refactor(zoom): Move paneReady event to transformation pane mounted hook

* await dimensions in fitView function

src/composables/useZoomPanHelper.ts

@@ -1,5 +1,6 @@
 import { zoomIdentity } from 'd3-zoom'
 import useVueFlow from './useVueFlow'
+import useWindow from './useWindow'
 import { getRectOfNodes, pointToRendererPoint, getTransformForBounds } from '~/utils'
 import { GraphNode, FlowStore, UseZoomPanHelper, D3Selection } from '~/types'
 
@@ -21,13 +22,18 @@ export default (store: FlowStore = useVueFlow().store): UseZoomPanHelper => ({
     y: store.transform[1],
     zoom: store.transform[2],
   }),
-  fitView: (
+  fitView: async (
     options = {
       padding: DEFAULT_PADDING,
       includeHiddenNodes: false,
       duration: 0,
     },
   ) => {
+    // if ssr we can't wait for dimensions, they'll never really exist
+    const window = useWindow()
+    if ('screen' in window)
+      await until(store.dimensions).toMatch(({ height, width }) => !isNaN(width) && width > 0 && !isNaN(height) && height > 0)
+
     if (!store.getNodes.length) return
 
     let nodes: GraphNode[] = []

src/container/TransformationPane/TransformationPane.vue

@@ -1,11 +1,36 @@
 <script lang="ts" setup>
 import NodeRenderer from '../NodeRenderer/NodeRenderer.vue'
 import EdgeRenderer from '../EdgeRenderer/EdgeRenderer.vue'
-import { useVueFlow } from '../../composables'
+import { useVueFlow, useZoomPanHelper } from '../../composables'
+import { FlowInstance } from '../../types'
+import { onLoadGetEdges, onLoadGetElements, onLoadGetNodes, onLoadProject, onLoadToObject } from '../../utils'
 
 const { id, store } = useVueFlow()
 
 const transform = computed(() => `translate(${store.transform[0]}px,${store.transform[1]}px) scale(${store.transform[2]})`)
+
+onMounted(async () => {
+  const { zoomIn, zoomOut, zoomTo, setTransform, getTransform, fitView, fitBounds, setCenter } = useZoomPanHelper(store)
+  const instance: FlowInstance = {
+    fitView: (params = { padding: 0.1 }) => fitView(params),
+    zoomIn,
+    zoomOut,
+    zoomTo,
+    setTransform,
+    getTransform,
+    setCenter,
+    fitBounds,
+    project: onLoadProject(store),
+    getElements: onLoadGetElements(store),
+    getNodes: onLoadGetNodes(store),
+    getEdges: onLoadGetEdges(store),
+    toObject: onLoadToObject(store),
+  }
+  store.instance = instance
+  store.fitViewOnInit && instance.fitView()
+  store.paneReady = true
+  store.hooks.paneReady.trigger(instance)
+})
 </script>
 <template>
   <div :key="`transformation-pane-${id}`" class="vue-flow__transformation-pane vue-flow__container" :style="{ transform }">

src/container/VueFlow/VueFlow.vue

@@ -66,7 +66,7 @@ export default {
 </script>
 <template>
   <div class="vue-flow">
-    <ZoomPane :key="`renderer-${id}`" :fit-view-on-init="fitViewOnInit">
+    <ZoomPane :key="`renderer-${id}`">
       <template v-for="nodeName of Object.keys(getNodeTypes)" #[`node-${nodeName}`]="nodeProps" :key="`node-${nodeName}-${id}`">
         <slot :name="`node-${nodeName}`" v-bind="nodeProps" />
       </template>

src/container/ZoomPane/ZoomPane.vue

@@ -1,22 +1,12 @@
 <script lang="ts" setup>
 import { D3ZoomEvent, zoom, zoomIdentity, ZoomTransform } from 'd3-zoom'
 import { pointer, select } from 'd3-selection'
-import { FlowInstance, FlowTransform, PanOnScrollMode } from '../../types'
-import { useKeyPress, useWindow, useZoomPanHelper, useVueFlow } from '../../composables'
-import {
-  clamp,
-  clampPosition,
-  onLoadGetEdges,
-  onLoadGetElements,
-  onLoadGetNodes,
-  onLoadProject,
-  onLoadToObject,
-} from '../../utils'
+import { FlowTransform, PanOnScrollMode } from '../../types'
+import { useKeyPress, useVueFlow } from '../../composables'
+import { clamp, clampPosition } from '../../utils'
 import SelectionPane from '../SelectionPane/SelectionPane.vue'
 import TransformationPane from '../TransformationPane/TransformationPane.vue'
 
-const props = defineProps<{ fitViewOnInit?: boolean }>()
-
 const { id, store } = useVueFlow()
 const zoomPaneEl = templateRef<HTMLDivElement>('zoomPane', null)
 
@@ -55,22 +45,6 @@ onMounted(async () => {
   store.d3ZoomHandler = d3ZoomHandler
   store.transform = [updatedTransform.x, updatedTransform.y, updatedTransform.k]
 
-  d3z.on('start', (event: D3ZoomEvent<HTMLDivElement, any>) => {
-    if (viewChanged(transform.value, event.transform)) {
-      const flowTransform = eventToFlowTransform(event.transform)
-      transform.value = flowTransform
-      store.hooks.moveStart.trigger(flowTransform)
-    }
-  })
-
-  d3z.on('end', (event: D3ZoomEvent<HTMLDivElement, any>) => {
-    if (viewChanged(transform.value, event.transform)) {
-      const flowTransform = eventToFlowTransform(event.transform)
-      transform.value = flowTransform
-      store.hooks.moveEnd.trigger(flowTransform)
-    }
-  })
-
   const selectionKeyPressed = useKeyPress(store.selectionKeyCode, (keyPress) => {
     if (keyPress) {
       d3z.on('zoom', null)
@@ -87,6 +61,22 @@ onMounted(async () => {
 
   const zoomKeyPressed = store.zoomActivationKeyCode ? useKeyPress(store.zoomActivationKeyCode) : ref(true)
 
+  d3z.on('start', (event: D3ZoomEvent<HTMLDivElement, any>) => {
+    if (viewChanged(transform.value, event.transform)) {
+      const flowTransform = eventToFlowTransform(event.transform)
+      transform.value = flowTransform
+      store.hooks.moveStart.trigger(flowTransform)
+    }
+  })
+
+  d3z.on('end', (event: D3ZoomEvent<HTMLDivElement, any>) => {
+    if (viewChanged(transform.value, event.transform)) {
+      const flowTransform = eventToFlowTransform(event.transform)
+      transform.value = flowTransform
+      store.hooks.moveEnd.trigger(flowTransform)
+    }
+  })
+
   d3s
     ?.on('wheel', (event: WheelEvent) => {
       if (zoomKeyPressed.value) {
@@ -163,51 +153,24 @@ onMounted(async () => {
     // default filter for d3-zoom
     return (!event.ctrlKey || event.type === 'wheel') && !event.button
   })
-
-  watch(
-    [width, height],
-    ([newWidth, newHeight]) => {
-      store.dimensions.width = newWidth
-      store.dimensions.height = newHeight
-    },
-    { immediate: true },
-  )
-  watch(
-    transform,
-    (val) => {
-      const { x, y } = clampPosition(val, store.translateExtent)
-      store.transform = [x, y, clamp(val.zoom, store.minZoom, store.maxZoom)]
-    },
-    { immediate: true },
-  )
-
-  store.paneReady = true
-
-  // if ssr we can't wait for dimensions, they'll never really exist
-  const window = useWindow()
-  if ('screen' in window)
-    await until(store.dimensions).toMatch(({ height, width }) => !isNaN(width) && width > 0 && !isNaN(height) && height > 0)
-
-  const { zoomIn, zoomOut, zoomTo, setTransform, getTransform, fitView, fitBounds, setCenter } = useZoomPanHelper(store)
-  const instance: FlowInstance = {
-    fitView: (params = { padding: 0.1 }) => fitView(params),
-    zoomIn,
-    zoomOut,
-    zoomTo,
-    setTransform,
-    getTransform,
-    setCenter,
-    fitBounds,
-    project: onLoadProject(store),
-    getElements: onLoadGetElements(store),
-    getNodes: onLoadGetNodes(store),
-    getEdges: onLoadGetEdges(store),
-    toObject: onLoadToObject(store),
-  }
-  store.instance = instance
-  props.fitViewOnInit && instance.fitView()
-  store.hooks.paneReady.trigger(instance)
 })
+
+watch(
+  [width, height],
+  ([newWidth, newHeight]) => {
+    store.dimensions.width = newWidth
+    store.dimensions.height = newHeight
+  },
+  { immediate: true },
+)
+watch(
+  transform,
+  (val) => {
+    const { x, y } = clampPosition(val, store.translateExtent)
+    store.transform = [x, y, clamp(val.zoom, store.minZoom, store.maxZoom)]
+  },
+  { immediate: true },
+)
 </script>
 <script lang="ts">
 export default {