Added 'studentview' button functionality.

lib/moodlelib.php

@@ -2017,6 +2017,10 @@ function isadmin($userid=0) {
     global $USER;
     static $admins, $nonadmins;
 
+//    if (!empty($USER->studentview)) {
+//        return false;
+//    }
+
     if (!isset($admins)) {
         $admins = array();
         $nonadmins = array();
@@ -2066,7 +2070,13 @@ function isteacher($courseid=0, $userid=0, $includeadmin=true) {
         }
         if (!empty($USER->teacher) and $courseid) {   // look in session cache
             if (!empty($USER->teacher[$courseid])) {  // Explicitly a teacher, good
-                return true;
+                // normally return 'true', but override if 'studentview' on
+                if (!empty($USER->studentview)) {
+                    return false;
+                }
+                else {
+                    return true;
+                }
             }
         }
         $userid = $USER->id;                        // we need to make further checks
@@ -2123,11 +2133,17 @@ function isteacherinanycourse($userid=0, $includeadmin=true) {
  * @uses $USER
  * @param int $courseid The id of the course that is being edited
  * @param int $userid The id of the user that is being tested against. Set this to 0 if you would just like to test against the currently logged in user.
+ * @param bool $ignorestudentview true = don't do check for studentview mode
  * @return boo
  */
-function isteacheredit($courseid, $userid=0) {
+function isteacheredit($courseid, $userid=0, $ignorestudentview=false) {
     global $USER;
 
+    // we can't edit in studentview
+    if (!empty($USER->studentview) and !$ignorestudentview) {
+        return false;
+    }
+
     if (isadmin($userid)) {  // admins can do anything
         return true;
     }

lib/pagelib.php

@@ -388,10 +388,11 @@ class page_course extends page_base {
 
         // The "Editing On" button will be appearing only in the "main" course screen
         // (i.e., no breadcrumbs other than the default one added inside this function)
-        $button = empty($morebreadcrumbs) ? update_course_icon($this->courserecord->id) : ' ';
+        $buttons = update_course_icon($this->courserecord->id ) . update_studentview_button( $this->courserecord->id );
+        $buttons = empty($morebreadcrumbs) ? $buttons : ' ';
 
         print_header($title, $this->courserecord->fullname, $crumbtext,
-                     '', '', true, $button, user_login_string($this->courserecord, $USER));
+                     '', '', true, $buttons, user_login_string($this->courserecord, $USER));
     }
 
     // SELF-REPORTING SECTION

lib/weblib.php

@@ -3064,9 +3064,39 @@ function update_course_icon($courseid) {
             $edit = 'on';
         }
         return "<form target=\"$CFG->framename\" method=\"get\" action=\"$CFG->wwwroot/course/view.php\">".
-               "<input type=\"hidden\" name=\"id\" value=\"$courseid\" />".
-               "<input type=\"hidden\" name=\"edit\" value=\"$edit\" />".
-               "<input type=\"submit\" value=\"$string\" /></form>";
+            "<input type=\"hidden\" name=\"id\" value=\"$courseid\" />".
+            "<input type=\"hidden\" name=\"edit\" value=\"$edit\" />".
+            "<input type=\"hidden\" name=\"sesskey\" value=\"".sesskey()."\" />".
+            "<input type=\"submit\" value=\"$string\" /></form>";
+    }
+}
+
+/**
+ * Returns a turn student view on/off button for course in a self contained form.
+ *
+ * @uses $CFG
+ * @uses $USER
+ * @param int $courseid The course  to update by id as found in 'course' table
+ * @return string
+ */
+function update_studentview_button($courseid) {
+
+    global $CFG, $USER;
+
+    if (isteacheredit($courseid,0,true)) {
+        if (!empty($USER->studentview)) {
+            $svstring = get_string('studentviewoff');
+            $svedit = 'off';
+        } else {
+            $svstring = get_string('studentviewon');
+            $svedit = 'on';
+        }
+        $button = "<form target=\"$CFG->framename\" method=\"get\" action=\"$CFG->wwwroot/course/view.php\">".
+            "<input type=\"hidden\" name=\"id\" value=\"$courseid\" />".
+            "<input type=\"hidden\" name=\"studentview\" value=\"$svedit\" />".
+            "<input type=\"hidden\" name=\"sesskey\" value=\"".sesskey()."\" />".
+            "<input type=\"submit\" value=\"$svstring\" /></form>";
+        return $button;
     }
 }
 
@@ -3080,6 +3110,11 @@ function update_course_icon($courseid) {
 function update_module_button($moduleid, $courseid, $string) {
     global $CFG, $USER;
 
+    // do not display if studentview is on
+    if (!empty($USER->studentview)) {
+        return '';
+    }
+
     if (isteacheredit($courseid)) {
         $string = get_string('updatethis', '', $string);
         return "<form target=\"$CFG->framename\" method=\"get\" action=\"$CFG->wwwroot/course/mod.php\">".