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Java > Open Source Codes > nextapp > echo2 > webcontainer > partialupdate > ColorUpdate


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.webcontainer.partialupdate;
31
32 import nextapp.echo2.app.Color;
33 import nextapp.echo2.app.update.ServerComponentUpdate;
34 import nextapp.echo2.webcontainer.ContainerInstance;
35 import nextapp.echo2.webcontainer.PartialUpdateParticipant;
36 import nextapp.echo2.webcontainer.RenderContext;
37 import nextapp.echo2.webcontainer.propertyrender.ColorRender;
38 import nextapp.echo2.webrender.servermessage.DomUpdate;
39
40 /**
41  * A <code>PartialUpdateParticipant</code> to update a CSS property
42  * representing a color, e.g., 'color' or 'background-color'.
43  */
44 public class ColorUpdate
45 implements PartialUpdateParticipant {
46     
47     public static final String JavaDoc CSS_BACKGROUND_COLOR = "backgroundColor";
48     public static final String JavaDoc CSS_COLOR = "color";
49     
50     private String JavaDoc componentPropertyName;
51     private String JavaDoc cssAttributeName;
52     private String JavaDoc idSuffix;
53     
54     /**
55      * Creates a new <code>ColorUpdate</code>.
56      *
57      * @param componentPropertyName the name of the property of the component
58      * @param idSuffix the suffix to append to the root client-side identifier
59      * of the component (should be null in typical case of no suffix)
60      * @param cssAttributeName the name of the CSS attribute to update (see
61      * CSS constants provided in this class)
62      */
63     public ColorUpdate(String JavaDoc componentPropertyName, String JavaDoc idSuffix, String JavaDoc cssAttributeName) {
64         super();
65         this.componentPropertyName = componentPropertyName;
66         this.idSuffix = idSuffix;
67         this.cssAttributeName = cssAttributeName;
68     }
69
70     /**
71      * @see nextapp.echo2.webcontainer.PartialUpdateParticipant#canRenderProperty(nextapp.echo2.webcontainer.RenderContext,
72      * nextapp.echo2.app.update.ServerComponentUpdate)
73      */
74     public boolean canRenderProperty(RenderContext rc, ServerComponentUpdate update) {
75         return true;
76     }
77
78     /**
79      * @see nextapp.echo2.webcontainer.PartialUpdateParticipant#renderProperty(
80      * nextapp.echo2.webcontainer.RenderContext, nextapp.echo2.app.update.ServerComponentUpdate)
81      */
82     public void renderProperty(RenderContext rc, ServerComponentUpdate update) {
83         Color color = (Color) update.getParent().getRenderProperty(componentPropertyName);
84         String JavaDoc elementId = idSuffix == null ? ContainerInstance.getElementId(update.getParent())
85                 : ContainerInstance.getElementId(update.getParent()) + idSuffix;
86         if (color == null) {
87             DomUpdate.renderStyleUpdate(rc.getServerMessage(), elementId, cssAttributeName, "");
88         } else {
89             DomUpdate.renderStyleUpdate(rc.getServerMessage(), elementId, cssAttributeName,
90                     ColorRender.renderCssAttributeValue(color));
91         }
92     }
93 }
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