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1
16 package org.apache.myfaces.renderkit.html;
17
18 import org.apache.myfaces.renderkit.JSFAttr;
19 import org.apache.myfaces.renderkit.RendererUtils;
20 import org.apache.myfaces.util.ArrayUtils;
21 import org.apache.myfaces.util.StringUtils;
22
23 import org.apache.commons.logging.Log;
24 import org.apache.commons.logging.LogFactory;
25
26 import javax.faces.component.UIComponent;
27 import javax.faces.component.UIPanel;
28 import javax.faces.component.html.HtmlPanelGrid;
29 import javax.faces.context.FacesContext;
30 import javax.faces.context.ResponseWriter;
31 import java.io.IOException  ;
32 import java.util.Iterator ;
33
34
75 public class HtmlGridRenderer
76 extends HtmlRenderer
77 {
78 private static final Log log = LogFactory.getLog(HtmlGridRenderer.class);
79
80 public boolean getRendersChildren()
81 {
82 return true;
83 }
84
85 public void encodeBegin(FacesContext facesContext, UIComponent component)
86 throws IOException
87 {
88 }
90
91 public void encodeChildren(FacesContext context, UIComponent component)
92 throws IOException
93 {
94 }
96
97 public void encodeEnd(FacesContext facesContext, UIComponent component)
98 throws IOException
99 {
100 RendererUtils.checkParamValidity(facesContext, component, UIPanel.class);
101
102 int columns;
103 if (component instanceof HtmlPanelGrid)
104 {
105 columns = ((HtmlPanelGrid)component).getColumns();
106 }
107 else
108 {
109 Integer i = (Integer )component.getAttributes().get(JSFAttr.COLUMNS_ATTR);
110 columns = i != null ? i.intValue() : 0;
111 }
112
113 if (columns <= 0)
114 {
115 if (log.isErrorEnabled())
116 {
117 log.error("Wrong columns attribute for PanelGrid " + component.getClientId(facesContext) + ": " + columns);
118 }
119 columns = 1;
120 }
121
122 ResponseWriter writer = facesContext.getResponseWriter();
123 writer.startElement(HTML.TABLE_ELEM, component);
124 HtmlRendererUtils.writeIdIfNecessary(writer, component, facesContext);
125 HtmlRendererUtils.renderHTMLAttributes(writer, component, HTML.TABLE_PASSTHROUGH_ATTRIBUTES);
126
127 writer.flush();
128
129 renderHeaderOrFooter(facesContext, writer, component, columns, true);
131 renderChildren(facesContext, writer, component, columns);
132
133 renderHeaderOrFooter(facesContext, writer, component, columns, false);
135 writer.endElement(HTML.TABLE_ELEM);
136 }
137
138
139 private void renderHeaderOrFooter(FacesContext context,
140 ResponseWriter writer,
141 UIComponent component,
142 int columns,
143 boolean header)
144 throws IOException
145 {
146 UIComponent facet = component.getFacet(header ? "header" : "footer");
147 if (facet == null) return;
148
149 HtmlRendererUtils.writePrettyLineSeparator(context);
150 writer.startElement(header ? HTML.THEAD_ELEM : HTML.TFOOT_ELEM, component);
151 writer.startElement(HTML.TR_ELEM, component);
152 writer.startElement(header ? HTML.TH_ELEM : HTML.TD_ELEM, component);
153
154 String styleClass = (component instanceof HtmlPanelGrid)
155 ? (header ?
156 ((HtmlPanelGrid)component).getHeaderClass() :
157 ((HtmlPanelGrid)component).getFooterClass())
158 : (header ?
159 (String )component.getAttributes().get(JSFAttr.HEADER_CLASS_ATTR) :
160 (String )component.getAttributes().get(JSFAttr.FOOTER_CLASS_ATTR));
161 if (styleClass != null)
162 {
163 writer.writeAttribute(HTML.CLASS_ATTR, styleClass,
164 header ? JSFAttr.HEADER_CLASS_ATTR : JSFAttr.FOOTER_CLASS_ATTR);
165 }
166
167 if (header)
168 {
169 writer.writeAttribute(HTML.SCOPE_ATTR, HTML.SCOPE_COLGROUP_VALUE, null);
170 }
171
172 writer.writeAttribute(HTML.COLSPAN_ATTR, Integer.toString(columns), null);
173
174 HtmlRendererUtils.writePrettyLineSeparator(context);
175 RendererUtils.renderChild(context, facet);
176
177 HtmlRendererUtils.writePrettyLineSeparator(context);
178 writer.endElement(header ? HTML.TH_ELEM : HTML.TD_ELEM);
179 writer.endElement(HTML.TR_ELEM);
180 writer.endElement(header ? HTML.THEAD_ELEM : HTML.TFOOT_ELEM);
181 }
182
183
184 private void renderChildren(FacesContext context,
185 ResponseWriter writer,
186 UIComponent component,
187 int columns)
188 throws IOException
189 {
190 try
191 {
192 writer.startElement(HTML.TBODY_ELEM, component);
193
194 String columnClasses;
195 String rowClasses;
196 if (component instanceof HtmlPanelGrid)
197 {
198 columnClasses = ((HtmlPanelGrid)component).getColumnClasses();
199 rowClasses = ((HtmlPanelGrid)component).getRowClasses();
200 }
201 else
202 {
203 columnClasses = (String )component.getAttributes().get(JSFAttr.COLUMN_CLASSES_ATTR);
204 rowClasses = (String )component.getAttributes().get(JSFAttr.ROW_CLASSES_ATTR);
205 }
206
207 String [] columnClassesArray = (columnClasses == null)
208 ? ArrayUtils.EMPTY_STRING_ARRAY
209 : StringUtils.trim(StringUtils.splitShortString(columnClasses, ','));
210 int columnClassesCount = columnClassesArray.length;
211
212 String [] rowClassesArray = (rowClasses == null)
213 ? ArrayUtils.EMPTY_STRING_ARRAY
214 : StringUtils.trim(StringUtils.splitShortString(rowClasses, ','));
215 int rowClassesCount = rowClassesArray.length;
216
217 int childCount = component.getChildCount();
218 if (childCount > 0)
219 {
220 int columnIndex = 0;
221 int rowClassIndex = 0;
222 boolean rowStarted = false;
223 for (Iterator it = component.getChildren().iterator(); it.hasNext(); )
224 {
225 UIComponent child = (UIComponent)it.next();
226 if (child.isRendered())
227 {
228 if (columnIndex == 0)
229 {
230 if (rowStarted)
232 {
233 writer.endElement(HTML.TR_ELEM);
235 HtmlRendererUtils.writePrettyLineSeparator(context);
236 }
237 writer.startElement(HTML.TR_ELEM, component);
238 if (rowClassIndex < rowClassesCount) {
239 writer.writeAttribute(HTML.CLASS_ATTR, rowClassesArray[rowClassIndex], null);
240 }
241 rowStarted = true;
242 rowClassIndex++;
243 if (rowClassIndex == rowClassesCount) {
244 rowClassIndex = 0;
245 }
246 }
247
248 writer.startElement(HTML.TD_ELEM, component);
249 if (columnIndex < columnClassesCount)
250 {
251 writer.writeAttribute(HTML.CLASS_ATTR, columnClassesArray[columnIndex], null);
252 }
253 RendererUtils.renderChild(context, child);
254 writer.endElement(HTML.TD_ELEM);
255
256 columnIndex++;
257 if (columnIndex >= columns) {
258 columnIndex = 0;
259 }
260 }
261 }
262
263 if (rowStarted)
264 {
265 if (columnIndex > 0)
266 {
267 if (log.isWarnEnabled()) log.warn("PanelGrid " + component.getClientId(context) + " has not enough children. Child count should be a multiple of the columns attribute.");
268 for ( ; columnIndex < columns; columnIndex++)
270 {
271 writer.startElement(HTML.TD_ELEM, component);
272 if (columnIndex < columnClassesCount)
273 {
274 writer.writeAttribute(HTML.CLASS_ATTR, columnClassesArray[columnIndex], null);
275 }
276 writer.endElement(HTML.TD_ELEM);
277 }
278 }
279 writer.endElement(HTML.TR_ELEM);
280 HtmlRendererUtils.writePrettyLineSeparator(context);
281 }
282 }
283
284 writer.endElement(HTML.TBODY_ELEM);
285 }
286 catch(IOException ex)
287 {
288 throw ex;
289 }
290 catch(RuntimeException ex2)
291 {
292 log.error("Exception while rendering children of panel-grid.",ex2);
293 throw ex2;
294 }
295 }
296
297 }
298 |
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