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Annotation of loncom/interface/lonmainmenu.pm, revision 1.14

1.1       albertel    1: # The LearningOnline Network with CAPA
                      2: # displays the main menu
                      3: #
1.14    ! raeburn     4: # $Id: lonmainmenu.pm,v 1.13 2021/06/07 06:05:49 raeburn Exp $
1.1       albertel    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: # There are two parameters controlling the action of this module:
                     30: #
                     31: # browser.interface - if this is 'textual', it overrides the second parameter
                     32: # and goes to screen reader PDA mode
                     33: #
                     34: 
                     35: package Apache::lonmainmenu;
                     36: 
                     37: use strict;
1.11      musolffc   38: use Apache::Constants qw(:common REDIRECT);
1.1       albertel   39: use Apache::loncommon();
1.2       albertel   40: use Apache::lonnet;
                     41: use Apache::lonmenu();
1.13      raeburn    42: use Apache::lonlocal;
1.1       albertel   43: 
                     44: sub handler {
                     45:     my $r = shift;
1.11      musolffc   46: 
1.14    ! raeburn    47:     # Check for critical messages and redirect if present.
1.12      raeburn    48:     my ($redirect,$url) = &Apache::loncommon::critical_redirect(300,'menu');
1.11      musolffc   49:     if ($redirect) {
                     50:         &Apache::loncommon::content_type($r,'text/html');
                     51:         $r->header_out(Location => $url);
                     52:         return REDIRECT;
                     53:     }
                     54: 
1.1       albertel   55:     &Apache::loncommon::no_cache($r);
                     56:     &Apache::loncommon::content_type($r,'text/html');
                     57:     $r->send_http_header;
                     58:     return OK if $r->header_only;
                     59: 
                     60: # ---- Print the screen, pretend to be in text mode to generate text-based menu
1.8       www        61: # temporarily set interface to "faketextual" and remote to "off", which renders
                     62: # the main menu
1.7       www        63:     $env{'browser.interface'}='faketextual';
                     64: 
1.13      raeburn    65: #
1.14    ! raeburn    66: # If menu collection is in effect in course context, determine if Main Menu
        !            67: # will be shown.
1.13      raeburn    68: #
1.14    ! raeburn    69:     my $showmenu = 1;
        !            70:     my $deeplinkmenu;
1.13      raeburn    71:     if ($env{'request.course.id'}) {
1.14    ! raeburn    72:         (my $menucoll,$deeplinkmenu,my $menuref) =
1.13      raeburn    73:             &Apache::loncommon::menucoll_in_effect();
1.14    ! raeburn    74:         if (($menucoll) && (ref($menuref) eq 'HASH')) {
        !            75:             if ($menuref->{'main'} eq 'n') {
        !            76:                 $showmenu = 0;
        !            77:             }
        !            78:         }
        !            79:     }
        !            80:     my $js;
        !            81:     my $args = { 'bread_crumbs' => 1 };
        !            82:     if ($showmenu) {
        !            83:         $js = <<"END";
        !            84: <script type="text/javascript">
        !            85: // <![CDATA[
        !            86: function formatMenuText() {
        !            87:     var textArray = document.getElementsByClassName("LC_menu_text");
        !            88:     if (textArray.length > 0) {
        !            89:         var singleLineHeight = textArray[0].offsetHeight;
        !            90:         for (var i=1; i<textArray.length; i++) {
        !            91:             if (textArray[i].offsetHeight > singleLineHeight) {
        !            92:                 var el = textArray[i].previousElementSibling;
        !            93:                 el.style.cssFloat = "left";
        !            94:                 el.style.marginRight = "5px";
1.13      raeburn    95:             }
                     96:         }
                     97:     }
1.14    ! raeburn    98: }
        !            99: // ]]>
        !           100: </script>
        !           101: END
        !           102:         $args->{'add_entries'} = { 'onload' => 'javascript:formatMenuText();' };
        !           103:     }
        !           104: 
        !           105:     $r->print(&Apache::loncommon::start_page( 'Main Menu',$js,$args).
        !           106:               '<div class="LC_landmark" role="main">');
        !           107: #
        !           108: # If menu collection is in effect in course context, and Main Menu is 
        !           109: # not included, display message in place of usual menu items.
        !           110: #
        !           111:     unless ($showmenu) {
        !           112:         my $nomenumsg;
        !           113:         my $crstype = &Apache::loncommon::course_type();
        !           114:         if ($deeplinkmenu) {
        !           115:             $nomenumsg = &mt('Page unavailable');
        !           116:         } else {
        !           117:             $nomenumsg = &mt("Main Menu page is unavailable in this $crstype");
        !           118:         }
        !           119:         $r->print('<h1 class="LC_heading_3">'.$nomenumsg.'</h1>'.
        !           120:                   '</div>'.&Apache::loncommon::end_page());
        !           121:         return OK;
        !           122:     }
        !           123: #
        !           124: # A span with class of LC_menu_text needs to be first item with that class.
        !           125: # It will be used by formatMenuText() to determine the offsetHeight for a single line.
        !           126: #
        !           127:     $r->print('<span class="LC_menu_text">&nbsp;</span>'.
        !           128:               &Apache::lonmenu::inlinemenu().
        !           129:               '</div>'.&Apache::loncommon::end_page());
1.1       albertel  130:     return OK;
                    131: }
                    132: 
                    133: 
                    134: 1;
                    135: __END__
                    136: 
                    137: 
                    138: 
                    139: 
                    140: 
                    141: 
                    142: