownSound"), ",");
// get the audio clip
mouseDownSound = getAudioClip (getCodeBase (), tokenizer.nextToken ().trim ());
// check for the windows bug
if (tokenizer.nextToken ().trim ().equalsIgnoreCase ("safety") &&
(System.getProperty ("os.name").equalsIgnoreCase ("Windows 95") ||
System.getProperty ("os.name").equalsIgnoreCase ("Windows 98")))
mouseDownSound = null;
}
catch (Exception exception) {}
allLoaded = true;
}
if (Thread.currentThread () == timer)
{
// wait a moment
try
{
timer.sleep (linkDelay);
}
catch (InterruptedException exception) {}
// activate the link
activateLink ();
}
}
private Image loadImage (MediaTracker tracker, String name, int identifier)
{
// load an image
if (name != null)
{
Image image = getImage (getCodeBase (), name);
tracker.addImage (image, identifier);
try
{
tracker.waitForID (identifier);
if (!tracker.isErrorID (identifier))
return image;
}
catch (InterruptedException exception) {}
}
return null;
}
private void activateLink ()
{
// clear timer
timer = null;
// handle linked applet
if (linkApplet != null)
{
Applet target = getAppletContext ().getApplet (linkApplet);
if (target != null)
target.handleEvent (new Event (this, Event.ACTION_EVENT, getParameter ("Name")));
}
// show linked document
if (linkUrl != null)
{
try
{
URL url = new URL (getCodeBase (), linkUrl);
if (linkTarget == null)
getAppletContext ().showDocument (url);
else
getAppletContext ().showDocument (url, linkTarget);
}
catch (MalformedURLException exception) {}
}
}
}
Return to index |
|
Applet Index (sorted alphabetically) A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #s |
The Java Source (applets w/source code) A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
How to Add Java Applets to Your Site
New on the Java Boutique:
New Review:
Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling
API boasts simplicity, ease-of-integration, a well-rounded feature
set, and it's free!
New Applet:
Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA
sequences into three useful formats.
Elsewhere on internet.com:
WebDeveloper Java
Lots of Java information on webdeveloper.com
WDVL Java
Thorough Java resource at the Web Developer's Virtual Library.
ScriptSearch Java
Hundreds of free Java code files to download.
jGuru: Your View of the Java Universe
Customizable portal with online training, FAQs, regular news updates, and tutorials.
Legal Notices, Licensing, Reprints, & Permissions, Privacy Policy.
