add nova

nova/src/Fields/DependentFields.php

@@ -0,0 +1,128 @@
+<?php
+
+namespace Laravel\Nova\Fields;
+
+use Illuminate\Support\Str;
+use Laravel\Nova\Http\Requests\NovaRequest;
+use Laravel\Nova\Support\UndefinedValue;
+
+/**
+ * @property array $fieldDependencies
+ */
+trait DependentFields
+{
+    /**
+     * Determine of should emit change event.
+     *
+     * @var bool
+     */
+    protected $dependentShouldEmitChangesEvent = false;
+
+    /**
+     * Resolve the dependent component key.
+     *
+     * @return string
+     */
+    public function dependentComponentKey()
+    {
+        return sprintf('%s.%s.%s', Str::slug(class_basename(get_called_class())), $this->component, $this->attribute);
+    }
+
+    /**
+     * Resolve dependent field value.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return mixed
+     */
+    public function resolveDependentValue(NovaRequest $request)
+    {
+        return $this->value ?? $this->resolveDefaultValue($request);
+    }
+
+    /**
+     * Sync depends on logic.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return $this
+     */
+    public function syncDependsOn(NovaRequest $request)
+    {
+        $this->value = new UndefinedValue();
+        $this->defaultCallback = function () {
+            return new UndefinedValue();
+        };
+
+        $this->applyDependsOn($request);
+
+        $value = with($this->value, function ($value) use ($request) {
+            if ($value instanceof UndefinedValue && $this->requestShouldResolveDefaultValue($request)) {
+                $this->value = null;
+
+                return $this->resolveDefaultValue($request);
+            }
+
+            return $value;
+        });
+
+        $this->dependentShouldEmitChangesEvent = ! $value instanceof UndefinedValue;
+
+        if ($value instanceof UndefinedValue) {
+            $this->value = null;
+        } else {
+            $this->value = ! is_null($value) ? $value : '';
+        }
+
+        return $this;
+    }
+
+    /**
+     * Apply depends on logic.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return $this
+     */
+    public function applyDependsOn(NovaRequest $request)
+    {
+        $this->fieldDependencies = collect($this->fieldDependencies ?? [])
+            ->map(function (Dependent $dependent) use ($request) {
+                return $dependent->handle($this, $request);
+            })->all();
+
+        return $this;
+    }
+
+    /**
+     * Get depends on attributes.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return array<string, mixed>|null
+     */
+    protected function getDependentsAttributes(NovaRequest $request)
+    {
+        /** @var \Illuminate\Support\Collection<string, mixed> $attributes */
+        $attributes = collect($this->fieldDependencies ?? [])->map(function (Dependent $dependent) {
+            return $dependent->getAttributes();
+        })->collapse();
+
+        if ($attributes->isNotEmpty()) {
+            return $attributes->all();
+        }
+
+        return null;
+    }
+
+    /**
+     * Serialize dependent field.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return array<string, mixed>
+     */
+    protected function serializeDependentField(NovaRequest $request): array
+    {
+        return [
+            'dependentComponentKey' => $this->dependentComponentKey(),
+            'dependsOn' => $this->getDependentsAttributes($request),
+            'dependentShouldEmitChangesEvent' => $this->dependentShouldEmitChangesEvent,
+        ];
+    }
+}