View Javadoc

1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.myfaces.tobago.renderkit.html.scarborough.standard.tag;
21  
22  import org.apache.myfaces.tobago.component.Attributes;
23  import org.apache.myfaces.tobago.component.UICommand;
24  import org.apache.myfaces.tobago.context.ResourceManagerUtils;
25  import org.apache.myfaces.tobago.internal.component.AbstractUIImage;
26  import org.apache.myfaces.tobago.renderkit.LayoutComponentRendererBase;
27  import org.apache.myfaces.tobago.renderkit.css.Classes;
28  import org.apache.myfaces.tobago.renderkit.css.Style;
29  import org.apache.myfaces.tobago.renderkit.html.HtmlAttributes;
30  import org.apache.myfaces.tobago.renderkit.html.HtmlElements;
31  import org.apache.myfaces.tobago.renderkit.html.util.HtmlRendererUtils;
32  import org.apache.myfaces.tobago.webapp.TobagoResponseWriter;
33  import org.slf4j.Logger;
34  import org.slf4j.LoggerFactory;
35  
36  import javax.faces.component.UIComponent;
37  import javax.faces.context.FacesContext;
38  import java.io.IOException;
39  
40  public class ImageRenderer extends LayoutComponentRendererBase {
41  
42    private static final Logger LOG = LoggerFactory.getLogger(ImageRenderer.class);
43  
44    public void prepareRender(FacesContext facesContext, UIComponent component) throws IOException {
45      super.prepareRender(facesContext, component);
46      HtmlRendererUtils.renderDojoDndSource(facesContext, component);
47    }
48  
49    public void encodeEnd(FacesContext facesContext, UIComponent component) throws IOException {
50  
51      TobagoResponseWriter writer = HtmlRendererUtils.getTobagoResponseWriter(facesContext);
52  
53      AbstractUIImage image = (AbstractUIImage) component;
54      final String value = image.getUrl();
55      String src = value;
56      if (src != null) {
57        if (ResourceManagerUtils.isAbsoluteResource(src)) {
58          // absolute Path to image : nothing to do
59        } else {
60          src = null;
61          if (isDisabled(image)) {
62            src = ResourceManagerUtils.getImageWithPath(facesContext,
63                HtmlRendererUtils.createSrc(value, "Disabled"), true);
64          }
65          if (src == null) {
66            src = ResourceManagerUtils.getImageWithPath(facesContext, value);
67          }
68        }
69      }
70  
71      String border = (String) image.getAttributes().get(Attributes.BORDER);
72      if (border == null) {
73        border = "0";
74      }
75      String alt = (String) image.getAttributes().get(Attributes.ALT);
76      if (alt == null) {
77        alt = "";
78      }
79  
80      writer.startElement(HtmlElements.IMG, image);
81      final String clientId = image.getClientId(facesContext);
82      writer.writeIdAttribute(clientId);
83      HtmlRendererUtils.writeDataAttributes(facesContext, writer, image);
84      if (src != null) {
85        writer.writeAttribute(HtmlAttributes.SRC, src, true);
86      }
87      writer.writeAttribute(HtmlAttributes.ALT, alt, true);
88      HtmlRendererUtils.renderTip(image, writer);
89      writer.writeAttribute(HtmlAttributes.BORDER, border, false);
90      Style style = new Style(facesContext, image);
91      writer.writeStyleAttribute(style);
92      HtmlRendererUtils.renderDojoDndItem(image, writer, true);
93      writer.writeClassAttribute(Classes.create(image));
94      writer.endElement(HtmlElements.IMG);
95    }
96  
97    private String createSrc(String src, String ext) {
98      int dot = src.lastIndexOf('.');
99      if (dot == -1) {
100       LOG.warn("Image src without extension: '" + src + "'");
101       return src;
102     } else {
103       return src.substring(0, dot) + ext + src.substring(dot);
104     }
105   }
106 
107   private boolean isDisabled(AbstractUIImage graphic) {
108     return graphic.isDisabled() 
109         || (graphic.getParent() instanceof UICommand && ((UICommand) graphic.getParent()).isDisabled());
110   }
111 }