docs: add angular aria banner

docs/src/app/pages/component-viewer/component-overview.html

@@ -2,9 +2,10 @@
   <h2 class="cdk-visually-hidden" tabindex="-1">
     Overview for {{docItem.id}}
   </h2>
-  <doc-viewer [document]="getOverviewDocumentUrl(docItem)"
-      class="docs-component-view-text-content docs-component-overview"
-      (contentRendered)="updateTableOfContents('Overview Content', $event)" />
+  <doc-viewer [name]="docItem.id"
+    [document]="getOverviewDocumentUrl(docItem)"
+    class="docs-component-view-text-content docs-component-overview"
+    (contentRendered)="updateTableOfContents('Overview Content', $event)" />
 
   @if (showToc | async) {
     <table-of-contents #toc container=".mat-drawer-content"/>

docs/src/app/shared/doc-viewer/angular-aria-banner/angular-aria-banner.css

@@ -0,0 +1,43 @@
+.docs-angular-aria-banner {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  padding: 16px;
+  margin-bottom: 24px;
+  background-color: color-mix(in srgb, var(--mat-sys-primary) 10%, transparent);
+  border-left: 4px solid var(--mat-sys-primary);
+  border-radius: 4px;
+  font-size: 14px;
+  line-height: 1.6;
+}
+
+.docs-angular-aria-banner-icon {
+  font-size: 20px;
+  flex-shrink: 0;
+  fill: var(--mat-sys-primary);
+}
+
+.docs-angular-aria-banner-content {
+  flex: 1;
+}
+
+.docs-angular-aria-banner-content strong {
+  color: var(--mat-sys-primary);
+}
+
+.docs-angular-aria-banner-content a {
+  color: var(--mat-sys-primary);
+  text-decoration: underline;
+  font-weight: 500;
+}
+
+@media (max-width: 600px) {
+  .docs-angular-aria-banner {
+    padding: 12px;
+    gap: 8px;
+  }
+
+  .docs-angular-aria-banner-icon {
+    font-size: 18px;
+  }
+}

docs/src/app/shared/doc-viewer/angular-aria-banner/angular-aria-banner.html

@@ -0,0 +1,16 @@
+<div class="docs-angular-aria-banner">
+  <svg class="docs-angular-aria-banner-icon" xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24"
+    width="24px">
+    <path d="M0 0h24v24H0V0z" fill="none" />
+    <path
+      d="M11 7h2v2h-2zm0 4h2v6h-2zm1-9C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8z" />
+  </svg>
+  <div class="docs-angular-aria-banner-content">
+    <strong>Now Available in Angular Aria!</strong>
+    <br />
+    The Angular team has introduced a new low-level component library called Angular Aria.
+    Consider using the
+    <a [href]="ariaLink" target="_blank" rel="noopener">Angular Aria {{ componentName }}</a>
+    component as an alternative to this CDK component.
+  </div>
+</div>

docs/src/app/shared/doc-viewer/angular-aria-banner/angular-aria-banner.ts

@@ -0,0 +1,36 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import {Component, Input} from '@angular/core';
+
+/**
+ * Mapping of CDK component names to their Angular Aria documentation URLs.
+ */
+const ANGULAR_ARIA_LINKS: Record<string, string> = {
+  'listbox': 'https://angular.dev/guide/aria/listbox',
+  'tree': 'https://angular.dev/guide/aria/tree',
+  'accordion': 'https://angular.dev/guide/aria/accordion',
+  'menu': 'https://angular.dev/guide/aria/menu',
+};
+
+/**
+ * Banner component that guides users to use the new Angular Aria components for CDK components
+ * that have equivalent Angular Aria components.
+ */
+@Component({
+  selector: 'angular-aria-banner',
+  templateUrl: 'angular-aria-banner.html',
+  styleUrl: 'angular-aria-banner.css',
+})
+export class AngularAriaBanner {
+  @Input() componentName: string = '';
+
+  get ariaLink(): string {
+    return ANGULAR_ARIA_LINKS[this.componentName.toLowerCase()] || '';
+  }
+}

docs/src/app/shared/doc-viewer/doc-viewer.ts

@@ -38,6 +38,7 @@ import {ExampleViewer} from '../example-viewer/example-viewer';
 import {HeaderLink} from './header-link';
 import {DeprecatedFieldComponent} from './deprecated-tooltip';
 import {ModuleImportCopyButton} from './module-import-copy-button';
+import {AngularAriaBanner} from './angular-aria-banner/angular-aria-banner';
 
 @Injectable({providedIn: 'root'})
 class DocFetcher {
@@ -154,6 +155,9 @@ export class DocViewer implements OnDestroy {
     this._loadComponents('material-docs-example', ExampleViewer);
     this._loadComponents('header-link', HeaderLink);
 
+    // Inject Angular Aria banner for specific CDK components
+    this._injectAngularAriaBanner();
+
     // Create tooltips for the deprecated fields
     this._createTooltipsForDeprecated();
 
@@ -267,4 +271,37 @@ export class DocViewer implements OnDestroy {
       this._portalHosts.push(elementPortalOutlet);
     });
   }
+
+  /**
+   * Injects the Angular Aria migration banner for specific CDK components.
+   */
+  private _injectAngularAriaBanner() {
+    const componentName = this.name();
+    const componentsWithAriaBanner = ['listbox', 'tree', 'accordion', 'menu'];
+
+    if (!componentName || !componentsWithAriaBanner.includes(componentName.toLowerCase())) {
+      return;
+    }
+
+    // Create a container div for the banner at the beginning of the document
+    const bannerContainer = document.createElement('div');
+    bannerContainer.setAttribute('angular-aria-banner', '');
+    bannerContainer.setAttribute('componentName', componentName);
+
+    // Insert the banner at the beginning of the document content
+    const firstChild = this._elementRef.nativeElement.firstChild;
+    if (firstChild) {
+      this._elementRef.nativeElement.insertBefore(bannerContainer, firstChild);
+    } else {
+      this._elementRef.nativeElement.appendChild(bannerContainer);
+    }
+
+    // Create and attach the banner component
+    const portalHost = new DomPortalOutlet(bannerContainer, this._appRef, this._injector);
+    const bannerPortal = new ComponentPortal(AngularAriaBanner, this._viewContainerRef);
+    const bannerComponent = portalHost.attach(bannerPortal);
+    bannerComponent.instance.componentName = componentName;
+
+    this._portalHosts.push(portalHost);
+  }
 }