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org.apache.commons.jelly.tags.swt.ColorTag	0%	0%

1		/*
2		* Copyright 2002,2004 The Apache Software Foundation.
3		*
4		* Licensed under the Apache License, Version 2.0 (the "License");
5		* you may not use this file except in compliance with the License.
6		* You may obtain a copy of the License at
7		*
8		* http://www.apache.org/licenses/LICENSE-2.0
9		*
10		* Unless required by applicable law or agreed to in writing, software
11		* distributed under the License is distributed on an "AS IS" BASIS,
12		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13		* See the License for the specific language governing permissions and
14		* limitations under the License.
15		*/
16		package org.apache.commons.jelly.tags.swt;
17
18		import org.apache.commons.jelly.JellyTagException;
19		import org.apache.commons.jelly.TagSupport;
20		import org.apache.commons.jelly.XMLOutput;
21		import org.apache.commons.jelly.tags.swt.converters.ColorConverter;
22		import org.eclipse.swt.graphics.Color;
23		import org.eclipse.swt.widgets.Widget;
24
25		/**
26		* Class to create a {@link Color} instance within Jelly SWT.
27		*
28		* @author <a href="mailto:crafterm@apache.org">Marcus Crafter</a>
29		* @author Written with much help thanks to the ImageTag class
30		* @version CVS $Id: ColorTag.java 155420 2005-02-26 13:06:03Z dirkv $
31		*/
32	0	public class ColorTag extends TagSupport {
33
34		/** RGB value */
35		private String rgb;
36
37		/** Variable name */
38		private String var;
39
40		/**
41		* Sets the RGB value for this {@link Color} instance
42		*
43		* @param rgb value (eg. #666666);
44		*/
45		public void setRgb(final String rgb) {
46	0	this.rgb = rgb;
47	0	}
48
49		/**
50		* Obtain the RGB value for this {@link Color} instance
51		*
52		* @return the RGB value (eg. #666666)
53		*/
54		public String getRgb() {
55	0	return this.rgb;
56		}
57
58		/**
59		* Sets the variable name
60		*
61		* @param var the variable name of this {@link Color} instance
62		*/
63		public void setVar(final String var) {
64	0	this.var = class="keyword">var;
65	0	}
66
67		/**
68		* Obtain the variable name.
69		*
70		* @return the variable name of this {@link Color} instance
71		*/
72		public String getVar() {
73	0	return this.var;
74		}
75
76		/**
77		* @return the parent widget which this widget will be added to.
78		*/
79		public Widget getParentWidget() {
80	0	final WidgetTag tag = (WidgetTag) findAncestorWithClass(WidgetTag.class);
81	0	if (tag != null) {
82	0	return tag.getWidget();
83		}
84	0	return null;
85		}
86
87		// Tag interface
88		//-------------------------------------------------------------------------
89
90		/**
91		* Creates a {@link Color} instance as defined by the RGB attribute.
92		* Stores this {@link Color} instance in the Context so that it can be
93		* referenced in the Jelly script.
94		*
95		* @param output {@link XMLOutput} reference
96		* @throws JellyTagException if an error occurs
97		* @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput)
98		*/
99		public void doTag(final XMLOutput output) throws JellyTagException {
100		// invoke by body just in case some nested tag configures me
101	0	invokeBody(output);
102
103	0	final Widget parent = getParentWidget();
104
105	0	if (parent == null) {
106	0	throw new JellyTagException(
107		"This tag must be nested within a Widget or a Window"
108		);
109		}
110
111	0	if (var == null) {
112	0	throw new JellyTagException("This tag requires a context variable name");
113		}
114
115	0	final Color color =
116		new Color(
117		parent.getDisplay(),
118		ColorConverter.getInstance().parse(getRgb())
119		);
120
121		// store the Color in the context
122	0	context.setVariable(var, color);
123	0	}
124		}

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