--- loncom/homework/lonhomework.pm	2010/03/10 21:25:36	1.318
+++ loncom/homework/lonhomework.pm	2011/07/04 13:01:57	1.327
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
 #
-# $Id: lonhomework.pm,v 1.318 2010/03/10 21:25:36 droeschl Exp $
+# $Id: lonhomework.pm,v 1.327 2011/07/04 13:01:57 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -47,6 +47,7 @@ use Apache::externalresponse();
 use Apache::rankresponse();
 use Apache::matchresponse();
 use Apache::chemresponse();
+use Apache::functionplotresponse();
 use Apache::drawimage();
 use Apache::Constants qw(:common);
 use Apache::loncommon();
@@ -111,7 +112,11 @@ sub get_target {
 	} elsif ( $env{'form.grade_target'} eq 'webgrade'
 		  && ($Apache::lonhomework::queuegrade eq 'F' )) {
 	    return ($env{'form.grade_target'});
-	}
+	} elsif ($env{'form.grade_target'} eq 'answer') {
+            if ($env{'form.answer_output_mode'} eq 'tex') {
+                return ($env{'form.grade_target'});
+            }
+        }
 	if ($env{'form.webgrade'} &&
 	    ($Apache::lonhomework::modifygrades eq 'F'
 	     || $Apache::lonhomework::queuegrade eq 'F' )) {
@@ -124,43 +129,46 @@ sub get_target {
 	    return ('web');
 	}
     } elsif ($env{'request.state'} eq "construct") {
+#
+# We are in construction space, editing and testing problems
+#
 	if ( defined($env{'form.grade_target'}) ) {
 	    return ($env{'form.grade_target'});
 	}
 	if ( defined($env{'form.preview'})) {
 	    if ( defined($env{'form.submitted'})) {
+#
+# We are doing a problem preview
+#
 		return ('grade', 'web');
 	    } else {
 		return ('web');
 	    }
 	} else {
 	    if ($env{'form.problemstate'} eq 'WEB_GRADE') {
-		#$env{'form.webgrade'} = 'yes';
 		return ('grade','webgrade','answer');
-	    } elsif (($env{'form.problemmode'} eq 'view') ||
-		     ($env{'form.problemmode'} eq 'discard')) {
-		if ( defined($env{'form.submitted'}) &&
-		     (!defined($env{'form.resetdata'})) &&
-		     (!defined($env{'form.newrandomization'}))) {
-		    return ('grade', 'web','answer');
-		} else {
-		    return ('web','answer');
-		}
-	    } elsif ($env{'form.problemmode'} eq 'edit') {
-		if ( $env{'form.submitted'} eq 'edit' ) {
-		    if ( $env{'form.submitbutton'} eq &mt('Save and View') ) {
-			return ('modified','web','answer');
-		    } else {
-			return ('modified','no_output_web','edit');
-		    }
-		} else {
-		    return ('no_output_web','edit');
-		}
+            } elsif ($env{'form.problemmode'} eq 'view') {
+                return ('grade','web','answer');
+	    } elsif ($env{'form.problemmode'} eq 'saveview') {
+                return ('modified','web','answer');
+            } elsif ($env{'form.problemmode'} eq 'discard') {
+                return ('web','answer');
+            } elsif (($env{'form.problemmode'} eq 'saveedit') ||
+                     ($env{'form.problemmode'} eq 'undo')) {
+                return ('modified','no_output_web','edit');
+            } elsif ($env{'form.problemmode'} eq 'edit') {
+		return ('no_output_web','edit');
 	    } else {
 		return ('web');
 	    }
-	}
+        }
+#
+# End of Construction Space
+#
     }
+#
+# Huh? We are nowhere, so do nothing.
+#
     return ();
 }
 
@@ -170,16 +178,6 @@ sub setup_vars {
 #  return ';$external::target='.$target.';';
 }
 
-sub createmenu {
-    my ($which,$request)=@_;
-    if ($which eq 'grade') {
-	$request->print('<script type="text/javascript" language="JavaScript"> 
-          hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
-                 "height=350,width=150,menubar=no");
-          </script>');
-    }
-}
-
 sub proctor_checked_in {
     my ($slot_name,$slot,$type)=@_;
     my @possible_proctors=split(",",$slot->{'proctor'});
@@ -265,8 +263,8 @@ sub check_slot_access {
     }
     if ($slotstatus eq 'NEEDS_CHECKIN' &&
 	&proctor_checked_in($slot_name,$returned_slot,$type)) {
-	&Apache::lonxml::debug("protoctor checked in");
-	$slotstatus='CAN_ANSWER';
+	&Apache::lonxml::debug("proctor checked in");
+	$slotstatus=$status;
     }
 
     my ($is_correct,$got_grade,$checkedin);
@@ -378,7 +376,12 @@ sub check_access {
 	    $date=&mt("can not be accessed from your location.");
 	    return($status,$date);
 	}
-	
+	if ($env{'form.grade_imsexport'}) {
+            if (($env{'request.course.id'}) && 
+                (&Apache::lonnet::allowed('mdc',$env{'request.course.id'}))) {
+                return ('SHOW_ANSWER');
+            }
+        }
 	foreach my $temp ("opendate","duedate","answerdate") {
 	    $lastdate = $date;
 	    if ($temp eq 'duedate') {
@@ -436,11 +439,14 @@ sub check_access {
 	if ( $tries eq '' ) { $tries = '0'; }
 	if ( $maxtries eq '' && 
 	     $env{'request.state'} ne 'construct') { $maxtries = '2'; } 
+	$Apache::lonhomework::results{'resource.'.$id.'.maxtries'}=$maxtries;
 	if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
 	# if (correct and show prob status) or excused then CANNOT_ANSWER
 	if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
 	    &&
-	    &show_problem_status())
+	    &show_problem_status()
+            &&
+            $Apache::lonhomework::history{"resource.$id.awarded"}==1)
 	   ||
 	   $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
 	    $status = 'CANNOT_ANSWER';
@@ -633,11 +639,12 @@ sub setupheader {
 
 sub handle_save_or_undo {
     my ($request,$problem,$result) = @_;
+
     my $file    = &Apache::lonnet::filelocation("",$request->uri);
     my $filebak =$file.".bak";
     my $filetmp =$file.".tmp";
     my $error=0;
-    if ($env{'form.Undo'} eq &mt('undo')) {
+    if (($env{'form.problemmode'} eq 'undo') || ($env{'form.problemmode'} eq 'undoxml')) {
 	my $error=0;
 	if (!&File::Copy::copy($file,$filetmp)) { $error=1; }
 	if ((!$error) && (!&File::Copy::copy($filebak,$file))) { $error=1; }
@@ -660,6 +667,7 @@ sub handle_save_or_undo {
 	}
     } else {
         &Apache::lonnet::correct_line_ends($result);
+
 	my $fs=Apache::File->new(">$filebak");
 	if (defined($fs)) {
 	    print $fs $$problem;
@@ -903,13 +911,16 @@ sub editxmlmode {
 
 	$problem='';
     }
-    if (defined($env{'form.editxmltext'}) || defined($env{'form.Undo'})) {
+
+    if (($env{'form.problemmode'} eq 'saveeditxml') ||
+        ($env{'form.problemmode'} eq 'saveviewxml') || 
+        ($env{'form.problemmode'} eq 'undoxml')) {
 	my $error=&handle_save_or_undo($request,\$problem,
 				       \$env{'form.editxmltext'});
 	if (!$error) { $problem=&Apache::lonnet::getfile($file); }
     }
     &Apache::lonhomework::showhashsubset(\%env,'^form');
-    if ( $env{'form.submitbutton'} eq &mt('Save and View') ) {
+    if ($env{'form.problemmode'} eq 'saveviewxml') {
 	&Apache::lonhomework::showhashsubset(\%env,'^form');
 	$env{'form.problemmode'}='view';
 	&renderpage($request,$file);
@@ -923,8 +934,6 @@ sub editxmlmode {
 	    &Apache::loncommon::resize_textarea_js().
             &Apache::structuretags::setmode_javascript().
             &Apache::lonhtmlcommon::dragmath_js("EditMathPopup");
-	my $dragmath_button = 
-            &Apache::lonhtmlcommon::dragmath_button("LC_editxmltext",1);
 
     # Breadcrumbs
     my $brcrum = [{'href' => &Apache::loncommon::authorspace(),
@@ -939,9 +948,9 @@ sub editxmlmode {
 					    'add_entries'      => {
 						'onresize' => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
 						'onload'   => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
-                                    },
+                                                                  },
                                                 'bread_crumbs' => $brcrum,
-});
+                                             });
 
     $result=$start_page
            .&Apache::loncommon::head_subbox(
@@ -956,25 +965,13 @@ sub editxmlmode {
                 </td><td align="right">
                   '.&Apache::loncommon::helpLatexCheatsheet('Problem_LON-CAPA_Functions','Script Functions').'
                 </td></tr>
-              </table>
-              <div class="LC_edit_problem_discards">
-                <input type="hidden" name="problemmode" value="editxml" />
-
-                <input type="button" name="submitmode" accesskey="d" value="'.&mt('Discard Edits and View').'" '.
-                'onclick="javascript:setmode(this.form,'."'discard'".')" />
-                <input type="button" '.&Apache::edit::submit_ask_anyway('setmode(this.form,'."'edit'".')').'name="submitmode" accesskey="e" value="'.&mt('Edit').'" />
-                <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
-                '.$dragmath_button.'
-              </div>
-              <div class="LC_edit_problem_saves">
-                <input type="submit" name="submitbutton" accesskey="s" value="'.&mt('Save').'"  />
-                <input type="submit" name="submitbutton" accesskey="v" value="'.&mt('Save and View').'" />
-              </div>
-              <hr style="clear:both;" />
-	      '.&Apache::lonxml::message_location().'
-            </div>
-            '  . '
-            <textarea '.&Apache::edit::element_change_detection().
+              </table>';
+
+         $result.='<input type="hidden" name="problemmode" value="saveedit" />'.
+                  &Apache::structuretags::problem_edit_buttons('editxml');
+         
+         $result.='<hr style="clear:both;" />'.&Apache::lonxml::message_location().'</div>'.  
+                  '<textarea '.&Apache::edit::element_change_detection().
 	              ' rows="'.$rows.'" cols="'.$cols.'" style="width:100%" '.
 		      ' name="editxmltext" id="LC_editxmltext">'.
 		      &HTML::Entities::encode($problem,'<>&"').'</textarea>
@@ -1251,7 +1248,10 @@ sub handler {
 		#first visit to problem in construction space
 		$env{'form.problemmode'}= 'view';
 		&renderpage($request,$file);
-	    } elsif ($env{'form.problemmode'} eq 'editxml') {
+	    } elsif (($env{'form.problemmode'} eq 'editxml') || 
+                     ($env{'form.problemmode'} eq 'saveeditxml') ||
+                     ($env{'form.problemmode'} eq 'saveviewxml') ||
+                     ($env{'form.problemmode'} eq 'undoxml')) {
 		&editxmlmode($request,$file);
 	    } elsif ($env{'form.problemmode'} eq 'calcanswers') {
 		&analyze($request,$file);