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org.apache.commons.jelly.tags.swt.ImageTag	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 java.io.InputStream;
19		import org.apache.commons.jelly.JellyTagException;
20		import org.apache.commons.jelly.TagSupport;
21		import org.apache.commons.jelly.XMLOutput;
22		import org.apache.commons.jelly.util.ClassLoaderUtils;
23		import org.eclipse.swt.graphics.Image;
24		import org.eclipse.swt.widgets.Button;
25		import org.eclipse.swt.widgets.Decorations;
26		import org.eclipse.swt.widgets.Display;
27		import org.eclipse.swt.widgets.Item;
28		import org.eclipse.swt.widgets.Label;
29		import org.eclipse.swt.widgets.Widget;
30
31		/**
32		* This creates an image on the parent Widget.
33		*
34		* @author <a href="mailto:ckl@dacelo.nl">Christiaan ten Klooster</a>
35		* @version CVS ImageTag.java,v 1.5 2004/09/07 02:41:40 dion Exp
36		*/
37	0	public class ImageTag extends TagSupport {
38
39		/** path to file */
40		private String src;
41
42		/** variable name, if specified */
43		private String var;
44
45		/** resource name, if specified */
46		private String resource;
47
48		/**
49		* Sets the resource
50		* @param resource image resource location
51		*/
52		public void setResource(String resource) {
53	0	this.resource = resource;
54	0	}
55
56		/**
57		* Obtains the resource
58		* @return the image resource
59		*/
60		public String getResource() {
61	0	return resource;
62		}
63
64		/**
65		* Sets the variable name
66		*/
67		public void setVar(String var) {
68	0	this.var = class="keyword">var;
69	0	}
70
71		/**
72		* Obtain the variable name.
73		* @return String the variable name
74		*/
75		public String getVar() {
76	0	return this.var;
77		}
78
79		/**
80		* Sets the src.
81		* @param src The src to set
82		*/
83		public void setSrc(String src) {
84	0	this.src = src;
85	0	}
86
87		/**
88		* Method getSrc.
89		* @return String
90		*/
91		public String getSrc() {
92	0	return src;
93		}
94
95		/**
96		* @return the parent widget which this widget will be added to.
97		*/
98		public Widget getParentWidget() {
99	0	WidgetTag tag = (WidgetTag) findAncestorWithClass(WidgetTag.class);
100	0	if (tag != null) {
101	0	return tag.getWidget();
102		}
103	0	return null;
104		}
105
106		// Tag interface
107		//-------------------------------------------------------------------------
108
109		/**
110		* @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput)
111		*/
112		public void doTag(XMLOutput output) throws JellyTagException {
113		// invoke by body just in case some nested tag configures me
114	0	invokeBody(output);
115
116	0	Widget parent = getParentWidget();
117
118	0	if (parent == null) {
119	0	throw new JellyTagException("This tag must be nested within a Widget or a Window");
120		}
121
122	0	Image image = null;
123
124	0	if (getSrc() != null) {
125	0	image = loadLocalImage(parent.getDisplay());
126	0	} else if (getResource() != null) {
127	0	image = loadResourceImage(parent.getDisplay());
128		} else {
129	0	throw new JellyTagException("Either an image location or a resource must be specified");
130		}
131
132	0	setWidgetImage(parent, image);
133
134		// store the image as a context variable if specified
135	0	if (var != null) {
136	0	context.setVariable(var, image);
137		}
138	0	}
139
140		/**
141		* Creates an Image, loaded from the local disk
142		*/
143		private Image loadLocalImage(Display display) {
144	0	return new Image(display, getSrc());
145		}
146
147		/**
148		* Creates an Image, loaded from a specified resource.
149		*/
150		private Image loadResourceImage(Display display) {
151	0	ClassLoader loader = ClassLoaderUtils.getClassLoader(null, getContext().getUseContextClassLoader(), getClass());
152	0	InputStream stream = loader.getResourceAsStream(getResource());
153	0	return new Image(display, stream);
154		}
155
156		/**
157		* Add image to a widget
158		* @param parent
159		* @param image
160		* @throws JellyTagException
161		*/
162		protected void setWidgetImage(Widget parent, Image image) throws JellyTagException {
163	0	if (parent instanceof Label) {
164	0	Label label = (Label) parent;
165	0	label.setImage(image);
166
167	0	} else if (parent instanceof Button) {
168	0	Button button = (Button) parent;
169	0	button.setImage(image);
170
171	0	} else if (parent instanceof Item) {
172	0	Item item = (Item) parent;
173	0	item.setImage(image);
174
175	0	} else if (parent instanceof Decorations) {
176	0	Decorations item = (Decorations) parent;
177	0	item.setImage(image);
178
179		} else {
180	0	throw new JellyTagException("This tag must be nested inside a <label>, <button>, <shell> or <item> tag");
181		}
182	0	}
183		}

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