[61] Re-introduce block editor visual preview

docs/README.md

@@ -18,7 +18,7 @@ Themer is a WordPress plugin that provides a UI for users to edit the [theme.jso
 
 ### Prerequisites
 
--   **WordPress:** 6.2
+-   **WordPress:** 6.4
 -   **PHP:** 8.0
 
 ### Via Composer

inc/class-admin.php

@@ -18,6 +18,34 @@ public function __construct() {
 		add_action( 'admin_menu', array( $this, 'create_admin_screen' ), 1 );
 	}
 
+	/**
+	 * Enqueue any required assets for the plugin.
+	 *
+	 * @return void
+	 */
+	public function enqueue_assets() : void {
+
+		$plugin_name = basename( THEMER_DIR );
+		$asset_file  = include THEMER_DIR . '/build/index.asset.php';
+
+		wp_enqueue_style( 'wp-components' );
+
+		wp_enqueue_script(
+			'themer',
+			plugins_url( $plugin_name . '/build/index.js', $plugin_name ),
+			$asset_file['dependencies'],
+			$asset_file['version'],
+			false
+		);
+
+		wp_enqueue_style(
+			'themer',
+			plugins_url( $plugin_name . '/build/index.css', $plugin_name ),
+			array(),
+			$asset_file['version']
+		);
+	}
+
 	/**
 	 * Create an admin screen for theme settings.
 	 *
@@ -29,16 +57,15 @@ public function create_admin_screen() : void {
 			'Styles Editor',
 			'edit_theme_options',
 			'styles_editor',
-			array( $this, 'theme_render_settings' ),
+			array( $this, 'render_settings_page' ),
 		);
 	}
 
 	/**
 	 * Render the content for the theme settings page.
 	 */
-	public function theme_render_settings() {
-		?>
-	<div id="themer-admin-screen" class="theme-settings-page-wrapper wrap"></div>
-		<?php
+	public function render_settings_page() {
+		$this->enqueue_assets();
+		require __DIR__ . '/edit-form-themer.php';
 	}
 }

inc/edit-form-themer.php

@@ -0,0 +1,127 @@
+<?php
+/**
+ * A page template for displaying the themer admin page.
+ *
+ * Handles the enqueing of block editor assets and initialization of the editor within themer view.
+ *
+ * Adapted from wp-admin/edit-form-blocks.php
+ *
+ * @package themer
+ */
+
+declare( strict_types = 1 );
+
+if ( ! defined( 'ABSPATH' ) ) {
+	die( '-1' );
+}
+
+global $editor_styles;
+
+/** WordPress Administration Bootstrap */
+require_once ABSPATH . 'wp-admin/admin.php';
+
+if ( ! current_user_can( 'edit_theme_options' ) ) {
+	wp_die(
+		esc_html( '<h1>' . __( 'You need a higher level of permission.', 'default' ) . '</h1>' ) .
+		esc_html( '<p>' . __( 'Sorry, you are not allowed to edit styles on this site.', 'themer' ) . '</p>' ),
+		403
+	);
+}
+
+if ( ! wp_is_block_theme() ) {
+	wp_die( esc_html__( 'The theme you are currently using is not compatible with the Site Editor.', 'default' ) );
+}
+
+$title = _x( 'Styles Editor', 'themer' ); // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- Required to set the page title for this view.
+
+$current_screen = get_current_screen(); // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- Required flag we're loading the block editor.
+$current_screen->is_block_editor( true );
+
+$block_editor_context = new WP_Block_Editor_Context( array( 'name' => 'core/edit-site' ) );
+
+/*
+ * Emoji replacement is disabled for now, until it plays nicely with React.
+ */
+remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
+
+/*
+ * Block editor implements its own Options menu for toggling Document Panels.
+ */
+add_filter( 'screen_options_show_screen', '__return_false' );
+
+// Preload server-registered block schemas.
+wp_add_inline_script(
+	'wp-blocks',
+	'wp.blocks.unstable__bootstrapServerSideBlockDefinitions(' . wp_json_encode( get_block_editor_server_block_settings() ) . ');'
+);
+
+$editor_settings = array(
+	'hasFixedToolbar'    => true,  // effectively hides the toolbar since we don't render the fixed toolbar in the themer view.
+	'templateLock'       => 'all', // prevents moving/removing blocks.
+	'richEditingEnabled' => false,
+	'codeEditingEnabled' => false,
+	'focusMode'          => false,
+	'enableCustomFields' => false,
+	'styles'             => get_block_editor_theme_styles(),
+);
+
+$active_global_styles_id = WP_Theme_JSON_Resolver::get_user_global_styles_post_id();
+$active_theme            = get_stylesheet();
+
+$preload_paths = array(
+	array( rest_get_route_for_post_type_items( 'attachment' ), 'OPTIONS' ),
+	array( rest_get_route_for_post_type_items( 'page' ), 'OPTIONS' ),
+	'/wp/v2/types?context=view',
+	'/wp/v2/types/wp_template?context=edit',
+	'/wp/v2/types/wp_template_part?context=edit',
+	'/wp/v2/templates?context=edit&per_page=-1',
+	'/wp/v2/template-parts?context=edit&per_page=-1',
+	'/wp/v2/themes?context=edit&status=active',
+	'/wp/v2/global-styles/' . $active_global_styles_id . '?context=edit',
+	'/wp/v2/global-styles/' . $active_global_styles_id,
+	'/wp/v2/global-styles/themes/' . $active_theme,
+	'themer/v1/styles',
+);
+
+block_editor_rest_api_preload( $preload_paths, $block_editor_context );
+
+$editor_settings = get_block_editor_settings( $editor_settings, $block_editor_context );
+
+// Add some custom styles.
+$editor_settings['styles'][] = array(
+	'css' => '
+		body { padding: 20px; }
+	',
+);
+
+$init_script = <<<JS
+( function() {
+	window._wpLoadBlockEditor = new Promise( function( resolve ) {
+		wp.domReady( function() {
+			resolve( themer.initializeEditor( 'themer-root', %s ) );
+		} );
+	} );
+} )();
+JS;
+
+$script = sprintf(
+	$init_script,
+	wp_json_encode( $editor_settings ),
+);
+
+wp_add_inline_script( 'themer', $script );
+
+wp_enqueue_style( 'wp-edit-post' );
+
+do_action( 'enqueue_block_editor_assets' );
+
+require_once ABSPATH . 'wp-admin/admin-header.php';
+?>
+
+<div class="block-editor">
+	<h1 class="screen-reader-text hide-if-no-js"><?php echo esc_html( $title ); ?></h1>
+	<div id="themer-root"></div>
+</div>
+
+<?php
+require_once ABSPATH . 'wp-admin/admin-footer.php';

inc/setup.php

@@ -13,7 +13,6 @@
  * @return void
  */
 function setup() : void {
-	new Loader();
 	new Admin();
 	new Rest_API();
 }