/**
  * Loads category specific settings in the navigation
  *
  * @return navigation_node
  */
 protected function load_category_settings()
 {
     global $CFG;
     $categorynode = $this->add(print_context_name($this->context), null, null, null, 'categorysettings');
     $categorynode->force_open();
     if (has_any_capability(array('moodle/category:manage', 'moodle/course:create'), $this->context)) {
         $url = new moodle_url('/course/category.php', array('id' => $this->context->instanceid, 'sesskey' => sesskey()));
         if ($this->page->user_is_editing()) {
             $url->param('categoryedit', '0');
             $editstring = get_string('turneditingoff');
         } else {
             $url->param('categoryedit', '1');
             $editstring = get_string('turneditingon');
         }
         $categorynode->add($editstring, $url, self::TYPE_SETTING, null, null, new pix_icon('i/edit', ''));
     }
     if ($this->page->user_is_editing() && has_capability('moodle/category:manage', $this->context)) {
         $editurl = new moodle_url('/course/editcategory.php', array('id' => $this->context->instanceid));
         $categorynode->add(get_string('editcategorythis'), $editurl, self::TYPE_SETTING, null, 'edit', new pix_icon('i/edit', ''));
         $addsubcaturl = new moodle_url('/course/editcategory.php', array('parent' => $this->context->instanceid));
         $categorynode->add(get_string('addsubcategory'), $addsubcaturl, self::TYPE_SETTING, null, 'addsubcat', new pix_icon('i/withsubcat', ''));
     }
     // Assign local roles
     if (has_capability('moodle/role:assign', $this->context)) {
         $assignurl = new moodle_url('/' . $CFG->admin . '/roles/assign.php', array('contextid' => $this->context->id));
         $categorynode->add(get_string('assignroles', 'role'), $assignurl, self::TYPE_SETTING, null, 'roles', new pix_icon('i/roles', ''));
     }
     // Override roles
     if (has_capability('moodle/role:review', $this->context) or count(get_overridable_roles($this->context)) > 0) {
         $url = new moodle_url('/' . $CFG->admin . '/roles/permissions.php', array('contextid' => $this->context->id));
         $categorynode->add(get_string('permissions', 'role'), $url, self::TYPE_SETTING, null, 'permissions', new pix_icon('i/permissions', ''));
     }
     // Check role permissions
     if (has_any_capability(array('moodle/role:assign', 'moodle/role:safeoverride', 'moodle/role:override', 'moodle/role:assign'), $this->context)) {
         $url = new moodle_url('/' . $CFG->admin . '/roles/check.php', array('contextid' => $this->context->id));
         $categorynode->add(get_string('checkpermissions', 'role'), $url, self::TYPE_SETTING, null, 'checkpermissions', new pix_icon('i/checkpermissions', ''));
     }
     // Cohorts
     if (has_capability('moodle/cohort:manage', $this->context) or has_capability('moodle/cohort:view', $this->context)) {
         $categorynode->add(get_string('cohorts', 'cohort'), new moodle_url('/cohort/index.php', array('contextid' => $this->context->id)), self::TYPE_SETTING, null, 'cohort', new pix_icon('i/cohort', ''));
     }
     // Manage filters
     if (has_capability('moodle/filter:manage', $this->context) && count(filter_get_available_in_context($this->context)) > 0) {
         $url = new moodle_url('/filter/manage.php', array('contextid' => $this->context->id));
         $categorynode->add(get_string('filters', 'admin'), $url, self::TYPE_SETTING, null, 'filters', new pix_icon('i/filter', ''));
     }
     return $categorynode;
 }

 /**
  * Loads category specific settings in the navigation
  *
  * @return navigation_node
  */
 protected function load_category_settings()
 {
     global $CFG;
     // We can land here while being in the context of a block, in which case we
     // should get the parent context which should be the category one. See self::initialise().
     if ($this->context->contextlevel == CONTEXT_BLOCK) {
         $catcontext = $this->context->get_parent_context();
     } else {
         $catcontext = $this->context;
     }
     // Let's make sure that we always have the right context when getting here.
     if ($catcontext->contextlevel != CONTEXT_COURSECAT) {
         throw new coding_exception('Unexpected context while loading category settings.');
     }
     $categorynode = $this->add($catcontext->get_context_name(), null, null, null, 'categorysettings');
     $categorynode->nodetype = navigation_node::NODETYPE_BRANCH;
     $categorynode->force_open();
     if (can_edit_in_category($catcontext->instanceid)) {
         $url = new moodle_url('/course/management.php', array('categoryid' => $catcontext->instanceid));
         $editstring = get_string('managecategorythis');
         $categorynode->add($editstring, $url, self::TYPE_SETTING, null, null, new pix_icon('i/edit', ''));
     }
     if (has_capability('moodle/category:manage', $catcontext)) {
         $editurl = new moodle_url('/course/editcategory.php', array('id' => $catcontext->instanceid));
         $categorynode->add(get_string('editcategorythis'), $editurl, self::TYPE_SETTING, null, 'edit', new pix_icon('i/edit', ''));
         $addsubcaturl = new moodle_url('/course/editcategory.php', array('parent' => $catcontext->instanceid));
         $categorynode->add(get_string('addsubcategory'), $addsubcaturl, self::TYPE_SETTING, null, 'addsubcat', new pix_icon('i/withsubcat', ''));
     }
     // Assign local roles
     $assignableroles = get_assignable_roles($catcontext);
     if (!empty($assignableroles)) {
         $assignurl = new moodle_url('/' . $CFG->admin . '/roles/assign.php', array('contextid' => $catcontext->id));
         $categorynode->add(get_string('assignroles', 'role'), $assignurl, self::TYPE_SETTING, null, 'roles', new pix_icon('i/assignroles', ''));
     }
     // Override roles
     if (has_capability('moodle/role:review', $catcontext) or count(get_overridable_roles($catcontext)) > 0) {
         $url = new moodle_url('/' . $CFG->admin . '/roles/permissions.php', array('contextid' => $catcontext->id));
         $categorynode->add(get_string('permissions', 'role'), $url, self::TYPE_SETTING, null, 'permissions', new pix_icon('i/permissions', ''));
     }
     // Check role permissions
     if (has_any_capability(array('moodle/role:assign', 'moodle/role:safeoverride', 'moodle/role:override', 'moodle/role:assign'), $catcontext)) {
         $url = new moodle_url('/' . $CFG->admin . '/roles/check.php', array('contextid' => $catcontext->id));
         $categorynode->add(get_string('checkpermissions', 'role'), $url, self::TYPE_SETTING, null, 'checkpermissions', new pix_icon('i/checkpermissions', ''));
     }
     // Cohorts
     if (has_any_capability(array('moodle/cohort:view', 'moodle/cohort:manage'), $catcontext)) {
         $categorynode->add(get_string('cohorts', 'cohort'), new moodle_url('/cohort/index.php', array('contextid' => $catcontext->id)), self::TYPE_SETTING, null, 'cohort', new pix_icon('i/cohort', ''));
     }
     // Manage filters
     if (has_capability('moodle/filter:manage', $catcontext) && count(filter_get_available_in_context($catcontext)) > 0) {
         $url = new moodle_url('/filter/manage.php', array('contextid' => $catcontext->id));
         $categorynode->add(get_string('filters', 'admin'), $url, self::TYPE_SETTING, null, 'filters', new pix_icon('i/filter', ''));
     }
     // Restore.
     if (has_capability('moodle/restore:restorecourse', $catcontext)) {
         $url = new moodle_url('/backup/restorefile.php', array('contextid' => $catcontext->id));
         $categorynode->add(get_string('restorecourse', 'admin'), $url, self::TYPE_SETTING, null, 'restorecourse', new pix_icon('i/restore', ''));
     }
     // Let plugins hook into category settings navigation.
     $pluginsfunction = get_plugins_with_function('extend_navigation_category_settings', 'lib.php');
     foreach ($pluginsfunction as $plugintype => $plugins) {
         foreach ($plugins as $pluginfunction) {
             $pluginfunction($categorynode, $catcontext);
         }
     }
     return $categorynode;
 }

    }
} else {
    if (!empty($courseid)) {
        // we need this for user tabs in user context
        if (!($course = get_record('course', 'id', $courseid))) {
            error('Invalid course id');
        }
    } else {
        $courseid = SITEID;
        $course = clone $SITE;
    }
}
require_login($course);
require_capability('moodle/role:assign', $context);
/// needed for tabs.php
$overridableroles = get_overridable_roles($context, 'name', ROLENAME_BOTH);
$assignableroles = get_assignable_roles($context, 'name', ROLENAME_BOTH);
/// Get some language strings
$strpotentialusers = get_string('potentialusers', 'role');
$strexistingusers = get_string('existingusers', 'role');
$straction = get_string('assignroles', 'role');
$strroletoassign = get_string('roletoassign', 'role');
$strsearch = get_string('search');
$strshowall = get_string('showall');
$strparticipants = get_string('participants');
$strsearchresults = get_string('searchresults');
$unlimitedperiod = get_string('unlimited');
$defaultperiod = $course->enrolperiod;
for ($i = 1; $i <= 365; $i++) {
    $seconds = $i * 86400;
    $periodmenu[$seconds] = get_string('numdays', '', $i);

    $courseid = SITEID;
    $coursecontext = $context;
}
require_login($course);
$baseurl = 'override.php?contextid=' . $context->id;
if (!empty($userid)) {
    $baseurl .= '&userid=' . $userid;
}
if ($courseid != SITEID) {
    $baseurl .= '&courseid=' . $courseid;
}
if ($cancel) {
    redirect($baseurl);
}
/// needed for tabs.php
$overridableroles = get_overridable_roles($context);
$assignableroles = get_assignable_roles($context);
/// Get some language strings
$strroletooverride = get_string('roletooverride', 'role');
$straction = get_string('overrideroles', 'role');
$strcurrentrole = get_string('currentrole', 'role');
$strparticipants = get_string('participants');
/// Make sure this user can override that role
if ($roleid) {
    if (!user_can_override($context, $roleid)) {
        error('you can not override this role in this context');
    }
}
if ($userid) {
    $user = get_record('user', 'id', $userid);
    $fullname = fullname($user, has_capability('moodle/site:viewfullnames', $context));

if ($safeoverridesonly) {
    require_capability('moodle/role:safeoverride', $context);
}
/// Handle the cancel button.
if (optional_param('cancel', false, PARAM_BOOL)) {
    redirect($baseurl);
}
/// Handle the toggle advanced mode button.
$showadvanced = get_user_preferences('overridepermissions_showadvanced', false);
if (optional_param('toggleadvanced', false, PARAM_BOOL)) {
    $showadvanced = !$showadvanced;
    set_user_preference('overridepermissions_showadvanced', $showadvanced);
}
/// These are needed early because of tabs.php
$assignableroles = get_assignable_roles($context, ROLENAME_BOTH);
list($overridableroles, $overridecounts, $nameswithcounts) = get_overridable_roles($context, ROLENAME_BOTH, true);
/// Make sure this user can override that role
if ($roleid && !isset($overridableroles[$roleid])) {
    $a = new stdClass();
    $a->roleid = $roleid;
    $a->context = $contextname;
    print_error('cannotoverriderolehere', '', get_context_url($context), $a);
}
/// If we are actually overriding a role, create the table object, and save changes if appropriate.
if ($roleid) {
    if ($showadvanced) {
        $overridestable = new override_permissions_table_advanced($context, $roleid, $safeoverridesonly);
    } else {
        $overridestable = new override_permissions_table_basic($context, $roleid, $safeoverridesonly);
    }
    $overridestable->read_submitted_permissions();

    $contexts[$conid]->roleassignments = array();
}
/// Put the contexts into a tree structure.
foreach ($contexts as $conid => $con) {
    $context = context::instance_by_id($conid);
    $parentcontextid = get_parent_contextid($context);
    if ($parentcontextid) {
        $contexts[$parentcontextid]->children[] = $conid;
    }
}
/// Put the role capabilities into the context tree.
foreach ($roleassignments as $ra) {
    $contexts[$ra->contextid]->roleassignments[$ra->roleid] = $ra;
}
$assignableroles = get_assignable_roles($usercontext, ROLENAME_BOTH);
$overridableroles = get_overridable_roles($usercontext, ROLENAME_BOTH);
/// Print the header
$fullname = fullname($user, has_capability('moodle/site:viewfullnames', $coursecontext));
$straction = get_string('thisusersroles', 'role');
$title = get_string('xroleassignments', 'role', $fullname);
/// Course header
$PAGE->set_title($title);
if ($courseid != SITEID) {
    $PAGE->set_heading($fullname);
} else {
    $PAGE->set_heading($course->fullname);
}
echo $OUTPUT->header();
echo $OUTPUT->heading($title, 3);
echo $OUTPUT->box_start('generalbox boxaligncenter boxwidthnormal');
// Display them.

 /**
  * Test getting of all overridable roles.
  */
 public function test_get_overridable_roles()
 {
     global $DB;
     $this->resetAfterTest();
     $course = $this->getDataGenerator()->create_course();
     $coursecontext = context_course::instance($course->id);
     $teacherrole = $DB->get_record('role', array('shortname' => 'editingteacher'), '*', MUST_EXIST);
     $teacher = $this->getDataGenerator()->create_user();
     role_assign($teacherrole->id, $teacher->id, $coursecontext);
     $teacherename = (object) array('roleid' => $teacherrole->id, 'name' => 'Učitel', 'contextid' => $coursecontext->id);
     $DB->insert_record('role_names', $teacherename);
     $this->assertTrue($DB->record_exists('capabilities', array('name' => 'moodle/backup:backupcourse')));
     // Any capability is ok.
     assign_capability('moodle/backup:backupcourse', CAP_PROHIBIT, $teacherrole->id, $coursecontext->id);
     $studentrole = $DB->get_record('role', array('shortname' => 'student'), '*', MUST_EXIST);
     $student = $this->getDataGenerator()->create_user();
     role_assign($studentrole->id, $student->id, $coursecontext);
     $contexts = $DB->get_records('context');
     $users = $DB->get_records('user');
     $allroles = $DB->get_records('role');
     // Evaluate all results for all users in all contexts.
     foreach ($users as $user) {
         $this->setUser($user);
         foreach ($contexts as $contextid => $unused) {
             $context = context_helper::instance_by_id($contextid);
             $roles = get_overridable_roles($context, ROLENAME_SHORT);
             foreach ($allroles as $roleid => $role) {
                 $hascap = has_any_capability(array('moodle/role:safeoverride', 'moodle/role:override'), $context);
                 if (is_siteadmin()) {
                     $this->assertTrue(isset($roles[$roleid]));
                 } else {
                     $parents = $context->get_parent_context_ids(true);
                     $pcontexts = implode(',', $parents);
                     $allowed = $DB->record_exists_sql("SELECT r.id\n                               FROM {role} r\n                               JOIN {role_allow_override} rao ON r.id = rao.allowoverride\n                               JOIN {role_assignments} ra ON rao.roleid = ra.roleid\n                              WHERE ra.userid = :userid AND ra.contextid IN ({$pcontexts}) AND r.id = :roleid\n                            ", array('userid' => $user->id, 'roleid' => $roleid));
                     if (isset($roles[$roleid])) {
                         $this->assertTrue($hascap);
                         $this->assertTrue($allowed);
                     } else {
                         $this->assertFalse($hascap and $allowed);
                     }
                 }
                 if (isset($roles[$roleid])) {
                     $this->assertEquals($role->shortname, $roles[$roleid]);
                 }
             }
         }
     }
     // Test parameter defaults.
     $this->setAdminUser();
     $roles1 = get_overridable_roles($coursecontext);
     $roles2 = get_overridable_roles($coursecontext, ROLENAME_ALIAS, false);
     $this->assertEquals($roles2, $roles1);
     $alltypes = array(ROLENAME_ALIAS, ROLENAME_ALIAS_RAW, ROLENAME_BOTH, ROLENAME_ORIGINAL, ROLENAME_ORIGINALANDSHORT, ROLENAME_SHORT);
     foreach ($alltypes as $type) {
         $rolenames = role_fix_names($allroles, $coursecontext, $type);
         $roles = get_overridable_roles($coursecontext, $type, false);
         foreach ($roles as $roleid => $rolename) {
             $this->assertSame($rolenames[$roleid]->localname, $rolename);
         }
     }
     // Verify counts.
     $roles = get_overridable_roles($coursecontext, ROLENAME_ALIAS, false);
     list($rolenames, $rolecounts, $nameswithcounts) = get_overridable_roles($coursecontext, ROLENAME_ALIAS, true);
     $this->assertEquals($roles, $rolenames);
     foreach ($rolenames as $roleid => $name) {
         if ($roleid == $teacherrole->id) {
             $this->assertEquals(1, $rolecounts[$roleid]);
         } else {
             $this->assertEquals(0, $rolecounts[$roleid]);
         }
         $this->assertSame("{$name} ({$rolecounts[$roleid]})", $nameswithcounts[$roleid]);
     }
 }

 /**
  * Get the appropriate list of editing icons for a block. This is used
  * to set {@link block_contents::$controls} in {@link block_base::get_contents_for_output()}.
  *
  * @param $output The core_renderer to use when generating the output. (Need to get icon paths.)
  * @return an array in the format for {@link block_contents::$controls}
  */
 public function edit_controls($block)
 {
     global $CFG;
     $controls = array();
     $actionurl = $this->page->url->out(false, array('sesskey' => sesskey()));
     $blocktitle = $block->title;
     if (empty($blocktitle)) {
         $blocktitle = $block->arialabel;
     }
     if ($this->page->user_can_edit_blocks()) {
         // Move icon.
         $str = new lang_string('moveblock', 'block', $blocktitle);
         $controls[] = new action_menu_link_primary(new moodle_url($actionurl, array('bui_moveid' => $block->instance->id)), new pix_icon('t/move', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_move'));
     }
     if ($this->page->user_can_edit_blocks() || $block->user_can_edit()) {
         // Edit config icon - always show - needed for positioning UI.
         $str = new lang_string('configureblock', 'block', $blocktitle);
         $controls[] = new action_menu_link_secondary(new moodle_url($actionurl, array('bui_editid' => $block->instance->id)), new pix_icon('t/edit', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_edit'));
     }
     if ($this->page->user_can_edit_blocks() && $block->instance_can_be_hidden()) {
         // Show/hide icon.
         if ($block->instance->visible) {
             $str = new lang_string('hideblock', 'block', $blocktitle);
             $url = new moodle_url($actionurl, array('bui_hideid' => $block->instance->id));
             $icon = new pix_icon('t/hide', $str, 'moodle', array('class' => 'iconsmall', 'title' => ''));
             $attributes = array('class' => 'editing_hide');
         } else {
             $str = new lang_string('showblock', 'block', $blocktitle);
             $url = new moodle_url($actionurl, array('bui_showid' => $block->instance->id));
             $icon = new pix_icon('t/show', $str, 'moodle', array('class' => 'iconsmall', 'title' => ''));
             $attributes = array('class' => 'editing_show');
         }
         $controls[] = new action_menu_link_secondary($url, $icon, $str, $attributes);
     }
     // Display either "Assign roles" or "Permissions" or "Change permissions" icon (whichever first is available).
     $rolesurl = null;
     if (get_assignable_roles($block->context, ROLENAME_SHORT)) {
         $rolesurl = new moodle_url('/admin/roles/assign.php', array('contextid' => $block->context->id));
         $str = new lang_string('assignrolesinblock', 'block', $blocktitle);
         $icon = 'i/assignroles';
     } else {
         if (has_capability('moodle/role:review', $block->context) or get_overridable_roles($block->context)) {
             $rolesurl = new moodle_url('/admin/roles/permissions.php', array('contextid' => $block->context->id));
             $str = get_string('permissions', 'role');
             $icon = 'i/permissions';
         } else {
             if (has_any_capability(array('moodle/role:safeoverride', 'moodle/role:override', 'moodle/role:assign'), $block->context)) {
                 $rolesurl = new moodle_url('/admin/roles/check.php', array('contextid' => $block->context->id));
                 $str = get_string('checkpermissions', 'role');
                 $icon = 'i/checkpermissions';
             }
         }
     }
     if ($rolesurl) {
         // TODO: please note it is sloppy to pass urls through page parameters!!
         //      it is shortened because some web servers (e.g. IIS by default) give
         //      a 'security' error if you try to pass a full URL as a GET parameter in another URL.
         $return = $this->page->url->out(false);
         $return = str_replace($CFG->wwwroot . '/', '', $return);
         $rolesurl->param('returnurl', $return);
         $controls[] = new action_menu_link_secondary($rolesurl, new pix_icon($icon, $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_roles'));
     }
     if ($this->user_can_delete_block($block)) {
         // Delete icon.
         $str = new lang_string('deleteblock', 'block', $blocktitle);
         $controls[] = new action_menu_link_secondary(new moodle_url($actionurl, array('bui_deleteid' => $block->instance->id)), new pix_icon('t/delete', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_delete'));
     }
     return $controls;
 }

 function get_content()
 {
     global $CFG, $USER, $SITE, $COURSE;
     if ($this->content !== NULL) {
         return $this->content;
     }
     $this->content = new stdClass();
     $this->content->items = array();
     $this->content->icons = array();
     $this->content->footer = '';
     if (empty($this->instance->pageid)) {
         // sticky
         if (!empty($COURSE)) {
             $this->instance->pageid = $COURSE->id;
         }
     }
     if (empty($this->instance)) {
         return $this->content = '';
     } else {
         if ($this->instance->pageid == SITEID) {
             // return $this->content = '';
         }
     }
     if (!empty($this->instance->pageid)) {
         $context = get_context_instance(CONTEXT_COURSE, $this->instance->pageid);
         if ($COURSE->id == $this->instance->pageid) {
             $course = $COURSE;
         } else {
             $course = get_record('course', 'id', $this->instance->pageid);
         }
     } else {
         $context = get_context_instance(CONTEXT_SYSTEM);
         $course = $SITE;
     }
     if (!has_capability('moodle/course:view', $context)) {
         // Just return
         return $this->content;
     }
     if (empty($CFG->loginhttps)) {
         $securewwwroot = $CFG->wwwroot;
     } else {
         $securewwwroot = str_replace('http:', 'https:', $CFG->wwwroot);
     }
     /// Course editing on/off
     if ($course->id !== SITEID and has_capability('moodle/course:update', $context)) {
         $this->content->icons[] = '<img src="' . $CFG->pixpath . '/i/edit.gif" class="icon" alt="" />';
         if (isediting($this->instance->pageid)) {
             $this->content->items[] = '<a href="view.php?id=' . $this->instance->pageid . '&amp;edit=off&amp;sesskey=' . sesskey() . '">' . get_string('turneditingoff') . '</a>';
         } else {
             $this->content->items[] = '<a href="view.php?id=' . $this->instance->pageid . '&amp;edit=on&amp;sesskey=' . sesskey() . '">' . get_string('turneditingon') . '</a>';
         }
         $this->content->items[] = '<a href="' . $CFG->wwwroot . '/course/edit.php?id=' . $this->instance->pageid . '">' . get_string('settings') . '</a>';
         $this->content->icons[] = '<img src="' . $CFG->pixpath . '/i/settings.gif" class="icon" alt="" />';
     }
     /// Assign roles to the course
     if ($course->id != SITEID) {
         if (has_capability('moodle/role:assign', $context)) {
             $this->content->items[] = '<a href="' . $CFG->wwwroot . '/' . $CFG->admin . '/roles/assign.php?contextid=' . $context->id . '">' . get_string('assignroles', 'role') . '</a>';
             $this->content->icons[] = '<img src="' . $CFG->pixpath . '/i/roles.gif" class="icon" alt="" />';
         } else {
             if (get_overridable_roles($context, 'name', ROLENAME_ORIGINAL)) {
                 $this->content->items[] = '<a href="' . $CFG->wwwroot . '/' . $CFG->admin . '/roles/override.php?contextid=' . $context->id . '">' . get_string('overridepermissions', 'role') . '</a>';
                 $this->content->icons[] = '<img src="' . $CFG->pixpath . '/i/roles.gif" class="icon" alt="" />';
             }
         }
     }
     /// View course grades (or just your own grades, same link)
     /// find all accessible reports
     if ($course->id !== SITEID) {
         $reportavailable = false;
         if (has_capability('moodle/grade:viewall', $context)) {
             $reportavailable = true;
         } else {
             if (!empty($course->showgrades)) {
                 if ($reports = get_list_of_plugins('grade/report')) {
                     // Get all installed reports
                     arsort($reports);
                     // user is last, we want to test it first
                     foreach ($reports as $plugin) {
                         if (has_capability('gradereport/' . $plugin . ':view', $context)) {
                             //stop when the first visible plugin is found
                             $reportavailable = true;
                             break;
                         }
                     }
                 }
             }
         }
         if ($reportavailable) {
             $this->content->items[] = '<a href="' . $CFG->wwwroot . '/grade/report/index.php?id=' . $this->instance->pageid . '">' . get_string('grades') . '</a>';
             $this->content->icons[] = '<img src="' . $CFG->pixpath . '/i/grades.gif" class="icon" alt="" />';
         }
     }
     /// Course outcomes (to help give it more prominence because it's important)
     if (!empty($CFG->enableoutcomes)) {
         if ($course->id !== SITEID and has_capability('moodle/course:update', $context)) {
             $this->content->items[] = '<a href="' . $CFG->wwwroot . '/grade/edit/outcome/course.php?id=' . $this->instance->pageid . '">' . get_string('outcomes', 'grades') . '</a>';
             $this->content->icons[] = '<img src="' . $CFG->pixpath . '/i/outcomes.gif" class="icon" alt="" />';
         }
     }
//.........这里部分代码省略.........

 /**
  * Get the appropriate list of editing icons for a block. This is used
  * to set {@link block_contents::$controls} in {@link block_base::get_contents_for_output()}.
  *
  * @param $output The core_renderer to use when generating the output. (Need to get icon paths.)
  * @return an array in the format for {@link block_contents::$controls}
  */
 public function edit_controls($block)
 {
     global $CFG;
     $controls = array();
     $actionurl = $this->page->url->out(false, array('sesskey' => sesskey()));
     $blocktitle = $block->title;
     if (empty($blocktitle)) {
         $blocktitle = $block->arialabel;
     }
     if ($this->page->user_can_edit_blocks()) {
         // Move icon.
         $str = new lang_string('moveblock', 'block', $blocktitle);
         $controls[] = new action_menu_link_primary(new moodle_url($actionurl, array('bui_moveid' => $block->instance->id)), new pix_icon('t/move', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_move'));
     }
     if ($this->page->user_can_edit_blocks() || $block->user_can_edit()) {
         // Edit config icon - always show - needed for positioning UI.
         $str = new lang_string('configureblock', 'block', $blocktitle);
         $controls[] = new action_menu_link_secondary(new moodle_url($actionurl, array('bui_editid' => $block->instance->id)), new pix_icon('t/edit', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_edit'));
     }
     if ($this->page->user_can_edit_blocks() && $block->instance_can_be_hidden()) {
         // Show/hide icon.
         if ($block->instance->visible) {
             $str = new lang_string('hideblock', 'block', $blocktitle);
             $url = new moodle_url($actionurl, array('bui_hideid' => $block->instance->id));
             $icon = new pix_icon('t/hide', $str, 'moodle', array('class' => 'iconsmall', 'title' => ''));
             $attributes = array('class' => 'editing_hide');
         } else {
             $str = new lang_string('showblock', 'block', $blocktitle);
             $url = new moodle_url($actionurl, array('bui_showid' => $block->instance->id));
             $icon = new pix_icon('t/show', $str, 'moodle', array('class' => 'iconsmall', 'title' => ''));
             $attributes = array('class' => 'editing_show');
         }
         $controls[] = new action_menu_link_secondary($url, $icon, $str, $attributes);
     }
     // Assign roles.
     if (get_assignable_roles($block->context, ROLENAME_SHORT)) {
         $rolesurl = new moodle_url('/admin/roles/assign.php', array('contextid' => $block->context->id, 'returnurl' => $this->page->url->out_as_local_url()));
         $str = new lang_string('assignrolesinblock', 'block', $blocktitle);
         $controls[] = new action_menu_link_secondary($rolesurl, new pix_icon('i/assignroles', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_assignroles'));
     }
     // Permissions.
     if (has_capability('moodle/role:review', $block->context) or get_overridable_roles($block->context)) {
         $rolesurl = new moodle_url('/admin/roles/permissions.php', array('contextid' => $block->context->id, 'returnurl' => $this->page->url->out_as_local_url()));
         $str = get_string('permissions', 'role');
         $controls[] = new action_menu_link_secondary($rolesurl, new pix_icon('i/permissions', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_permissions'));
     }
     // Change permissions.
     if (has_any_capability(array('moodle/role:safeoverride', 'moodle/role:override', 'moodle/role:assign'), $block->context)) {
         $rolesurl = new moodle_url('/admin/roles/check.php', array('contextid' => $block->context->id, 'returnurl' => $this->page->url->out_as_local_url()));
         $str = get_string('checkpermissions', 'role');
         $controls[] = new action_menu_link_secondary($rolesurl, new pix_icon('i/checkpermissions', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_checkroles'));
     }
     if ($this->user_can_delete_block($block)) {
         // Delete icon.
         $str = new lang_string('deleteblock', 'block', $blocktitle);
         $controls[] = new action_menu_link_secondary(new moodle_url($actionurl, array('bui_deleteid' => $block->instance->id)), new pix_icon('t/delete', $str, 'moodle', array('class' => 'iconsmall', 'title' => '')), $str, array('class' => 'editing_delete'));
     }
     return $controls;
 }