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1 : gage 5574 ################################################################################
2 :     # WeBWorK Online Homework Delivery System
3 :     # Copyright 2000-2007 The WeBWorK Project, http://openwebwork.sf.net/
4 : gage 5661 # $CVSHeader: pg/lib/Applet.pm,v 1.8 2008/03/26 02:42:20 gage Exp $
5 : gage 5574 #
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 : gage 5594 $applet = new FlashApplet(
28 :     # can be replaced by $applet =FlashApplet() when using AppletObjects.pl
29 : gage 5574 codebase => findAppletCodebase("$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 : gage 5661 $applet->config(qq{<XML>
41 : gage 5574 <point xval='$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 : gage 5619 The module Applet stores common code for the two types of applet.
81 : gage 5574
82 :     =head1 USAGE
83 :    
84 : gage 5619 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 : gage 5574
87 : gage 5619 qw(Applet FlashApplet JavaApplet)
88 :    
89 : gage 5574 =cut
90 :    
91 :    
92 :    
93 :     package Applet;
94 :    
95 : gage 5624 use URI::Escape;
96 : gage 5574
97 :    
98 :    
99 :     use MIME::Base64 qw( encode_base64 decode_base64);
100 :    
101 : gage 5594
102 :     =head2 Default javaScript functions placed in header
103 :    
104 :     These functions are automatically defined for use for
105 :     any javaScript placed in the text of a PG question.
106 :    
107 : gage 5619 getApplet(appletName) -- finds the applet path in the DOM
108 : gage 5594
109 : gage 5619 submitAction() -- calls the submit action of the applets
110 :    
111 : gage 5594
112 : gage 5619 initializeAction() -- calls the initialize action of the applets
113 : gage 5594
114 :     getQE(name) -- gets an HTML element of the question by name
115 :     or by id. Be sure to keep all names and ids
116 :     unique within a given PG question.
117 :    
118 :     getQuestionElement(name) -- long form of getQE(name)
119 :    
120 :     listQuestionElements() -- for discovering the names of inputs in the
121 :     PG question. An alert dialog will list all
122 :     of the elements.
123 :     Usage: Place this at the END of the question,
124 :     just before END_DOCUMENT():
125 :    
126 :     TEXT(qq!<script> listQuestionElements() </script>!);
127 :     ENDDOCUMENT();
128 :    
129 : gage 5619 list of accessor methods format: current_value = $self->method(new_value or empty)
130 : gage 5594
131 : gage 5619 appletId for simplicity and reliability appletId and appletName are always the same
132 :     appletName
133 :    
134 :     archive the name of the .jar file containing the applet code
135 :     code the name of the applet code in the .jar archive
136 :     codebase a prefix url used to find the archive and the applet itself
137 :    
138 :     height rectangle alloted in the html page for displaying the applet
139 :     width
140 :    
141 :     params an anonymous array containing name/value pairs
142 :     to configure the applet [name =>'value, ...]
143 :    
144 :     header stores the text to be added to the header section of the html page
145 :     object stores the text which places the applet on the html page
146 :    
147 :     debug in debug mode several alerts mark progress through the procedure of calling the applet
148 :    
149 :     config configuration are those customizable attributes of the applet which don't
150 :     change as it is used. When stored in hidden answer fields
151 :     it is usually stored in base64 encoded format.
152 :     base64_config base64 encode version of the contents of config
153 :    
154 :     configAlias (default: config ) names the applet command called with the contents of $self->config
155 :     to configure the applet. The parameters are passed to the applet in plain text using <xml>
156 :     The outer tags must be <xml> ..... </xml>
157 :     state state consists of those customizable attributes of the applet which change
158 :     as the applet is used. It is stored by the calling .pg question so that
159 :     when revisiting the question the applet
160 :     will be restored to the same state it was left in when the question was last
161 :     viewed.
162 :    
163 :     getStateAlias (default: getState) alias for command called to read the current state of the applet.
164 :     The state is passed in plain text xml format with outer tags: <xml>....</xml>
165 :     setStateAlias (default: setState) alias for the command called to reset the state of the applet.
166 :     The state is passed in plain text in xml format with outer tags: <xml>....</xml>
167 : gage 5594
168 : gage 5619 base64_state returns the base64 encoded version of the state stored in the applet object.
169 :    
170 :     initializeActionAlias -- (default: initializeAction) the name of the javaScript subroutine called to initialize the applet (some overlap with config/ and setState
171 :     submitActionAlias -- (default: submitAction)the name of the javaScript subroutine called when the submit button of the
172 :     .pg question is pressed.
173 : gage 5594
174 : gage 5619 returnFieldName
175 :    
176 :    
177 : gage 5578
178 : gage 5594
179 : gage 5574
180 : gage 5583 =cut
181 :    
182 : gage 5574
183 :    
184 :    
185 :     sub new {
186 :     my $class = shift;
187 :     my $self = {
188 :     appletName =>'',
189 : gage 5619 code=>'',
190 : gage 5574 codebase=>'',
191 : gage 5619 # appletId =>'', #always use identical applet Id's and applet Names
192 : gage 5574 params =>undef,
193 : gage 5619 width => 550,
194 :     height => 400,
195 : gage 5661 base64_state => undef, # this is an state to use for initializing the first occurence of the question.
196 :     base64_config => undef, # this is the initial (and final?) configuration
197 : gage 5619 getStateAlias => 'getXML',
198 : gage 5625 setStateAlias => 'setXML',
199 : gage 5619 configAlias => 'config',
200 :     initializeActionAlias => 'setXML',
201 :     submitActionAlias => 'getXML',
202 :     returnFieldName => 'receivedField',
203 :     headerText => DEFAULT_HEADER_TEXT(),
204 :     objectText => '',
205 :     debug => 0,
206 : gage 5574 @_,
207 :     };
208 :     bless $self, $class;
209 : gage 5661 $self->state('<xml></xml>');
210 :     $self->config('<xml></xml>');
211 : gage 5574 return $self;
212 :     }
213 :    
214 :     sub header {
215 :     my $self = shift;
216 :     if ($_[0] eq "reset") { # $applet->header('reset'); erases default header text.
217 :     $self->{headerText}='';
218 :     } else {
219 :     $self->{headerText} .= join("",@_); # $applet->header(new_text); concatenates new_text to existing header.
220 :     }
221 :     $self->{headerText};
222 :     }
223 :     sub object {
224 :     my $self = shift;
225 :     if ($_[0] eq "reset") {
226 :     $self->{objectText}='';
227 :     } else {
228 :     $self->{objectText} .= join("",@_);
229 :     }
230 :     $self->{objectText};
231 :     }
232 :     sub params {
233 :     my $self = shift;
234 :     if (ref($_[0]) =~/HASH/) {
235 :     $self->{params} = shift;
236 : gage 5619 } elsif ( !defined($_[0]) or $_[0] =~ '') {
237 : gage 5574 # do nothing (read)
238 :     } else {
239 :     warn "You must enter a reference to a hash for the parameter list";
240 :     }
241 :     $self->{params};
242 :     }
243 :    
244 :     sub initializeActionAlias {
245 :     my $self = shift;
246 :     $self->{initializeActionAlias} = shift ||$self->{initializeActionAlias}; # replace the current contents if non-empty
247 :     $self->{initializeActionAlias};
248 :     }
249 :    
250 :     sub submitActionAlias {
251 :     my $self = shift;
252 :     $self->{submitActionAlias} = shift ||$self->{submitActionAlias}; # replace the current contents if non-empty
253 :     $self->{submitActionAlias};
254 :     }
255 : gage 5619 sub getStateAlias {
256 :     my $self = shift;
257 :     $self->{getStateAlias} = shift ||$self->{getStateAlias}; # replace the current contents if non-empty
258 :     $self->{getStateAlias};
259 :     }
260 :    
261 :     sub setStateAlias {
262 :     my $self = shift;
263 :     $self->{setStateAlias} = shift ||$self->{setStateAlias}; # replace the current contents if non-empty
264 :     $self->{setStateAlias};
265 :     }
266 :     sub configAlias {
267 :     my $self = shift;
268 :     $self->{configAlias} = shift ||$self->{configAlias}; # replace the current contents if non-empty
269 :     $self->{configAlias};
270 :     }
271 : gage 5574 sub returnFieldName {
272 :     my $self = shift;
273 :     $self->{returnFieldName} = shift ||$self->{returnFieldName}; # replace the current contents if non-empty
274 :     $self->{returnFieldName};
275 :     }
276 :     sub codebase {
277 :     my $self = shift;
278 :     $self->{codebase} = shift ||$self->{codebase}; # replace the current codebase if non-empty
279 :     $self->{codebase};
280 :     }
281 : gage 5619 sub code {
282 :     my $self = shift;
283 :     $self->{code} = shift ||$self->{code}; # replace the current code if non-empty
284 :     $self->{code};
285 :     }
286 :     sub height {
287 :     my $self = shift;
288 :     $self->{height} = shift ||$self->{height}; # replace the current height if non-empty
289 :     $self->{height};
290 :     }
291 :     sub width {
292 :     my $self = shift;
293 :     $self->{width} = shift ||$self->{width}; # replace the current width if non-empty
294 :     $self->{width};
295 :     }
296 :     sub archive {
297 :     my $self = shift;
298 :     $self->{archive} = shift ||$self->{archive}; # replace the current archive if non-empty
299 :     $self->{archive};
300 :     }
301 : gage 5574 sub appletName {
302 :     my $self = shift;
303 :     $self->{appletName} = shift ||$self->{appletName}; # replace the current appletName if non-empty
304 :     $self->{appletName};
305 :     }
306 : gage 5619 sub debug {
307 : gage 5574 my $self = shift;
308 : gage 5619 my $new_flag = shift;
309 :     $self->{debug} = $new_flag if defined($new_flag);
310 :     $self->{debug};
311 : gage 5574 }
312 : gage 5619 sub appletId {
313 :     appletName(@_);
314 :     }
315 :     sub state {
316 : gage 5574 my $self = shift;
317 :     my $str = shift;
318 : gage 5619 $self->{base64_state} = encode_base64($str) ||$self->{base64_state}; # replace the current string if non-empty
319 :     $self->{base64_state} =~ s/\n//g;
320 :     decode_base64($self->{base64_state});
321 : gage 5574 }
322 :    
323 : gage 5619 sub base64_state{
324 : gage 5574 my $self = shift;
325 : gage 5619 $self->{base64_state} = shift ||$self->{base64_state}; # replace the current string if non-empty
326 :     $self->{base64_state};
327 : gage 5574 }
328 : gage 5619 sub config {
329 :     my $self = shift;
330 :     my $str = shift;
331 :     $self->{base64_config} = encode_base64($str) || $self->{base64_config}; # replace the current string if non-empty
332 :     $self->{base64_config} =~ s/\n//g;
333 :     decode_base64($self->{base64_config});
334 :     }
335 :     sub base64_config {
336 :     my $self = shift;
337 :     $self->{base64_config} = shift ||$self->{base64_config}; # replace the current string if non-empty
338 :     $self->{base64_config} =$self->{base64_config};
339 :     $self->{base64_config};
340 :     }
341 : gage 5574 #FIXME
342 :     # need to be able to adjust header material
343 :    
344 :     sub insertHeader {
345 :     my $self = shift;
346 : gage 5622 my $codebase = $self->codebase;
347 :     my $appletId = $self->appletId;
348 :     my $appletName = $self->appletName;
349 : gage 5619 my $base64_initialState = $self->base64_state;
350 : gage 5622 my $initializeAction = $self->initializeActionAlias;
351 :     my $submitAction = $self->submitActionAlias;
352 : gage 5619 my $setState = $self->setStateAlias;
353 :     my $getState = $self->getStateAlias;
354 :     my $config = $self->configAlias;
355 :     my $base64_config = $self->base64_config;
356 :     my $debugMode = ($self->debug) ? "1": "0";
357 : gage 5622 my $returnFieldName = $self->{returnFieldName};
358 :     # my $encodeStateQ = ($self->debug)?'' : "state = Base64.encode(state);"; # in debug mode base64 encoding is not used.
359 :     # my $decodeStateQ = "if (!state.match(/<XML>*/i) ) {state = Base64.decode(state)}"; # decode if <XML> is not present
360 :     my $headerText = $self->header();
361 :    
362 : gage 5574 $headerText =~ s/(\$\w+)/$1/gee; # interpolate variables p17 of Cookbook
363 :    
364 :     return $headerText;
365 :    
366 :    
367 :     }
368 :    
369 :     sub insertObject {
370 : gage 5619 my $self = shift;
371 :     my $code = $self->{code};
372 :     my $codebase = $self->{codebase};
373 :     my $appletId = $self->{appletName};
374 : gage 5574 my $appletName = $self->{appletName};
375 : gage 5619 my $archive = $self->{archive};
376 :     my $width = $self->{width};
377 :     my $height = $self->{height};
378 : gage 5624 my $javaParameters = '';
379 :     my $flashParameters = '';
380 : gage 5619 my %param_hash = %{$self->params()};
381 :     foreach my $key (keys %param_hash) {
382 : gage 5624 $javaParameters .= qq!<param name ="$key" value = "$param_hash{$key}">\n!;
383 :     $flashParameters .= uri_escape($key).'='.uri_escape($param_hash{$key}).'&';
384 : gage 5619 }
385 : gage 5624 $flashParameters =~ s/\&$//; # trim last &
386 : gage 5619
387 : gage 5624
388 : gage 5574 $objectText = $self->{objectText};
389 :     $objectText =~ s/(\$\w+)/$1/gee;
390 :     return $objectText;
391 :     }
392 :     sub initialize {
393 :     my $self = shift;
394 :     return q{
395 :     <script>
396 : gage 5619 initializeAction();
397 : gage 5574 // this should really be done in the <body> tag
398 :     </script>
399 :     };
400 :    
401 :     }
402 : gage 5661 ########################################################
403 :     # HEADER material for one flash or java applet
404 :     ########################################################
405 : gage 5574
406 : gage 5619 use constant DEFAULT_HEADER_TEXT =><<'END_HEADER_SCRIPT';
407 :    
408 :     <script language="JavaScript">
409 : gage 5661
410 :     //////////////////////////////////////////////////////////
411 : gage 5619 //CONFIGURATIONS
412 :     //
413 :     // configurations are "permanent"
414 : gage 5661 //////////////////////////////////////////////////////////
415 :    
416 : gage 5619 applet_config_list["$appletName"] = function() {
417 : gage 5661 debug_add("applet_config_list:\n configure $appletName . $config ( $base64_config )"
418 :     + typeof(getApplet("$appletName").$config)
419 :     );
420 : gage 5619 try {
421 : gage 5661 if (( typeof(getApplet("$appletName").$config) == "function" ) ) {
422 :     debug_add("configure $appletName");
423 : gage 5619 getApplet("$appletName").$config(Base64.decode("$base64_config"));
424 :     }
425 :     } catch(e) {
426 : gage 5661 alert("Error executing configuration command $config for $appletName: " + e );
427 : gage 5619 }
428 :     }
429 : gage 5661 ////////////////////////////////////////////////////////////
430 : gage 5619 //
431 : gage 5661 //STATE:
432 :     // state can vary as the applet is manipulated -- it is reset from the questions _state values
433 : gage 5619 //
434 : gage 5661 //////////////////////////////////////////////////////////
435 :    
436 :     applet_setState_list["$appletName"] = function(state) {
437 :     debug_add("Begin setState");
438 :     state = state || getQE("$appletName"+"_state").value;
439 :     if ( base64Q(state) ) {
440 :     state=Base64.decode(state);
441 :     }
442 :     if (state.match(/<xml/i) || state.match(/<?xml/i) ) { // if state starts with <?xml
443 :    
444 :     debug_add("applet_setState_list: \n set (decoded) state for $appletName to " +
445 :     state +"\nfunction type is " +typeof(getApplet("$appletName").$setState)
446 :     );
447 :     try {
448 :     if (( typeof(getApplet("$appletName").$setState) =="function" ) ) {
449 :     debug_add("setState for $appletName");
450 :     getApplet("$appletName").$setState( state );
451 :     }
452 :     } catch(e) {
453 :     alert("Error in setting state of $appletName using command $setState : " + e );
454 :     }
455 :     } else if (debug) {
456 :     alert("new state was empty string or did not begin with <xml-- state was not reset");
457 :     }
458 : gage 5619 };
459 :     applet_getState_list["$appletName"] = function () {
460 : gage 5661 if (debug) { alert("getState for applet $appletName");}
461 :     var applet = getApplet("$appletName");
462 :     try {
463 :     if (( typeof(applet.$getState) == "function" ) ) { // there may be no state function
464 :     state = applet.$getState(); // get state in xml format
465 :     }
466 :     if (debug) alert("state is " + state);
467 :     if (!debug) {state = Base64.encode(state) }; // replace state by encoded version unless in debug mode
468 :     getQE("$appletName"+"_state").value = state; //place in state htmlItem (debug: textarea, otherwise hidden)
469 :     } catch (e) {
470 :     alert("Error in getting state for $appletName " + e );
471 :     }
472 : gage 5619 };
473 : gage 5661
474 :     ////////////////////////////////////////////////////////////
475 : gage 5619 //
476 :     //INITIALIZE
477 :     //
478 : gage 5661 ////////////////////////////////////////////////////////////
479 :    
480 :    
481 :     applet_checkLoaded_list["$appletName"] = function() { // this function returns 0 unless:
482 :     // applet has already been flagged as ready in applet_isReady_list
483 :     // applet.config is defined (or alias for .config)
484 :     // applet.setState is defined
485 :     // applet.isActive is defined
486 :     // applet reported that it is loaded by calling loadQ()
487 :     var ready = 0;
488 :     var applet = getApplet("$appletName");
489 :     if (!debug && applet_isReady_list["$appletName"]) {return(1)}; // memorize readiness in non-debug mode
490 :     if ( typeof(applet.$config) == "function") {
491 :     debug_add( "applet.config is " + typeof(applet.$config) );
492 :     ready = 1;
493 :     }
494 :     if( typeof(applet.$getState) == "function") {
495 :     debug_add( "applet.getState is " + typeof(applet.$getState) );
496 :     ready =1;
497 :     }
498 :     if (typeof(applet.isActive) == "function" && applet.isActive ) {
499 :     debug_add( "applet.isActive is " + typeof(applet.isActive) );
500 :     ready =1;
501 :     }
502 :     if (typeof(applet_reportsLoaded_list["$appletName"]) !="undefined" && applet_reportsLoaded_list["$appletName"] != 0 ) {
503 :     debug_add( "applet reports that it is loaded " + applet_reportsLoaded_list["$appletName"] );
504 :     ready =1;
505 :     }
506 :     applet_isReady_list["$appletName"]=ready;
507 :     return(ready);
508 :     }
509 :    
510 :     applet_initializeAction_list["$appletName"] = function (state) {
511 :     applet_setState_list["$appletName"](state);
512 : gage 5619 };
513 :    
514 :     applet_submitAction_list["$appletName"] = function () {
515 :     applet_getState_list["$appletName"]();
516 : gage 5661 getQE("$returnFieldName").value = getApplet("$appletName").sendData(); //FIXME -- not needed in general?
517 : gage 5619 };
518 :     </script>
519 :    
520 :     END_HEADER_SCRIPT
521 :    
522 :     package FlashApplet;
523 :     @ISA = qw(Applet);
524 :    
525 :    
526 :    
527 :     =pod
528 :    
529 :     The secret to making this applet work with IE in addition to normal browsers
530 :     is the addition of the C(<form></form>) construct just before the object.
531 :    
532 :     For some reason IE has trouble locating a flash object which is contained
533 :     within a form. Adding this second blank form with the larger problemMainForm
534 :     seems to solve the problem.
535 :    
536 :     This follows method2 of the advice given in url(http://kb.adobe.com/selfservice/viewContent.do?externalId=kb400730&sliceId=2)
537 :     Method1 and methods involving SWFObject(Geoff Stearns) and SWFFormFix (Steve Kamerman) have yet to be fully investigated:
538 :     http://devel.teratechnologies.net/swfformfix/swfobject_swfformfix_source.js
539 :     http://www.teratechnologies.net/stevekamerman/index.php?m=01&y=07&entry=entry070101-033933
540 :    
541 :     use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
542 :     <form></form>
543 :     <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
544 :     id="$appletName" width="500" height="375"
545 :     codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
546 :     <param name="movie" value="$codebase/$appletName.swf" />
547 :     <param name="quality" value="high" />
548 :     <param name="bgcolor" value="#869ca7" />
549 :     <param name="allowScriptAccess" value="sameDomain" />
550 :     <embed src="$codebase/$appletName.swf" quality="high" bgcolor="#869ca7"
551 :     width="$width" height="$height" name="$appletName" align="middle" id="$appletName"
552 :     play="true" loop="false" quality="high" allowScriptAccess="sameDomain"
553 :     type="application/x-shockwave-flash"
554 :     pluginspage="http://www.macromedia.com/go/getflashplayer">
555 :     </embed>
556 :    
557 :     </object>
558 :     END_OBJECT_TEXT
559 :    
560 :    
561 :     =cut
562 :    
563 :     use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
564 :     <form></form>
565 :     <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
566 :     id="$appletName" width="500" height="375"
567 :     codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
568 :     <param name="movie" value="$codebase/$appletName.swf" />
569 :     <param name="quality" value="high" />
570 :     <param name="bgcolor" value="#869ca7" />
571 :     <param name="allowScriptAccess" value="sameDomain" />
572 : gage 5624 <param name="FlashVars" value="$flashParameters"/>
573 : gage 5619 <embed src="$codebase/$appletName.swf" quality="high" bgcolor="#869ca7"
574 :     width="$width" height="$height" name="$appletName" align="middle" id="$appletName"
575 :     play="true" loop="false" quality="high" allowScriptAccess="sameDomain"
576 :     type="application/x-shockwave-flash"
577 : gage 5624 pluginspage="http://www.macromedia.com/go/getflashplayer"
578 :     FlashVars="$flashParameters">
579 : gage 5619 </embed>
580 :    
581 :     </object>
582 :     END_OBJECT_TEXT
583 :    
584 :     sub new {
585 :     my $class = shift;
586 :     $class -> SUPER::new( objectText => DEFAULT_OBJECT_TEXT(),
587 :     @_
588 :     );
589 :    
590 :     }
591 :    
592 :    
593 :     package JavaApplet;
594 :     @ISA = qw(Applet);
595 :    
596 :    
597 :    
598 :     =pod
599 :    
600 :     The secret to making this applet work with IE in addition to normal browsers
601 :     is the addition of the C(<form></form>) construct just before the object.
602 :    
603 :     For some reason IE has trouble locating a flash object which is contained
604 :     within a form. Adding this second blank form with the larger problemMainForm
605 :     seems to solve the problem.
606 :    
607 :     This follows method2 of the advice given in url(http://kb.adobe.com/selfservice/viewContent.do?externalId=kb400730&sliceId=2)
608 :     Method1 and methods involving SWFObject(Geoff Stearns) and SWFFormFix (Steve Kamerman) have yet to be fully investigated:
609 :     http://devel.teratechnologies.net/swfformfix/swfobject_swfformfix_source.js
610 :     http://www.teratechnologies.net/stevekamerman/index.php?m=01&y=07&entry=entry070101-033933
611 :    
612 :     use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
613 :     <form></form>
614 :     <applet
615 :     code = "$code"
616 :     codebase = "$codebase"
617 :     archive = "$archive"
618 :     name = "$appletName"
619 :     id = "$appletName"
620 :     width = "$width"
621 :     height = "$height"
622 :     MAYSCRIPT
623 :     >
624 : gage 5624 $javaParameters
625 : gage 5619 </applet>
626 :     END_OBJECT_TEXT
627 :    
628 :     =cut
629 :    
630 :     use constant DEFAULT_OBJECT_TEXT =><<'END_OBJECT_TEXT';
631 :     <form></form>
632 :     <applet
633 :     code = "$code"
634 :     codebase = "$codebase"
635 :     archive = "$archive"
636 :     name = "$appletName"
637 :     id = "$appletName"
638 :     width = "$width"
639 :     height = "$height"
640 :     MAYSCRIPT
641 :     >
642 : gage 5624 $javaParameters
643 : gage 5619 </applet>
644 :     END_OBJECT_TEXT
645 :    
646 :     sub new {
647 :     my $class = shift;
648 :     $class -> SUPER::new( objectText => DEFAULT_OBJECT_TEXT(),
649 :     @_
650 :     );
651 :    
652 :     }
653 :    
654 :    
655 :    
656 : gage 5574 1;

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