Form file field add hidePreview method

Author: z-song

src/Form/Field/File.php

@@ -144,6 +144,18 @@ protected function preview()
         return $this->objectUrl($this->value);
     }
 
+    /**
+     * Hides the file preview.
+     *
+     * @return $this
+     */
+    public function hidePreview()
+    {
+        return $this->options([
+            'showPreview' => false
+        ]);
+    }
+
     /**
      * Initialize the caption.
      *