1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavdisplay.pm,v 1.19 2010/12/07 01:15:39 www 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 Apache::londocs();
41: use Time::HiRes qw( gettimeofday tv_interval );
42:
43: sub handler {
44: my $r = shift;
45: real_handler($r);
46: }
47:
48: sub real_handler {
49: my $r = shift;
50: #my $t0=[&gettimeofday()];
51: # Handle header-only request
52: if ($r->header_only) {
53: if ($env{'browser.mathml'}) {
54: &Apache::loncommon::content_type($r,'text/xml');
55: } else {
56: &Apache::loncommon::content_type($r,'text/html');
57: }
58: $r->send_http_header;
59: return OK;
60: }
61:
62: # Send header, don't cache this page
63: if ($env{'browser.mathml'}) {
64: &Apache::loncommon::content_type($r,'text/xml');
65: } else {
66: &Apache::loncommon::content_type($r,'text/html');
67: }
68: &Apache::loncommon::no_cache($r);
69:
70: my %toplinkitems=();
71:
72: # Create the nav map
73: my $navmap = Apache::lonnavmaps::navmap->new();
74:
75: if (!defined($navmap)) {
76: my $requrl = $r->uri;
77: $env{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
78: $env{'user.reinit'} = 1;
79: return HTTP_NOT_ACCEPTABLE;
80: }
81: $r->send_http_header;
82:
83: # ------------------------------------------------------------ Get query string
84: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['sort','showOnlyHomework','postsymb','register']);
85:
86: # ----------------------------------------------------- Force menu registration
87: # Header
88: my $course_type = &Apache::loncommon::course_type();
89: my $title = $course_type . ' Contents';
90: my ($start_page,$args);
91: if ($env{'form.register'}) {
92: $args = {'force_register' => $env{'form.register'}};
93: $start_page = &Apache::loncommon::start_page($title,undef,$args);
94: } else {
95: my $brcrum = [{href => '/adm/navmaps',
96: text => &mt($course_type . ' Contents'),
97: no_mt => 1},
98: ];
99: $args = {'bread_crumbs' => $brcrum};
100: $start_page = &Apache::loncommon::start_page($title,undef,$args);
101: }
102: $r->print($start_page.
103: '<script type="text/javascript">window.focus();</script>');
104: &Apache::londocs::startContentScreen($r,'navmaps');
105: $r->rflush();
106:
107: # Check that it's defined
108: if (!($navmap->courseMapDefined())) {
109: $r->print(&Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT'));
110: $r->print('<span class="LC_error">'.&mt('Coursemap undefined.').
111: '</span>' .
112: &Apache::loncommon::end_page());
113: return OK;
114: }
115:
116: # See if there's only one map in the top-level, if we don't
117: # already have a filter... if so, automatically display it
118: # (older code; should use retrieveResources)
119: if ($ENV{QUERY_STRING} !~ /filter/) {
120: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
121: my $curRes;
122: my $sequenceCount = 0;
123: my $sequenceId;
124: while ($curRes = $iterator->next()) {
125: if (ref($curRes) && $curRes->is_sequence()) {
126: $sequenceCount++;
127: $sequenceId = $curRes->map_pc();
128: }
129: }
130:
131: if ($sequenceCount == 1) {
132: # The automatic iterator creation in the render call
133: # will pick this up. We know the condition because
134: # the defined($env{'form.filter'}) also ensures this
135: # is a fresh call.
136: $env{'form.filter'} = "$sequenceId";
137: }
138: }
139:
140: # Check to see if the student is jumping to next open, do-able problem
141: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
142: # Find the next homework problem that they can do.
143: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
144: my $curRes;
145: my $foundDoableProblem = 0;
146: my $minimumduedate;
147: my $now = time();
148:
149: while ($curRes = $iterator->next()) {
150: if (ref($curRes) && $curRes->is_problem()) {
151: my $status = $curRes->status();
152: my $thisduedate=$curRes->duedate();
153: if ($thisduedate > $now
154: && $curRes->completable()) {
155:
156: $foundDoableProblem = 1;
157:
158: if (!defined($minimumduedate)
159: || $thisduedate<$minimumduedate) {
160: # Pop open all previous maps
161: my $stack = $iterator->getStack();
162: pop @$stack; # last resource in the stack is the problem
163: # itself, which we don't need in the map stack
164: my @mapPcs = map {$_->map_pc()} @$stack;
165: $env{'form.filter'} = join(',', @mapPcs);
166:
167: # Mark as both "here" and "jump"
168: $env{'form.postsymb'} = $curRes->symb();
169: $minimumduedate=$thisduedate;
170: }
171: }
172: }
173: }
174:
175: # If we found no problems, print a note to that effect.
176: if (!$foundDoableProblem) {
177: $r->print("<span class=\"LC_info\">"
178: .&mt("All homework assignments have been completed.")
179: ."</span>");
180: }
181: } else {
182: my $link = 'navmaps?jumpToFirstHomework';
183: if ($env{'form.register'}) {
184: $link .= '&register='.$env{'form.register'};
185: }
186: &Apache::lonnavmaps::add_linkitem(\%toplinkitems,'firsthomework',
187: 'location.href="'.$link.'"',
188: "Show my first due problem");
189: }
190:
191: my $suppressEmptySequences = 0;
192: my $filterFunc = undef;
193: my $resource_no_folder_link = 0;
194:
195: # Display only due homework.
196: my $showOnlyHomework = 0;
197: if ($env{'form.showOnlyHomework'} eq "1") {
198: $showOnlyHomework = 1;
199: $suppressEmptySequences = 1;
200: $filterFunc = sub { my $res = shift;
201: return $res->completable() || $res->is_map();
202: };
203: my $link = 'navmaps?sort='.$env{'form.sort'};
204: if ($env{'form.register'}) {
205: $link .= '&register='.$env{'form.register'};
206: }
207: &Apache::lonnavmaps::add_linkitem(\%toplinkitems,'everything',
208: 'location.href="'.$link.'"',
209: 'Show everything');
210: $r->print("<span class=\"LC_info\">".&mt("Uncompleted Problems")."</span>");
211: $env{'form.filter'} = '';
212: $env{'form.condition'} = 1;
213: $resource_no_folder_link = 1;
214: } else {
215: my $link = 'navmaps?sort='.$env{'form.sort'}.'&showOnlyHomework=1';
216: if ($env{'form.register'}) {
217: $link .= '&register='.$env{'form.register'};
218: }
219: &Apache::lonnavmaps::add_linkitem(\%toplinkitems,'uncompleted',
220: 'location.href="'.$link.'"',
221: 'Show only uncompleted problems');
222: }
223:
224: my %selected=($env{'form.sort'} => ' selected="selected"');
225: my $sort_html=('<form name="sortForm" action="">
226: <span class="LC_nobreak">
227: <input type="hidden" name="showOnlyHomework" value="'.$env{'form.showOnlyHomework'}.'" />
228: '.&mt('Sort by:').'
229: <select name="sort" onchange="document.sortForm.submit()">
230: <option value="default"'.$selected{'default'}.'>'.&mt('Default').'</option>
231: <option value="title"'.$selected{'title'}.'>'.&mt('Title').'</option>
232: <option value="duedate"'.$selected{'duedate'}.'>'.&mt('Duedate').'</option>
233: <option value="discussion"'.$selected{'discussion'}.'>'.&mt('Has New Discussion').'</option>
234: </select>
235: <input type="hidden" name="register" value="'.$env{'form.register'}.'" />
236: </span>
237: </form>');
238: # renderer call
239: my $renderArgs = { 'cols' => [0,1,2,3],
240: 'sort' => $env{'form.sort'},
241: 'url' => '/adm/navmaps',
242: 'navmap' => $navmap,
243: 'suppressNavmap' => 1,
244: 'suppressEmptySequences' => $suppressEmptySequences,
245: 'filterFunc' => $filterFunc,
246: 'resource_no_folder_link' => $resource_no_folder_link,
247: 'sort_html'=> $sort_html,
248: 'r' => $r,
249: 'caller' => 'navmapsdisplay',
250: 'linkitems' => \%toplinkitems};
251: my $render = &Apache::lonnavmaps::render($renderArgs);
252:
253: # If no resources were printed, print a reassuring message so the
254: # user knows there was no error.
255: if ($renderArgs->{'counter'} == 0) {
256: if ($showOnlyHomework) {
257: $r->print("<p><span class=\"LC_info\">".&mt("All homework is currently completed.")."</span></p>");
258: } else { # both jumpToFirstHomework and normal use the same: course must be empty
259: $r->print("<p><span class=\"LC_info\">".&mt("This course is empty.")."</span></p>");
260: }
261: }
262: #my $td=&tv_interval($t0);
263: #$r->print("<br />$td");
264: &Apache::londocs::endContentScreen($r);
265: $r->print(&Apache::loncommon::end_page());
266: $r->rflush();
267:
268: return OK;
269: }
270:
271: 1;
272: __END__
273:
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