Document show order API

docs/php/api/show_order.md

@@ -0,0 +1,128 @@
+
+# Show Order
+
+Based on the generic show order implementation, users can be given the option of reordering entries using drag & drop.
+
+## Backend Implementation
+
+The backend must provide two RPC endpoints.
+
+The first endpoint returns the list of entries according to the current show order:
+
+```php
+<?php
+
+namespace wcf\system\endpoint\controller\foo;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use wcf\system\endpoint\GetRequest;
+use wcf\system\endpoint\IController;
+use wcf\system\exception\IllegalLinkException;
+use wcf\system\showOrder\ShowOrderHandler;
+use wcf\system\showOrder\ShowOrderItem;
+use wcf\system\WCF;
+
+#[GetRequest('/your-endpoint/show-order')]
+final class GetShowOrder implements IController
+{
+    public function __invoke(ServerRequestInterface $request, array $variables): ResponseInterface
+    {
+        WCF::getSession()->checkPermissions(["admin.foo.canManageFoo"]);
+
+        $list = new FooList();
+        $list->sqlOrderBy = 'showOrder ASC';
+        $list->readObjects();
+
+        $items = \array_map(
+            static fn($object) => new ShowOrderItem(
+                $object->getObjectID(),
+                $object->getName()
+            ),
+            $list->getObjects()
+        );
+
+        return (new ShowOrderHandler($items))->toJsonResponse();
+    }
+}
+```
+
+The second endpoint accepts the new show order and saves it.
+
+```php
+<?php
+
+namespace wcf\system\endpoint\controller\foo;
+
+use Laminas\Diactoros\Response\JsonResponse;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use wcf\system\endpoint\IController;
+use wcf\system\endpoint\PostRequest;
+use wcf\system\exception\IllegalLinkException;
+use wcf\system\showOrder\ShowOrderHandler;
+use wcf\system\showOrder\ShowOrderItem;
+use wcf\system\WCF;
+
+#[PostRequest('/your-endpoint/show-order')]
+final class ChangeShowOrder implements IController
+{
+    public function __invoke(ServerRequestInterface $request, array $variables): ResponseInterface
+    {
+        WCF::getSession()->checkPermissions(["admin.foo.canManageFoo"]);
+
+        $list = new FooList();
+        $list->sqlOrderBy = 'showOrder ASC';
+        $list->readObjects();
+
+        $items = \array_map(
+            static fn($object) => new ShowOrderItem(
+                $object->getObjectID(),
+                $object->getName()
+            ),
+            $list->getObjects()
+        );
+
+        $sortedItems = (new ShowOrderHandler($items))->getSortedItemsFromRequest($request);
+        $this->saveShowOrder($sortedItems);
+
+        return new JsonResponse([]);
+    }
+
+    /**
+     * @param list<ShowOrderItem> $items
+     */
+    private function saveShowOrder(array $items): void
+    {
+        WCF::getDB()->beginTransaction();
+        $sql = "UPDATE  wcf1_foo
+                SET     showOrder = ?
+                WHERE   id = ?";
+        $statement = WCF::getDB()->prepare($sql);
+        for ($i = 0, $length = \count($items); $i < $length; $i++) {
+            $statement->execute([
+                $i + 1,
+                $items[$i]->id,
+            ]);
+        }
+        WCF::getDB()->commitTransaction();
+    }
+}
+```
+
+## Frontend Implementation
+
+```smarty
+<button type="button" class="button jsChangeShowOrder">{icon name='up-down'} <span>{lang}wcf.global.changeShowOrder{/lang}</span></button>
+
+<script data-relocate="true">
+	require(["WoltLabSuite/Core/Component/ChangeShowOrder"], ({ setup }) => {
+		{jsphrase name='wcf.global.changeShowOrder'}
+
+		setup(
+			document.querySelector('.jsChangeShowOrder'),
+			'your-endpoint/show-order',
+		);
+	});
+</script>
+```

mkdocs.yml

@@ -61,6 +61,7 @@ nav:
           - 'Interactions': 'php/api/interactions.md'
           - 'List Views': 'php/api/list_views.md'
           - 'Package Installation Plugins': 'php/api/package_installation_plugins.md'
+          - 'Show Order': 'php/api/show_order.md'
           - 'RPC API':
               - 'Overview': 'php/api/rpc_api.md'
               - 'Endpoints': 'php/api/rpc_api_endpoints.md'