From 8b2f9b0386b504142ea5d2a155e0f89cf8bb90e0 Mon Sep 17 00:00:00 2001
From: Mihail Geshoski <mihail@moodle.com>
Date: Sat, 8 Oct 2022 00:12:42 +0800
Subject: [PATCH] MDL-75513 core_grades: Create trigger element for the group
 selector

Creates a renderer method and a template for the element that would
trigger the group selector.
---
 grade/renderer.php                      | 45 +++++++++++++++++++++++
 grade/templates/group_selector.mustache | 49 +++++++++++++++++++++++++
 lang/en/moodle.php                      |  2 +
 3 files changed, 96 insertions(+)
 create mode 100644 grade/templates/group_selector.mustache

diff --git a/grade/renderer.php b/grade/renderer.php
index ceb5ab92fc4..8a595a875ca 100644
--- a/grade/renderer.php
+++ b/grade/renderer.php
@@ -37,4 +37,49 @@ class core_grades_renderer extends plugin_renderer_base {
         $data = $actionbar->export_for_template($this);
         return $this->render_from_template($actionbar->get_template(), $data);
     }
+
+    /**
+     * Renders the group selector trigger element.
+     *
+     * @param object $course The course object.
+     * @param string|null $groupactionbaseurl The base URL for the group action.
+     * @return string|null The raw HTML to render.
+     */
+    public function group_selector(object $course, ?string $groupactionbaseurl = null): ?string {
+        global $USER;
+
+        // Make sure that group mode is enabled.
+        if (!$groupmode = $course->groupmode) {
+            return null;
+        }
+
+        $label = $groupmode == VISIBLEGROUPS ? get_string('selectgroupsvisible') :
+            get_string('selectgroupsseparate');
+
+        $data = [
+            'label' => $label,
+            'courseid' => $course->id,
+            'groupactionbaseurl' => $groupactionbaseurl
+        ];
+
+        $context = context_course::instance($course->id);
+
+        if ($groupmode == VISIBLEGROUPS || has_capability('moodle/site:accessallgroups', $context)) {
+            $allowedgroups = groups_get_all_groups($course->id, 0, $course->defaultgroupingid);
+        } else {
+            $allowedgroups = groups_get_all_groups($course->id, $USER->id, $course->defaultgroupingid);
+        }
+
+        $activegroup = groups_get_course_group($course, true, $allowedgroups);
+
+        if ($activegroup) {
+            $group = groups_get_group($activegroup);
+            $data['selectedgroup'] = $group->name;
+        } else if ($activegroup === 0) {
+            $data['selectedgroup'] = get_string('allparticipants');
+        }
+
+        $this->page->requires->js_call_amd('core_grades/searchwidget/group', 'init');
+        return $this->render_from_template('core_grades/group_selector', $data);
+    }
 }
diff --git a/grade/templates/group_selector.mustache b/grade/templates/group_selector.mustache
new file mode 100644
index 00000000000..7adef07653d
--- /dev/null
+++ b/grade/templates/group_selector.mustache
@@ -0,0 +1,49 @@
+{{!
+    This file is part of Moodle - http://moodle.org/
+
+    Moodle 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 3 of the License, or
+    (at your option) any later version.
+
+    Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.
+}}
+{{!
+    @template core_grades/group_selector
+
+    The group selector trigger element.
+
+    Context variables required for this template:
+    * label - The label text fot the group selector element.
+    * courseid - The course ID.
+    * groupactionbaseurl - The base URL for the group action.
+    * selectedgroup - The text of the selected group option.
+
+    Example context (json):
+    {
+        "label": "Select separate groups",
+        "courseid": "2",
+        "groupactionbaseurl": "index.php?item=test",
+        "selectedgroup": "Group 1"
+    }
+}}
+<div class="group-selector d-flex">
+    <div role="button" class="groupwidget btn dropdown-toggle d-flex text-left align-items-center p-0" data-courseid="{{courseid}}" data-action-base-url="{{groupactionbaseurl}}" data-searchtype="group" tabindex="0">
+        <div class="align-items-center d-flex">
+            <div class="d-block pr-3">
+                <span class="d-block small">
+                    {{label}}
+                </span>
+                <span class="p-0 font-weight-bold">
+                    {{selectedgroup}}
+                </span>
+            </div>
+        </div>
+    </div>
+</div>
diff --git a/lang/en/moodle.php b/lang/en/moodle.php
index c36f447ff46..c436ec1d28e 100644
--- a/lang/en/moodle.php
+++ b/lang/en/moodle.php
@@ -1939,6 +1939,8 @@ $string['selectedcategories'] = 'Selected categories';
 $string['selectednowmove'] = '{$a} files selected for moving. Now go into the destination folder and press \'Move files to here\'';
 $string['selectfiles'] = 'Select files';
 $string['selectfiltertype'] = 'Select';
+$string['selectgroupsseparate'] = 'Select separate groups';
+$string['selectgroupsvisible'] = 'Select visible groups';
 $string['selectitem'] = 'Select \'{$a}\'';
 $string['selectmoduletoviewhelp'] = 'Select an activity or resource to view its help.