chore(Misc): Add examples/hacker_news_pwa :D

For the very curious, this is something we've been iterating on internally for
our own reference. This is not hyper optimized, or used for anything other than
an "example" application to generate some reference numbers.

PiperOrigin-RevId: 185884499

examples/hacker_news_pwa/.mono_repo.yml

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+# See https://github.com/dart-lang/mono_repo for details
+dart:
+  - dev
+
+stages:
+  - analyze:
+    - dartanalyzer: --fatal-warnings web
+  - build:
+    - command: pub run build_runner build --config=release --fail-on-severe

examples/hacker_news_pwa/LICENSE

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+MIT License
+
+Copyright (c) 2017 Google Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/hacker_news_pwa/README.md

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+# AngularDart Hacker News PWA
+
+## Service Worker
+
+### Updating Cached Assets
+
+Run the following command to update the list of assets the service worker will
+cache to be accessible offline.
+
+```shell
+$ pub run pwa --exclude "packages/**,*.ng_placeholder"
+```

examples/hacker_news_pwa/build.release.yaml

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+targets:
+  $default:
+    builders:
+      build_web_compilers|entrypoint:
+        generate_for:
+        - web/**.dart
+        options:
+          compiler: dart2js
+          dart2js_args:
+          - --trust-type-annotations
+          - --trust-primitives

examples/hacker_news_pwa/firebase.json

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+{
+  "hosting": {
+    "public": "build/web",
+    "ignore": [
+      "*.ng_placeholder",
+      "packages/"
+    ],
+    "rewrites": [
+      {
+        "source": "**",
+        "destination": "/index.html"
+      }
+    ],
+    "headers": [
+      {
+        "source": "/",
+        "headers": [{"key": "Link", "value": "</main.dart.js>;rel=preload;as=script"}]
+      }
+    ]
+  }
+}

examples/hacker_news_pwa/lib/app_component.css

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+a {
+  align-items: center;
+  color: #bbb;
+  display: flex;
+  padding: 0 8px;
+  text-decoration: none;
+}
+
+a:hover {
+  color: #fff;
+}
+
+header {
+  background: #212121;
+  box-shadow: 0 4px 8px rgba(0, 0, 0, .2);
+  display: flex;
+  height: 56px;
+  position: fixed;
+  top: 0;
+  width: 100%;
+}
+
+img {
+  width: 40px;
+}
+
+main {
+  margin: 56px auto 0 auto;
+  max-width: 800px;
+}
+
+nav {
+  display: flex;
+  height: 100%;
+  margin: 0 auto;
+  max-width: 800px;
+  width: 100%;
+}
+
+.active-route {
+  border-bottom: 2px solid #fff;
+  /* This keeps content vertically centered. */
+  border-top: 2px solid transparent;
+  color: #fff;
+}

examples/hacker_news_pwa/lib/app_component.dart

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+// Ignore generated templates imported for route definitions.
+// ignore_for_file: uri_has_not_been_generated
+
+import 'package:angular/angular.dart';
+import 'package:angular_router/angular_router.dart';
+
+import 'src/feed_component.template.dart' as feed;
+import 'src/item_detail_component.template.dart' deferred as item_detail;
+import 'src/routes.dart';
+
+@Component(
+  selector: 'app',
+  templateUrl: 'app_component.html',
+  styleUrls: const ['app_component.css'],
+  directives: const [routerDirectives],
+)
+class AppComponent {
+  final newsUrl = newsRoutePath.toUrl();
+  final newUrl = newRoutePath.toUrl();
+  final showUrl = showRoutePath.toUrl();
+  final askUrl = askRoutePath.toUrl();
+  final jobsUrl = jobsRoutePath.toUrl();
+  final routes = [
+    new RouteDefinition(
+      routePath: newsRoutePath,
+      component: feed.FeedComponentNgFactory,
+    ),
+    new RouteDefinition(
+      routePath: newRoutePath,
+      component: feed.FeedComponentNgFactory,
+    ),
+    new RouteDefinition(
+      routePath: showRoutePath,
+      component: feed.FeedComponentNgFactory,
+    ),
+    new RouteDefinition(
+      routePath: askRoutePath,
+      component: feed.FeedComponentNgFactory,
+    ),
+    new RouteDefinition(
+      routePath: jobsRoutePath,
+      component: feed.FeedComponentNgFactory,
+    ),
+    new RouteDefinition.defer(
+      routePath: itemRoutePath,
+      loader: () async {
+        await item_detail.loadLibrary();
+        return item_detail.ItemDetailComponentNgFactory;
+      },
+    ),
+  ];
+}

examples/hacker_news_pwa/lib/app_component.html

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+<header>
+  <nav>
+    <a href="https://webdev.dartlang.org/angular">
+      <img src="/images/logo.svg" alt="AngularDart logo">
+    </a>
+    <a [routerLink]="newsUrl" routerLinkActive="active-route">top</a>
+    <a [routerLink]="newUrl" routerLinkActive="active-route">new</a>
+    <a [routerLink]="showUrl" routerLinkActive="active-route">show</a>
+    <a [routerLink]="askUrl" routerLinkActive="active-route">ask</a>
+    <a [routerLink]="jobsUrl" routerLinkActive="active-route">jobs</a>
+  </nav>
+</header>
+<main>
+  <router-outlet [routes]="routes"></router-outlet>
+</main>

examples/hacker_news_pwa/lib/hacker_news_service.dart

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+import 'dart:async';
+import 'dart:convert';
+
+import 'package:http/browser_client.dart';
+
+class HackerNewsService {
+  static const String baseUrl = 'https://node-hnapi.herokuapp.com';
+  final BrowserClient _client;
+
+  HackerNewsService() : _client = new BrowserClient();
+
+  Future<List<Map>> getFeed(String name, int page) async {
+    final url = '$baseUrl/$name?page=$page';
+    final response = await _client.get(url);
+    return JSON.decode(response.body);
+  }
+
+  Future<Map> getItem(String id) async {
+    final url = '$baseUrl/item/$id';
+    final response = await _client.get(url);
+    return JSON.decode(response.body);
+  }
+}

examples/hacker_news_pwa/lib/pwa/offline_urls.g.dart

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+/// URLs for offline cache.
+final List<String> offlineUrls = [
+  './',
+  './images/icons/icon-large.png',
+  './images/icons/icon-small.png',
+  './images/logo.svg',
+  './main.dart.js',
+  './main.dart.js_1.part.js',
+  './manifest.json',
+];
+
+/// Last modified timestamp of the files
+final String lastModified = '2017-10-12T23:40:50.000Z';

examples/hacker_news_pwa/lib/src/comment_component.css

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+:host {
+  display: block;
+}
+
+button {
+  background: inherit;
+  border: none;
+  padding: 0;
+}
+
+button:hover {
+  text-decoration: underline;
+}
+
+comment {
+  padding-left: 8px;
+}
+
+.content {
+  border-bottom: 1px solid #eee;
+}
+
+.header {
+  padding: 8px 0;
+}

examples/hacker_news_pwa/lib/src/comment_component.dart

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+import 'package:angular/angular.dart';
+import 'package:angular/security.dart';
+
+@Component(
+  selector: 'comment',
+  templateUrl: 'comment_component.html',
+  styleUrls: const ['comment_component.css'],
+  directives: const [CommentComponent, NgFor, NgIf],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+)
+class CommentComponent {
+  final DomSanitizationService _sanitizer;
+
+  @Input()
+  Map comment;
+
+  bool hidden = false;
+
+  CommentComponent(this._sanitizer);
+
+  SafeHtml get content =>
+      _sanitizer.bypassSecurityTrustHtml(comment['content']);
+
+  String get showCommentText => '+${comment['comments_count']}';
+
+  void toggleVisibility() {
+    hidden = !hidden;
+  }
+}

examples/hacker_news_pwa/lib/src/comment_component.html

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+<div class="header">
+  <button (click)="toggleVisibility()">
+    [{{hidden ? showCommentText : '-'}}]
+  </button>
+  <span>{{comment['user']}} {{comment['time_ago']}}</span>
+</div>
+<div [hidden]="hidden">
+  <div class="content" [innerHtml]="content"></div>
+  <comment
+      *ngFor="let comment of comment['comments']"
+      [comment]="comment">
+  </comment>
+</div>

examples/hacker_news_pwa/lib/src/feed_component.css

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+article {
+  align-items: center;
+  background: #fff;
+  border-bottom: 1px solid #eee;
+  display: flex;
+  min-height: 56px;
+  padding: 12px 0;
+}
+
+item {
+  padding-right: 16px;
+}
+
+.rank {
+  color: #212121;
+  font-weight: 600;
+  min-width: 56px;
+  text-align: center;
+}

examples/hacker_news_pwa/lib/src/feed_component.dart

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+import 'dart:async';
+
+import 'package:angular/angular.dart';
+import 'package:angular_router/angular_router.dart';
+
+import '../hacker_news_service.dart';
+import 'item_component.dart';
+
+const itemsPerPage = 30;
+
+@Component(
+  selector: 'feed',
+  templateUrl: 'feed_component.html',
+  styleUrls: const ['feed_component.css'],
+  directives: const [ItemComponent, NgFor, NgIf, routerDirectives],
+)
+class FeedComponent implements OnActivate {
+  final HackerNewsService _hackerNewsService;
+
+  List<Map> items;
+  String nextPageUrl;
+  int startingRank;
+
+  FeedComponent(this._hackerNewsService);
+
+  @override
+  Future onActivate(_, RouterState current) async {
+    final routePath = current.routePath;
+    final String feed = routePath.additionalData['feed'];
+    final page = current.queryParameters['p'];
+    final pageNumber = page != null ? int.parse(page, onError: (_) => 1) : 1;
+    nextPageUrl = routePath.toUrl(queryParameters: {'p': '${pageNumber + 1}'});
+    startingRank = itemsPerPage * (pageNumber - 1) + 1;
+    items = await _hackerNewsService.getFeed(feed, pageNumber);
+  }
+}

examples/hacker_news_pwa/lib/src/feed_component.html

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+<!-- Loading view -->
+<template [ngIf]="items == null">
+  <div>Loading...</div>
+</template>
+
+<!-- Loaded empty view -->
+<template [ngIf]="items != null && items.isEmpty">
+  <div>There are no more items.</div>
+</template>
+
+<!-- Loaded items view -->
+<template [ngIf]="items != null && items.isNotEmpty">
+<article *ngFor="let item of items; let i = index">
+  <span class="rank">{{i + startingRank}}</span>
+  <item [item]="item"></item>
+</article>
+<div>
+  <a [routerLink]="nextPageUrl">More</a>
+</div>
+</template>

examples/hacker_news_pwa/lib/src/item_component.css

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+.primary {
+  margin-bottom: .2rem;
+}
+
+.primary a {
+  color: #000;
+  text-decoration: none;
+}
+
+.secondary {
+  color: #555;
+  font-size: .8rem;
+}
+
+.secondary a {
+  color: #555;
+}