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Use Dojo with Vaadin / Inject external file into head block of Vaadin page response

/ Published in: Groovy
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  1. package com.vaadin.terminal.gwt.server;
  2.  
  3. import javax.servlet.http.HttpServletRequest;
  4.  
  5. /**
  6.  * Created by IntelliJ IDEA.
  7.  * User: laurence
  8.  * Date: Jul 29, 2011
  9.  * Time: 8:06:44 PM
  10.  *
  11.  * com.vaadin.terminal.gwt.server.ApplicationServlet2
  12.  *
  13.  * Needed to create this for Dojo to work with Vaadin.
  14.  *
  15.  * This looks for a file named header.inc.htm in
  16.  * dir getServletContext().getRealPath(".");
  17.  * and injects it into a vaadin page response (providing it exists)
  18.  *
  19.  * You must change your vaadin servlet name in web.xml
  20.  *  from: com.vaadin.terminal.gwt.server.ApplicationServlet
  21.  *  to:   com.vaadin.terminal.gwt.server.ApplicationServlet2
  22.  *
  23.  * Also noticed the inline dojo method script button onClick events
  24.  * do not work in Vaadin custom layout templates
  25.  * but the new dojo html5 way of handling button clicks does work
  26.  *
  27.  *  Also had to use dojo to update the body class to the tundra style
  28.  *
  29.     <script type="text/javascript">
  30.     // <![CDATA[
  31.         dojo.ready( function() { dojo.addClass( dojo.body() , "tundra"); } );
  32.     // ]]>
  33.     </script>
  34.  *
  35.  *
  36.  */
  37.  
  38.  
  39. public class ApplicationServlet2
  40. extends com.vaadin.terminal.gwt.server.ApplicationServlet {
  41.  
  42.     public ApplicationServlet2() {
  43.         super();
  44.     }
  45.  
  46.     def String doTemplate(String aStrTemplate, Map aBindingMap) {
  47.         def engine = new groovy.text.SimpleTemplateEngine();
  48.         def template = engine.createTemplate(aStrTemplate).make(aBindingMap);
  49.         return template.toString();
  50.     }
  51.  
  52.     def writeDebugString1( BufferedWriter a_page, String a_path ) {
  53.         // ij ide """ syntax highlighting workaround
  54.         def sDebug1_templ = '''
  55. <!--
  56.     header.inc.htm
  57.         web  path: .
  58.         file path: ${a_path}
  59. -->
  60.         '''.trim();
  61.         def sDebug1 = doTemplate(sDebug1_templ, ["a_path": a_path] as Map);
  62.  
  63.         a_page.write(sDebug1 as String);
  64.     }
  65.  
  66.     @Override
  67.     protected void writeAjaxPageHtmlHeadStart(BufferedWriter page,
  68.                                               HttpServletRequest request)
  69.     throws IOException {
  70.         super.writeAjaxPageHtmlHeadStart(page, request);
  71.  
  72.         def sPath1 = this.getServletContext().getRealPath(".");
  73.         def sPath2 = new File(sPath1).getCanonicalPath();
  74.         def sPath3 = "${sPath2}${File.separator}header.inc.htm";
  75.  
  76.         def fo = new File(sPath3);
  77.  
  78.         page.write("\n<!-- header.inc.htm beg -->\n");
  79.         writeDebugString1( page, sPath3 );
  80.  
  81.         if (fo.exists()) {
  82.             def sHeaderInc = fo.text;
  83.             page.write(sHeaderInc as String);
  84.         }
  85.  
  86.         page.write("\n<!-- header.inc.htm end -->\n\n");
  87.     }
  88.  
  89.     //
  90. }

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