feat: polish sortable header rendering

docs/architecture.md

@@ -1081,6 +1081,20 @@ table table-striped table-hover align-middle mb-0
 
 The responsive wrapper is enabled by default through `table-responsive`.
 
+### Sortable header visual polish
+
+Sortable headers render a clearer Bootstrap-friendly control.
+
+The current implementation uses dependency-free textual indicators:
+
+- `↕` for sortable but unsorted columns;
+- `↑` for ascending sort;
+- `↓` for descending sort.
+
+The active column still exposes `aria-sort`.
+
+The visual indicator is marked `aria-hidden="true", while the accessible state remains available through visually hidden text and ARIA attributes.
+
 ### Bootstrap rendering defaults
 
 Bootstrap table display variants can be configured globally.

docs/table-controls.md

@@ -244,6 +244,22 @@ Next
 Go to page 2
 ```
 
+## Sortable header indicators
+
+Sortable headers include visual indicators:
+
+```text
+↕ unsorted
+↑ ascending
+↓ descending
+```
+
+These indicators do not require an icon library.
+
+The active sorted column also exposes `aria-sort`.
+
+The indicator is decorative and hidden from assistive technologies.
+
 ## Loading state
 
 During Ajax refresh, the controller:

templates/bootstrap/_header.html.twig

@@ -5,19 +5,24 @@
     <tr>
         {% for column in visibleColumns %}
             {% set is_current_sort = column.name == current_sort_field %}
+            {% set aria_sort = null %}
+            {% if is_current_sort %}
+                {% set aria_sort = current_sort_direction == 'desc' ? 'descending' : 'ascending' %}
+            {% endif %}
+
             <th
                 {% if column.className is not null %}
                     class="{{ column.className }}"
                 {% endif %}
                 scope="col"
-                {% if is_current_sort %}
-                    aria-sort="{{ current_sort_direction == 'desc' ? 'descending' : 'ascending' }}"
+                {% if aria_sort is not null %}
+                    aria-sort="{{ aria_sort }}"
                 {% endif %}
             >
                 {% if column.sortable %}
                     <button
                         type="button"
-                        class="btn btn-link p-0 text-decoration-none{% if is_current_sort %} active{% endif %}"
+                        class="btn btn-link p-0 text-decoration-none d-inline-flex align-items-center gap-1 zhortein-datatable__sort-button{% if is_current_sort %} active{% endif %}"
                         data-action="zhortein--datatable-bundle--datatable#sort"
                         data-zhortein--datatable-bundle--datatable-field-param="{{ column.name }}"
                         data-zhortein--datatable-bundle--datatable-current-sort-param="{{ is_current_sort ? 'true' : 'false' }}"
@@ -26,7 +31,19 @@
                             '%column%': column.label ?? column.name
                         }, 'zhortein_datatable') }}"
                     >
-                        {{ column.label ?? column.name }}
+                        <span class="zhortein-datatable__sort-label">
+                            {{ column.label ?? column.name }}
+                        </span>
+
+                        <span class="zhortein-datatable__sort-indicator text-body-secondary" aria-hidden="true">
+                            {% if is_current_sort and current_sort_direction == 'desc' %}
+                                ↓
+                            {% elseif is_current_sort %}
+                                ↑
+                            {% else %}
+                                ↕
+                            {% endif %}
+                        </span>
 
                         {% if is_current_sort %}
                             <span class="visually-hidden">
@@ -42,7 +59,7 @@
 
         {% if hasRowActions %}
             <th class="text-end" scope="col">
-                {{ 'zhortein_datatable.actions.more'|trans({}, 'zhortein_datatable') }}
+                {{ 'zhortein_datatable.actions.label'|trans({}, 'zhortein_datatable') }}
             </th>
         {% endif %}
     </tr>

tests/Unit/Renderer/DatatableRendererSortableHeaderPolishTest.php

@@ -0,0 +1,105 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Zhortein\DatatableBundle\Tests\Unit\Renderer;
+
+use PHPUnit\Framework\TestCase;
+use Twig\Environment;
+use Twig\Loader\FilesystemLoader;
+use Zhortein\DatatableBundle\Definition\DatatableDefinition;
+use Zhortein\DatatableBundle\Renderer\DatatableRenderer;
+
+final class DatatableRendererSortableHeaderPolishTest extends TestCase
+{
+    use TranslatableRendererTestTrait;
+
+    public function test_it_renders_neutral_sort_indicator_for_sortable_columns_without_active_sort(): void
+    {
+        $html = $this->createRenderer()->renderHeader($this->createDefinition());
+
+        self::assertStringContainsString('data-zhortein--datatable-bundle--datatable-target="header"', $html);
+        self::assertStringContainsString('zhortein-datatable__sort-button', $html);
+        self::assertStringContainsString('zhortein-datatable__sort-indicator', $html);
+        self::assertStringContainsString('↕', $html);
+        self::assertStringContainsString('data-action="zhortein--datatable-bundle--datatable#sort"', $html);
+        self::assertStringContainsString('data-zhortein--datatable-bundle--datatable-field-param="e.email"', $html);
+        self::assertStringContainsString('data-zhortein--datatable-bundle--datatable-current-sort-param="false"', $html);
+        self::assertStringNotContainsString('aria-sort=', $html);
+    }
+
+    public function test_it_renders_ascending_sort_indicator_for_current_sort_column(): void
+    {
+        $html = $this->createRenderer()->renderHeader($this->createDefinition(), [
+            'sortField' => 'e.email',
+            'sortDirection' => 'asc',
+        ]);
+
+        self::assertStringContainsString('aria-sort="ascending"', $html);
+        self::assertStringContainsString('data-zhortein--datatable-bundle--datatable-current-sort-param="true"', $html);
+        self::assertStringContainsString('data-zhortein--datatable-bundle--datatable-sort-direction-param="asc"', $html);
+        self::assertStringContainsString('↑', $html);
+        self::assertStringContainsString('sorted ascending', $html);
+        self::assertStringContainsString('active', $html);
+    }
+
+    public function test_it_renders_descending_sort_indicator_for_current_sort_column(): void
+    {
+        $html = $this->createRenderer()->renderHeader($this->createDefinition(), [
+            'sortField' => 'e.email',
+            'sortDirection' => 'desc',
+        ]);
+
+        self::assertStringContainsString('aria-sort="descending"', $html);
+        self::assertStringContainsString('data-zhortein--datatable-bundle--datatable-sort-direction-param="desc"', $html);
+        self::assertStringContainsString('↓', $html);
+        self::assertStringContainsString('sorted descending', $html);
+    }
+
+    public function test_non_sortable_columns_remain_static(): void
+    {
+        $html = $this->createRenderer()->renderHeader($this->createDefinition());
+
+        self::assertStringContainsString('Created at', $html);
+        self::assertStringNotContainsString('data-zhortein--datatable-bundle--datatable-field-param="e.createdAt"', $html);
+    }
+
+    public function test_it_preserves_header_column_class(): void
+    {
+        $html = $this->createRenderer()->renderHeader($this->createDefinition());
+
+        self::assertStringContainsString('class="text-end"', $html);
+    }
+
+    private function createDefinition(): DatatableDefinition
+    {
+        $definition = new DatatableDefinition('users');
+
+        $definition
+            ->addColumn('e.email', label: 'Email')
+            ->addColumn('e.createdAt', label: 'Created at', sortable: false, className: 'text-end')
+        ;
+
+        return $definition;
+    }
+
+    private function createRenderer(): DatatableRenderer
+    {
+        return new DatatableRenderer($this->createTwigEnvironment());
+    }
+
+    private function createTwigEnvironment(): Environment
+    {
+        $loader = new FilesystemLoader();
+        $loader->addPath(__DIR__.'/../../../templates', 'ZhorteinDatatable');
+
+        $twig = new Environment($loader, [
+            'strict_variables' => true,
+            'autoescape' => 'html',
+        ]);
+
+        $this->addTranslationExtension($twig);
+
+        return $twig;
+    }
+}