add group filter dropdown

Author: Timo Litzbarski

Plugin.php

@@ -108,8 +108,16 @@ public function initialize()
         $this->template->setTemplateOverride('task_modification/show', 'group_assign:task_modification/show');
 
         //Board
-         $this->template->hook->attach('template:board:private:task:before-title', 'group_assign:board/group');
-         $this->template->hook->attach('template:board:private:task:before-title', 'group_assign:board/multi');
+        $this->template->hook->attach('template:board:private:task:before-title', 'group_assign:board/group');
+        $this->template->hook->attach('template:board:private:task:before-title', 'group_assign:board/multi');
+        $groupmodel = $this->projectGroupRoleModel;
+        $this->template->hook->attachCallable('template:app:filters-helper:after', 'group_assign:board/filter', function($array = array()) use ($groupmodel) {
+            if(!empty($array) && $array['id'] >= 1){
+                return ['grouplist' => array_column($groupmodel->getGroups($array['id']), 'name')];
+            } else {
+                return ['grouplist' => array()];
+            }
+        });  
 
         //Filter
         $this->container->extend('taskLexer', function($taskLexer, $c) {

Template/board/filter.php

@@ -0,0 +1,12 @@
+<?php if (isset($grouplist) && !empty($grouplist)) : ?>
+</div>
+<div class="input-addon-item">
+    <div class="dropdown">
+        <a href="#" class="dropdown-menu dropdown-menu-link-icon" title="<?= t('Group filters') ?>"><i class="fa fa-users fa-fw"></i><i class="fa fa-caret-down"></i></a>
+        <ul>
+            <?php foreach ($grouplist as $group) : ?>
+            <li><a href="#" class="filter-helper" data-unique-filter='allassignees:"<?= $this->text->e($group) ?>"'><?= $this->text->e($group) ?></a></li>
+            <?php endforeach ?>
+        </ul>
+    </div>
+<?php endif ?>