fix: children element scale error

packages/core/src/composables/use-hero.ts

@@ -2,8 +2,9 @@
 import { tryOnBeforeUnmount, tryOnMounted, useElementBounding } from '@vueuse/core'
 import { useElementTransform, useMotion } from '@vueuse/motion'
 import { defu } from 'defu'
-import { computed, type MaybeRef, unref } from 'vue'
+import { computed, type MaybeRef, unref, watch } from 'vue'
 import { type HeroContext, useHeroContext } from '../composables/use-hero-context'
+import { useStyle } from './use-style'
 
 export interface UseHeroProps extends Omit<HeroProps, 'as' | 'ignore'> {
   ignore?: string[]
@@ -35,6 +36,10 @@
   const { layouts, props: ctxProps } = ctx ?? useHeroContext()
   const { height, width, x, y, update } = useElementBounding(target)
   const props = computed(() => unref(options))
+  const { transform } = useStyle(target)
+
+  const scaleX = computed(() => transform.value.scaleX)
+  const scaleY = computed(() => transform.value.scaleY)
 
   const style = computed(() => ({ borderRadius: useBorderRadius(target), ...props.value?.style ?? {} }))
 
@@ -53,6 +58,18 @@
     },
   })
 
+  watch(() => [scaleX.value, scaleY.value], ([x, y]) => {
+    const elt = unref(target)
+
+    if (!elt)
+      return
+
+    for (let i = 0; i < elt.children.length; i++) {
+      const child = elt.children[i] as HTMLElement
+      child.style.transform = `scaleX(${1 / scaleX.value}) scaleY(${1 / scaleY.value})`
+    }
+  })
+
   tryOnMounted(setup)
   tryOnBeforeUnmount(clean)
 
@@ -110,6 +127,8 @@
     bounding,
     x,
     y,
+    scaleX,
+    scaleY,
     setup,
     clean,
   }

packages/core/src/composables/use-style.ts

@@ -0,0 +1,49 @@
+import { tryOnMounted, tryOnUnmounted } from '@vueuse/core'
+import { type MaybeRef, ref, unref } from 'vue'
+
+function parseTransform(value: string) {
+  const translate3dMatch = /translate3d\(([^)]+)\)/.exec(value)
+  const scaleXMatch = /scaleX\(([\d.]+)\)/.exec(value)
+  const scaleYMatch = /scaleY\(([\d.]+)\)/.exec(value)
+
+  const [x, y, z] = translate3dMatch
+    ? translate3dMatch[1].split(',').map(val => Number.parseFloat(val))
+    : [0, 0, 0]
+
+  return {
+    translateX: x,
+    translateY: y,
+    translateZ: z,
+    scaleX: scaleXMatch ? Number.parseFloat(scaleXMatch[1]) : 1,
+    scaleY: scaleYMatch ? Number.parseFloat(scaleYMatch[1]) : 1,
+  }
+}
+
+export function useStyle(target: MaybeRef<HTMLElement | SVGElement | undefined>) {
+  let observer: MutationObserver
+
+  const transform = ref<Record<string, number>>({})
+
+  tryOnMounted(() => {
+    observer = new MutationObserver((mutations) => {
+      mutations.forEach(({ target }) => {
+        transform.value = parseTransform((target as any).style.transform ?? '')
+      })
+    })
+
+    const elt = unref(target)
+
+    if (!elt)
+      return
+
+    observer.observe(elt, { attributes: true, attributeFilter: ['style'] })
+  })
+
+  tryOnUnmounted(() => {
+    observer?.disconnect()
+  })
+
+  return {
+    transform,
+  }
+}

playgrounds/vite/src/App.vue

@@ -1,5 +1,5 @@
 <script setup>
-import { directive, HeroProvider } from 'hero-motion'
+import { directive, Hero, HeroProvider } from 'hero-motion'
 import { ref } from 'vue'
 import { Tab, Tabs } from './components/Tabs'
 
@@ -65,13 +65,17 @@ function toggleSize() {
         </div>
 
         <div class="p-4 bg-gradient-to-r from-violet-500 to-fuchsia-500 rounded-xl">
-          <div class="grid place-items-center h-48 w-48">
+          <div class="grid place-items-center h-52 w-52">
             <button class="inline-flex justify-center rounded-md border border-transparent bg-violet-100 px-4 py-2 text-sm font-medium text-blue-900 hover:bg-violet-200" @click="toggleSize">
               Toggle (loading: {{ !hasCompleted }})
             </button>
 
-            <div v-if="isLarge" v-hero as="div" layout-id="box" class="w-24 h-24 rounded-xl cursor-pointer" :style="{ background: '#f43f5e' }" @complete="onComplete" />
-            <div v-else v-hero as="div" layout-id="box" class="w-12 h-12 rounded-xl cursor-pointer" :style="{ background: '#2dd4bf' }" @complete="onComplete" />
+            <Hero v-if="isLarge" v-hero as="div" layout-id="box" class="w-36 h-36 rounded-xl flex items-center justify-center" :style="{ background: '#f43f5e' }" @complete="onComplete">
+              <div>text content</div>
+            </Hero>
+            <Hero v-else v-hero as="div" layout-id="box" class="w-24 h-24 rounded-xl flex items-center justify-center" :style="{ background: '#2dd4bf' }" @complete="onComplete">
+              <div>text content</div>
+            </Hero>
           </div>
         </div>
       </div>

playgrounds/vite/src/components/Avatar.vue

@@ -9,7 +9,5 @@ defineProps<{
 </script>
 
 <template>
-  <Hero :layout-id="`avatar:${id}`" :style="{ width: `${size}px`, height: `${size}px` }" class="text-white rounded-lg flex items-center justify-center uppercase overflow-hidden">
-    <img :src="src">
-  </Hero>
+  <Hero as="img" :src="src" :layout-id="`avatar:${id}`" :style="{ width: `${size}px`, height: `${size}px` }" class="text-white rounded-lg flex items-center justify-center uppercase overflow-hidden" />
 </template>