fix: Make MenuItem methods toggle classes immediately

core/menuitem.ts

@@ -12,7 +12,6 @@
 // Former goog.module ID: Blockly.MenuItem
 
 import * as aria from './utils/aria.js';
-import * as dom from './utils/dom.js';
 import * as idGenerator from './utils/idgenerator.js';
 
 /**
@@ -74,12 +73,6 @@ export class MenuItem {
 
     const content = document.createElement('div');
     content.className = 'blocklyMenuItemContent';
-    // Add a checkbox for checkable menu items.
-    if (this.checkable) {
-      const checkbox = document.createElement('div');
-      checkbox.className = 'blocklyMenuItemCheckbox ';
-      content.appendChild(checkbox);
-    }
 
     let contentDom: Node = this.content as HTMLElement;
     if (typeof this.content === 'string') {
@@ -88,6 +81,11 @@ export class MenuItem {
     content.appendChild(contentDom);
     element.appendChild(content);
 
+    // Add a checkbox for checkable menu items.
+    if (this.checkable) {
+      this.toggleCheckbox(true);
+    }
+
     // Initialize ARIA role and state.
     if (this.roleName) {
       aria.setRole(element, this.roleName);
@@ -145,6 +143,7 @@ export class MenuItem {
    */
   setRightToLeft(rtl: boolean) {
     this.rightToLeft = rtl;
+    this.getElement()?.classList.toggle('blocklyMenuItemRtl', this.rightToLeft);
   }
 
   /**
@@ -166,6 +165,12 @@ export class MenuItem {
    */
   setCheckable(checkable: boolean) {
     this.checkable = checkable;
+
+    if (!this.checkable) {
+      this.setChecked(false);
+    }
+
+    this.toggleCheckbox(checkable);
   }
 
   /**
@@ -175,7 +180,14 @@ export class MenuItem {
    * @internal
    */
   setChecked(checked: boolean) {
+    if (checked && !this.checkable) return;
+
     this.checked = checked;
+    const element = this.getElement();
+    if (element) {
+      element.classList.toggle('blocklyMenuItemSelected', this.checked);
+      aria.setState(element, aria.State.SELECTED, this.checked);
+    }
   }
 
   /**
@@ -186,15 +198,10 @@ export class MenuItem {
    */
   setHighlighted(highlight: boolean) {
     this.highlight = highlight;
-    const el = this.getElement();
-    if (el && this.isEnabled()) {
-      const name = 'blocklyMenuItemHighlight';
-      if (highlight) {
-        dom.addClass(el, name);
-      } else {
-        dom.removeClass(el, name);
-      }
-    }
+    this.getElement()?.classList.toggle(
+      'blocklyMenuItemHighlight',
+      this.highlight,
+    );
   }
 
   /**
@@ -215,6 +222,11 @@ export class MenuItem {
    */
   setEnabled(enabled: boolean) {
     this.enabled = enabled;
+    const element = this.getElement();
+    if (element) {
+      element.classList.toggle('blocklyMenuItemDisabled', !this.enabled);
+      aria.setState(element, aria.State.DISABLED, !this.enabled);
+    }
   }
 
   /**
@@ -243,4 +255,33 @@ export class MenuItem {
   onAction(fn: (p1: MenuItem, menuSelectEvent: Event) => void, obj: object) {
     this.actionHandler = fn.bind(obj);
   }
+
+  /**
+   * Adds or removes the checkmark indicator on this menu item.
+   * The indicator is present even if this menu item is not checked, as long
+   * as it is checkable; its visibility is controlled with CSS.
+   *
+   * @param add True to add the checkmark indicator, false to remove it.
+   */
+  private toggleCheckbox(add: boolean) {
+    if (add) {
+      if (
+        this.getElement()?.querySelector(
+          '.blocklyMenuItemContent .blocklyMenuItemCheckbox',
+        )
+      ) {
+        return;
+      }
+
+      const checkbox = document.createElement('div');
+      checkbox.className = 'blocklyMenuItemCheckbox ';
+      this.getElement()
+        ?.querySelector('.blocklyMenuItemContent')
+        ?.prepend(checkbox);
+    } else {
+      this.getElement()
+        ?.querySelector('.blocklyMenuItemContent .blocklyMenuItemCheckbox')
+        ?.remove();
+    }
+  }
 }

tests/mocha/index.html

@@ -224,6 +224,7 @@
       import './blocks/lists_test.js';
       import './blocks/logic_ternary_test.js';
       import './blocks/loops_test.js';
+      import './menu_item_test.js';
       import './metrics_test.js';
       import './mutator_test.js';
       import './names_test.js';

tests/mocha/menu_item_test.js

@@ -0,0 +1,168 @@
+/**
+ * @license
+ * Copyright 2026 Raspberry Pi Foundation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import {assert} from '../../node_modules/chai/index.js';
+import {
+  sharedTestSetup,
+  sharedTestTeardown,
+} from './test_helpers/setup_teardown.js';
+
+suite('Menu items', function () {
+  setup(function () {
+    sharedTestSetup.call(this);
+    this.menuItem = new Blockly.MenuItem('Hello World');
+    this.menuItem.createDom();
+  });
+
+  teardown(function () {
+    sharedTestTeardown.call(this);
+  });
+
+  test('can be RTL', function () {
+    this.menuItem.setRightToLeft(true);
+    assert.isTrue(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemRtl'),
+    );
+  });
+
+  test('can be LTR', function () {
+    this.menuItem.setRightToLeft(false);
+    assert.isFalse(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemRtl'),
+    );
+  });
+
+  test('can be checked', function () {
+    this.menuItem.setCheckable(true);
+    this.menuItem.setChecked(true);
+    assert.isTrue(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemSelected'),
+    );
+    assert.equal(
+      this.menuItem.getElement().getAttribute('aria-selected'),
+      'true',
+    );
+  });
+
+  test('cannot be checked when designated as uncheckable', function () {
+    this.menuItem.setCheckable(false);
+    this.menuItem.setChecked(true);
+    assert.isFalse(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemSelected'),
+    );
+    assert.equal(
+      this.menuItem.getElement().getAttribute('aria-selected'),
+      'false',
+    );
+  });
+
+  test('can be unchecked', function () {
+    this.menuItem.setCheckable(true);
+    this.menuItem.setChecked(false);
+    assert.isFalse(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemSelected'),
+    );
+    assert.equal(
+      this.menuItem.getElement().getAttribute('aria-selected'),
+      'false',
+    );
+  });
+
+  test('uncheck themselves when designated as non-checkable', function () {
+    this.menuItem.setChecked(true);
+    this.menuItem.setCheckable(false);
+
+    assert.isFalse(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemSelected'),
+    );
+    assert.equal(
+      this.menuItem.getElement().getAttribute('aria-selected'),
+      'false',
+    );
+  });
+
+  test('do not check themselves when designated as checkable', function () {
+    this.menuItem.setChecked(false);
+    this.menuItem.setCheckable(true);
+
+    assert.isFalse(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemSelected'),
+    );
+    assert.equal(
+      this.menuItem.getElement().getAttribute('aria-selected'),
+      'false',
+    );
+  });
+
+  test('adds a checkbox when designated as checkable', function () {
+    assert.isNull(
+      this.menuItem.getElement().querySelector('.blocklyMenuItemCheckbox'),
+    );
+    this.menuItem.setCheckable(true);
+    assert.isNotNull(
+      this.menuItem.getElement().querySelector('.blocklyMenuItemCheckbox'),
+    );
+  });
+
+  test('removes the checkbox when designated as uncheckable', function () {
+    this.menuItem.setCheckable(true);
+    assert.isNotNull(
+      this.menuItem.getElement().querySelector('.blocklyMenuItemCheckbox'),
+    );
+    this.menuItem.setCheckable(false);
+    assert.isNull(
+      this.menuItem.getElement().querySelector('.blocklyMenuItemCheckbox'),
+    );
+  });
+
+  test('can be highlighted', function () {
+    this.menuItem.setHighlighted(true);
+    assert.isTrue(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemHighlight'),
+    );
+  });
+
+  test('can be unhighlighted', function () {
+    this.menuItem.setHighlighted(false);
+    assert.isFalse(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemHighlight'),
+    );
+  });
+
+  test('can be enabled', function () {
+    this.menuItem.setEnabled(true);
+    assert.isTrue(this.menuItem.isEnabled());
+    assert.isFalse(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemDisabled'),
+    );
+    assert.equal(
+      this.menuItem.getElement().getAttribute('aria-disabled'),
+      'false',
+    );
+  });
+
+  test('can be disabled', function () {
+    this.menuItem.setEnabled(false);
+    assert.isFalse(this.menuItem.isEnabled());
+    assert.isTrue(
+      this.menuItem.getElement().classList.contains('blocklyMenuItemDisabled'),
+    );
+    assert.equal(
+      this.menuItem.getElement().getAttribute('aria-disabled'),
+      'true',
+    );
+  });
+
+  test('invokes its action callback', function () {
+    let called = false;
+    const callback = () => {
+      called = true;
+    };
+    this.menuItem.onAction(callback, this);
+    this.menuItem.performAction(new Event('click'));
+    assert.isTrue(called);
+  });
+});