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308 lines
8.4 KiB
Java
308 lines
8.4 KiB
Java
/* Applet.java -- Java base applet class
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.applet;
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import java.awt.Dimension;
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import java.awt.Image;
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import java.net.URL;
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import java.util.Locale;
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/**
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* This is the base applet class. An applet is a Java program that
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* runs inside a web browser or other applet viewer in a restricted
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* environment.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class Applet extends java.awt.Panel implements java.io.Serializable
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{
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// The applet stub for this applet
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private AppletStub stub;
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/**
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* Default constructor for subclasses.
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*/
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public Applet() {}
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/**
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* Returns the URL of the document this applet is embedded in.
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*
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* @return The URL of the document this applet is embedded in.
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*/
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public URL getDocumentBase()
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{
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return (stub.getDocumentBase ());
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}
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/**
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* Returns the URL of the code base for this applet.
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*
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* @return The URL of the code base for this applet.
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*/
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public URL getCodeBase()
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{
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return (stub.getCodeBase ());
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}
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/**
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* Returns the value of the specified parameter that was specified in
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* the <APPLET> tag for this applet.
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*
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* @param name The parameter name.
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*
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* @param value The parameter value, or <code>null</code> if the parameter
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* does not exist.
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*/
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public String getParameter(String name)
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{
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return (stub.getParameter (name));
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}
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/**
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* Returns the applet context for this applet.
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*
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* @return The applet context for this applet.
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*/
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public AppletContext getAppletContext()
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{
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return (stub.getAppletContext ());
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}
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/**
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* Tests whether or not this applet is currently active.
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*
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* @return <code>true</code> if this applet is active, <code>false</code>
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* otherwise.
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*/
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public boolean isActive()
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{
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return (stub.isActive ());
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}
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/**
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* Requests that the applet window for this applet be resized.
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*
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* @param width The new width in pixels.
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* @param height The new height in pixels.
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*/
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public void resize(int width, int height)
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{
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stub.appletResize (width, height);
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}
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/**
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* Requests that the applet window for this applet be resized.
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*
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* @param dim The <code>Dimension</code> object with the requested
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* width and height.
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*/
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public void resize(Dimension dim)
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{
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resize (dim.width, dim.height);
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}
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/**
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* Returns an audio clip from the specified URL.
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*
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* @param url The URL of the audio clip.
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*
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* @return The retrieved audio clip.
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*/
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public AudioClip getAudioClip(URL url)
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{
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return (getAppletContext ().getAudioClip (url));
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}
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/**
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* Returns an audio clip from the specified URL and name
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*
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* @param url The base URL of the audio clip.
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* @param name The name of the clip relative to the URL.
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*
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* @return The retrieved audio clip.
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*/
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public AudioClip getAudioClip(URL url, String name)
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{
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try
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{
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return (getAppletContext ().getAudioClip (new URL (url.toExternalForm()
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+ name)));
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}
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catch(Exception e)
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{
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return (getAudioClip (url));
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}
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}
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/**
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* Loads and plays the audio clip pointed to by the specified URL.
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*
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* @param The URL of the audio clip.
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*/
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public void play (URL url)
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{
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getAudioClip (url).play ();
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}
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/**
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* Loads and plays the audio clip pointed to by the specified URL.
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*
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* @param The base URL of the audio clip.
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* @param name The name of the audio clip relative to the URL.
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*/
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public void play (URL url, String name)
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{
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getAudioClip (url, name).play ();
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}
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/**
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* Returns an image from the specified URL. Note that the image is not
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* actually retrieved until the applet attempts to display it, so this
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* method returns immediately.
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*
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* @param url The URL of the image.
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*
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* @return The retrieved image.
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*/
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public Image getImage(URL url)
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{
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return (getAppletContext ().getImage (url));
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}
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/**
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* Returns an image from the specified URL. Note that the image is not
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* actually retrieved until the applet attempts to display it, so this
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* method returns immediately.
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*
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* @param url The base URL of the image.
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* @param name The name of the image relative to the URL.
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*
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* @return The retrieved image.
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*/
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public Image getImage(URL url, String name)
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{
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try
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{
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return (getAppletContext ().getImage (new URL (url.toExternalForm()
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+ name)));
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}
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catch(Exception e)
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{
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return (getImage (url));
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}
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}
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/**
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* Returns the locale for this applet, if it has been set. If no applet
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* specific locale has been set, the default locale is returned.
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*
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* @return The locale for this applet.
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*/
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public Locale getLocale()
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{
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return (super.getLocale ());
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}
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/**
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* Returns a descriptive string with applet defined information. The
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* implementation in this class returns <code>null</code>. Applets who
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* wish to return this information should override.
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*
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* @return A string describing the applet.
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*/
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public String getAppletInfo()
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{
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return (null);
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}
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/**
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* Returns a list of parameters this applet supports. Each element of
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* the array is a list of three strings with the name of the parameter,
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* the data type or valid values, and a description. This method is
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* optional and the default implementation returns <code>null</code>.
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*
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* @return The list of parameters supported by this applet.
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*/
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public String[][] getParameterInfo()
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{
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return (null);
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}
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/**
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* This method is called when the applet is first loaded. The default
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* implementation does nothing. Applets that wish to do one time
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* initialization should override.
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*/
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public void init() {}
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/**
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* This method is called when the applet is being unloaded. The default
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* implementation does nothing. Applets that need to clean up resources
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* on exit should override.
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*/
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public void destroy() {}
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/**
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* This method is called when the applet should start running. This is
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* normally each time a web page containing it is loaded. The default
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* implemention does nothing. Subclasses should override.
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*/
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public void start() {}
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/**
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* This method is called when the applet should stop running. This is
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* normally when the next web page is loaded. The default implementation
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* does nothing.
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*/
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public void stop() {}
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/**
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* The browser calls this method to set the applet's stub, which is the
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* low level interface to the browser.
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*
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* @param stub The applet stub for this applet.
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*/
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public final void setStub (AppletStub stub)
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{
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this.stub = stub;
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}
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} // class Applet
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