Create carousel component for testimonials (#2394)

* Create carousel component for testimonials

* Update changelog

---------

Co-authored-by: Thomas <4159106+dtslvr@users.noreply.github.com>

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added support for notes in the activities import
 - Added the application version to the endpoint `GET api/v1/admin`
+- Introduced a carousel component for the testimonial section on the landing page
 
 ### Fixed
 

apps/client/src/app/pages/landing/landing-page.html

@@ -320,32 +320,37 @@
 
   <div class="row my-5">
     <div class="col-12">
-      <h2 class="h4 mb-1 text-center" i18n>
+      <h2 class="h4 mb-3 text-center" i18n>
         What our <strong>users</strong> are saying
       </h2>
     </div>
-    <div *ngFor="let testimonial of testimonials" class="col-md-6">
-      <div class="d-flex flex-row py-3">
-        <div class="d-flex justify-content-center">
+    <div class="col-md-8 offset-md-2">
+      <gf-carousel [aria-label]="'Testimonials'">
+        <div *ngFor="let testimonial of testimonials" gf-carousel-item>
+          <div class="d-flex px-3">
             <gf-logo
               class="mr-3 mt-2 pt-1"
               size="medium"
               [showLabel]="false"
             ></gf-logo>
-        </div>
             <div>
               <div>{{ testimonial.quote }}</div>
               <div class="mt-2 text-muted">
                 —
-            <a *ngIf="testimonial.url" target="_blank" [href]="testimonial.url"
+                <a
+                  *ngIf="testimonial.url"
+                  target="_blank"
+                  [href]="testimonial.url"
                   >{{ testimonial.author }}</a
                 >
-            <span *ngIf="!testimonial.url">{{ testimonial.author }}</span>, {{
-            testimonial.country }}
+                <span *ngIf="!testimonial.url">{{ testimonial.author }}</span>,
+                {{ testimonial.country }}
               </div>
             </div>
           </div>
         </div>
+      </gf-carousel>
+    </div>
   </div>
 
   <div *ngIf="hasPermissionForSubscription" class="row my-5">

apps/client/src/app/pages/landing/landing-page.module.ts

@@ -4,6 +4,7 @@ import { MatButtonModule } from '@angular/material/button';
 import { MatCardModule } from '@angular/material/card';
 import { RouterModule } from '@angular/router';
 import { GfWorldMapChartModule } from '@ghostfolio/client/components/world-map-chart/world-map-chart.module';
+import { GfCarouselModule } from '@ghostfolio/ui/carousel';
 import { GfLogoModule } from '@ghostfolio/ui/logo';
 import { GfValueModule } from '@ghostfolio/ui/value';
 
@@ -14,6 +15,7 @@ import { LandingPageComponent } from './landing-page.component';
   declarations: [LandingPageComponent],
   imports: [
     CommonModule,
+    GfCarouselModule,
     GfLogoModule,
     GfValueModule,
     GfWorldMapChartModule,

libs/ui/src/lib/carousel/carousel-item.directive.ts

@@ -0,0 +1,16 @@
+import { FocusableOption } from '@angular/cdk/a11y';
+import { Directive, ElementRef, HostBinding } from '@angular/core';
+
+@Directive({
+  selector: '[gf-carousel-item]'
+})
+export class CarouselItem implements FocusableOption {
+  @HostBinding('attr.role') readonly role = 'listitem';
+  @HostBinding('tabindex') tabindex = '-1';
+
+  public constructor(readonly element: ElementRef<HTMLElement>) {}
+
+  public focus(): void {
+    this.element.nativeElement.focus({ preventScroll: true });
+  }
+}

libs/ui/src/lib/carousel/carousel.component.html

@@ -0,0 +1,34 @@
+<button
+  *ngIf="this.showPrevArrow"
+  aria-hidden="true"
+  aria-label="previous"
+  class="carousel-nav carousel-nav-prev no-min-width position-absolute"
+  mat-stroked-button
+  tabindex="-1"
+  (click)="previous()"
+>
+  <ion-icon name="chevron-back-outline"></ion-icon>
+</button>
+
+<div
+  #contentWrapper
+  class="overflow-hidden"
+  role="region"
+  (keyup)="onKeydown($event)"
+>
+  <div #list class="d-flex carousel-content" role="list" tabindex="0">
+    <ng-content></ng-content>
+  </div>
+</div>
+
+<button
+  *ngIf="this.showNextArrow"
+  aria-hidden="true"
+  aria-label="next"
+  class="carousel-nav carousel-nav-next no-min-width position-absolute"
+  mat-stroked-button
+  tabindex="-1"
+  (click)="next()"
+>
+  <ion-icon name="chevron-forward-outline"></ion-icon>
+</button>

libs/ui/src/lib/carousel/carousel.component.scss

@@ -0,0 +1,34 @@
+:host {
+  display: block;
+  position: relative;
+
+  ::ng-deep {
+    [gf-carousel-item] {
+      flex-shrink: 0;
+      width: 100%;
+    }
+  }
+
+  button {
+    top: 50%;
+    transform: translateY(-50%);
+
+    &.carousel-nav-prev {
+      left: -50px;
+    }
+
+    &.carousel-nav-next {
+      right: -50px;
+    }
+  }
+
+  .carousel-content {
+    flex-direction: row;
+    outline: none;
+    transition: transform 0.5s ease-in-out;
+
+    .animations-disabled & {
+      transition: none;
+    }
+  }
+}

libs/ui/src/lib/carousel/carousel.component.ts

@@ -0,0 +1,147 @@
+import { FocusKeyManager } from '@angular/cdk/a11y';
+import { LEFT_ARROW, RIGHT_ARROW, TAB } from '@angular/cdk/keycodes';
+import {
+  AfterContentInit,
+  ChangeDetectionStrategy,
+  Component,
+  ContentChildren,
+  ElementRef,
+  HostBinding,
+  Inject,
+  Input,
+  Optional,
+  QueryList,
+  ViewChild
+} from '@angular/core';
+import { ANIMATION_MODULE_TYPE } from '@angular/platform-browser/animations';
+
+import { CarouselItem } from './carousel-item.directive';
+
+@Component({
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  selector: 'gf-carousel',
+  styleUrls: ['./carousel.component.scss'],
+  templateUrl: './carousel.component.html'
+})
+export class CarouselComponent implements AfterContentInit {
+  @ContentChildren(CarouselItem) public items!: QueryList<CarouselItem>;
+
+  @HostBinding('class.animations-disabled')
+  public readonly animationsDisabled: boolean;
+
+  @Input('aria-label') public ariaLabel: string | undefined;
+
+  @ViewChild('list') public list!: ElementRef<HTMLElement>;
+
+  public showPrevArrow = false;
+  public showNextArrow = true;
+
+  private index = 0;
+  private keyManager!: FocusKeyManager<CarouselItem>;
+  private position = 0;
+
+  public constructor(
+    @Optional() @Inject(ANIMATION_MODULE_TYPE) animationsModule?: string
+  ) {
+    this.animationsDisabled = animationsModule === 'NoopAnimations';
+  }
+
+  public ngAfterContentInit() {
+    this.keyManager = new FocusKeyManager<CarouselItem>(this.items);
+  }
+
+  public next() {
+    for (let i = this.index; i < this.items.length; i++) {
+      if (this.isOutOfView(i)) {
+        this.index = i;
+        this.scrollToActiveItem();
+        break;
+      }
+    }
+  }
+
+  public onKeydown({ keyCode }: KeyboardEvent) {
+    const manager = this.keyManager;
+    const previousActiveIndex = manager.activeItemIndex;
+
+    if (keyCode === LEFT_ARROW) {
+      manager.setPreviousItemActive();
+    } else if (keyCode === RIGHT_ARROW) {
+      manager.setNextItemActive();
+    } else if (keyCode === TAB && !manager.activeItem) {
+      manager.setFirstItemActive();
+    }
+
+    if (
+      manager.activeItemIndex != null &&
+      manager.activeItemIndex !== previousActiveIndex
+    ) {
+      this.index = manager.activeItemIndex;
+      this.updateItemTabIndices();
+
+      if (this.isOutOfView(this.index)) {
+        this.scrollToActiveItem();
+      }
+    }
+  }
+
+  public previous() {
+    for (let i = this.index; i > -1; i--) {
+      if (this.isOutOfView(i)) {
+        this.index = i;
+        this.scrollToActiveItem();
+        break;
+      }
+    }
+  }
+
+  private isOutOfView(index: number, side?: 'start' | 'end') {
+    const { offsetWidth, offsetLeft } =
+      this.items.toArray()[index].element.nativeElement;
+
+    if ((!side || side === 'start') && offsetLeft - this.position < 0) {
+      return true;
+    }
+
+    return (
+      (!side || side === 'end') &&
+      offsetWidth + offsetLeft - this.position >
+        this.list.nativeElement.clientWidth
+    );
+  }
+
+  private scrollToActiveItem() {
+    if (!this.isOutOfView(this.index)) {
+      return;
+    }
+
+    const itemsArray = this.items.toArray();
+    let targetItemIndex = this.index;
+
+    if (this.index > 0 && !this.isOutOfView(this.index - 1)) {
+      targetItemIndex =
+        itemsArray.findIndex((_, i) => !this.isOutOfView(i)) + 1;
+    }
+
+    this.position =
+      itemsArray[targetItemIndex].element.nativeElement.offsetLeft;
+    this.list.nativeElement.style.transform = `translateX(-${this.position}px)`;
+    this.showPrevArrow = this.index > 0;
+    this.showNextArrow = false;
+
+    for (let i = itemsArray.length - 1; i > -1; i--) {
+      if (this.isOutOfView(i, 'end')) {
+        this.showNextArrow = true;
+        break;
+      }
+    }
+  }
+
+  private updateItemTabIndices() {
+    this.items.forEach((item: CarouselItem) => {
+      if (this.keyManager != null) {
+        item.tabindex = item === this.keyManager.activeItem ? '0' : '-1';
+      }
+    });
+  }
+}

libs/ui/src/lib/carousel/carousel.module.ts

@@ -0,0 +1,14 @@
+import { CommonModule } from '@angular/common';
+import { CUSTOM_ELEMENTS_SCHEMA, NgModule } from '@angular/core';
+import { MatButtonModule } from '@angular/material/button';
+
+import { CarouselItem } from './carousel-item.directive';
+import { CarouselComponent } from './carousel.component';
+
+@NgModule({
+  declarations: [CarouselComponent, CarouselItem],
+  exports: [CarouselComponent, CarouselItem],
+  imports: [CommonModule, MatButtonModule],
+  schemas: [CUSTOM_ELEMENTS_SCHEMA]
+})
+export class GfCarouselModule {}

libs/ui/src/lib/carousel/index.ts

@@ -0,0 +1 @@
+export * from './carousel.module';