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Java > Open Source Codes > nextapp > echo2 > webcontainer > propertyrender > ColorRender


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.propertyrender;
31
32 import nextapp.echo2.app.Color;
33 import nextapp.echo2.app.Component;
34 import nextapp.echo2.webrender.output.CssStyle;
35
36 /**
37  * Utility class for rendering <code>nextapp.echo2.app.Color</code>
38  * properties to CSS.
39  */
40 public class ColorRender {
41
42     private static final String JavaDoc COLOR_MASK = "#000000";
43
44     /**
45      * Renders foreground and background <code>Color</code> properties
46      * to the given CSS style. Null property values are ignored.
47      *
48      * @param cssStyle the target <code>CssStyle</code>
49      * @param foreground the foreground color
50      * @param background the background color
51      */
52     public static void renderToStyle(CssStyle cssStyle, Color foreground, Color background) {
53         if (foreground != null) {
54             cssStyle.setAttribute("color", renderCssAttributeValue(foreground));
55         }
56         if (background != null) {
57             cssStyle.setAttribute("background-color", renderCssAttributeValue(background));
58         }
59     }
60     
61     /**
62      * Renders the foreground and background <code>Color</code> properties
63      * of the provided <code>Component</code> to a CSS style.
64      *
65      * @param cssStyle the target <code>CssStyle</code>
66      * @param component the component
67      */
68     public static void renderToStyle(CssStyle cssStyle, Component component) {
69         renderToStyle(cssStyle, (Color) component.getRenderProperty(Component.PROPERTY_FOREGROUND),
70                 (Color) component.getRenderProperty(Component.PROPERTY_BACKGROUND));
71     }
72     
73     /**
74      * Renders a <code>Color</code> property value to a CSS color attribute
75      * value.
76      *
77      * @param color the property value
78      * @return the CSS attribute value
79      */
80     public static final String JavaDoc renderCssAttributeValue(Color color) {
81         if (color == null) {
82             return "";
83         }
84         int rgb = color.getRgb();
85         String JavaDoc colorString = Integer.toString(rgb, 16);
86         return COLOR_MASK.substring(0, 7 - colorString.length()) + colorString;
87     }
88     
89     /** Non-instantiable class. */
90     private ColorRender() { }
91 }
92
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