author | prr |
Sat, 19 Sep 2015 15:45:59 -0700 | |
changeset 32865 | f9cb6e427f9e |
parent 25859 | 3317bb8137f4 |
child 35667 | ed476aba94de |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright (c) 1995, 2014, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
|
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.applet; |
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import java.awt.*; |
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import java.awt.image.ColorModel; |
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import java.io.IOException; |
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import java.io.ObjectInputStream; |
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import java.net.URL; |
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import java.net.MalformedURLException; |
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import java.util.Hashtable; |
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import java.util.Locale; |
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import javax.accessibility.*; |
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/** |
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* An applet is a small program that is intended not to be run on |
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* its own, but rather to be embedded inside another application. |
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* <p> |
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* The <code>Applet</code> class must be the superclass of any |
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* applet that is to be embedded in a Web page or viewed by the Java |
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* Applet Viewer. The <code>Applet</code> class provides a standard |
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* interface between applets and their environment. |
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* |
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* @author Arthur van Hoff |
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* @author Chris Warth |
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* @since 1.0 |
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*/ |
50 |
public class Applet extends Panel { |
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51 |
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52 |
/** |
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53 |
* Constructs a new Applet. |
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54 |
* <p> |
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55 |
* Note: Many methods in <code>java.applet.Applet</code> |
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56 |
* may be invoked by the applet only after the applet is |
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* fully constructed; applet should avoid calling methods |
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58 |
* in <code>java.applet.Applet</code> in the constructor. |
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* |
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60 |
* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
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* returns true. |
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* @see java.awt.GraphicsEnvironment#isHeadless |
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* @since 1.4 |
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*/ |
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public Applet() throws HeadlessException { |
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66 |
if (GraphicsEnvironment.isHeadless()) { |
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throw new HeadlessException(); |
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68 |
} |
|
69 |
} |
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70 |
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71 |
/** |
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72 |
* Applets can be serialized but the following conventions MUST be followed: |
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73 |
* |
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74 |
* Before Serialization: |
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75 |
* An applet must be in STOPPED state. |
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* |
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77 |
* After Deserialization: |
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* The applet will be restored in STOPPED state (and most clients will |
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* likely move it into RUNNING state). |
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80 |
* The stub field will be restored by the reader. |
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81 |
*/ |
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private transient AppletStub stub; |
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/* version ID for serialized form. */ |
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private static final long serialVersionUID = -5836846270535785031L; |
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/** |
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* Read an applet from an object input stream. |
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* @param s an object input stream. |
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* @exception HeadlessException if |
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* <code>GraphicsEnvironment.isHeadless()</code> returns |
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* <code>true</code> |
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* @serial |
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* @see java.awt.GraphicsEnvironment#isHeadless |
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* @since 1.4 |
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96 |
*/ |
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private void readObject(ObjectInputStream s) |
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throws ClassNotFoundException, IOException, HeadlessException { |
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if (GraphicsEnvironment.isHeadless()) { |
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throw new HeadlessException(); |
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} |
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s.defaultReadObject(); |
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} |
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105 |
/** |
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* Sets this applet's stub. This is done automatically by the system. |
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* <p>If there is a security manager, its <code> checkPermission </code> |
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* method is called with the |
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109 |
* <code>AWTPermission("setAppletStub")</code> |
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* permission if a stub has already been set. |
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* @param stub the new stub. |
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* @exception SecurityException if the caller cannot set the stub |
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113 |
*/ |
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114 |
public final void setStub(AppletStub stub) { |
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115 |
if (this.stub != null) { |
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116 |
SecurityManager s = System.getSecurityManager(); |
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117 |
if (s != null) { |
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118 |
s.checkPermission(new AWTPermission("setAppletStub")); |
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119 |
} |
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120 |
} |
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11137 | 121 |
this.stub = stub; |
2 | 122 |
} |
123 |
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124 |
/** |
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125 |
* Determines if this applet is active. An applet is marked active |
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* just before its <code>start</code> method is called. It becomes |
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* inactive just before its <code>stop</code> method is called. |
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* |
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129 |
* @return <code>true</code> if the applet is active; |
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* <code>false</code> otherwise. |
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* @see java.applet.Applet#start() |
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132 |
* @see java.applet.Applet#stop() |
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133 |
*/ |
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134 |
public boolean isActive() { |
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135 |
if (stub != null) { |
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return stub.isActive(); |
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} else { // If stub field not filled in, applet never active |
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return false; |
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139 |
} |
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140 |
} |
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141 |
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142 |
/** |
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* Gets the URL of the document in which this applet is embedded. |
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* For example, suppose an applet is contained |
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* within the document: |
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* <blockquote><pre> |
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* http://www.oracle.com/technetwork/java/index.html |
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* </pre></blockquote> |
149 |
* The document base is: |
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* <blockquote><pre> |
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* http://www.oracle.com/technetwork/java/index.html |
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* </pre></blockquote> |
153 |
* |
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154 |
* @return the {@link java.net.URL} of the document that contains this |
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* applet. |
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156 |
* @see java.applet.Applet#getCodeBase() |
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157 |
*/ |
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158 |
public URL getDocumentBase() { |
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159 |
return stub.getDocumentBase(); |
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160 |
} |
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162 |
/** |
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* Gets the base URL. This is the URL of the directory which contains this applet. |
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* |
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* @return the base {@link java.net.URL} of |
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* the directory which contains this applet. |
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* @see java.applet.Applet#getDocumentBase() |
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168 |
*/ |
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169 |
public URL getCodeBase() { |
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170 |
return stub.getCodeBase(); |
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171 |
} |
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172 |
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/** |
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174 |
* Returns the value of the named parameter in the HTML tag. For |
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175 |
* example, if this applet is specified as |
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* <blockquote><pre> |
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* <applet code="Clock" width=50 height=50> |
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* <param name=Color value="blue"> |
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* </applet> |
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* </pre></blockquote> |
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181 |
* <p> |
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* then a call to <code>getParameter("Color")</code> returns the |
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* value <code>"blue"</code>. |
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* <p> |
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185 |
* The <code>name</code> argument is case insensitive. |
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* |
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187 |
* @param name a parameter name. |
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188 |
* @return the value of the named parameter, |
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189 |
* or <code>null</code> if not set. |
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190 |
*/ |
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191 |
public String getParameter(String name) { |
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192 |
return stub.getParameter(name); |
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} |
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194 |
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195 |
/** |
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196 |
* Determines this applet's context, which allows the applet to |
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* query and affect the environment in which it runs. |
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198 |
* <p> |
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199 |
* This environment of an applet represents the document that |
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* contains the applet. |
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* |
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* @return the applet's context. |
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203 |
*/ |
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204 |
public AppletContext getAppletContext() { |
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205 |
return stub.getAppletContext(); |
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206 |
} |
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207 |
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208 |
/** |
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209 |
* Requests that this applet be resized. |
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210 |
* |
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211 |
* @param width the new requested width for the applet. |
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212 |
* @param height the new requested height for the applet. |
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213 |
*/ |
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11137 | 214 |
@SuppressWarnings("deprecation") |
2 | 215 |
public void resize(int width, int height) { |
216 |
Dimension d = size(); |
|
217 |
if ((d.width != width) || (d.height != height)) { |
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218 |
super.resize(width, height); |
|
219 |
if (stub != null) { |
|
220 |
stub.appletResize(width, height); |
|
221 |
} |
|
222 |
} |
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223 |
} |
|
224 |
||
225 |
/** |
|
226 |
* Requests that this applet be resized. |
|
227 |
* |
|
228 |
* @param d an object giving the new width and height. |
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229 |
*/ |
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11137 | 230 |
@SuppressWarnings("deprecation") |
2 | 231 |
public void resize(Dimension d) { |
232 |
resize(d.width, d.height); |
|
233 |
} |
|
234 |
||
235 |
/** |
|
4261 | 236 |
* Indicates if this container is a validate root. |
237 |
* <p> |
|
238 |
* {@code Applet} objects are the validate roots, and, therefore, they |
|
239 |
* override this method to return {@code true}. |
|
240 |
* |
|
241 |
* @return {@code true} |
|
242 |
* @since 1.7 |
|
243 |
* @see java.awt.Container#isValidateRoot |
|
244 |
*/ |
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245 |
@Override |
|
246 |
public boolean isValidateRoot() { |
|
247 |
return true; |
|
248 |
} |
|
249 |
||
250 |
/** |
|
2 | 251 |
* Requests that the argument string be displayed in the |
252 |
* "status window". Many browsers and applet viewers |
|
253 |
* provide such a window, where the application can inform users of |
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254 |
* its current state. |
|
255 |
* |
|
256 |
* @param msg a string to display in the status window. |
|
257 |
*/ |
|
258 |
public void showStatus(String msg) { |
|
259 |
getAppletContext().showStatus(msg); |
|
260 |
} |
|
261 |
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262 |
/** |
|
263 |
* Returns an <code>Image</code> object that can then be painted on |
|
264 |
* the screen. The <code>url</code> that is passed as an argument |
|
265 |
* must specify an absolute URL. |
|
266 |
* <p> |
|
267 |
* This method always returns immediately, whether or not the image |
|
268 |
* exists. When this applet attempts to draw the image on the screen, |
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269 |
* the data will be loaded. The graphics primitives that draw the |
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270 |
* image will incrementally paint on the screen. |
|
271 |
* |
|
272 |
* @param url an absolute URL giving the location of the image. |
|
273 |
* @return the image at the specified URL. |
|
274 |
* @see java.awt.Image |
|
275 |
*/ |
|
276 |
public Image getImage(URL url) { |
|
277 |
return getAppletContext().getImage(url); |
|
278 |
} |
|
279 |
||
280 |
/** |
|
281 |
* Returns an <code>Image</code> object that can then be painted on |
|
282 |
* the screen. The <code>url</code> argument must specify an absolute |
|
283 |
* URL. The <code>name</code> argument is a specifier that is |
|
284 |
* relative to the <code>url</code> argument. |
|
285 |
* <p> |
|
286 |
* This method always returns immediately, whether or not the image |
|
287 |
* exists. When this applet attempts to draw the image on the screen, |
|
288 |
* the data will be loaded. The graphics primitives that draw the |
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289 |
* image will incrementally paint on the screen. |
|
290 |
* |
|
291 |
* @param url an absolute URL giving the base location of the image. |
|
292 |
* @param name the location of the image, relative to the |
|
293 |
* <code>url</code> argument. |
|
294 |
* @return the image at the specified URL. |
|
295 |
* @see java.awt.Image |
|
296 |
*/ |
|
297 |
public Image getImage(URL url, String name) { |
|
298 |
try { |
|
299 |
return getImage(new URL(url, name)); |
|
300 |
} catch (MalformedURLException e) { |
|
301 |
return null; |
|
302 |
} |
|
303 |
} |
|
304 |
||
305 |
/** |
|
306 |
* Get an audio clip from the given URL. |
|
307 |
* |
|
308 |
* @param url points to the audio clip |
|
309 |
* @return the audio clip at the specified URL. |
|
310 |
* |
|
311 |
* @since 1.2 |
|
312 |
*/ |
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public static final AudioClip newAudioClip(URL url) { |
2 | 314 |
return new sun.applet.AppletAudioClip(url); |
315 |
} |
|
316 |
||
317 |
/** |
|
318 |
* Returns the <code>AudioClip</code> object specified by the |
|
319 |
* <code>URL</code> argument. |
|
320 |
* <p> |
|
321 |
* This method always returns immediately, whether or not the audio |
|
322 |
* clip exists. When this applet attempts to play the audio clip, the |
|
323 |
* data will be loaded. |
|
324 |
* |
|
325 |
* @param url an absolute URL giving the location of the audio clip. |
|
326 |
* @return the audio clip at the specified URL. |
|
327 |
* @see java.applet.AudioClip |
|
328 |
*/ |
|
329 |
public AudioClip getAudioClip(URL url) { |
|
330 |
return getAppletContext().getAudioClip(url); |
|
331 |
} |
|
332 |
||
333 |
/** |
|
334 |
* Returns the <code>AudioClip</code> object specified by the |
|
335 |
* <code>URL</code> and <code>name</code> arguments. |
|
336 |
* <p> |
|
337 |
* This method always returns immediately, whether or not the audio |
|
338 |
* clip exists. When this applet attempts to play the audio clip, the |
|
339 |
* data will be loaded. |
|
340 |
* |
|
341 |
* @param url an absolute URL giving the base location of the |
|
342 |
* audio clip. |
|
343 |
* @param name the location of the audio clip, relative to the |
|
344 |
* <code>url</code> argument. |
|
345 |
* @return the audio clip at the specified URL. |
|
346 |
* @see java.applet.AudioClip |
|
347 |
*/ |
|
348 |
public AudioClip getAudioClip(URL url, String name) { |
|
349 |
try { |
|
350 |
return getAudioClip(new URL(url, name)); |
|
351 |
} catch (MalformedURLException e) { |
|
352 |
return null; |
|
353 |
} |
|
354 |
} |
|
355 |
||
356 |
/** |
|
357 |
* Returns information about this applet. An applet should override |
|
358 |
* this method to return a <code>String</code> containing information |
|
359 |
* about the author, version, and copyright of the applet. |
|
360 |
* <p> |
|
361 |
* The implementation of this method provided by the |
|
362 |
* <code>Applet</code> class returns <code>null</code>. |
|
363 |
* |
|
364 |
* @return a string containing information about the author, version, and |
|
365 |
* copyright of the applet. |
|
366 |
*/ |
|
367 |
public String getAppletInfo() { |
|
368 |
return null; |
|
369 |
} |
|
370 |
||
371 |
/** |
|
372 |
* Gets the locale of the applet. It allows the applet |
|
373 |
* to maintain its own locale separated from the locale |
|
374 |
* of the browser or appletviewer. |
|
375 |
* |
|
376 |
* @return the locale of the applet; if no locale has |
|
377 |
* been set, the default locale is returned. |
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378 |
* @since 1.1 |
2 | 379 |
*/ |
380 |
public Locale getLocale() { |
|
381 |
Locale locale = super.getLocale(); |
|
382 |
if (locale == null) { |
|
383 |
return Locale.getDefault(); |
|
384 |
} |
|
385 |
return locale; |
|
386 |
} |
|
387 |
||
388 |
/** |
|
389 |
* Returns information about the parameters that are understood by |
|
390 |
* this applet. An applet should override this method to return an |
|
391 |
* array of <code>Strings</code> describing these parameters. |
|
392 |
* <p> |
|
393 |
* Each element of the array should be a set of three |
|
394 |
* <code>Strings</code> containing the name, the type, and a |
|
395 |
* description. For example: |
|
21957 | 396 |
* <blockquote><pre> |
2 | 397 |
* String pinfo[][] = { |
398 |
* {"fps", "1-10", "frames per second"}, |
|
399 |
* {"repeat", "boolean", "repeat image loop"}, |
|
400 |
* {"imgs", "url", "images directory"} |
|
401 |
* }; |
|
402 |
* </pre></blockquote> |
|
403 |
* <p> |
|
404 |
* The implementation of this method provided by the |
|
405 |
* <code>Applet</code> class returns <code>null</code>. |
|
406 |
* |
|
407 |
* @return an array describing the parameters this applet looks for. |
|
408 |
*/ |
|
409 |
public String[][] getParameterInfo() { |
|
410 |
return null; |
|
411 |
} |
|
412 |
||
413 |
/** |
|
414 |
* Plays the audio clip at the specified absolute URL. Nothing |
|
415 |
* happens if the audio clip cannot be found. |
|
416 |
* |
|
417 |
* @param url an absolute URL giving the location of the audio clip. |
|
418 |
*/ |
|
419 |
public void play(URL url) { |
|
420 |
AudioClip clip = getAudioClip(url); |
|
421 |
if (clip != null) { |
|
422 |
clip.play(); |
|
423 |
} |
|
424 |
} |
|
425 |
||
426 |
/** |
|
427 |
* Plays the audio clip given the URL and a specifier that is |
|
428 |
* relative to it. Nothing happens if the audio clip cannot be found. |
|
429 |
* |
|
430 |
* @param url an absolute URL giving the base location of the |
|
431 |
* audio clip. |
|
432 |
* @param name the location of the audio clip, relative to the |
|
433 |
* <code>url</code> argument. |
|
434 |
*/ |
|
435 |
public void play(URL url, String name) { |
|
436 |
AudioClip clip = getAudioClip(url, name); |
|
437 |
if (clip != null) { |
|
438 |
clip.play(); |
|
439 |
} |
|
440 |
} |
|
441 |
||
442 |
/** |
|
443 |
* Called by the browser or applet viewer to inform |
|
444 |
* this applet that it has been loaded into the system. It is always |
|
445 |
* called before the first time that the <code>start</code> method is |
|
446 |
* called. |
|
447 |
* <p> |
|
448 |
* A subclass of <code>Applet</code> should override this method if |
|
449 |
* it has initialization to perform. For example, an applet with |
|
450 |
* threads would use the <code>init</code> method to create the |
|
451 |
* threads and the <code>destroy</code> method to kill them. |
|
452 |
* <p> |
|
453 |
* The implementation of this method provided by the |
|
454 |
* <code>Applet</code> class does nothing. |
|
455 |
* |
|
456 |
* @see java.applet.Applet#destroy() |
|
457 |
* @see java.applet.Applet#start() |
|
458 |
* @see java.applet.Applet#stop() |
|
459 |
*/ |
|
460 |
public void init() { |
|
461 |
} |
|
462 |
||
463 |
/** |
|
464 |
* Called by the browser or applet viewer to inform |
|
465 |
* this applet that it should start its execution. It is called after |
|
466 |
* the <code>init</code> method and each time the applet is revisited |
|
467 |
* in a Web page. |
|
468 |
* <p> |
|
469 |
* A subclass of <code>Applet</code> should override this method if |
|
470 |
* it has any operation that it wants to perform each time the Web |
|
471 |
* page containing it is visited. For example, an applet with |
|
472 |
* animation might want to use the <code>start</code> method to |
|
473 |
* resume animation, and the <code>stop</code> method to suspend the |
|
474 |
* animation. |
|
475 |
* <p> |
|
476 |
* Note: some methods, such as <code>getLocationOnScreen</code>, can only |
|
477 |
* provide meaningful results if the applet is showing. Because |
|
478 |
* <code>isShowing</code> returns <code>false</code> when the applet's |
|
479 |
* <code>start</code> is first called, methods requiring |
|
480 |
* <code>isShowing</code> to return <code>true</code> should be called from |
|
481 |
* a <code>ComponentListener</code>. |
|
482 |
* <p> |
|
483 |
* The implementation of this method provided by the |
|
484 |
* <code>Applet</code> class does nothing. |
|
485 |
* |
|
486 |
* @see java.applet.Applet#destroy() |
|
487 |
* @see java.applet.Applet#init() |
|
488 |
* @see java.applet.Applet#stop() |
|
489 |
* @see java.awt.Component#isShowing() |
|
490 |
* @see java.awt.event.ComponentListener#componentShown(java.awt.event.ComponentEvent) |
|
491 |
*/ |
|
492 |
public void start() { |
|
493 |
} |
|
494 |
||
495 |
/** |
|
496 |
* Called by the browser or applet viewer to inform |
|
497 |
* this applet that it should stop its execution. It is called when |
|
498 |
* the Web page that contains this applet has been replaced by |
|
499 |
* another page, and also just before the applet is to be destroyed. |
|
500 |
* <p> |
|
501 |
* A subclass of <code>Applet</code> should override this method if |
|
502 |
* it has any operation that it wants to perform each time the Web |
|
503 |
* page containing it is no longer visible. For example, an applet |
|
504 |
* with animation might want to use the <code>start</code> method to |
|
505 |
* resume animation, and the <code>stop</code> method to suspend the |
|
506 |
* animation. |
|
507 |
* <p> |
|
508 |
* The implementation of this method provided by the |
|
509 |
* <code>Applet</code> class does nothing. |
|
510 |
* |
|
511 |
* @see java.applet.Applet#destroy() |
|
512 |
* @see java.applet.Applet#init() |
|
513 |
*/ |
|
514 |
public void stop() { |
|
515 |
} |
|
516 |
||
517 |
/** |
|
518 |
* Called by the browser or applet viewer to inform |
|
519 |
* this applet that it is being reclaimed and that it should destroy |
|
520 |
* any resources that it has allocated. The <code>stop</code> method |
|
521 |
* will always be called before <code>destroy</code>. |
|
522 |
* <p> |
|
523 |
* A subclass of <code>Applet</code> should override this method if |
|
524 |
* it has any operation that it wants to perform before it is |
|
525 |
* destroyed. For example, an applet with threads would use the |
|
526 |
* <code>init</code> method to create the threads and the |
|
527 |
* <code>destroy</code> method to kill them. |
|
528 |
* <p> |
|
529 |
* The implementation of this method provided by the |
|
530 |
* <code>Applet</code> class does nothing. |
|
531 |
* |
|
532 |
* @see java.applet.Applet#init() |
|
533 |
* @see java.applet.Applet#start() |
|
534 |
* @see java.applet.Applet#stop() |
|
535 |
*/ |
|
536 |
public void destroy() { |
|
537 |
} |
|
538 |
||
539 |
// |
|
540 |
// Accessibility support |
|
541 |
// |
|
542 |
||
543 |
AccessibleContext accessibleContext = null; |
|
544 |
||
545 |
/** |
|
546 |
* Gets the AccessibleContext associated with this Applet. |
|
547 |
* For applets, the AccessibleContext takes the form of an |
|
548 |
* AccessibleApplet. |
|
549 |
* A new AccessibleApplet instance is created if necessary. |
|
550 |
* |
|
551 |
* @return an AccessibleApplet that serves as the |
|
552 |
* AccessibleContext of this Applet |
|
553 |
* @since 1.3 |
|
554 |
*/ |
|
555 |
public AccessibleContext getAccessibleContext() { |
|
556 |
if (accessibleContext == null) { |
|
557 |
accessibleContext = new AccessibleApplet(); |
|
558 |
} |
|
559 |
return accessibleContext; |
|
560 |
} |
|
561 |
||
562 |
/** |
|
563 |
* This class implements accessibility support for the |
|
564 |
* <code>Applet</code> class. It provides an implementation of the |
|
565 |
* Java Accessibility API appropriate to applet user-interface elements. |
|
566 |
* @since 1.3 |
|
567 |
*/ |
|
568 |
protected class AccessibleApplet extends AccessibleAWTPanel { |
|
569 |
||
570 |
private static final long serialVersionUID = 8127374778187708896L; |
|
571 |
||
572 |
/** |
|
573 |
* Get the role of this object. |
|
574 |
* |
|
575 |
* @return an instance of AccessibleRole describing the role of the |
|
576 |
* object |
|
577 |
*/ |
|
578 |
public AccessibleRole getAccessibleRole() { |
|
579 |
return AccessibleRole.FRAME; |
|
580 |
} |
|
581 |
||
582 |
/** |
|
583 |
* Get the state of this object. |
|
584 |
* |
|
585 |
* @return an instance of AccessibleStateSet containing the current |
|
586 |
* state set of the object |
|
587 |
* @see AccessibleState |
|
588 |
*/ |
|
589 |
public AccessibleStateSet getAccessibleStateSet() { |
|
590 |
AccessibleStateSet states = super.getAccessibleStateSet(); |
|
591 |
states.add(AccessibleState.ACTIVE); |
|
592 |
return states; |
|
593 |
} |
|
594 |
||
595 |
} |
|
596 |
} |