add fade to carousel

angular.json

@@ -38,8 +38,8 @@
                 },
                 {
                   "type": "anyComponentStyle",
-                  "maximumWarning": "4kB",
+                  "maximumWarning": "5kB",
-                  "maximumError": "8kB"
+                  "maximumError": "5kB"
                 }
               ],
               "outputHashing": "all"

src/components/tech-stack-carousel/tech-stack-carousel.css

@@ -28,6 +28,7 @@ h2 {
 
 .stack-carousel-shell {
   --carousel-nav-space: 4.25rem;
+  --carousel-edge-fade-size: clamp(1.25rem, 3vw, 2.75rem);
   position: relative;
   width: calc(100% + (var(--carousel-nav-space) * 2));
   margin-inline: calc(var(--carousel-nav-space) * -1);
@@ -35,8 +36,36 @@ h2 {
 }
 
 .stack-carousel-column {
+  position: relative;
+  --left-fade-size: 0px;
+  --right-fade-size: 0px;
   width: calc(100% - (var(--carousel-nav-space) * 2));
   margin-inline: auto;
+  overflow: hidden;
+  -webkit-mask-image: linear-gradient(
+    to right,
+    transparent 0,
+    #000 var(--left-fade-size),
+    #000 calc(100% - var(--right-fade-size)),
+    transparent 100%
+  );
+  mask-image: linear-gradient(
+    to right,
+    transparent 0,
+    #000 var(--left-fade-size),
+    #000 calc(100% - var(--right-fade-size)),
+    transparent 100%
+  );
+  -webkit-mask-repeat: no-repeat;
+  mask-repeat: no-repeat;
+}
+
+.stack-carousel-column.has-left-fade {
+  --left-fade-size: var(--carousel-edge-fade-size);
+}
+
+.stack-carousel-column.has-right-fade {
+  --right-fade-size: var(--carousel-edge-fade-size);
 }
 
 .stack-carousel {
@@ -180,6 +209,7 @@ h2 {
 @media (max-width: 760px) {
   .stack-carousel-shell {
     --carousel-nav-space: 0;
+    --carousel-edge-fade-size: 1rem;
     width: 100%;
     margin-inline: 0;
   }
@@ -199,7 +229,8 @@ h2 {
 
 @media (min-width: 1000px) {
   .stack-slide {
-    flex-basis: calc((100% - 2rem) / 3);
+    flex-basis: calc((100% - 3rem) / 4);
   }
 }
 
+

src/components/tech-stack-carousel/tech-stack-carousel.html

@@ -17,11 +17,12 @@
       <span aria-hidden="true">&larr;</span>
     </button>
 
-    <div class="stack-carousel-column">
+    <div class="stack-carousel-column" [class.has-left-fade]="showLeftFade" [class.has-right-fade]="showRightFade">
       <div
         class="stack-carousel"
         [class.is-auto-scrolling]="isAutoScrolling"
         #stackCarousel
+        (scroll)="onCarouselScroll()"
         role="region"
         aria-label="Tech stack carousel"
       >

src/components/tech-stack-carousel/tech-stack-carousel.ts

@@ -23,6 +23,8 @@ export class TechStackCarousel implements AfterViewInit, OnDestroy {
   private virtualScrollLeft = 0;
   private readonly autoScrollSpeedPxPerSecond = 72;
   isAutoScrolling = false;
+  showLeftFade = false;
+  showRightFade = false;
 
   readonly skills: Skill[] = [
     { name: 'Angular', category: 'Frontend', level: 'Advanced', logoUrl: '/tech-logos/angular.svg', fallbackLabel: 'NG' },
@@ -46,12 +48,14 @@ export class TechStackCarousel implements AfterViewInit, OnDestroy {
       typeof window.matchMedia === 'function' && window.matchMedia('(prefers-reduced-motion: reduce)').matches;
 
     if (prefersReducedMotion) {
+      this.updateFadeState();
       return;
     }
 
     // Defer start to the next task to avoid NG0100 in dev mode.
     this.startAutoScrollTimeout = setTimeout(() => {
       this.startAutoScrollTimeout = null;
+      this.updateFadeState();
       this.resumeAutoScroll();
     }, 0);
   }
@@ -73,6 +77,11 @@ export class TechStackCarousel implements AfterViewInit, OnDestroy {
     }
 
     carousel.scrollBy({ left: this.getScrollStep(carousel) * direction, behavior: 'smooth' });
+    requestAnimationFrame(() => this.updateFadeState(carousel));
+  }
+
+  onCarouselScroll(): void {
+    this.updateFadeState();
   }
 
   pauseAutoScroll(): void {
@@ -111,6 +120,7 @@ export class TechStackCarousel implements AfterViewInit, OnDestroy {
       this.lastAutoScrollTime = timestamp;
 
       this.autoAdvanceStack(carousel, deltaMs);
+      this.updateFadeState(carousel);
       this.autoScrollFrameId = requestAnimationFrame(step);
     };
 
@@ -150,6 +160,25 @@ export class TechStackCarousel implements AfterViewInit, OnDestroy {
     return carousel.scrollWidth / 2;
   }
 
+  private updateFadeState(carousel = this.stackCarousel?.nativeElement): void {
+    if (!carousel) {
+      this.showLeftFade = false;
+      this.showRightFade = false;
+      return;
+    }
+
+    const maxScroll = Math.max(carousel.scrollWidth - carousel.clientWidth, 0);
+    if (maxScroll <= 1) {
+      this.showLeftFade = false;
+      this.showRightFade = false;
+      return;
+    }
+
+    const left = carousel.scrollLeft;
+    this.showLeftFade = left > 1;
+    this.showRightFade = left < maxScroll - 1;
+  }
+
   private getScrollStep(carousel: HTMLElement): number {
     return Math.max(carousel.clientWidth * 0.82, 260);
   }