examples: animation edge

examples/vite/src/Layouting/AnimationEdge.vue

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+<script setup lang="ts">
+import type { EdgeProps } from '@vue-flow/core'
+import { BaseEdge, EdgeLabelRenderer, getSmoothStepPath, useNodesData } from '@vue-flow/core'
+import { TransitionPresets, executeTransition } from '@vueuse/core'
+
+const props = defineProps<EdgeProps>()
+
+const edgePoint = ref(0)
+
+const sourceNodeData = useNodesData(() => props.source)
+
+const isFinished = toRef(() => sourceNodeData.value.isFinished)
+
+const isAnimating = ref(false)
+
+const edgeColor = toRef(() => {
+  if (sourceNodeData.value.hasError) {
+    return '#f87171'
+  }
+
+  if (sourceNodeData.value.isFinished) {
+    return '#10b981'
+  }
+
+  if (sourceNodeData.value.isCancelled) {
+    return '#fbbf24'
+  }
+
+  if (sourceNodeData.value.isSkipped) {
+    return '#f59e0b'
+  }
+
+  return '#6b7280'
+})
+
+const edgeRef = ref<InstanceType<typeof BaseEdge>>()
+
+const circlePosition = ref({ x: 0, y: 0 })
+
+const currentLength = ref(0)
+
+const path = computed(() => getSmoothStepPath(props))
+
+watch(edgePoint, (point) => {
+  const pathEl = edgeRef.value?.pathEl
+
+  if (!pathEl || point === 0) {
+    return
+  }
+
+  const currLength = pathEl.getTotalLength()
+
+  if (currentLength.value !== currLength) {
+    return runAnimation()
+  }
+
+  circlePosition.value = pathEl.getPointAtLength(point)
+})
+
+watch(isFinished, async (isFinished, _, onCleanup) => {
+  if (isFinished) {
+    await runAnimation()
+
+    edgePoint.value = 0
+    currentLength.value = 0
+    circlePosition.value = { x: 0, y: 0 }
+  }
+})
+
+async function runAnimation() {
+  const pathEl = edgeRef.value?.pathEl
+
+  if (!pathEl) {
+    return
+  }
+
+  isAnimating.value = true
+
+  const totalLength = pathEl.getTotalLength()
+
+  const from = edgePoint.value || 0
+
+  if (currentLength.value !== totalLength) {
+    currentLength.value = totalLength
+  }
+
+  await executeTransition(edgePoint, from, totalLength, {
+    transition: TransitionPresets.easeInOutCubic,
+  })
+
+  isAnimating.value = false
+}
+</script>
+
+<script lang="ts">
+export default {
+  name: 'AnimationEdge',
+  inheritAttrs: false,
+}
+</script>
+
+<template>
+  <BaseEdge v-bind="$attrs" :id="id" ref="edgeRef" :path="path[0]" :marker-end="markerEnd" :style="{ stroke: edgeColor }" />
+
+  <EdgeLabelRenderer v-if="isAnimating">
+    <div
+      :style="{
+        position: 'absolute',
+        transform: `translate(-50%, -50%) translate(${circlePosition.x}px,${circlePosition.y}px)`,
+        pointerEvents: 'all',
+      }"
+      class="nodrag nopan"
+    >
+      📦
+    </div>
+  </EdgeLabelRenderer>
+</template>