first commit

wp-content/plugins/elementor/modules/nested-elements/base/widget-nested-base.php

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+<?php
+namespace Elementor\Modules\NestedElements\Base;
+
+use Elementor\Plugin;
+use Elementor\Widget_Base;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Used to create a new widget that can be nested inside other widgets.
+ */
+abstract class Widget_Nested_Base extends Widget_Base {
+
+	/**
+	 * Get default children elements structure.
+	 *
+	 * @return array
+	 */
+	abstract protected function get_default_children_elements();
+
+	/**
+	 * Get repeater title setting key name.
+	 *
+	 * @return string
+	 */
+	abstract protected function get_default_repeater_title_setting_key();
+
+	/**
+	 * Get default children title for the navigator, using `%d` as index in the format.
+	 *
+	 * @note The title in this method is used to set the default title for each created child in nested element.
+	 * for handling the children title for new created widget(s), use `get_default_children_elements()` method,
+	 * eg:
+	 * [
+	 *      'elType' => 'container',
+	 *      'settings' => [
+	 *          '_title' => __( 'Tab #1', 'elementor' ),
+	 *      ],
+	 * ],
+	 * @return string
+	 */
+	protected function get_default_children_title() {
+		return esc_html__( 'Item #%d', 'elementor' );
+	}
+
+	/**
+	 * Get default children placeholder selector, Empty string, means will be added at the end view.
+	 *
+	 * @return string
+	 */
+	protected function get_default_children_placeholder_selector() {
+		return '';
+	}
+
+	protected function get_default_children_container_placeholder_selector() {
+		return '';
+	}
+
+	protected function is_dynamic_content(): bool {
+		return false;
+	}
+
+	/**
+	 * @inheritDoc
+	 *
+	 * To support nesting.
+	 */
+	protected function _get_default_child_type( array $element_data ) {
+		return Plugin::$instance->elements_manager->get_element_types( $element_data['elType'] );
+	}
+
+	/**
+	 * @inheritDoc
+	 *
+	 * Adding new 'defaults' config for handling children elements.
+	 */
+	protected function get_initial_config() {
+		return array_merge( parent::get_initial_config(), [
+			'defaults' => [
+				'elements' => $this->get_default_children_elements(),
+				'elements_title' => $this->get_default_children_title(),
+				'elements_placeholder_selector' => $this->get_default_children_placeholder_selector(),
+				'child_container_placeholder_selector' => $this->get_default_children_container_placeholder_selector(),
+				'repeater_title_setting' => $this->get_default_repeater_title_setting_key(),
+			],
+			'support_nesting' => true,
+		] );
+	}
+
+	/**
+	 * @inheritDoc
+	 *
+	 * Each element including its children elements.
+	 */
+	public function get_raw_data( $with_html_content = false ) {
+		$elements = [];
+		$data = $this->get_data();
+
+		$children = $this->get_children();
+
+		foreach ( $children as $child ) {
+			$child_raw_data = $child->get_raw_data( $with_html_content );
+
+			$elements[] = $child_raw_data;
+		}
+
+		return [
+			'id' => $this->get_id(),
+			'elType' => $data['elType'],
+			'widgetType' => $data['widgetType'],
+			'settings' => $data['settings'],
+			'elements' => $elements,
+		];
+	}
+
+	/**
+	 * Print child, helper method to print the child element.
+	 *
+	 * @param int $index
+	 */
+	public function print_child( $index ) {
+		$children = $this->get_children();
+
+		if ( ! empty( $children[ $index ] ) ) {
+			$children[ $index ]->print_element();
+		}
+	}
+
+	protected function content_template_single_repeater_item() {}
+
+	public function print_template() {
+		parent::print_template();
+		if ( $this->get_initial_config()['support_improved_repeaters'] ?? false ) {
+			?>
+			<script type="text/html" id="tmpl-elementor-<?php echo esc_attr( $this->get_name() ); ?>-content-single">
+				<?php $this->content_template_single_repeater_item(); ?>
+			</script>
+			<?php
+		}
+	}
+}

wp-content/plugins/elementor/modules/nested-elements/controls/control-nested-repeater.php

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+<?php
+namespace Elementor\Modules\NestedElements\Controls;
+
+use Elementor\Control_Repeater;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
+/**
+ * Changing the default repeater control behavior for custom item title defaults.
+ * For custom management of nested repeater controls.
+ */
+class Control_Nested_Repeater extends Control_Repeater {
+
+	const CONTROL_TYPE = 'nested-elements-repeater';
+
+	public function get_type() {
+		return static::CONTROL_TYPE;
+	}
+}

wp-content/plugins/elementor/modules/nested-elements/module.php

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+<?php
+namespace Elementor\Modules\NestedElements;
+
+use Elementor\Core\Experiments\Manager as Experiments_Manager;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
+class Module extends \Elementor\Core\Base\Module {
+
+	const EXPERIMENT_NAME = 'nested-elements';
+
+	public static function get_experimental_data() {
+		return [
+			'name' => self::EXPERIMENT_NAME,
+			'title' => esc_html__( 'Nested Elements', 'elementor' ),
+			'description' => sprintf(
+				'%1$s <a href="https://go.elementor.com/wp-dash-nested-elements/" target="_blank">%2$s</a>',
+				esc_html__( 'Create a rich user experience by layering widgets together inside "Nested" Tabs, etc. When turned on, we’ll automatically enable new nested features. Your old widgets won’t be affected.', 'elementor' ),
+				esc_html__( 'Learn more', 'elementor' )
+			),
+			'release_status' => Experiments_Manager::RELEASE_STATUS_BETA,
+			'default' => Experiments_Manager::STATE_INACTIVE,
+			'dependencies' => [
+				'container',
+			],
+			'new_site' => [
+				'default_active' => false,
+				'minimum_installation_version' => '3.10.0',
+			],
+		];
+	}
+
+	public function get_name() {
+		return 'nested-elements';
+	}
+
+	public function __construct() {
+		parent::__construct();
+
+		add_action( 'elementor/controls/register', function ( $controls_manager ) {
+			$controls_manager->register( new Controls\Control_Nested_Repeater() );
+		} );
+
+		add_action( 'elementor/editor/before_enqueue_scripts', function () {
+			wp_enqueue_script( $this->get_name(), $this->get_js_assets_url( $this->get_name() ), [
+				'elementor-common',
+			], ELEMENTOR_VERSION, true );
+		} );
+	}
+}