--- rat/lonpageflip.pm 2000/10/11 21:16:29 1.6 +++ rat/lonpageflip.pm 2002/05/23 15:07:55 1.25 @@ -2,6 +2,30 @@ # # Page flip handler # +# $Id: lonpageflip.pm,v 1.25 2002/05/23 15:07:55 www Exp $ +# +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# # (Page Handler # # (TeX Content Handler @@ -10,7 +34,9 @@ # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, # 10/02 Gerd Kortemeyer) # -# 10/03,10/05,10/06,10/07,10/09,10/10,10/11 Gerd Kortemeyer +# 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17, +# 11/14,11/16, +# 10/01/01,05/01,05/28,07/05 Gerd Kortemeyer package Apache::lonpageflip; @@ -37,47 +63,29 @@ sub addrid { return $current; } -# ================================================================ Main Handler - -sub handler { - my $r=shift; - -# ------------------------------------------- Set document type for header only +sub fullmove { + my ($rid,$mapurl,$direction)=@_; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', + &GDBM_READER,0640)) { + ($rid,$mapurl)=&move($rid,$mapurl,$direction); + untie(%hash); + } + return($rid,$mapurl); +} - if ($r->header_only) { - $r->content_type('text/html'); - $r->send_http_header; - return OK; - } +sub move { + my ($rid,$mapurl,$direction)=@_; + my $startoutrid=$rid; - my %cachehash=(); - my $multichoice=0; - my %multichoicehash=(); - my $redirecturl=''; - my $next=''; - my @possibilities=(); + my $next=''; - if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { - $ENV{'form.postdata'}=~/(\w+)\:(.*)/; - my $direction=$1; - my $currenturl=$2; - $currenturl=~s/^http\:\/\///; - $currenturl=~s/^[^\/]+//; -# ------------------------------------------- Do we have any idea where we are? - my $position; - if ($position=Apache::lonnet::symbread($currenturl)) { -# ------------------------------------------------------------------------- Yes - my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); - $cachehash{$thisurl}=$mapnum; -# ============================================================ Tie the big hash - if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', - &GDBM_READER,0640)) { - my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum; - my $next=''; my $mincond=1; my $posnext=''; if ($direction eq 'forward') { # --------------------------------------------------------------------- Forward + if ($hash{'type_'.$rid} eq 'finish') { + $rid=$hash{'ids_/res/'.$mapurl}; + } map { my $thiscond= &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); @@ -97,8 +105,23 @@ sub handler { $hash{'condid_'.$hash{'undercond_'.$linkid}}); } } split(/\,/,$posnext); + if ($hash{'is_map_'.$next}) { +# This jumps to the beginning of a new map (going down level) + if ( + $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { + $mapurl=$hash{'src_'.$next}; + $next=$hash{'map_start_'.$hash{'src_'.$next}}; + } + } elsif + ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { +# This comes up from a map (coming up one level); + $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; + } } elsif ($direction eq 'back') { # ------------------------------------------------------------------- Backwards + if ($hash{'type_'.$rid} eq 'start') { + $rid=$hash{'ids_/res/'.$mapurl}; + } map { my $thiscond= &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); @@ -118,18 +141,117 @@ sub handler { $hash{'condid_'.$hash{'undercond_'.$linkid}}); } } split(/\,/,$posnext); - } elsif ($direction eq 'up') { -# -------------------------------------------------------------------------- Up - } elsif ($direction eq 'down') { -# ------------------------------------------------------------------------ Down + if ($hash{'is_map_'.$next}) { +# This jumps to the end of a new map (going down one level) + if ( + $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { + $mapurl=$hash{'src_'.$next}; + $next=$hash{'map_finish_'.$hash{'src_'.$next}}; + } + } elsif + ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { +# This comes back up from a map (going up one level); + $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; + } + } + return ($next,$mapurl); +} + +# ================================================================ Main Handler + +sub handler { + my $r=shift; + +# ------------------------------------------- Set document type for header only + + if ($r->header_only) { + $r->content_type('text/html'); + $r->send_http_header; + return OK; + } + + my %cachehash=(); + my $multichoice=0; + my %multichoicehash=(); + my $redirecturl=''; + my $next=''; + my @possibilities=(); + if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { + $ENV{'form.postdata'}=~/(\w+)\:(.*)/; + my $direction=$1; + my $currenturl=$2; + if ($direction eq 'return') { +# -------------------------------------------------------- Return to last known + my $last; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', + &GDBM_READER,0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + my $newloc; + if ($last) { + $newloc='/res/'.(split(/\_\_\_/,$last))[1]; + } else { + $newloc='/adm/noidea.html'; + } + $r->content_type('text/html'); + $r->header_out(Location => + 'http://'.$ENV{'HTTP_HOST'}.$newloc); + + return REDIRECT; + } + $currenturl=~s/^http\:\/\///; + $currenturl=~s/^[^\/]+//; + unless (($currenturl=~/^\/res\//) || + ($currenturl=~/^\/adm\/wrapper\//)) { + my $last; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', + &GDBM_READER,0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + if ($last) { + $currenturl='/res/'.(split(/\_\_\_/,$last))[1]; + } else { + $r->content_type('text/html'); + $r->header_out(Location => + 'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html'); + return REDIRECT; + } + } +# ------------------------------------------- Do we have any idea where we are? + my $position; + if ($position=Apache::lonnet::symbread($currenturl)) { +# ------------------------------------------------------------------------- Yes + my ($startoutmap,$mapnum,$thisurl)=split(/\_\_\_/,$position); + $cachehash{$startoutmap}{$thisurl}=$mapnum; + $cachehash{$startoutmap}{'last_known'}= + &Apache::lonnet::declutter($currenturl); + +# ============================================================ Tie the big hash + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', + &GDBM_READER,0640)) { + my $rid=$hash{'map_pc_/res/'.$startoutmap}.'.'.$mapnum; + +# ------------------------------------------------- Move forward, backward, etc + my $endupmap; + ($next,$endupmap)=&move($rid,$startoutmap,$direction); +# -------------------------------------- Do we have one and only one empty URL? + my $safecount=0; + while (($next) && ($next!~/\,/) && (!$hash{'src_'.$next}) + && ($safecount<25)) { + ($next,$endupmap)=&move($next,$endupmap,$direction); + $safecount++; } +# We are now at at least one non-empty URL # ----------------------------------------------------- Check out possibilities if ($next) { @possibilities=split(/\,/,$next); if ($#possibilities==0) { # ---------------------------------------------- Only one possibility, redirect $redirecturl=$hash{'src_'.$next}; - $cachehash{&Apache::lonnet::declutter($redirecturl)} + $cachehash{$endupmap} + {&Apache::lonnet::declutter($redirecturl)} =(split(/\./,$next))[1]; } else { # ------------------------ There are multiple possibilities for a next resource @@ -138,12 +260,14 @@ sub handler { $multichoicehash{'src_'.$_}=$hash{'src_'.$_}; $multichoicehash{'title_'.$_}=$hash{'title_'.$_}; $multichoicehash{'type_'.$_}=$hash{'type_'.$_}; + my ($choicemap,$choiceres)=split(/\./,$_); $cachehash - {&Apache::lonnet::declutter( + {&Apache::lonnet::declutter($hash{'src_'.$choicemap})} + {&Apache::lonnet::declutter( $multichoicehash {'src_'.$_} )} - =(split(/\./,$_))[1]; + =$choiceres; } @possibilities; } } else { @@ -153,8 +277,10 @@ sub handler { # ----------------- The program must come past this point to untie the big hash untie(%hash); # --------------------------------------------------------- Store position info - $cachehash{'last_direction'}=$direction; - &Apache::lonnet::symblist($mapurl,%cachehash); + $cachehash{$startoutmap}{'last_direction'}=$direction; + foreach my $thismap (keys %cachehash) { + &Apache::lonnet::symblist($thismap,%{$cachehash{$thismap}}); + } # ============================================== Do not return before this line if ($redirecturl) { # ----------------------------------------------------- There is a URL to go to @@ -164,7 +290,44 @@ sub handler { return REDIRECT; } else { # --------------------------------------------------------- There was a problem - } + $r->content_type('text/html'); + $r->send_http_header; + if ($#possibilities>0) { + $r->print(<Choose Next Location + +

LON-CAPA

+There are several possibilities of where to go next. +

+Please click on the the resource you intend to access: +

+ + +ENDSTART + map { + $r->print( + ''); + } @possibilities; + $r->print('
TitleType
'. + $multichoicehash{'title_'.$_}. + ''.$multichoicehash{'type_'.$_}. + '
'); + return OK; + } else { + $r->print(<Choose Next Location + + +

Sorry!

+

Next resource could not be identified.

+

You probably are at the beginning or the end of the course.

+ + +ENDNONE + return OK; + } + } } else { # ------------------------------------------------- Problem, could not tie hash $ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";