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Diff for /loncom/interface/lonnavmaps.pm between versions 1.88 and 1.97

version 1.88, 2002/10/28 19:10:35 version 1.97, 2002/11/03 21:05:03
Line 820  sub new_handle { Line 820  sub new_handle {
     &Apache::loncommon::no_cache($r);      &Apache::loncommon::no_cache($r);
     $r->send_http_header;      $r->send_http_header;
   
     # Initialize the nav map      # Create the nav map the nav map
     my $navmap = Apache::lonnavmaps::navmap->new(      my $navmap = Apache::lonnavmaps::navmap->new(
                         $ENV{"request.course.fn"}.".db",                          $ENV{"request.course.fn"}.".db",
                         $ENV{"request.course.fn"}."_parms.db", 1, 1);                          $ENV{"request.course.fn"}."_parms.db", 1, 1);
Line 837  sub new_handle { Line 837  sub new_handle {
                                           ''));                                            ''));
     $r->print('<script>window.focus();</script>');      $r->print('<script>window.focus();</script>');
     my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};      my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
     if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }      $r->print('<table border="0" cellpadding="2" cellspacing="0">');
     my $date=localtime;      my $date=localtime;
     $r->print("<h3>$date</h3>\n");      $r->print('<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>');
     $r->rflush();  
     if ($navmap->{LAST_CHECK}) {      if ($navmap->{LAST_CHECK}) {
         $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.          $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.
                     '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
                   strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).                    strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>');                     '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
                     '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
                     '</td>'); 
     } else {      } else {
         $r->print('<img src="/adm/lonMisc/chat.gif"> Discussions'.          $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.
                   '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>');                     '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
                     '&nbsp;&nbsp;<img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
                     '</td>'); 
       }
       $r->print('</tr></table>');
       my $condition = 0;
       if ($ENV{'form.condition'}) {
           $condition = 1;
     }      }
   
       if ($condition) {
           $r->print('<a href="navmaps?condition=0&filter=">Close All Folders</a>');
       } else {
           $r->print('<a href="navmaps?condition=1&filter=">Open All Folders</a>');
       }
   
       $r->print('<br>&nbsp;');
       $r->rflush();
   
       # Now that we've displayed some stuff to the user, init the navmap
       $navmap->init();
   
     # Check that it's defined      # Check that it's defined
     if (!($navmap->courseMapDefined())) {      if (!($navmap->courseMapDefined())) {
         $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .          $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
Line 926  sub new_handle { Line 947  sub new_handle {
     my $queryAdd = "postdata=" . &Apache::lonnet::escape($currenturl) .      my $queryAdd = "postdata=" . &Apache::lonnet::escape($currenturl) .
         "&alreadyHere=1";          "&alreadyHere=1";
   
     $r->print('<a href="navmaps?condition=1&filter=">Show All Resources</a><br /><br />');  
   
     # Begin the HTML table      # Begin the HTML table
     # four cols: resource + indent, chat+feedback, icon, text string      # four cols: resource + indent, chat+feedback, icon, text string
     $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");      $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
   
     my $condition = 0;  
     if ($ENV{'form.condition'}) {  
         $condition = 1;  
     }  
   
     # This needs to be updated to use symbs from the remote,       # This needs to be updated to use symbs from the remote, 
     # instead of uris. The changes to this and the main rendering      # instead of uris. The changes to this and the main rendering
     # loop should be obvious.      # loop should be obvious.
     # Here's a simple example of the iterator.      # Here's a simple example of the iterator.
     # Preprocess the map: Look for current URL, force inlined maps to display      # Preprocess the map: Look for current URL, force inlined maps to display
   
       # This currently does very little...
       my $mapEventualIterator = Apache::lonnavmaps::iterator->new($navmap, undef, undef, {},
                                                                   undef, $condition);
   
     my $mapIterator = $navmap->getIterator(undef, undef, {}, 1);      my $mapIterator = $navmap->getIterator(undef, undef, {}, 1);
     my $found = 0;      my $found = 0;
     my $depth = 1;      my $depth = 1;
       my $currentUrlIndex = 0; # keeps track of when the current resource is found,
                                # so we can back up a few and put the anchor above the
                                # current resource
     $mapIterator->next(); # discard the first BEGIN_MAP      $mapIterator->next(); # discard the first BEGIN_MAP
     my $curRes = $mapIterator->next();      my $curRes = $mapIterator->next();
       my $counter = 0;
           
     while ($depth > 0) {      while ($depth > 0) {
         if ($curRes == $mapIterator->BEGIN_MAP()) {          if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
             $depth++;          if ($curRes == $mapIterator->END_MAP()) { $depth--; }
         }  
         if ($curRes == $mapIterator->END_MAP()) {          if (ref($curRes)) { $counter++; }
             $depth--;  
         }  
   
         my $mapStack = $mapIterator->getStack();          my $mapStack = $mapIterator->getStack();
         if ($currenturl && !$ENV{'form.alreadyHere'} && ref($curRes) &&           if ($currenturl && !$ENV{'form.alreadyHere'} && ref($curRes) && 
Line 963  sub new_handle { Line 983  sub new_handle {
             # If this is the correct resource, be sure to               # If this is the correct resource, be sure to 
             # show it by making sure the containing maps              # show it by making sure the containing maps
             # are open.              # are open.
   
               $currentUrlIndex = $counter;
                           
             for my $map (@{$mapStack}) {              for my $map (@{$mapStack}) {
                 if ($condition) {                  if ($condition) {
Line 995  sub new_handle { Line 1017  sub new_handle {
     my $isNewBranch = 0;      my $isNewBranch = 0;
     my $now = time();      my $now = time();
     my $in24Hours = $now + 24 * 60 * 60;      my $in24Hours = $now + 24 * 60 * 60;
     my $depth = 1;  
     my $displayedHereMarker = 0;      my $displayedHereMarker = 0;
           
     # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"      # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
     # code in iterator->next), so ignore the first one      # code in iterator->next), so ignore the first one
     my $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,      $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
                                            $condition);                                             $condition);
     $mapIterator->next();      $mapIterator->next();
     my $curRes = $mapIterator->next();      $curRes = $mapIterator->next();
     my $deltadepth = 0;      my $deltadepth = 0;
       $depth = 1;
   
     my @backgroundColors = ("#FFFFFF", "#F6F6F6");      my @backgroundColors = ("#FFFFFF", "#F6F6F6");
     my $rowNum = 0;      my $rowNum = 0;
   
       $counter = 0;
   
     while ($depth > 0) {      while ($depth > 0) {
         # If we're in a new style course, and this is a BEGIN_MAP, END_MAP, or          # If we're in a new style course, and this is a BEGIN_MAP, END_MAP, or
         # map resource and the stack depth is only one, just plain ignore this resource          # map resource and the stack depth is only one, just plain ignore this resource
Line 1034  sub new_handle { Line 1058  sub new_handle {
         if ($curRes == $mapIterator->BEGIN_BRANCH()) {          if ($curRes == $mapIterator->BEGIN_BRANCH()) {
             $isNewBranch = 1;              $isNewBranch = 1;
         }          }
         if ($curRes == $mapIterator->BEGIN_MAP()) {          if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
             $depth++;          if ($curRes == $mapIterator->END_MAP()) { $depth--; }
         }  
         if ($curRes == $mapIterator->END_MAP()) {          if (ref($curRes)) { $counter++; }
             $depth--;  
         }  
   
         if ($depth == 1) { $deltadepth = 0; } # we're done shifting, because we're          if ($depth == 1) { $deltadepth = 0; } # we're done shifting, because we're
                                               # out of the inlined map                                                # out of the inlined map
Line 1231  sub new_handle { Line 1253  sub new_handle {
                 $rowNum++;                  $rowNum++;
                 my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];                  my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
   
                 # FIRST COL: The resource indentation, branch icon, and name                  # FIRST COL: The resource indentation, branch icon, name, and anchor
                 $r->print("  <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\" width=\"60%\">\n");                  $r->print("  <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\" width=\"60%\">\n");
   
                   # anchor for current resource... - 5 is deliberate: If it's that
                   # high on the screen, don't bother focusing on it. Also this will
                   # print multiple anchors if this is an expanded multi-part problem...
                   # who cares?
                   if ($counter == $currentUrlIndex - 5) {
                       $r->print('<a name="current" />');
                   }
   
                 # print indentation                  # print indentation
                 for (my $i = 0; $i < $indentLevel - $deltalevel + $deltadepth; $i++) {                  for (my $i = 0; $i < $indentLevel - $deltalevel + $deltadepth; $i++) {
                     $r->print($indentString);                      $r->print($indentString);
Line 1260  sub new_handle { Line 1290  sub new_handle {
                 }                  }
   
                 $r->print("  $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");                  $r->print("  $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
                   $r->print(" TDV:" . $curRes->{DATA}->{TOP_DOWN_VAL}); # temp
                   $r->print(" BUV:" . $curRes->{DATA}->{BOT_UP_VAL}); # temp
                   $r->print(" DD:" . $curRes->{DATA}->{DISPLAY_DEPTH}); # temp
   
                 if ($curRes->{RESOURCE_ERROR}) {                  if ($curRes->{RESOURCE_ERROR}) {
                     $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",                      $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
Line 1616  sub new { Line 1649  sub new {
     $self->{PARM_HASH} = \%parmhash;      $self->{PARM_HASH} = \%parmhash;
     $self->{HASH_TIED} = 1;      $self->{HASH_TIED} = 1;
   
       bless($self);
           
       return $self;
   }
   
   sub init {
       my $self = shift;
   
     # If the course opt hash and the user opt hash should be generated,      # If the course opt hash and the user opt hash should be generated,
     # generate them      # generate them
     if ($self->{GENERATE_COURSE_USER_OPT}) {      if ($self->{GENERATE_COURSE_USER_OPT}) {
Line 1720  sub new { Line 1761  sub new {
     }          }    
   
     $self->{PARM_CACHE} = {};      $self->{PARM_CACHE} = {};
       
     bless($self);  
           
     return $self;  
 }  }
   
 # Checks to see if coursemap is defined, matching test in old lonnavmaps  # Checks to see if coursemap is defined, matching test in old lonnavmaps
Line 1738  sub courseMapDefined { Line 1775  sub courseMapDefined {
   
 sub getIterator {  sub getIterator {
     my $self = shift;      my $self = shift;
     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,      my $iterator = Apache::lonnavmaps::DFSiterator->new($self, shift, shift,
                                                      shift, undef, shift);                                                       shift, undef, shift, 
                                                        $ENV{'form.direction'});
     return $iterator;      return $iterator;
 }  }
   
Line 1963  getIterator behaves as follows: Line 2001  getIterator behaves as follows:
   
 =over 4  =over 4
   
 =item B<getIterator>(firstResource, finishResource, filterHash, condition): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0, which is to say, do not recurse unless explicitly asked to.  =item B<getIterator>(firstResource, finishResource, filterHash, condition, direction): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0, which is to say, do not recurse unless explicitly asked to. Direction specifies which direction to recurse, either FORWARD or BACKWARD, with FORWARD being default.
   
 Thus, by default, all resources will be shown. Change the condition to a 1 without changing the hash, and only the top level of the map will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively examine parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively ignore parts of the nav map. See the handler code for examples: By default, the condition is 0 and all folders are closed unless explicitly opened. Clicking "Show All Resources" will use a condition of 1 and an empty filterHash, resulting in all resources being shown.  Thus, by default, all resources will be shown. Change the condition to a 1 without changing the hash, and only the top level of the map will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively examine parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively ignore parts of the nav map. See the handler code for examples: By default, the condition is 0 and all folders are closed unless explicitly opened. Clicking "Show All Resources" will use a condition of 1 and an empty filterHash, resulting in all resources being shown.
   
Line 1993  sub BEGIN_MAP { return 1; }    # beginin Line 2031  sub BEGIN_MAP { return 1; }    # beginin
 sub END_MAP { return 2; }      # end of the map  sub END_MAP { return 2; }      # end of the map
 sub BEGIN_BRANCH { return 3; } # beginning of a branch  sub BEGIN_BRANCH { return 3; } # beginning of a branch
 sub END_BRANCH { return 4; }   # end of a branch  sub END_BRANCH { return 4; }   # end of a branch
   sub FORWARD { return 1; }      # go forward
   sub BACKWARD { return 2; }
   
   sub min {
       (my $a, my $b) = @_;
       if ($a < $b) { return $a; } else { return $b; }
   }
   
   sub new {
       # magic invocation to create a class instance
       my $proto = shift;
       my $class = ref($proto) || $proto;
       my $self = {};
   
       $self->{NAV_MAP} = shift;
       return undef unless ($self->{NAV_MAP});
   
       # Handle the parameters
       $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
       $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
   
       # If the given resources are just the ID of the resource, get the
       # objects
       if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
       if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
   
       $self->{FILTER} = shift;
   
       # A hash, used as a set, of resource already seen
       $self->{ALREADY_SEEN} = shift;
       if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
       $self->{CONDITION} = shift;
   
       # Now, we need to pre-process the map, by walking forward and backward
       # over the parts of the map we're going to look at.
   
       # The processing steps are exactly the same, except for a few small 
       # changes, so I bundle those up in the following list of two elements:
       # (direction_to_iterate, VAL_name, next_resource_method_to_call,
       # first_resource).
       # This prevents writing nearly-identical code twice.
       my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', 
                           'FIRST_RESOURCE'],
                          [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', 
                           'FINISH_RESOURCE'] );
   
       foreach my $pass (@iterations) {
           my $direction = $pass->[0];
           my $valName = $pass->[1];
           my $nextResourceMethod = $pass->[2];
           my $firstResourceName = $pass->[3];
   
           my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, 
                                                               $self->{FIRST_RESOURCE},
                                                               $self->{FINISH_RESOURCE},
                                                               {}, undef, 0, $direction);
       
           # prime the recursion
           $self->{$firstResourceName}->{DATA}->{$valName} = 0;
           my $depth = 1;
           $iterator->next();
           my $curRes = $iterator->next();
           while ($depth > 0) {
               if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
               if ($curRes == $iterator->END_MAP()) { $depth--; }
           
               if (ref($curRes)) {
                   my $resultingVal = $curRes->{DATA}->{$valName};
                   my $nextResources = $curRes->$nextResourceMethod();
                   my $resourceCount = scalar(@{$nextResources});
               
                   if ($resourceCount == 1) {
                       my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                       $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                   }
                   
                   if ($resourceCount > 1) {
                       foreach my $res (@{$nextResources}) {
                           my $current = $res->{DATA}->{$valName} || 999999999;
                           $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
                       }
                   }
               }
               if (ref($curRes) && $curRes->is_map() && $direction == FORWARD()) {
                   my $firstResource = $curRes->map_start();
                   my $finishResource = $curRes->map_finish();
                   my $newIterator = Apache::lonnavmaps::iterator->new($self->{NAV_MAP},
                                                                       $firstResource,
                                                                       $finishResource,
                                                                       $self->{FILTER},
                                                                       $self->{ALREADY_SEEN},
                                                                       $self->{CONDITION});
               }
               
               # Assign the final val
               if (ref($curRes) && $direction == BACKWARD()) {
                   $curRes->{DATA}->{DISPLAY_DEPTH} = min($curRes->{DATA}->{TOP_DOWN_VAL},
                                                          $curRes->{DATA}->{BOT_UP_VAL});
               }
               $curRes = $iterator->next();
           }
       }
   
       # Now we're ready to start iterating.
   }
   
   1;
   
   package Apache::lonnavmaps::DFSiterator;
   
   # UNDOCUMENTED: This is a private library, it should not generally be used
   # by the outside world. What it does is walk through the nav map in a 
   # depth-first fashion. This is not appropriate for most uses, but it is
   # used by the main iterator for pre-processing. It also is able to isolate
   # much of the complexity of the main iterator, so the main iterator is much
   # simpler.
   # There is no real benefit in merging the main iterator and this one into one class...
   # all the logic in DFSiterator would need to be replicated, you gain no performance,
   # at best, you just make one massively complicated iterator in place of two 
   # somewhat complicated ones. ;-) - Jeremy
   
   # Here are the tokens for the iterator, replicated from iterator for convenience:
   
   sub BEGIN_MAP { return 1; }    # begining of a new map
   sub END_MAP { return 2; }      # end of the map
   sub BEGIN_BRANCH { return 3; } # beginning of a branch
   sub END_BRANCH { return 4; }   # end of a branch
   sub FORWARD { return 1; }      # go forward
   sub BACKWARD { return 2; }
   
 # Params: nav map, start resource, end resource, filter, condition,   # Params: nav map, start resource, end resource, filter, condition, 
 # already seen hash ref  # already seen hash ref
Line 2023  sub new { Line 2192  sub new {
     $self->{ALREADY_SEEN} = shift;      $self->{ALREADY_SEEN} = shift;
     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
     $self->{CONDITION} = shift;      $self->{CONDITION} = shift;
       $self->{DIRECTION} = shift || FORWARD();
   
     # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.      # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.
     $self->{STARTED} = 0;      $self->{STARTED} = 0;
Line 2047  sub new { Line 2217  sub new {
     $self->{FORCE_NEXT} = undef;      $self->{FORCE_NEXT} = undef;
   
     # Start with the first resource      # Start with the first resource
     push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};      if ($self->{DIRECTION} == FORWARD) {
           push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};
       } else {
           push @{$self->{BRANCH_STACK}}, $self->{FINISH_RESOURCE};
       }
     $self->{BRANCH_STACK_SIZE} = 1;      $self->{BRANCH_STACK_SIZE} = 1;
   
     bless($self);      bless($self);
Line 2144  sub next { Line 2318  sub next {
     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;      $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
           
     # Get the next possible resources      # Get the next possible resources
     my $nextUnfiltered = $self->{HERE}->getNext();      my $nextUnfiltered;
       if ($self->{DIRECTION} == FORWARD()) {
           $nextUnfiltered = $self->{HERE}->getNext();
       } else {
           $nextUnfiltered = $self->{HERE}->getPrevious();
       }
     my $next = [];      my $next = [];
   
     # filter the next possibilities to remove things we've       # filter the next possibilities to remove things we've 
Line 2192  sub next { Line 2371  sub next {
         my $finishResource = $self->{HERE}->map_finish();          my $finishResource = $self->{HERE}->map_finish();
   
         $self->{RECURSIVE_ITERATOR} =          $self->{RECURSIVE_ITERATOR} =
           Apache::lonnavmaps::iterator->new ($self->{NAV_MAP}, $firstResource,             Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, 
                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},                       $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
                                              $self->{CONDITION});                                               $self->{CONDITION}, $self->{DIRECTION});
     }      }
   
     return $self->{HERE};      return $self->{HERE};
Removed from v.1.88  
changed lines
  Added in v.1.97

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