feat(core): add viewport helper to state

packages/core/src/composables/useOnInitHandler.ts

@@ -4,12 +4,33 @@ import { useVueFlow } from './useVueFlow'
 export function useOnInitHandler() {
   const vfInstance = useVueFlow()
 
-  watch(vfInstance.viewportInitialized, (isInitialized) => {
-    if (isInitialized) {
-      setTimeout(() => {
-        vfInstance.emits.init(vfInstance)
-        vfInstance.emits.paneReady(vfInstance)
-      }, 1)
-    }
-  })
+  watch(
+    () => vfInstance.viewportHelper.value.viewportInitialized,
+    (isInitialized) => {
+      if (isInitialized) {
+        setTimeout(() => {
+          // todo: call these when *nodes* are initialized instead of the viewport
+          // currently doesn't work quite right because the viewport dimensions are not yet available when the nodes are initialized
+          if (!vfInstance.fitViewOnInitDone.value && vfInstance.fitViewOnInit.value) {
+            vfInstance.fitView()
+          }
+
+          vfInstance.fitViewOnInitDone.value = true
+
+          // Here, we are making all nodes visible once we have the dimensions.
+          if (!document.querySelector('#vue-flow__initialized-styles')) {
+            const style = document.createElement('style')
+            style.id = 'vue-flow__initialized-styles'
+            document.head.appendChild(style)
+
+            const css = `.vue-flow__node { visibility: visible !important; }`
+            style.appendChild(document.createTextNode(css))
+          }
+
+          vfInstance.emits.init(vfInstance)
+          vfInstance.emits.paneReady(vfInstance)
+        }, 1)
+      }
+    },
+  )
 }

packages/core/src/composables/useViewport.ts

@@ -3,7 +3,7 @@ import { computed } from 'vue'
 import type { ComputedGetters, D3Selection, GraphNode, Project, State, ViewportFunctions } from '../types'
 import { clampPosition, getRectOfNodes, getTransformForBounds, pointToRendererPoint, rendererPointToPoint, warn } from '../utils'
 
-interface ExtendedViewport extends ViewportFunctions {
+export interface ViewportHelper extends ViewportFunctions {
   viewportInitialized: boolean
   screenToFlowCoordinate: Project
   flowToScreenCoordinate: Project
@@ -17,7 +17,7 @@ function noop() {
   return Promise.resolve(false)
 }
 
-const initialViewportHelper: ExtendedViewport = {
+const initialViewportHelper: ViewportHelper = {
   zoomIn: noop,
   zoomOut: noop,
   zoomTo: noop,
@@ -72,7 +72,7 @@ export function useViewport(state: State, getters: ComputedGetters) {
     })
   }
 
-  return computed<ExtendedViewport>(() => {
+  return computed<ViewportHelper>(() => {
     const isInitialized = state.d3Zoom && state.d3Selection && state.dimensions.width && state.dimensions.height
 
     if (!isInitialized) {

packages/core/src/store/actions.ts

@@ -939,6 +939,7 @@ export function useActions(
     toObject,
     fromObject,
     updateNodeInternals,
+    viewportHelper,
     $reset,
     $destroy: () => {},
   }

packages/core/src/store/state.ts

@@ -51,8 +51,6 @@ function defaultState(): State {
     d3Selection: null,
     d3ZoomHandler: null,
 
-    viewportInitialized: false,
-
     minZoom: 0.5,
     maxZoom: 2,
 

packages/core/src/types/store.ts

@@ -1,5 +1,6 @@
 import type { CSSProperties, ComputedRef, ToRefs } from 'vue'
 import type { KeyFilter } from '@vueuse/core'
+import type { ViewportHelper } from '../composables'
 import type {
   Dimensions,
   ElementData,
@@ -57,8 +58,6 @@ export interface State extends Omit<FlowOptions, 'id' | 'modelValue'> {
   readonly d3Selection: D3Selection | null
   readonly d3ZoomHandler: D3ZoomHandler | null
 
-  viewportInitialized: boolean
-
   /** use setMinZoom action to change minZoom */
   minZoom: number
   /** use setMaxZoom action to change maxZoom */
@@ -291,6 +290,8 @@ export interface Actions extends ViewportFunctions {
   getConnectedEdges: (nodesOrId: Node[] | string) => GraphEdge[]
   /** pan the viewport; return indicates if a transform has happened or not */
   panBy: (delta: XYPosition) => boolean
+  /** viewport helper instance */
+  viewportHelper: ComputedRef<ViewportHelper>
 
   /** reset state to defaults */
   $reset: () => void

tests/cypress/support/component.ts

@@ -8,20 +8,19 @@ import { VueFlow } from '@vue-flow/core'
 import type { FlowProps } from '@vue-flow/core'
 
 function mountVueFlow(props?: FlowProps, attrs?: Record<string, any>, slots?: Record<string, any>) {
-  cy.mount(VueFlow as any, {
+  cy.mount(VueFlow, {
     props: {
       id: 'test',
       fitViewOnInit: true,
       ...props,
     } as FlowProps,
     attrs: {
-      key: 'flowy',
       style: {
         height: '100vh',
         width: '100vw',
-      },
+      } as CSSStyleDeclaration,
       ...attrs,
-    } as Record<string, any>,
+    },
     slots,
   })
 }