feat: add Field::displayIf method

src/Dto/FieldDto.php

@@ -54,6 +54,7 @@ final class FieldDto
     /** @internal */
     private $uniqueId;
     private KeyValueStore $displayedOn;
+    private $displayCallable;
     private array $htmlAttributes = [];
 
     public function __construct()
@@ -478,6 +479,16 @@ public function isDisplayedOn(string $pageName): bool
         return $this->displayedOn->has($pageName);
     }
 
+    public function isDisplayed(?EntityDto $entityDto = null): bool
+    {
+        return null === $this->displayCallable || (bool) \call_user_func($this->displayCallable, $entityDto?->getInstance());
+    }
+
+    public function setDisplayCallable(callable $displayCallable): void
+    {
+        $this->displayCallable = $displayCallable;
+    }
+
     public function getHtmlAttributes(): array
     {
         return $this->htmlAttributes;

src/Factory/FieldFactory.php

@@ -78,7 +78,9 @@ public function processFields(EntityDto $entityDto, FieldCollection $fields): vo
         $isDetailOrIndex = \in_array($currentPage, [Crud::PAGE_INDEX, Crud::PAGE_DETAIL], true);
         foreach ($fields as $fieldDto) {
             if ((null !== $currentPage && false === $fieldDto->isDisplayedOn($currentPage))
-                || false === $this->authorizationChecker->isGranted(Permission::EA_VIEW_FIELD, $fieldDto)) {
+                || false === $fieldDto->isDisplayed($entityDto)
+                || false === $this->authorizationChecker->isGranted(Permission::EA_VIEW_FIELD, $fieldDto)
+            ) {
                 $fields->unset($fieldDto);
 
                 continue;

src/Field/FieldTrait.php

@@ -429,6 +429,13 @@ public function onlyWhenUpdating(): self
         return $this;
     }
 
+    public function displayIf(callable $callable): self
+    {
+        $this->dto->setDisplayCallable($callable);
+
+        return $this;
+    }
+
     /**
      * @param int|string $cols An integer with the number of columns that this field takes (e.g. 6),
      *                         or a string with responsive col CSS classes (e.g. 'col-6 col-sm-4 col-lg-3')