feat(vue): allow useAutoAnimate with Vue component ref

[marshallswain]

This adds support for using useAutoAnimate with a component as the parent.

When you add ref="parent" to a component, the element is found at parent.value.$el. This update checks for component elements or a plain HTML element ref.

Without this change, you have to create a proxy ref to extract the element in the onMounted hook, like this:

<script setup lang="ts">
const [autoAnimateParent, enable] = useAutoAnimate()

// create a "proxy" dragParent ref which will hold a ref to the component.
const dragParent = ref()

// assign the component's $el to the autoAnimateParent once the DOM mounts
onMounted(() => (autoAnimateParent.value = dragParent.value?.$el))
</script>

<template>
  <VueDraggable
    ref="dragParent"
    v-model="items"
    :animation="300"
  >
    <!-- ... -->
  </VueDraggable>
</template>

This PR doesn't address the types. I'm not sure the best way to handle that. I did pull the code into a local repo to try it out and took this screenshot of the type issue.

If you want to instruct me how to proceed on the types, I'll update the code. Or feel free to edit this PR directly.

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Name	Status	Preview	Comments	Updated (UTC)
auto-animate	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 20, 2023 3:47am

[marshallswain]

I just noticed this other PR. #159

I think their objective is the same, based on this comment: #159 (comment).

[marshallswain]

Sorry about being lazy with the types. I'm not a TS ninja by any means, but I took a crack at it. Maybe you'll see a more optimal way to handle the ElementOrComponentRef type:

import { onMounted, ref, watchEffect } from 'vue'
import type { Directive, Plugin, Ref } from 'vue'
import type {
  AnimationController,
  AutoAnimateOptions,
  AutoAnimationPlugin,
} from '@formkit/auto-animate'
import autoAnimate, { vAutoAnimate as autoAnimateDirective,
} from '@formkit/auto-animate'

export const vAutoAnimate: Directive<
  HTMLElement,
  Partial<AutoAnimateOptions>
> = autoAnimateDirective

export const autoAnimatePlugin: Plugin = {
  install(app) {
    app.directive('auto-animate', vAutoAnimate)
  },
}

export type ElementOrComponentRef<T extends Element> = T & { $el?: Element }

/**
 * AutoAnimate hook for adding dead-simple transitions and animations to Vue.
 * @param options - Auto animate options or a plugin
 * @returns A template ref. Use the `ref` attribute of your parent element
 * to store the element in this template ref.
 */
export function useAutoAnimate<T extends Element>(
  options?: Partial<AutoAnimateOptions> | AutoAnimationPlugin,
): [Ref<ElementOrComponentRef<T>>, (enabled: boolean) => void] {
  const element = ref<ElementOrComponentRef<T>>()
  let controller: AnimationController | undefined
  function setEnabled(enabled: boolean) {
    if (controller)
      enabled ? controller.enable() : controller.disable()
  }
  onMounted(() => {
    watchEffect(() => {
      const el = element.value?.$el || element.value
      if (el instanceof HTMLElement)
        controller = autoAnimate(el, options || {})
    })
  })

  return [element as Ref<T>, setEnabled]
}