docs(animations): updated animation docs (#24206)

PR Close #24206

aio/content/examples/animations/src/app/app.component.ts

@@ -0,0 +1,47 @@
+// #docplaster
+// #docregion imports
+import { Component, HostBinding } from '@angular/core';
+import {
+  trigger,
+  state,
+  style,
+  animate,
+  transition,
+  // ...
+} from '@angular/animations';
+
+// #enddocregion imports
+import { RouterOutlet } from '@angular/router';
+import { slideInAnimation } from './animations';
+
+// #docregion decorator, toggle-app-animations, define
+@Component({
+  selector: 'app-root',
+  templateUrl: 'app.component.html',
+  styleUrls: ['app.component.css'],
+  animations: [
+// #enddocregion decorator
+    slideInAnimation
+// #docregion decorator
+    // animation triggers go here
+  ]
+})
+// #enddocregion decorator, define
+export class AppComponent {
+  @HostBinding('@.disabled')
+  public animationsDisabled = false;
+// #enddocregion toggle-app-animations
+
+// #docregion prepare-router-outlet
+  prepareRoute(outlet: RouterOutlet) {
+    return outlet && outlet.activatedRouteData && outlet.activatedRouteData['animation'];
+  }
+
+// #enddocregion prepare-router-outlet
+
+  toggleAnimations() {
+    this.animationsDisabled = !this.animationsDisabled;
+  }
+// #docregion toggle-app-animations
+}
+// #enddocregion toggle-app-animations