애니메이션

const springy: LayoutAnimation = ({ element, from, to, reducedMotion }) => {
  if (reducedMotion) return;
  return element.animate(
    [{ translate: `${from.left - to.left}px ${from.top - to.top}px` }, { translate: '0 0' }],
    { duration: 500, easing: 'cubic-bezier(.34, 1.56, .64, 1)' },
  );
};

const animation = shallowRef<LayoutAnimation>(true); // true, { duration: 600 }, springy or false
const dropAnimation = shallowRef<DropAnimation>(true); // true, { duration: 700 }, toss or false

const { items } = makeSortableList(table, {
  items: cards,
  strategy: 'horizontal',
  dropOutside: 'cancel', // let go off the table: the card flies back
  animation,
  dropAnimation,
});

/** The overlay arcs to its slot, as if tossed. */
const toss: DropAnimation = ({ overlay, from, to, reducedMotion }) => {
  if (reducedMotion) return;
  // No visible slot to land on: fade out where it is.
  if (!to) return overlay.animate([{ opacity: 1 }, { opacity: 0 }], { duration: 200, fill: 'forwards' });
  const place = (x: number, y: number) => `translate3d(${x}px, ${y}px, 0)`;
  const rise = Math.min(120, Math.hypot(to.left - from.left, to.top - from.top) / 2);
  return overlay.animate(
    [
      { transform: place(from.left, from.top), width: `${from.width}px`, height: `${from.height}px` },
      { transform: place((from.left + to.left) / 2, Math.min(from.top, to.top) - rise), offset: 0.45 },
      { transform: place(to.left, to.top), width: `${to.width}px`, height: `${to.height}px` },
    ],
    { duration: 550, easing: 'ease-in-out', fill: 'forwards' },
  );
};

// 3. The list's, for its items without one of their own.
makeSortableList(shelf, {
  items: products,
  strategy: 'horizontal',
  dropAnimation: { duration: 450, easing: 'cubic-bezier(.34, 1.56, .64, 1)' },
});

// 2. The item's own: it wins over its list's.
makeSortableItem(el, {
  item: () => props.product,
  dropAnimation: props.product.fragile ? { duration: 1100, easing: 'ease-in-out' } : undefined,
});

// 1. The target's: it wins over both.
const intoCart: DropAnimation = ({ overlay, from, reducedMotion }) => {
  const end = icon.value?.getBoundingClientRect();
  if (!end || reducedMotion) return;
  // Into the icon, shrinking: the box scales around its top left corner.
  const scale = end.height / from.height;
  const animation = overlay.animate(
    [
      { transform: `translate3d(${from.left}px, ${from.top}px, 0)` },
      {
        transform: `translate3d(${end.left + (end.width - from.width * scale) / 2}px, ${end.top}px, 0) scale(${scale})`,
        opacity: 0,
      },
    ],
    { duration: 450, easing: 'cubic-bezier(.55, 0, .75, .2)', fill: 'forwards' },
  );
  animation.finished.then(() => landed.value++, () => {}); // the icon bounces
  return animation;
};

makeDroppable(el, { id: 'cart', overDropAnimation: intoCart, onDrop: … });

makeDroppable(el, {
  id: 'trash',
  // The overlay reads it as `over.data`: it aims the photo at the bin's mouth.
  data: () => ({ bin: bin.value }),
  overOverlay: Crumple,
  // The box stays where it was let go: its content does the landing.
  overDropAnimation: false,
  onDrop: (event) => emit('drop', event), // the gallery calls `event.source?.remove()`
});

// Its landing is over: the photo is in, the lid shuts.
useDnDMonitor({
  onDragSettle: (event) => {
    if ('dropped' in event && event.over?.id === 'trash') shut.value++;
  },
});

<template>
  <div class="crumple">
    <!-- `fall` is set at the drop: `--dx` and `--dy`, from the photo to the bin in `over.data`. -->
    <div class="paper" :class="{ falling: fall }" :style="fall">
      <slot />
    </div>
  </div>
</template>

<style scoped>
.paper { clip-path: polygon(…); rotate: -8deg; scale: 0.7; }
.paper.falling { animation: fall 0.55s forwards; }
@keyframes fall {
  to { translate: var(--dx) var(--dy); rotate: -120deg; scale: 0.12; opacity: 0; }
}
</style>

<template>
  <DnDProvider overlay-class="pipeline-hand">…</DnDProvider>
</template>

<!-- Not scoped: the overlay's content element is the library's, outside this component. -->
<style>
.pipeline-hand {
  transition:
    rotate 0.25s cubic-bezier(0.2, 0.8, 0.2, 1),
    scale 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-dnd-overlay='dragging'] > .pipeline-hand {
  rotate: 3deg;
  scale: 1.05;
}

/* Where the lift starts: the box appears already `dragging`. */
@starting-style {
  [data-dnd-overlay='dragging'] > .pipeline-hand {
    rotate: 0deg;
    scale: 1;
  }
}
</style>

<script setup lang="ts">
const { items, isOver, isAccepting } = makeSortableList(list, {
  id: props.lane.id,
  items: toRef(props.lane, 'people'),
  group: 'pipeline',
  dropzone: zone,
});
</script>

<template>
  <section ref="zone" class="lane" :class="{ ready: isAccepting, over: isOver }">
    <h3>
      {{ lane.title }}
      <!-- A new element for every count: its animation plays on each change. -->
      <span :key="items.length" class="count">{{ items.length }}</span>
    </h3>
    <ul ref="list">…</ul>
  </section>
</template>

<style scoped>
.lane { transition: background-color 0.25s, box-shadow 0.25s; }
.lane.ready { box-shadow: inset 0 0 0 1px color-mix(in srgb, #42b883 35%, transparent); }
.lane.over { background: color-mix(in srgb, #42b883 8%, transparent); box-shadow: inset 0 0 0 1.5px #42b883; }
.count { animation: bump 0.3s ease-out; }
</style>

/* The slot opens where it appears, then breathes until the card lands. */
.candidate[data-dnd-placeholder] {
  animation: open 0.2s ease-out, breathe 1.2s ease-in-out 0.2s infinite;
}

<script setup lang="ts">
import { animate } from 'motion-v';
import { DnDProvider, type DropAnimationContext, type LayoutAnimationContext } from '@vue-dnd-kit/core';

const spring = { type: 'spring', duration: 0.5, bounce: 0.3 } as const;

const move = ({ element, from, to, signal, reducedMotion }: LayoutAnimationContext) => {
  if (reducedMotion) return;
  const controls = animate(element, { translate: [`${from.left - to.left}px ${from.top - to.top}px`, '0px 0px'] }, spring);
  signal.addEventListener('abort', () => {
    controls.stop();
    element.style.translate = '';
  });
  return controls.finished;
};

const drop = ({ overlay, from, to, reducedMotion }: DropAnimationContext) => {
  if (reducedMotion) return;
  if (!to) return animate(overlay, { opacity: 0 }, { duration: 0.18 }).finished;
  return animate(
    overlay,
    { x: [from.left, to.left], y: [from.top, to.top], width: [from.width, to.width], height: [from.height, to.height] },
    spring,
  ).finished;
};
</script>

<template>
  <DnDProvider :animation="move" :drop-animation="drop">
    <Garland />
  </DnDProvider>
</template>

<script setup lang="ts">
import { motion, useMotionValue, useReducedMotion, useSpring, useTransform, useVelocity } from 'motion-v';
import { useDnD, type DnDStatus, type DragItem } from '@vue-dnd-kit/core';

const props = defineProps<{ items: DragItem[]; status: DnDStatus }>();

const { pointer } = useDnD();
const x = useMotionValue(pointer.value?.x ?? 0);
watch(() => pointer.value?.x, (value) => value !== undefined && x.set(value));
const swing = useSpring(useTransform(useVelocity(x), [-1500, 0, 1500], [-25, 0, 25]), { stiffness: 300, damping: 14 });
const calm = useReducedMotion();
</script>

<template>
  <!-- Held by its top edge: `transform-origin: 50% 0` in its CSS. -->
  <motion.div
    class="flag-overlay"
    :style="{ rotate: calm ? 0 : swing }"
    :animate="{ scale: status === 'dropping' || calm ? 1 : 1.1 }"
  >
    …
  </motion.div>
</template>

import gsap from 'gsap';
import type {
  DropAnimationContext,
  EnterAnimationContext,
  LayoutAnimationContext,
  LeaveAnimationContext,
  Rect,
} from '@vue-dnd-kit/core';

const move = ({ element, from, to, signal, reducedMotion }: LayoutAnimationContext) => {
  if (reducedMotion) return;
  const tween = gsap.fromTo(
    element,
    { translate: `${from.left - to.left}px ${from.top - to.top}px` },
    { translate: '0px 0px', duration: 0.4, ease: 'power3.out' },
  );
  signal.addEventListener('abort', () => tween.revert());
  return tween.then();
};

const box = (rect: Rect) => ({ x: rect.left, y: rect.top, width: rect.width, height: rect.height });

const drop = ({ overlay, from, to, reducedMotion }: DropAnimationContext) => {
  if (reducedMotion) return;
  if (!to) return gsap.to(overlay, { opacity: 0, duration: 0.2 }).then();
  return gsap.fromTo(overlay, box(from), { ...box(to), duration: 0.45, ease: 'back.out(1.2)' }).then();
};

const enter = ({ element, reducedMotion }: EnterAnimationContext) =>
  gsap.from(element, reducedMotion ? { opacity: 0, duration: 0.2 } : { opacity: 0, scale: 0.85, duration: 0.35 }).then();

const leave = ({ element, reducedMotion }: LeaveAnimationContext) =>
  gsap.to(element, reducedMotion ? { opacity: 0, duration: 0.2 } : { opacity: 0, scale: 0.85, duration: 0.25 }).then();

export const gsapAnimations = { animation: move, dropAnimation: drop, animateChanges: { move, enter, leave } };