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Java > Open Source Codes > LinkArea


1 /*
2  * @(#)LinkArea.java 1.16 06/02/22
3  *
4  * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * -Redistribution of source code must retain the above copyright notice, this
10  * list of conditions and the following disclaimer.
11  *
12  * -Redistribution in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  *
16  * Neither the name of Sun Microsystems, Inc. or the names of contributors may
17  * be used to endorse or promote products derived from this software without
18  * specific prior written permission.
19  *
20  * This software is provided "AS IS," without a warranty of any kind. ALL
21  * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
22  * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
23  * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
24  * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
25  * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
26  * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
27  * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
28  * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
29  * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
30  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
31  *
32  * You acknowledge that this software is not designed, licensed or intended
33  * for use in the design, construction, operation or maintenance of any
34  * nuclear facility.
35  */
36
37 /*
38  * @(#)LinkArea.java 1.16 06/02/22
39  */
40
41 import java.awt.Graphics JavaDoc;
42 import java.net.URL JavaDoc;
43 import java.net.MalformedURLException JavaDoc;
44
45 /**
46  * The classic "Fetch a URL" ImageArea class.
47  * This class extends the basic ImageArea Class to fetch a URL when
48  * the user clicks in the area.
49  *
50  * @author Jim Graham
51  * @version 1.16, 02/22/06
52  */
53 class LinkArea extends ImageMapArea {
54     /** The URL to be fetched when the user clicks on this area. */
55     URL JavaDoc anchor;
56
57     /**
58      * The argument string is the URL to be fetched.
59      */
60     public void handleArg(String JavaDoc arg) {
61     try {
62         anchor = new URL JavaDoc(parent.getDocumentBase(), arg);
63     } catch (MalformedURLException JavaDoc e) {
64         anchor = null;
65     }
66     }
67
68     /**
69      * The isTerminal method indicates whether events should propagate
70      * to the areas underlying this one.
71      */
72     public boolean isTerminal() {
73     return true;
74     }
75
76     /**
77      * The status message area is updated to show the destination URL.
78      */
79     public void enter() {
80     showStatus((anchor != null)
81            ? "Go To " + anchor.toExternalForm()
82            : null);
83     }
84
85     /**
86      * The status message area is updated to show the destination URL.
87      */
88     public void exit() {
89     showStatus(null);
90     }
91
92     /**
93      * The new URL is fetched when the user releases the mouse button
94      * only if they are still in the area.
95      */
96     public boolean lift(int x, int y) {
97     if (inside(x, y) && anchor != null) {
98         showDocument(anchor);
99     }
100     return true;
101     }
102 }
103
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