AlbumButtonBox: add way for users to select an album filter

templates/AlbumButtonBox.php

@@ -8,11 +8,15 @@
 
 class AlbumButtonBox extends Template
 {
+	private $active_filter;
 	private $buttons;
+	private $filters;
 
-	public function __construct($buttons)
+	public function __construct(array $buttons, array $filters, $active_filter)
 	{
+		$this->active_filter = $active_filter;
 		$this->buttons = $buttons;
+		$this->filters = $filters;
 	}
 
 	public function html_main()
@@ -25,6 +29,25 @@ class AlbumButtonBox extends Template
 				<a class="btn btn-light" href="', $button['url'], '">', $button['caption'], '</a>';
 
 		echo '
+				<div class="dropdown">
+					<button class="btn btn-light dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
+						<i class="bi bi-filter"></i>
+					</button>
+					<ul class="dropdown-menu">';
+
+		foreach ($this->filters as $key => $filter)
+		{
+			$is_active = $key === $this->active_filter;
+			echo '
+						<li><a class="dropdown-item', $is_active ? ' active' : '',
+							'" href="', $filter['link'], '">',
+							$filter['caption'],
+							'</a></li>';
+		}
+
+		echo '
+					</ul>
+				</div>
 			</div>';
 	}
 }