--- loncom/interface/lonmainmenu.pm	2006/04/10 18:49:56	1.3
+++ loncom/interface/lonmainmenu.pm	2021/12/31 22:11:36	1.10.2.2.6.1
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # displays the main menu
 #
-# $Id: lonmainmenu.pm,v 1.3 2006/04/10 18:49:56 albertel Exp $
+# $Id: lonmainmenu.pm,v 1.10.2.2.6.1 2021/12/31 22:11:36 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -31,48 +31,62 @@
 # browser.interface - if this is 'textual', it overrides the second parameter
 # and goes to screen reader PDA mode
 #
-# environment.remote - if this is 'on', the routines controll the remote
-# control, otherwise they render the main window controls; ignored it
-# browser.interface is 'textual'
-#
 
 package Apache::lonmainmenu;
 
 use strict;
-use Apache::Constants qw(:common);
+use Apache::Constants qw(:common REDIRECT);
 use Apache::loncommon();
 use Apache::lonnet;
 use Apache::lonmenu();
+use Apache::lonlocal;
 
 sub handler {
     my $r = shift;
+
+    # Check for critical messages and redirect if present.
+    my ($redirect,$url) = &Apache::loncommon::critical_redirect(300,'menu');
+    if ($redirect) {
+        &Apache::loncommon::content_type($r,'text/html');
+        $r->header_out(Location => $url);
+        return REDIRECT;
+    }
+
     &Apache::loncommon::no_cache($r);
     &Apache::loncommon::content_type($r,'text/html');
     $r->send_http_header;
     return OK if $r->header_only;
 
-    my $form;
-    if ($env{'environment.remote'} ne 'off' &&
-	$env{'browser.interface'} ne 'textual') {
-	$form=&Apache::lonmenu::serverform();
-    }
-
-    my $script_tag;
-    if ($env{'environment.remote'} ne 'off') {
-        my $utility=&Apache::lonmenu::utilityfunctions('/adm/menu');
-        $script_tag=(<<ENDSCRIPT);
-<script type="text/javascript">
-$utility
-</script>
-ENDSCRIPT
-    }
 # ---- Print the screen, pretend to be in text mode to generate text-based menu
-    unless ($env{'browser.interface'} eq 'textual') {
-	$env{'browser.interface'}='faketextual';
-	$env{'environment.remote'}='off';
+# temporarily set interface to "faketextual" and remote to "off", which renders
+# the main menu
+    $env{'browser.interface'}='faketextual';
+    $env{'environment.remote'}='off';
+    $r->print(&Apache::loncommon::start_page( 'Main Menu',
+                                               undef,
+                                              {'bread_crumbs' => 1}));
+#
+# If menu collection is in effect in course context, and Main Menu is
+# not included, display message in place of usual menu items.
+#
+    if ($env{'request.course.id'}) {
+        my ($menucoll,$deeplinkmenu,$menuref) =
+            &Apache::loncommon::menucoll_in_effect();
+        if ($menucoll) {
+            if (ref($menuref) eq 'HASH') {
+                if ($menuref->{'main'} eq 'n') {
+                    $r->print('<h3>'.&mt('Main Menu unavailable').'</h3>');
+                    unless ($deeplinkmenu) {
+                        my $crstype = &Apache::loncommon::course_type();
+                        $r->print('<p>'.&mt("Main Menu page is unavailable in this $crstype").'</p>');
+                    }
+                    $r->print(&Apache::loncommon::end_page());
+                    return OK;
+                }
+            }
+        }
     }
-    $r->print(&Apache::loncommon::start_page('Main Menu',$script_tag));
-    $r->print('<table>'.&Apache::lonmenu::inlinemenu().'</table>'.$form);
+    $r->print(&Apache::lonmenu::inlinemenu());
     $r->print(&Apache::loncommon::end_page());
     return OK;
 }