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Wed Nov 19 04:39:43 2008 UTC (11 years ago) by gage
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corrected formatting in POD documentation

    1 ################################################################################
    2 # WeBWorK Online Homework Delivery System
    3 # Copyright  2000-2007 The WeBWorK Project, http://openwebwork.sf.net/
    4 # $CVSHeader: pg/lib/Applet.pm,v 1.12 2008/05/22 19:15:59 gage Exp $
    5 #
    6 # This program is free software; you can redistribute it and/or modify it under
    7 # the terms of either: (a) the GNU General Public License as published by the
    8 # Free Software Foundation; either version 2, or (at your option) any later
    9 # version, or (b) the "Artistic License" which comes with this package.
   10 #
   11 # This program is distributed in the hope that it will be useful, but WITHOUT
   12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   13 # FOR A PARTICULAR PURPOSE.  See either the GNU General Public License or the
   14 # Artistic License for more details.
   15 ################################################################################
   16 
   17 =head1 NAME
   18 
   19 Applet.pl - Provides code for inserting FlashApplets and JavaApplets into webwork problems
   20 
   21 =head1 SYNPOSIS
   22 
   23   ###################################
   24   # Create  link to applet
   25   ###################################
   26   my $appletName = "LineThruPointsWW";
   27   $applet = new FlashApplet(
   28      # can be replaced by $applet =FlashApplet() when using AppletObjects.pl
   29      codebase   => findAppletCodebase("$appletName.swf"),
   30      appletName => $appletName,
   31      appletId   => $appletName,
   32      submitActionAlias => 'checkAnswer',
   33   );
   34 
   35   ###################################
   36   # Configure applet
   37   ###################################
   38 
   39   #xml data to set up the problem-rac
   40   $applet->config(qq{<XML>
   41   <point xval='$xval_1' yval='$yval_1' />
   42   <point xval='$xval_2' yval='$yval_2' />
   43   </XML>});
   44 
   45 
   46   ###################################
   47   # insert applet header material
   48   ###################################
   49   HEADER_TEXT($applet->insertHeader );
   50 
   51   ###################################
   52   # Text section
   53   #
   54 
   55   ###################################
   56   #insert applet into body
   57   ###################################
   58   TEXT( MODES(TeX=>'object code', HTML=>$applet->insertObject));
   59 
   60 
   61 =head1 DESCRIPTION
   62 
   63 This file provides an object to store in one place
   64 all of the information needed to call an applet.
   65 
   66 The object FlashApplet has defaults for inserting flash applets.
   67 
   68 =over
   69 
   70 =item *
   71 
   72 =item *
   73 
   74 =back
   75 
   76 (not yet completed)
   77 
   78 The module JavaApplet has defaults for inserting java applets.
   79 
   80 The module Applet stores common code for the two types of applet.
   81 
   82 =head1 USAGE
   83 
   84 These modules are activate by listing it in the modules section of global.conf and rebooting the server.
   85 The companion file to this one is macros/AppletObjects.pl
   86 
   87 qw(Applet FlashApplet JavaApplet)
   88 
   89 =cut
   90 
   91 
   92 
   93 package Applet;
   94 
   95 use URI::Escape;
   96 
   97 
   98 
   99 use MIME::Base64 qw( encode_base64 decode_base64);
  100 
  101 
  102 =head2 Default javaScript functions placed in header
  103 
  104 =pod
  105 
  106 These functions are automatically defined for use for
  107 any javaScript placed in the text of a PG question.
  108 
  109     getApplet(appletName)  -- finds the applet path in the DOM
  110 
  111     submitAction()            -- calls the submit action of the applets
  112 
  113     initializeAction()        -- calls the initialize action of the applets
  114 
  115     getQE(name)               -- gets an HTML element of the question by name
  116                                  or by id.  Be sure to keep all names and ids
  117                                  unique within a given PG question.
  118 
  119     getQuestionElement(name)  -- long form of getQE(name)
  120 
  121     listQuestionElements()    -- for discovering the names of inputs in the
  122                                  PG question.  An alert dialog will list all
  123                                  of the elements.
  124       Usage: Place this at the END of the question, just before END_DOCUMENT():
  125 
  126                 TEXT(qq!<script> listQuestionElements() </script>!);
  127                 ENDDOCUMENT();
  128              to obtain a list of all of the HTML elements in the question
  129 
  130     List of  accessor methods made available by the FlashApplet class:
  131         Usage:  $current_value = $applet->method(new_value or empty)
  132         These can also be set when creating the class -- for exampe:
  133              $applet = new FlashApplet(
  134                        # can be replaced by $applet =FlashApplet() when using AppletObjects.pl
  135                        codebase   => findAppletCodebase("$appletName.swf"),
  136                        appletName => $appletName,
  137                        appletId   => $appletName,
  138                        submitActionAlias => 'checkAnswer',
  139             );
  140 
  141 
  142         appletId         for simplicity and reliability appletId and appletName are always the same
  143         appletName
  144         archive      the name of the .jar file containing the applet code
  145         code         the name of the applet code in the .jar archive
  146         codebase     a prefix url used to find the archive and the applet itself
  147 
  148         height       rectangle alloted in the html page for displaying the applet
  149 
  150         params       an anonymous array containing name/value pairs
  151                      to configure the applet [name =>'value, ...]
  152 
  153         header       stores the text to be added to the header section of the html page
  154         object       stores the text which places the applet on the html page
  155 
  156         debug        in debug mode several alerts mark progress through the procedure of calling the applet
  157 
  158         config       configuration are those customizable attributes of the applet which don't
  159                      change as it is used.  When stored in hidden answer fields
  160                      it is usually stored in base64 encoded format.
  161         base64_config base64 encode version of the contents of config
  162 
  163         configAlias  (default: config ) names the applet command called with the contents of $self->config
  164                      to configure the applet.  The parameters are passed to the applet in plain text using <xml>
  165                      The outer tags must be   <xml> .....   </xml>
  166         state        state consists of those customizable attributes of the applet which change
  167                      as the applet is used.  It is stored by the calling .pg question so that
  168                      when revisiting the question the applet
  169                      will be restored to the same state it was left in when the question was last
  170                      viewed.
  171 
  172         getStateAlias  (default: getState) alias for command called to read the current state of the applet.
  173                        The state is passed in plain text xml format with outer tags: <xml>....</xml>
  174         setStateAlias  (default: setState) alias for the command called to reset the  state of the applet.
  175                        The state is passed in plain text in xml format with outer tags: <xml>....</xml>
  176 
  177         base64_state   returns the base64 encoded version of the state stored in the applet object.
  178 
  179         initializeActionAlias  -- (default: initializeAction) the name of the javaScript subroutine called to initialize the applet (some overlap with config/ and setState
  180         submitActionAlias      -- (default: submitAction)the name of the javaScript subroutine called when the submit button of the
  181                                   .pg question is pressed.
  182 
  183         returnFieldName
  184 
  185 
  186 =cut
  187 
  188 
  189 
  190 
  191 sub new {
  192    my $class = shift;
  193    my $self = {
  194     appletName =>'',
  195     code=>'',
  196     codebase=>'',
  197 #   appletId  =>'',   #always use identical applet Id's and applet Names
  198     params    =>undef,
  199     width     => 550,
  200     height    => 400,
  201     base64_state       =>  undef,     # this is an state to use for initializing the first occurence of the question.
  202     base64_config      =>  undef,     # this is the initial (and final?) configuration
  203     getStateAlias      =>  'getXML',
  204     setStateAlias      =>  'setXML',
  205     configAlias        =>  'config',
  206     initializeActionAlias => 'setXML',
  207     submitActionAlias  =>  'getXML',
  208     returnFieldName    =>  'receivedField',
  209     headerText         =>  DEFAULT_HEADER_TEXT(),
  210     objectText         => '',
  211     debug              => 0,
  212     @_,
  213   };
  214   bless $self, $class;
  215   $self->state('<xml></xml>');
  216   $self->config('<xml></xml>');
  217   return $self;
  218 }
  219 
  220 sub  header {
  221   my $self = shift;
  222   if ($_[0] eq "reset") {  # $applet->header('reset');  erases default header text.
  223     $self->{headerText}='';
  224   } else {
  225     $self->{headerText} .= join("",@_);  # $applet->header(new_text); concatenates new_text to existing header.
  226   }
  227     $self->{headerText};
  228 }
  229 sub  object {
  230   my $self = shift;
  231   if ($_[0] eq "reset") {
  232     $self->{objectText}='';
  233   } else {
  234     $self->{objectText} .= join("",@_);
  235   }
  236     $self->{objectText};
  237 }
  238 sub params {
  239   my $self = shift;
  240   if (ref($_[0]) =~/HASH/) {
  241     $self->{params} = shift;
  242   } elsif ( !defined($_[0]) or $_[0] =~ '') {
  243     # do nothing (read)
  244   } else {
  245     warn "You must enter a reference to a hash for the parameter list";
  246   }
  247   $self->{params};
  248 }
  249 
  250 sub initializeActionAlias {
  251   my $self = shift;
  252   $self->{initializeActionAlias} = shift ||$self->{initializeActionAlias}; # replace the current contents if non-empty
  253     $self->{initializeActionAlias};
  254 }
  255 
  256 sub submitActionAlias {
  257   my $self = shift;
  258   $self->{submitActionAlias} = shift ||$self->{submitActionAlias}; # replace the current contents if non-empty
  259     $self->{submitActionAlias};
  260 }
  261 sub getStateAlias {
  262   my $self = shift;
  263   $self->{getStateAlias} = shift ||$self->{getStateAlias}; # replace the current contents if non-empty
  264     $self->{getStateAlias};
  265 }
  266 
  267 sub setStateAlias {
  268   my $self = shift;
  269   $self->{setStateAlias} = shift ||$self->{setStateAlias}; # replace the current contents if non-empty
  270     $self->{setStateAlias};
  271 }
  272 sub configAlias {
  273   my $self = shift;
  274   $self->{configAlias} = shift ||$self->{configAlias}; # replace the current contents if non-empty
  275     $self->{configAlias};
  276 }
  277 sub returnFieldName {
  278   my $self = shift;
  279   $self->{returnFieldName} = shift ||$self->{returnFieldName}; # replace the current contents if non-empty
  280     $self->{returnFieldName};
  281 }
  282 sub codebase {
  283   my $self = shift;
  284   $self->{codebase} = shift ||$self->{codebase}; # replace the current codebase if non-empty
  285     $self->{codebase};
  286 }
  287 sub code {
  288   my $self = shift;
  289   $self->{code} = shift ||$self->{code}; # replace the current code if non-empty
  290     $self->{code};
  291 }
  292 sub height {
  293   my $self = shift;
  294   $self->{height} = shift ||$self->{height}; # replace the current height if non-empty
  295     $self->{height};
  296 }
  297 sub width {
  298   my $self = shift;
  299   $self->{width} = shift ||$self->{width}; # replace the current width if non-empty
  300     $self->{width};
  301 }
  302 sub archive {
  303   my $self = shift;
  304   $self->{archive} = shift ||$self->{archive}; # replace the current archive if non-empty
  305     $self->{archive};
  306 }
  307 sub appletName {
  308   my $self = shift;
  309   $self->{appletName} = shift ||$self->{appletName}; # replace the current appletName if non-empty
  310     $self->{appletName};
  311 }
  312 sub debug {
  313   my $self = shift;
  314   my $new_flag = shift;
  315   $self->{debug} = $new_flag if defined($new_flag);
  316   $self->{debug};
  317 }
  318 sub appletId {
  319   appletName(@_);
  320 }
  321 sub state {
  322   my $self = shift;
  323   my $str = shift;
  324   $self->{base64_state} =  encode_base64($str)   ||$self->{base64_state}; # replace the current string if non-empty
  325   $self->{base64_state} =~ s/\n//g;
  326     decode_base64($self->{base64_state});
  327 }
  328 
  329 sub base64_state{
  330   my $self = shift;
  331   $self->{base64_state} = shift ||$self->{base64_state}; # replace the current string if non-empty
  332     $self->{base64_state};
  333 }
  334 sub config {
  335   my $self = shift;
  336   my $str = shift;
  337   $self->{base64_config} =  encode_base64($str)   || $self->{base64_config}; # replace the current string if non-empty
  338   $self->{base64_config} =~ s/\n//g;
  339     decode_base64($self->{base64_config});
  340 }
  341 sub base64_config {
  342   my $self = shift;
  343   $self->{base64_config} = shift ||$self->{base64_config}; # replace the current string if non-empty
  344   $self->{base64_config} =$self->{base64_config};
  345     $self->{base64_config};
  346 }
  347 #FIXME
  348 # need to be able to adjust header material
  349 
  350 sub insertHeader {
  351     my $self = shift;
  352     my $codebase         =  $self->codebase;
  353     my $appletId         =  $self->appletId;
  354     my $appletName       =  $self->appletName;
  355     my $base64_initialState     = $self->base64_state;
  356     my $initializeAction =  $self->initializeActionAlias;
  357     my $submitAction     =  $self->submitActionAlias;
  358     my $setState         =  $self->setStateAlias;
  359     my $getState         =  $self->getStateAlias;
  360     my $config           =  $self->configAlias;
  361     my $base64_config    =  $self->base64_config;
  362     my $debugMode        =  ($self->debug) ? "1": "0";
  363     my $returnFieldName  =  $self->{returnFieldName};
  364 #    my $encodeStateQ    =  ($self->debug)?'' : "state = Base64.encode(state);";              # in debug mode base64 encoding is not used.
  365 #     my $decodeStateQ   =  "if (!state.match(/<XML>*/i) ) {state = Base64.decode(state)}";   # decode if <XML> is not present
  366     my $headerText       =  $self->header();
  367 
  368     $headerText =~ s/(\$\w+)/$1/gee;   # interpolate variables p17 of Cookbook
  369 
  370     return $headerText;
  371 
  372 
  373 }
  374 
  375 sub insertObject {
  376     my $self       = shift;
  377     my $code       = $self->{code};
  378     my $codebase   = $self->{codebase};
  379     my $appletId   = $self->{appletName};
  380     my $appletName = $self->{appletName};
  381     my $archive    = $self->{archive};
  382     my $width      = $self->{width};
  383     my $height     = $self->{height};
  384     my $javaParameters = '';
  385     my $flashParameters = '';
  386     my %param_hash = %{$self->params()};
  387     foreach my $key (keys %param_hash) {
  388       $javaParameters .= qq!<param name ="$key"  value = "$param_hash{$key}">\n!;
  389       $flashParameters .= uri_escape($key).'='.uri_escape($param_hash{$key}).'&';
  390     }
  391     $flashParameters =~ s/\&$//;    # trim last &
  392 
  393 
  394     $objectText = $self->{objectText};
  395     $objectText =~ s/(\$\w+)/$1/gee;
  396     return $objectText;
  397 }
  398 sub initialize  {
  399     my $self = shift;
  400   return q{
  401     <script>
  402       initializeAction();
  403       // this should really be done in the <body> tag
  404     </script>
  405   };
  406 
  407 }
  408 ########################################################
  409 # HEADER material for one flash or java applet
  410 ########################################################
  411 
  412 use constant DEFAULT_HEADER_TEXT =><<'END_HEADER_SCRIPT';
  413 
  414   <script language="JavaScript">
  415 
  416   // set debug mode for this applet
  417     set_debug($debugMode);
  418 
  419   //////////////////////////////////////////////////////////
  420   //CONFIGURATIONS
  421   //
  422     // configurations are "permanent"
  423     //////////////////////////////////////////////////////////
  424 
  425     applet_config_list["$appletName"]   = function() {
  426         debug_add("applet_config_list:\n attempt to configure $appletName . $config ( $base64_config ) if config function is defined: "
  427         );
  428       try {
  429           if (( typeof(getApplet("$appletName").$config)  == "function" ) ) {
  430               debug_add("CONFIGURE $appletName");
  431           getApplet("$appletName").$config(Base64.decode("$base64_config"));
  432         }
  433       } catch(e) {
  434         alert("Error executing configuration command $config for $appletName: " + e );
  435       }
  436     }
  437     ////////////////////////////////////////////////////////////
  438     //
  439     //STATE:
  440     // state can vary as the applet is manipulated -- it is reset from the questions _state values
  441     //
  442     //////////////////////////////////////////////////////////
  443 
  444     applet_setState_list["$appletName"] = function(state) {
  445     debug_add("Begin setState for applet $appletName");
  446     debug_add("Obtain state from $appletName"+"_state");
  447     state =  state || getQE("$appletName"+"_state").value;
  448     if ( base64Q(state) ) {
  449       state=Base64.decode(state);
  450     }
  451     if (state.match(/<xml/i) || state.match(/<?xml/i) ) {  // if state starts with <?xml
  452 
  453       debug_add("applet_setState_list: \n set (decoded) state for $appletName to " +
  454            state +"\nfunction type is " +typeof(getApplet("$appletName").$setState)
  455       );
  456       try {
  457       if (( typeof(getApplet("$appletName").$setState)  =="function" ) ) {
  458         debug_add("setState for $appletName");
  459         getApplet("$appletName").$setState( state );
  460       }
  461       } catch(e) {
  462       alert("Error in setting state of $appletName using command $setState : " + e );
  463       }
  464     } else if (debug) {
  465       alert("new state was empty string or did not begin with <xml-- state was not reset");
  466     }
  467   };
  468   applet_getState_list["$appletName"] = function () {
  469     debug_add("get current state for applet $appletName and store it in $appletName"+"_state");
  470     var applet = getApplet("$appletName");
  471     try {
  472       if (( typeof(applet.$getState)  == "function" ) ) {  // there may be no state function
  473         state  = applet.$getState();                     // get state in xml format
  474         debug_add("state has type " + typeof(state));
  475         state  = String(state);                          // geogebra returned an object type instead of a string type
  476         debug_add("state converted to type " + typeof(state));
  477       }
  478 
  479       if (!debug) {
  480         state = Base64.encode(state);
  481       };   // replace state by encoded version unless in debug mode
  482 
  483       debug_add("state is "+state);                  // this should still be in plain text
  484       getQE("$appletName"+"_state").value = state;   //place state in input item (debug: textarea, otherwise: hidden)
  485     } catch (e) {
  486       alert("Error in getting state for $appletName " + e );
  487     }
  488     };
  489 
  490     ////////////////////////////////////////////////////////////
  491     //
  492     //INITIALIZE
  493     //
  494     ////////////////////////////////////////////////////////////
  495 
  496 
  497     applet_checkLoaded_list["$appletName"] = function() { // this function returns 0 unless:
  498                                                       // applet has already been flagged as ready in applet_isReady_list
  499                                                       // applet.config is defined  (or alias for .config)
  500                                                       // applet.setState is defined
  501                                                       // applet.isActive is defined
  502                                                       // applet reported that it is loaded by calling loadQ()
  503       var ready = 0;
  504       var applet = getApplet("$appletName");
  505           if (!debug && applet_isReady_list["$appletName"]) {return(1)}; // memorize readiness in non-debug mode
  506         if ( typeof(applet.$config) == "function") {
  507             debug_add( "applet.config is " + typeof(applet.$config) );
  508           ready = 1;
  509         }
  510         if( typeof(applet.$getState) == "function") {
  511             debug_add( "applet.getState is " + typeof(applet.$getState) );
  512           ready =1;
  513         }
  514         if (typeof(applet.isActive) == "function" && applet.isActive ) {
  515           debug_add( "applet.isActive is " + typeof(applet.isActive) );
  516           ready =1;
  517         }
  518         if (typeof(applet_reportsLoaded_list["$appletName"]) !="undefined" && applet_reportsLoaded_list["$appletName"] != 0 ) {
  519           debug_add( "applet reports that it is loaded " + applet_reportsLoaded_list["$appletName"] );
  520           ready =1;
  521         }
  522       applet_isReady_list["$appletName"]= ready;
  523       return(ready);
  524     }
  525 
  526     applet_initializeAction_list["$appletName"] = function (state) {
  527           applet_setState_list["$appletName"](state);
  528   };
  529 
  530   applet_submitAction_list["$appletName"] = function () {
  531         if (! applet_isReady_list["$appletName"]  ) {
  532           alert("$appletName is not ready");
  533         }
  534           applet_getState_list["$appletName"]();
  535       //getQE("$returnFieldName").value = getApplet("$appletName").sendData();  //FIXME -- not needed in general?
  536     };
  537     </script>
  538 
  539 END_HEADER_SCRIPT
  540 
  541 package FlashApplet;
  542 @ISA = qw(Applet);
  543 
  544 
  545 =head2 Insertion HTML code for FlashApplet
  546 
  547 =pod
  548 
  549 The secret to making this applet work with IE in addition to normal browsers
  550 is the addition of the C(<form></form>) construct just before the object.
  551 
  552 For some reason IE has trouble locating a flash object which is contained
  553 within a form.  Adding this second blank form with the larger problemMainForm
  554 seems to solve the problem.
  555 
  556 This follows method2 of the advice given in url(http://kb.adobe.com/selfservice/viewContent.do?externalId=kb400730&sliceId=2)
  557 Method1 and methods involving SWFObject(Geoff Stearns) and SWFFormFix (Steve Kamerman) have yet to be fully investigated:
  558 http://devel.teratechnologies.net/swfformfix/swfobject_swfformfix_source.js
  559 http://www.teratechnologies.net/stevekamerman/index.php?m=01&y=07&entry=entry070101-033933
  560 
  561     use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
  562       <form></form>
  563       <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
  564            id="$appletName" width="500" height="375"
  565            codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
  566          <param name="movie" value="$codebase/$appletName.swf" />
  567          <param name="quality" value="high" />
  568          <param name="bgcolor" value="#869ca7" />
  569          <param name="allowScriptAccess" value="sameDomain" />
  570          <embed src="$codebase/$appletName.swf" quality="high" bgcolor="#869ca7"
  571            width="$width" height="$height" name="$appletName" align="middle" id="$appletName"
  572            play="true" loop="false" quality="high" allowScriptAccess="sameDomain"
  573            type="application/x-shockwave-flash"
  574            pluginspage="http://www.macromedia.com/go/getflashplayer">
  575          </embed>
  576 
  577        </object>
  578     END_OBJECT_TEXT
  579 
  580 
  581 =cut
  582 
  583 use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
  584   <form></form>
  585   <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
  586              id="$appletName" width="500" height="375"
  587              codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
  588          <param name="movie" value="$codebase/$appletName.swf" />
  589          <param name="quality" value="high" />
  590          <param name="bgcolor" value="#869ca7" />
  591          <param name="allowScriptAccess" value="sameDomain" />
  592          <param name="FlashVars" value="$flashParameters"/>
  593          <embed src="$codebase/$appletName.swf" quality="high" bgcolor="#869ca7"
  594              width="$width" height="$height" name="$appletName" align="middle" id="$appletName"
  595              play="true" loop="false" quality="high" allowScriptAccess="sameDomain"
  596              type="application/x-shockwave-flash"
  597              pluginspage="http://www.macromedia.com/go/getflashplayer"
  598              FlashVars="$flashParameters">
  599          </embed>
  600 
  601      </object>
  602 END_OBJECT_TEXT
  603 
  604 sub new {
  605     my $class = shift;
  606   $class -> SUPER::new( objectText   => DEFAULT_OBJECT_TEXT(),
  607                   @_
  608   );
  609 
  610 }
  611 
  612 
  613 package JavaApplet;
  614 @ISA = qw(Applet);
  615 
  616 =head2 Insertion HTML code for JavaApplet
  617 
  618 =pod
  619 
  620 The secret to making this applet work with IE in addition to normal browsers
  621 is the addition of the C(<form></form>) construct just before the object.
  622 
  623 For some reason IE has trouble locating a flash object which is contained
  624 within a form.  Adding this second blank form with the larger problemMainForm
  625 seems to solve the problem.
  626 
  627 This follows method2 of the advice given in url(http://kb.adobe.com/selfservice/viewContent.do?externalId=kb400730&sliceId=2)
  628 Method1 and methods involving SWFObject(Geoff Stearns) and SWFFormFix (Steve Kamerman) have yet to be fully investigated:
  629 http://devel.teratechnologies.net/swfformfix/swfobject_swfformfix_source.js
  630 http://www.teratechnologies.net/stevekamerman/index.php?m=01&y=07&entry=entry070101-033933
  631 
  632     use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
  633       <form></form>
  634      <applet
  635       code     = "$code"
  636       codebase = "$codebase"
  637       archive  = "$archive"
  638       name     = "$appletName"
  639       id       = "$appletName"
  640       width    = "$width"
  641       height   = "$height"
  642       MAYSCRIPT
  643      >
  644       $javaParameters
  645      </applet>
  646     END_OBJECT_TEXT
  647 
  648 =cut
  649 
  650 use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
  651   <form></form>
  652  <applet
  653   code     = "$code"
  654   codebase = "$codebase"
  655   archive  = "$archive"
  656   name     = "$appletName"
  657     id       = "$appletName"
  658     width    = "$width"
  659     height   = "$height"
  660     MAYSCRIPT
  661  >
  662   $javaParameters
  663 
  664   Sorry, the Applet could not be started. Please make sure that
  665 Java 1.4.2 (or later) is installed and activated.
  666 (<a href="http://java.sun.com/getjava">click here to install Java now</a>)
  667  </applet>
  668 END_OBJECT_TEXT
  669 
  670 sub new {
  671     my $class = shift;
  672   $class -> SUPER::new( objectText   => DEFAULT_OBJECT_TEXT(),
  673                   @_
  674   );
  675 
  676 }
  677 
  678 
  679 
  680 1;

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