1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavdisplay.pm,v 1.15 2010/03/16 19:55:49 droeschl Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonnavdisplay;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::lonmenu();
35: use Apache::loncommon();
36: use Apache::lonnavmaps();
37: use Apache::lonhtmlcommon();
38: use Apache::lonnet;
39: use Apache::lonlocal;
40: use Time::HiRes qw( gettimeofday tv_interval );
41:
42: sub handler {
43: my $r = shift;
44: real_handler($r);
45: }
46:
47: sub real_handler {
48: my $r = shift;
49: #my $t0=[&gettimeofday()];
50: # Handle header-only request
51: if ($r->header_only) {
52: if ($env{'browser.mathml'}) {
53: &Apache::loncommon::content_type($r,'text/xml');
54: } else {
55: &Apache::loncommon::content_type($r,'text/html');
56: }
57: $r->send_http_header;
58: return OK;
59: }
60:
61: # Send header, don't cache this page
62: if ($env{'browser.mathml'}) {
63: &Apache::loncommon::content_type($r,'text/xml');
64: } else {
65: &Apache::loncommon::content_type($r,'text/html');
66: }
67: &Apache::loncommon::no_cache($r);
68:
69: my %toplinkitems=();
70: &Apache::lonnavmaps::add_linkitem(\%toplinkitems,'blank','',
71: "Select Action");
72:
73: # Create the nav map
74: my $navmap = Apache::lonnavmaps::navmap->new();
75:
76: if (!defined($navmap)) {
77: my $requrl = $r->uri;
78: $env{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
79: $env{'user.reinit'} = 1;
80: return HTTP_NOT_ACCEPTABLE;
81: }
82: $r->send_http_header;
83:
84: # ------------------------------------------------------------ Get query string
85: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework','postsymb']);
86:
87: # ----------------------------------------------------- Force menu registration
88: # Header
89: my $course_type = &Apache::loncommon::course_type();
90: my $title = $course_type . ' Contents';
91: my $breadcrumb_text = mt($course_type . ' Contents');
92: $r->print(&Apache::loncommon::start_page($title, '',
93: { 'force_register' => $env{'form.register'},
94: 'bread_crumbs' => [{text => $breadcrumb_text }],}));
95: #SD
96: $r->print('<script type="text/javascript">window.focus();</script>');
97:
98: $r->rflush();
99:
100: # Check that it's defined
101: if (!($navmap->courseMapDefined())) {
102: $r->print(&Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT'));
103: $r->print('<span class="LC_error">'.&mt('Coursemap undefined.').
104: '</span>' .
105: &Apache::loncommon::end_page());
106: return OK;
107: }
108:
109: # See if there's only one map in the top-level, if we don't
110: # already have a filter... if so, automatically display it
111: # (older code; should use retrieveResources)
112: if ($ENV{QUERY_STRING} !~ /filter/) {
113: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
114: my $curRes;
115: my $sequenceCount = 0;
116: my $sequenceId;
117: while ($curRes = $iterator->next()) {
118: if (ref($curRes) && $curRes->is_sequence()) {
119: $sequenceCount++;
120: $sequenceId = $curRes->map_pc();
121: }
122: }
123:
124: if ($sequenceCount == 1) {
125: # The automatic iterator creation in the render call
126: # will pick this up. We know the condition because
127: # the defined($env{'form.filter'}) also ensures this
128: # is a fresh call.
129: $env{'form.filter'} = "$sequenceId";
130: }
131: }
132:
133: # Check to see if the student is jumping to next open, do-able problem
134: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
135: # Find the next homework problem that they can do.
136: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
137: my $curRes;
138: my $foundDoableProblem = 0;
139: my $minimumduedate;
140: my $now = time();
141:
142: while ($curRes = $iterator->next()) {
143: if (ref($curRes) && $curRes->is_problem()) {
144: my $status = $curRes->status();
145: my $thisduedate=$curRes->duedate();
146: if ($thisduedate > $now
147: && $curRes->completable()) {
148:
149: $foundDoableProblem = 1;
150:
151: if (!defined($minimumduedate)
152: || $thisduedate<$minimumduedate) {
153: # Pop open all previous maps
154: my $stack = $iterator->getStack();
155: pop @$stack; # last resource in the stack is the problem
156: # itself, which we don't need in the map stack
157: my @mapPcs = map {$_->map_pc()} @$stack;
158: $env{'form.filter'} = join(',', @mapPcs);
159:
160: # Mark as both "here" and "jump"
161: $env{'form.postsymb'} = $curRes->symb();
162: $minimumduedate=$thisduedate;
163: }
164: }
165: }
166: }
167:
168: # If we found no problems, print a note to that effect.
169: if (!$foundDoableProblem) {
170: $r->print("<span class=\"LC_info\">"
171: .&mt("All homework assignments have been completed.")
172: ."</span>");
173: }
174: } else {
175: &Apache::lonnavmaps::add_linkitem(\%toplinkitems,'firsthomework',
176: 'location.href="navmaps?jumpToFirstHomework"',
177: "Show my first due problem");
178: }
179:
180: my $suppressEmptySequences = 0;
181: my $filterFunc = undef;
182: my $resource_no_folder_link = 0;
183:
184: # Display only due homework.
185: my $showOnlyHomework = 0;
186: if ($env{'form.showOnlyHomework'} eq "1") {
187: $showOnlyHomework = 1;
188: $suppressEmptySequences = 1;
189: $filterFunc = sub { my $res = shift;
190: return $res->completable() || $res->is_map();
191: };
192: &Apache::lonnavmaps::add_linkitem(\%toplinkitems,'everything',
193: 'location.href="navmaps?sort='.$env{'form.sort'}.'"',
194: "Show everything");
195: $r->print("<span class=\"LC_info\">".&mt("Uncompleted Problems")."</span>");
196: $env{'form.filter'} = '';
197: $env{'form.condition'} = 1;
198: $resource_no_folder_link = 1;
199: } else {
200: &Apache::lonnavmaps::add_linkitem(\%toplinkitems,'uncompleted',
201: 'location.href="navmaps?sort='.$env{'form.sort'}.
202: '&showOnlyHomework=1"',
203: "Show only uncompleted problems");
204: }
205:
206: my %selected=($env{'form.sort'} => ' selected="selected"');
207: my $sort_html=("<form name=\"sortForm\">
208: <span class=\"LC_nobreak\">
209: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$env{'form.showOnlyHomework'}."\" />
210: ".&mt('Sort by:')."
211: <select name=\"sort\" onChange=\"document.sortForm.submit()\">
212: <option value=\"default\"$selected{'default'}>".&mt('Default')."</option>
213: <option value=\"title\"$selected{'title'} >".&mt('Title')."</option>
214: <option value=\"duedate\"$selected{'duedate'}>".&mt('Duedate')."</option>
215: <option value=\"discussion\"$selected{'discussion'}>".&mt('Has New Discussion')."</option>
216: </select>
217: </span>
218: </form>");
219: # renderer call
220: my $renderArgs = { 'cols' => [0,1,2,3],
221: 'sort' => $env{'form.sort'},
222: 'url' => '/adm/navmaps',
223: 'navmap' => $navmap,
224: 'suppressNavmap' => 1,
225: 'suppressEmptySequences' => $suppressEmptySequences,
226: 'filterFunc' => $filterFunc,
227: 'resource_no_folder_link' => $resource_no_folder_link,
228: 'sort_html'=> $sort_html,
229: 'r' => $r,
230: 'caller' => 'navmapsdisplay',
231: 'linkitems' => \%toplinkitems};
232: my $render = &Apache::lonnavmaps::render($renderArgs);
233:
234: # If no resources were printed, print a reassuring message so the
235: # user knows there was no error.
236: if ($renderArgs->{'counter'} == 0) {
237: if ($showOnlyHomework) {
238: $r->print("<p><span class=\"LC_info\">".&mt("All homework is currently completed.")."</span></p>");
239: } else { # both jumpToFirstHomework and normal use the same: course must be empty
240: $r->print("<p><span class=\"LC_info\">".&mt("This course is empty.")."</span></p>");
241: }
242: }
243: #my $td=&tv_interval($t0);
244: #$r->print("<br />$td");
245:
246: $r->print(&Apache::loncommon::end_page());
247: $r->rflush();
248:
249: return OK;
250: }
251:
252: 1;
253: __END__
254:
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