TabsTag


1   /*
2    * JOnAS: Java(TM) Open Application Server
3    * Copyright (C) 1999 Bull S.A.
4    * Contact: jonas-team@objectweb.org
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
19   * USA
20   *
21   * Initial developer(s): Michel-Ange ANTON
22   * --------------------------------------------------------------------------
23   * $Id: TabsTag.java,v 1.5 2003/06/20 17:15:42 antonma Exp $
24   * --------------------------------------------------------------------------
25   */
26  
27  package org.objectweb.jonas.webapp.taglib;
28  
29  import java.io.IOException  ;
30  import java.util.ArrayList  ;
31  
32  import javax.servlet.jsp.JspException  ;
33  import javax.servlet.jsp.JspWriter  ;
34  
35  public class TabsTag extends WhereAreYouTag {
36  
37  // ----------------------------------------------------- Constants
38  
39      private static final String   s_ImageSeparator = "dot.gif";
40  
41  // ----------------------------------------------------- Instance Variables
42  
43      private ArrayList   m_LabelTabs = new ArrayList  ();
44      private ArrayList   m_HrefTabs = new ArrayList  ();
45      private ArrayList   m_SelectedTabs = new ArrayList  ();
46      private String   m_Body = null;
47  
48  // ------------------------------------------------------------- Properties
49  
50      private int widthTab = 0;
51      private int heightTab = 0;
52      private String   width = "100%";
53      private String   height = "";
54      private int widthSeparator = 3;
55      private int heightSeparator = 1;
56      private int marginPanel = 5;
57      private String   imagesDir = null;
58  
59      /**
60       * Accessor WidthTab property.
61       */
62      public int getWidthTab() {
63          return widthTab;
64      }
65  
66      public void setWidthTab(int widthTab) {
67          this.widthTab = widthTab;
68      }
69  
70      /**
71       * Accessor HeightTab property.
72       */
73      public int getHeightTab() {
74          return heightTab;
75      }
76  
77      public void setHeightTab(int heightTab) {
78          this.heightTab = heightTab;
79      }
80  
81      /**
82       * Accessor Width property.
83       */
84      public String   getWidth() {
85          return width;
86      }
87  
88      public void setWidth(String   width) {
89          this.width = width;
90      }
91  
92      /**
93       * Accessor Height property.
94       */
95      public String   getHeight() {
96          return height;
97      }
98  
99      /**
100      * Accessor Height property.
101      */
102     public void setHeight(String   height) {
103         this.height = height;
104     }
105 
106     /**
107      * Accessor WidthSeparator property.
108      */
109     public int getWidthSeparator() {
110         return widthSeparator;
111     }
112 
113     public void setWidthSeparator(int widthSeparator) {
114         this.widthSeparator = widthSeparator;
115     }
116 
117     /**
118      * Accessor HeightSeparator property.
119      */
120     public int getHeightSeparator() {
121         return heightSeparator;
122     }
123 
124     public void setHeightSeparator(int heightSeparator) {
125         this.heightSeparator = heightSeparator;
126     }
127 
128     /**
129      * Accessor MarginPanel property.
130      */
131     public int getMarginPanel() {
132         return marginPanel;
133     }
134 
135     public void setMarginPanel(int marginPanel) {
136         this.marginPanel = marginPanel;
137     }
138 
139     /**
140      * Accessor ImagesDir property.
141      */
142     public String   getImagesDir() {
143         return imagesDir;
144     }
145 
146     public void setImagesDir(String   imagesDir) {
147         this.imagesDir = imagesDir;
148     }
149 
150 // --------------------------------------------------------- Public Methods
151 
152     public int doStartTag()
153         throws JspException   {
154 
155         this.m_LabelTabs.clear();
156         this.m_HrefTabs.clear();
157         this.m_SelectedTabs.clear();
158         this.m_Body = null;
159 
160         return (EVAL_BODY_BUFFERED);
161     }
162 
163     /**
164      * Render this instant actions control.
165      *
166      * @exception JspException if a processing error occurs
167      */
168     public int doEndTag()
169         throws JspException   {
170         JspWriter   out = pageContext.getOut();
171         try {
172             verifySelected();
173             render(out);
174         }
175         catch (IOException   e) {
176             throw new JspException  (e);
177         }
178         return (EVAL_PAGE);
179     }
180 
181     /**
182      * Release all state information set by this tag.
183      */
184     public void release() {
185         this.m_LabelTabs.clear();
186         this.m_HrefTabs.clear();
187         this.m_SelectedTabs.clear();
188         this.m_Body = null;
189         this.width = null;
190         this.height = null;
191         this.imagesDir = null;
192     }
193 
194 // -------------------------------------------------------- Package Methods
195 
196     /**
197      * Add a new Action to the set that will be rendered by this control.
198      *
199      * @param label Localized label visible to the user
200      * @param selected Initial selected state of this option
201      * @param url URL to which control should be transferred if selected
202      */
203 
204     void addTab(String   ps_Label, String   ps_Href, boolean ps_Selected) {
205         m_LabelTabs.add(ps_Label);
206         m_HrefTabs.add(ps_Href);
207         m_SelectedTabs.add(new Boolean  (ps_Selected));
208     }
209 
210     void setBody(String   ps_Body) {
211         m_Body = ps_Body;
212     }
213 
214 // ------------------------------------------------------ Private Methods
215 
216     private void render(JspWriter   out)
217         throws IOException  , JspException   {
218         out.println("<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\" width=\"100%\">");
219         out.println("<tr>");
220         out.println("<td>");
221         renderTabs(out);
222         out.println("</td>");
223         out.println("</tr>");
224         out.println("<tr>");
225         out.println("<td>");
226         renderPanel(out);
227         out.println("</td>");
228         out.println("</tr>");
229         out.println("</table>");
230     }
231 
232     private void renderPanel(JspWriter   out)
233         throws IOException  , JspException   {
234         // Render the panel of this element
235         out.print("<table border=\"0\" cellspacing=\"0\" cellpadding=\"");
236         out.print(marginPanel);
237         out.print("\"");
238         out.print(" width=\"");
239         out.print(width);
240         out.print("\"");
241         out.println(">");
242         out.println("<tr valign=\"top\">");
243         out.println("<td class=\"panel\">");
244         out.print("<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\" width=\"");
245         out.print(width);
246         out.print("\"");
247         out.println(">");
248         out.println("<tr valign=\"top\">");
249         out.print("<td height=\"");
250         out.print(height);
251         out.println("\" class=\"panel\">");
252         if (m_Body != null) {
253             out.println(m_Body);
254         }
255         out.println("</td>");
256         out.println("</tr>");
257         out.println("</table>");
258         out.println("</td>");
259         out.println("</tr>");
260         out.println("</table>");
261     }
262 
263     private void renderTabs(JspWriter   out)
264         throws IOException  , JspException   {
265         int i = 0;
266         boolean bSelected = false;
267         StringBuffer   sbLabel = null;
268         String   sImageSep = null;
269 
270         // Prepare image separator
271         if (imagesDir != null) {
272             sImageSep = imagesDir + "/" + s_ImageSeparator;
273         }
274         else if (isUsingWhere()) {
275             sImageSep = getImagesRoot() + "/" + s_ImageSeparator;
276         }
277         else {
278             sImageSep = s_ImageSeparator;
279         }
280         // Render the beginning of this element
281         try {
282             out.println("<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\" >");
283         }
284         catch (IOException   ex) {
285         }
286 
287         // Render each defined label tab
288         int n = m_LabelTabs.size();
289         out.println("<tr>");
290         for (i = 0; i < n; i++) {
291             // Init Label display
292             sbLabel = new StringBuffer  ();
293             // Detect selected tab
294             bSelected = ((Boolean  ) m_SelectedTabs.get(i)).booleanValue();
295             // Display begin tag
296             out.print("<td align=\"center\"");
297             // Display width tab and prepare label
298             if (widthTab > 0) {
299                 out.print(" width=\"");
300                 out.print(widthTab);
301                 out.print("\"");
302                 sbLabel.append(m_LabelTabs.get(i));
303             }
304             else {
305                 sbLabel.append("&nbsp;");
306                 sbLabel.append(m_LabelTabs.get(i));
307                 sbLabel.append("&nbsp;");
308             }
309             out.print(" class=\"");
310             if (bSelected == true) {
311                 out.print("tabSelect");
312             }
313             else {
314                 out.print("tab");
315             }
316             out.print("\"");
317             // Height tab
318             if (heightTab > 0) {
319                 out.print(" height=\"");
320                 out.print(heightTab);
321                 out.print("\"");
322             }
323             out.print(">");
324 
325             // Display label
326             if ((bSelected == true) || (m_HrefTabs.get(i).toString().length() == 0)) {
327                 // Simple label
328                 out.print(sbLabel.toString());
329             }
330             else {
331                 // Link label
332                 out.print("<a HREF=\"");
333                 out.print(m_HrefTabs.get(i).toString());
334                 out.print("\"");
335                 out.print(" class=\"");
336                 out.print("tab");
337                 out.print("\"");
338                 out.print(">");
339                 out.print(sbLabel.toString());
340                 out.print("</a>");
341             }
342             out.println("</td>");
343 
344             if (i < (n - 1)) {
345                 // Separator Part
346                 out.print("<td");
347                 out.print(" class=\"tabSeparatorVertical\"");
348                 out.print(">");
349                 // Image
350                 out.print("<img SRC=\"");
351                 out.print(sImageSep);
352                 out.print("\" width=\"");
353                 out.print(widthSeparator);
354                 out.print("\" height=\"");
355                 out.print(heightSeparator);
356                 out.print("\" border=\"0\">");
357                 out.println("</td>");
358             }
359         }
360         out.println("</tr>");
361 
362         // Render underline
363         out.println("<tr>");
364         for (i = 0; i < n; i++) {
365             bSelected = ((Boolean  ) m_SelectedTabs.get(i)).booleanValue();
366             // Label Line Part
367             out.print("<td");
368             out.print(" class=\"");
369             if (bSelected == true) {
370                 out.print("tabSelect");
371             }
372             else {
373                 out.print("tabSeparatorHorizontal");
374             }
375             out.print("\"");
376             out.print(">");
377             out.print("<img SRC=\"");
378             out.print(sImageSep);
379             out.print("\" width=\"");
380             out.print(widthSeparator);
381             out.print("\" height=\"");
382             out.print(heightSeparator);
383             out.print("\" border=\"0\">");
384             out.println("</td>");
385 
386             // Last tab ?
387             if (i < (n - 1)) {
388                 // Separator Line Part
389                 out.print("<td");
390                 out.print(" class=\"tabSeparatorHorizontal\"");
391                 out.print(">");
392                 out.print("<img SRC=\"");
393                 out.print(sImageSep);
394                 out.print("\" width=\"");
395                 out.print(widthSeparator);
396                 out.print("\" height=\"");
397                 out.print(heightSeparator);
398                 out.print("\" border=\"0\">");
399                 out.println("</td>");
400             }
401         }
402         // Display end tag
403         out.println("</tr>");
404         out.println("</table>");
405     }
406 
407     /**
408      * Verify if one tab is selected else select the first.
409      */
410     private void verifySelected() {
411         boolean bFound = false;
412         for (int i = 0; i < m_SelectedTabs.size(); i++) {
413             if (bFound == true) {
414                 // unselect all next if one is found
415                 m_SelectedTabs.set(i, new Boolean  (false));
416             }
417             else {
418                 // detect the first selected
419                 bFound = ((Boolean  ) m_SelectedTabs.get(i)).booleanValue();
420             }
421         }
422         if ((bFound == false) && (m_SelectedTabs.size() > 0)) {
423             m_SelectedTabs.set(0, new Boolean  (true));
424         }
425     }
426 }
427
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