add nova

nova/src/Fields/PeekableFields.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Laravel\Nova\Fields;
+
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+trait PeekableFields
+{
+    /**
+     * Indicates whether to show the field in the modal preview.
+     *
+     * @var (callable(\Laravel\Nova\Http\Requests\NovaRequest):(bool))|bool
+     */
+    public $showWhenPeeking = false;
+
+    /**
+     * Show the field in the modal preview.
+     *
+     * @param  (callable(\Laravel\Nova\Http\Requests\NovaRequest):(bool))|bool  $callback
+     * @return $this
+     */
+    public function showWhenPeeking($callback = true)
+    {
+        $this->showWhenPeeking = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Determine if the field is to be shown in the preview modal.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return bool
+     */
+    public function isShownWhenPeeking(NovaRequest $request): bool
+    {
+        if (is_callable($this->showWhenPeeking)) {
+            $this->showWhenPeeking = call_user_func($this->showWhenPeeking, $request);
+        }
+
+        return $this->showWhenPeeking;
+    }
+}