first commit

lib/pkp/classes/controllers/grid/NullGridCellProvider.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * @file classes/controllers/grid/NullGridCellProvider.php
+ *
+ * Copyright (c) 2014-2021 Simon Fraser University
+ * Copyright (c) 2000-2021 John Willinsky
+ * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
+ *
+ * @class NullGridCellProvider
+ *
+ * @ingroup controllers_grid
+ *
+ * @brief Class to return null when render method is called by a grid handler.
+ * Use this when you want to create a column with no content at all (for layout
+ * purposes using flags, for example).
+ */
+
+namespace PKP\controllers\grid;
+
+class NullGridCellProvider extends GridCellProvider
+{
+    //
+    // Template methods from GridCellProvider
+    //
+    /**
+     * @see GridCellProvider::render()
+     */
+    public function render($request, $row, $column)
+    {
+        return null;
+    }
+}
+
+if (!PKP_STRICT_MODE) {
+    class_alias('\PKP\controllers\grid\NullGridCellProvider', '\NullGridCellProvider');
+}