feat(bootstrap): support for async APP_INITIALIZER and animated launch screens

e2e/animation-examples/app/app.module.ts

@@ -1,7 +1,8 @@
 import {
     NgModule,
     NO_ERRORS_SCHEMA,
-    NgModuleFactoryLoader
+    NgModuleFactoryLoader,
+    APP_INITIALIZER
 } from "@angular/core";
 
 import { NativeScriptModule } from "@nativescript/angular";
@@ -21,6 +22,14 @@ import { QueryStaggerComponent } from "./query-stagger.component";
 
 import { AppComponent } from "./app.component";
 
+export function asyncBoot(): Function {
+  return (): Promise<any> => new Promise(resolve => {
+    setTimeout(() => {
+      resolve();
+    }, 2000);
+  })
+}
+
 @NgModule({
     bootstrap: [
         AppComponent,
@@ -42,6 +51,16 @@ import { AppComponent } from "./app.component";
         NativeScriptAnimationsModule,
         AppRoutingModule,
     ],
+    /**
+     * Uncomment to test APP_INITIALIZER 
+     */
+    // providers: [
+    //   {
+    //     provide: APP_INITIALIZER,
+    //     useFactory: asyncBoot,
+    //     multi: true
+    //   },
+    // ],
     schemas: [NO_ERRORS_SCHEMA],
 })
 export class AppModule {}

e2e/animation-examples/app/main.ts

@@ -1,10 +1,103 @@
 import { platformNativeScriptDynamic } from "@nativescript/angular/platform";
 import { animationsTraceCategory } from "@nativescript/angular/trace";
 import { setCategories, enable } from "@nativescript/core/trace";
+import {
+  GridLayout,
+  ItemSpec,
+  GridUnitType,
+} from '@nativescript/core/ui/layouts/grid-layout';
+import {
+  HorizontalAlignment,
+  VerticalAlignment,
+} from '@nativescript/core/ui/enums/enums';
 
 import { AppModule } from "./app.module";
 
 setCategories(animationsTraceCategory);
 enable();
 
-platformNativeScriptDynamic().bootstrapModule(AppModule);
+class LaunchAnimation extends GridLayout {
+  circle: GridLayout;
+  animatedContainer: GridLayout;
+  finished = false;
+
+  constructor() {
+    super();
+
+    // setup container to house launch animation
+    this.animatedContainer = new GridLayout();
+    this.animatedContainer.style.zIndex = 100;
+    this.animatedContainer.backgroundColor = '#4caef7';
+    this.animatedContainer.className = 'w-full h-full';
+
+    // any creative animation can be put inside
+    this.circle = new GridLayout();
+    this.circle.width = 30;
+    this.circle.height = 30;
+    this.circle.borderRadius = 15;
+    this.circle.horizontalAlignment = HorizontalAlignment.center;
+    this.circle.verticalAlignment = VerticalAlignment.center;
+    this.circle.backgroundColor = '#fff';
+    this.animatedContainer.addRow(new ItemSpec(1, GridUnitType.STAR));
+    this.animatedContainer.addRow(new ItemSpec(1, GridUnitType.AUTO));
+    this.animatedContainer.addRow(new ItemSpec(1, GridUnitType.STAR));
+    GridLayout.setRow(this.circle, 1);
+    this.animatedContainer.addChild(this.circle);
+
+    // add animation to top row since booted app will insert into bottom row
+    GridLayout.setRow(this.animatedContainer, 1);
+    this.addChild(this.animatedContainer);
+  }
+
+  startAnimation() {
+    this.circle
+      .animate({
+        scale: { x: 2, y: 2 },
+        duration: 800,
+      })
+      .then(() => {
+        this.circle
+          .animate({
+            scale: { x: 1, y: 1 },
+            duration: 800,
+          })
+          .then(() => {
+            if (this.finished) {
+              this.circle
+                .animate({
+                  scale: { x: 30, y: 30 },
+                  duration: 400,
+                })
+                .then(() => {
+                  this.fadeOut();
+                });
+            } else {
+              // keep looping
+              this.startAnimation();
+            }
+          });
+      });
+  }
+
+  cleanup() {
+    this.finished = true;
+  }
+
+  fadeOut() {
+    this.animatedContainer
+      .animate({
+        opacity: 0,
+        duration: 400,
+      })
+      .then(() => {
+        this._removeView(this.animatedContainer);
+        this.animatedContainer = null;
+        this.circle = null;
+      });
+  }
+}
+
+platformNativeScriptDynamic({
+  launchView: new LaunchAnimation(),
+  // backgroundColor: 'purple'
+}).bootstrapModule(AppModule);