001: /*
002: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
003: * Copyright (C) 2002-2005 NextApp, Inc.
004: *
005: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
006: *
007: * The contents of this file are subject to the Mozilla Public License Version
008: * 1.1 (the "License"); you may not use this file except in compliance with
009: * the License. You may obtain a copy of the License at
010: * http://www.mozilla.org/MPL/
011: *
012: * Software distributed under the License is distributed on an "AS IS" basis,
013: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
014: * for the specific language governing rights and limitations under the
015: * License.
016: *
017: * Alternatively, the contents of this file may be used under the terms of
018: * either the GNU General Public License Version 2 or later (the "GPL"), or
019: * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
020: * in which case the provisions of the GPL or the LGPL are applicable instead
021: * of those above. If you wish to allow use of your version of this file only
022: * under the terms of either the GPL or the LGPL, and not to allow others to
023: * use your version of this file under the terms of the MPL, indicate your
024: * decision by deleting the provisions above and replace them with the notice
025: * and other provisions required by the GPL or the LGPL. If you do not delete
026: * the provisions above, a recipient may use your version of this file under
027: * the terms of any one of the MPL, the GPL or the LGPL.
028: */
029:
030: package nextapp.echo2.webcontainer.propertyrender;
031:
032: import nextapp.echo2.app.Color;
033: import nextapp.echo2.app.Component;
034: import nextapp.echo2.webrender.output.CssStyle;
035:
036: /**
037: * Utility class for rendering <code>nextapp.echo2.app.Color</code>
038: * properties to CSS.
039: */
040: public class ColorRender {
041:
042: private static final String COLOR_MASK = "#000000";
043:
044: /**
045: * Renders foreground and background <code>Color</code> properties
046: * to the given CSS style. Null property values are ignored.
047: *
048: * @param cssStyle the target <code>CssStyle</code>
049: * @param foreground the foreground color
050: * @param background the background color
051: */
052: public static void renderToStyle(CssStyle cssStyle,
053: Color foreground, Color background) {
054: if (foreground != null) {
055: cssStyle.setAttribute("color",
056: renderCssAttributeValue(foreground));
057: }
058: if (background != null) {
059: cssStyle.setAttribute("background-color",
060: renderCssAttributeValue(background));
061: }
062: }
063:
064: /**
065: * Renders the foreground and background <code>Color</code> properties
066: * of the provided <code>Component</code> to a CSS style.
067: *
068: * @param cssStyle the target <code>CssStyle</code>
069: * @param component the component
070: */
071: public static void renderToStyle(CssStyle cssStyle,
072: Component component) {
073: renderToStyle(
074: cssStyle,
075: (Color) component
076: .getRenderProperty(Component.PROPERTY_FOREGROUND),
077: (Color) component
078: .getRenderProperty(Component.PROPERTY_BACKGROUND));
079: }
080:
081: /**
082: * Renders a <code>Color</code> property value to a CSS color attribute
083: * value.
084: *
085: * @param color the property value
086: * @return the CSS attribute value
087: */
088: public static final String renderCssAttributeValue(Color color) {
089: if (color == null) {
090: return "";
091: }
092: int rgb = color.getRgb();
093: String colorString = Integer.toString(rgb, 16);
094: return COLOR_MASK.substring(0, 7 - colorString.length())
095: + colorString;
096: }
097:
098: /** Non-instantiable class. */
099: private ColorRender() {
100: }
101: }
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