Answer:1

apps/angular/1-projection/src/app/component/city-card/city-card.component.ts

@@ -1,9 +1,63 @@
-import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { NgOptimizedImage } from '@angular/common';
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { CityStore } from '../../data-access/city.store';
+import {
+  FakeHttpService,
+  randomCity,
+} from '../../data-access/fake-http.service';
+import {
+  CardAction,
+  CardActionType,
+  CardComponent,
+} from '../../ui/card/card.component';
+import { CardListItemTemplateDirective } from '../../ui/list-item/list-item-template.directive';
+import { ListItemComponent } from '../../ui/list-item/list-item.component';
 
 @Component({
   selector: 'app-city-card',
-  template: 'TODO City',
-  imports: [],
+  template: `
+    <app-card
+      [list]="cities()"
+      customClass="bg-light-green"
+      (actions)="cardActions($event)">
+      <img ngSrc="assets/img/city.png" width="200" height="200" alt="" />
+
+      <ng-template cardListItem let-item let-onDeleteAction="onDeleteAction">
+        <app-list-item
+          [name]="item.name"
+          [id]="item.id"
+          (deleteEvent)="onDeleteAction(item.id)" />
+      </ng-template>
+    </app-card>
+  `,
+  imports: [
+    CardComponent,
+    CardListItemTemplateDirective,
+    ListItemComponent,
+    NgOptimizedImage,
+  ],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class CityCardComponent {}
+export class CityCardComponent {
+  private http = inject(FakeHttpService);
+  private store = inject(CityStore);
+
+  cities = this.store.cities;
+
+  ngOnInit(): void {
+    this.http.fetchCities$.subscribe((s) => this.store.addAll(s));
+  }
+
+  cardActions(action: CardAction) {
+    switch (action.type) {
+      case CardActionType.ADD:
+        this.store.addOne(randomCity());
+        break;
+      case CardActionType.DELETE:
+        this.store.deleteOne(action.payload.id);
+        break;
+      default:
+        console.log('Unknown');
+    }
+  }
+}

apps/angular/1-projection/src/app/component/student-card/student-card.component.ts

@@ -1,40 +1,77 @@
+import { NgOptimizedImage } from '@angular/common';
 import {
   ChangeDetectionStrategy,
   Component,
   inject,
   OnInit,
+  ViewEncapsulation,
 } from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
+import {
+  FakeHttpService,
+  randStudent,
+} from '../../data-access/fake-http.service';
 import { StudentStore } from '../../data-access/student.store';
-import { CardType } from '../../model/card.model';
-import { CardComponent } from '../../ui/card/card.component';
+import {
+  CardAction,
+  CardActionType,
+  CardComponent,
+} from '../../ui/card/card.component';
+import { CardListItemTemplateDirective } from '../../ui/list-item/list-item-template.directive';
+import { ListItemComponent } from '../../ui/list-item/list-item.component';
 
 @Component({
   selector: 'app-student-card',
   template: `
     <app-card
       [list]="students()"
-      [type]="cardType"
-      customClass="bg-light-green" />
+      customClass="bg-light-green"
+      (actions)="cardActions($event)">
+      <img ngSrc="assets/img/student.webp" width="200" height="200" alt="" />
+
+      <ng-template cardListItem let-item let-onDeleteAction="onDeleteAction">
+        <app-list-item
+          [name]="item.firstName"
+          [id]="item.id"
+          (deleteEvent)="onDeleteAction(item.id)" />
+      </ng-template>
+    </app-card>
   `,
   styles: [
     `
-      ::ng-deep .bg-light-green {
+      .bg-light-green {
         background-color: rgba(0, 250, 0, 0.1);
       }
     `,
   ],
-  imports: [CardComponent],
+  encapsulation: ViewEncapsulation.None,
+  imports: [
+    CardComponent,
+    CardListItemTemplateDirective,
+    ListItemComponent,
+    NgOptimizedImage,
+  ],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class StudentCardComponent implements OnInit {
   private http = inject(FakeHttpService);
   private store = inject(StudentStore);
 
   students = this.store.students;
-  cardType = CardType.STUDENT;
 
   ngOnInit(): void {
     this.http.fetchStudents$.subscribe((s) => this.store.addAll(s));
   }
+
+  cardActions(action: CardAction) {
+    switch (action.type) {
+      case CardActionType.ADD:
+        this.store.addOne(randStudent());
+        break;
+      case CardActionType.DELETE:
+        this.store.deleteOne(action.payload.id);
+        break;
+      default:
+        console.log('Unknown');
+    }
+  }
 }

apps/angular/1-projection/src/app/component/teacher-card/teacher-card.component.ts

@@ -1,34 +1,70 @@
-import { Component, inject, OnInit } from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
+import { NgOptimizedImage } from '@angular/common';
+import { Component, inject, OnInit, ViewEncapsulation } from '@angular/core';
+import {
+  FakeHttpService,
+  randTeacher,
+} from '../../data-access/fake-http.service';
 import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
-import { CardComponent } from '../../ui/card/card.component';
+import {
+  CardAction,
+  CardActionType,
+  CardComponent,
+} from '../../ui/card/card.component';
+import { CardListItemTemplateDirective } from '../../ui/list-item/list-item-template.directive';
+import { ListItemComponent } from '../../ui/list-item/list-item.component';
 
 @Component({
   selector: 'app-teacher-card',
   template: `
     <app-card
       [list]="teachers()"
-      [type]="cardType"
-      customClass="bg-light-red"></app-card>
+      customClass="bg-light-red"
+      (actions)="cardActions($event)">
+      <img ngSrc="assets/img/teacher.png" width="200" height="200" alt="" />
+
+      <ng-template cardListItem let-item let-onDeleteAction="onDeleteAction">
+        <app-list-item
+          [name]="item.firstName"
+          [id]="item.id"
+          (deleteEvent)="onDeleteAction(item.id)" />
+      </ng-template>
+    </app-card>
   `,
   styles: [
     `
-      ::ng-deep .bg-light-red {
+      .bg-light-red {
         background-color: rgba(250, 0, 0, 0.1);
       }
     `,
   ],
-  imports: [CardComponent],
+  encapsulation: ViewEncapsulation.None,
+  imports: [
+    CardComponent,
+    CardListItemTemplateDirective,
+    ListItemComponent,
+    NgOptimizedImage,
+  ],
 })
 export class TeacherCardComponent implements OnInit {
   private http = inject(FakeHttpService);
   private store = inject(TeacherStore);
 
   teachers = this.store.teachers;
-  cardType = CardType.TEACHER;
 
   ngOnInit(): void {
     this.http.fetchTeachers$.subscribe((t) => this.store.addAll(t));
   }
+
+  cardActions(action: CardAction) {
+    switch (action.type) {
+      case CardActionType.ADD:
+        this.store.addOne(randTeacher());
+        break;
+      case CardActionType.DELETE:
+        this.store.deleteOne(action.payload.id);
+        break;
+      default:
+        console.log('Unhandled action: ' + action);
+    }
+  }
 }

apps/angular/1-projection/src/app/data-access/city.store.ts

@@ -5,7 +5,7 @@ import { City } from '../model/city.model';
   providedIn: 'root',
 })
 export class CityStore {
-  private cities = signal<City[]>([]);
+  public cities = signal<City[]>([]);
 
   addAll(cities: City[]) {
     this.cities.set(cities);

apps/angular/1-projection/src/app/ui/card/card.component.ts

@@ -1,30 +1,29 @@
-import { NgOptimizedImage } from '@angular/common';
-import { Component, inject, input } from '@angular/core';
-import { randStudent, randTeacher } from '../../data-access/fake-http.service';
-import { StudentStore } from '../../data-access/student.store';
-import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
-import { ListItemComponent } from '../list-item/list-item.component';
+import { NgTemplateOutlet } from '@angular/common';
+import { Component, contentChild, input, output } from '@angular/core';
+import { CardListItemTemplateDirective } from '../list-item/list-item-template.directive';
+
+export enum CardActionType {
+  ADD = 'add',
+  DELETE = 'delete',
+}
+
+export type CardAction =
+  | { type: CardActionType.ADD }
+  | { type: CardActionType.DELETE; payload: { id: number } };
 
 @Component({
   selector: 'app-card',
   template: `
     <div
       class="flex w-fit flex-col gap-3 rounded-md border-2 border-black p-4"
       [class]="customClass()">
-      @if (type() === CardType.TEACHER) {
-        <img ngSrc="assets/img/teacher.png" width="200" height="200" alt="" />
-      }
-      @if (type() === CardType.STUDENT) {
-        <img ngSrc="assets/img/student.webp" width="200" height="200" alt="" />
-      }
+      <ng-content />
 
       <section>
         @for (item of list(); track item) {
-          <app-list-item
-            [name]="item.firstName"
-            [id]="item.id"
-            [type]="type()"></app-list-item>
+          <ng-container
+            [ngTemplateOutlet]="listItemTemplate()?.template"
+            [ngTemplateOutletContext]="getItemContext(item)" />
         }
       </section>
 
@@ -35,24 +34,28 @@ import { ListItemComponent } from '../list-item/list-item.component';
       </button>
     </div>
   `,
-  imports: [ListItemComponent, NgOptimizedImage],
+  imports: [NgTemplateOutlet, CardListItemTemplateDirective],
 })
 export class CardComponent {
-  private teacherStore = inject(TeacherStore);
-  private studentStore = inject(StudentStore);
-
   readonly list = input<any[] | null>(null);
-  readonly type = input.required<CardType>();
   readonly customClass = input('');
 
-  CardType = CardType;
+  actions = output<CardAction>();
+
+  listItemTemplate = contentChild(CardListItemTemplateDirective);
+
+  getItemContext(item: any) {
+    return {
+      $implicit: item,
+      onDeleteAction: (id: number) => this.deleteItem(id),
+    };
+  }
 
   addNewItem() {
-    const type = this.type();
-    if (type === CardType.TEACHER) {
-      this.teacherStore.addOne(randTeacher());
-    } else if (type === CardType.STUDENT) {
-      this.studentStore.addOne(randStudent());
-    }
+    this.actions.emit({ type: CardActionType.ADD });
+  }
+
+  deleteItem(id: number) {
+    this.actions.emit({ type: CardActionType.DELETE, payload: { id } });
   }
 }

apps/angular/1-projection/src/app/ui/list-item/list-item-template.directive.ts

@@ -0,0 +1,12 @@
+import { Directive, inject, TemplateRef } from '@angular/core';
+
+@Directive({
+  selector: 'ng-template[cardListItem]',
+  exportAs: 'cardListItem',
+})
+export class CardListItemTemplateDirective {
+  template: TemplateRef<{
+    $implicit: any;
+    onDeleteAction: (id: number) => void;
+  }> = inject(TemplateRef);
+}

apps/angular/1-projection/src/app/ui/list-item/list-item.component.ts

@@ -1,12 +1,9 @@
 import {
   ChangeDetectionStrategy,
   Component,
-  inject,
   input,
+  output,
 } from '@angular/core';
-import { StudentStore } from '../../data-access/student.store';
-import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
 
 @Component({
   selector: 'app-list-item',
@@ -21,19 +18,12 @@ import { CardType } from '../../model/card.model';
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class ListItemComponent {
-  private teacherStore = inject(TeacherStore);
-  private studentStore = inject(StudentStore);
-
   readonly id = input.required<number>();
   readonly name = input.required<string>();
-  readonly type = input.required<CardType>();
+
+  deleteEvent = output<number>();
 
   delete(id: number) {
-    const type = this.type();
-    if (type === CardType.TEACHER) {
-      this.teacherStore.deleteOne(id);
-    } else if (type === CardType.STUDENT) {
-      this.studentStore.deleteOne(id);
-    }
+    this.deleteEvent.emit(id);
   }
 }