12 files declare their use of HandlerBase in Drupal 9
- AreaPluginBase.php in core/
modules/ views/ src/ Plugin/ views/ area/ AreaPluginBase.php - ArgumentPluginBase.php in core/
modules/ views/ src/ Plugin/ views/ argument/ ArgumentPluginBase.php - FieldPluginBase.php in core/
modules/ views/ src/ Plugin/ views/ field/ FieldPluginBase.php - FilterPluginBase.php in core/
modules/ views/ src/ Plugin/ views/ filter/ FilterPluginBase.php - HandlerAllTest.php in core/
modules/ views/ tests/ src/ Functional/ Handler/ HandlerAllTest.php - HandlerBaseTest.php in core/
modules/ views/ tests/ src/ Unit/ Plugin/ HandlerBaseTest.php - Contains \Drupal\Tests\views\Unit\Plugin\HandlerBaseTest.
- HandlerTest.php in core/
modules/ views/ tests/ src/ Functional/ Handler/ HandlerTest.php - ManyToOneHelper.php in core/
modules/ views/ src/ ManyToOneHelper.php - RelationshipPluginBase.php in core/
modules/ views/ src/ Plugin/ views/ relationship/ RelationshipPluginBase.php - SortPluginBase.php in core/
modules/ views/ src/ Plugin/ views/ sort/ SortPluginBase.php - Sql.php in core/
modules/ views/ src/ Plugin/ views/ query/ Sql.php - ViewsHandlerManager.php in core/
modules/ views/ src/ Plugin/ ViewsHandlerManager.php