carousels-sliders（旋转木马滑块）

Carousel & Slider Animation Principles

Apply Disney's 12 principles to carousels and sliders for smooth, intuitive navigation.

Principles Applied to Carousels

1. Squash & Stretch

Slides can slightly compress in scroll direction during fast swipes. Expands perception of speed and momentum.

2. Anticipation

Before slide change, current slide can shift 5-10px in direction of navigation. Button can depress before triggering.

3. Staging

Current/active slide should be prominently displayed: larger, centered, more opaque. Adjacent slides can be dimmed or scaled down.

4. Straight Ahead & Pose to Pose

Use pose-to-pose: define exact positions for each slide. Snap points should be clear and predictable.

5. Follow Through & Overlapping Action

After snap, slide can overshoot slightly and settle back. Content within slide (text, buttons) lags behind container movement.

6. Ease In & Ease Out

Swipe release: ease-out (momentum slowdown). Button navigation: ease-in-out. cubic-bezier(0.25, 0.1, 0.25, 1) for smooth slides.

7. Arcs

3D carousels should rotate slides along curved paths. Coverflow effects follow arc naturally. Even flat carousels can have subtle Y movement.

8. Secondary Action

While slide moves (primary), pagination updates (secondary), adjacent slides scale/fade (tertiary), progress bar moves (quaternary).

9. Timing

• Slide transition: 300-500ms
• Swipe momentum: 200-400ms
• Pagination dot: 150ms
• Autoplay interval: 4000-6000ms
• Pause on hover: immediate
• Adjacent slide scale: 250ms

10. Exaggeration

Hero carousels can use more dramatic transitions. Product carousels should be smoother, less distracting. Scale to context.

11. Solid Drawing

Maintain consistent slide dimensions. Gaps should stay uniform. Aspect ratios must be preserved during any transforms.

12. Appeal

Smooth carousels feel premium. Janky sliders feel cheap. Touch response should feel native. Investment here pays dividends.

CSS Implementation

.carousel-track {
  display: flex;
  transition: transform 400ms cubic-bezier(0.25, 0.1, 0.25, 1);
}

.carousel-slide {
  flex-shrink: 0;
  transition: transform 300ms ease-out,
              opacity 300ms ease-out;
}

.carousel-slide:not(.active) {
  transform: scale(0.9);
  opacity: 0.6;
}

.pagination-dot {
  transition: transform 150ms ease-out,
              background-color 150ms ease-out;
}

.pagination-dot.active {
  transform: scale(1.3);
}

/* CSS scroll snap */
.carousel-container {
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
}

.carousel-slide {
  scroll-snap-align: center;
}

Key Properties

• transform: translateX, scale
• opacity: inactive slides
• scroll-snap-type: native snapping
• scroll-behavior: smooth scrolling
• transition: slide movements