Add onViewReadySuspense hook

src/core/Algorithm.tsx

@@ -8,8 +8,8 @@ import { usePrevious } from '../utils/usePrevious';
 import useUnmount from '../utils/useUnmount';
 import {
   DownstreamContext,
-  useDownstream,
-  useRepresentation,
+  useDownstreamContext,
+  useRepresentationContext,
 } from './contexts';
 
 export interface AlgorithmProps extends PropsWithChildren {
@@ -46,8 +46,8 @@ export default function Algorithm(props: AlgorithmProps) {
     return algo;
   });
 
-  const representation = useRepresentation();
-  const downstream = useDownstream();
+  const representation = useRepresentationContext();
+  const downstream = useDownstreamContext();
 
   useEffect(() => {
     let algoChanged = false;

src/core/CellData.tsx

@@ -1,8 +1,8 @@
 import { PropsWithChildren, useCallback } from 'react';
-import { FieldDataContext, useDataset } from './contexts';
+import { FieldDataContext, useDatasetContext } from './contexts';
 
 export default function CellData(props: PropsWithChildren) {
-  const dataset = useDataset();
+  const dataset = useDatasetContext();
   const getCellData = useCallback(() => {
     return dataset.getDataSet().getCellData();
   }, [dataset]);

src/core/DataArray.ts

@@ -8,7 +8,7 @@ import deletionRegistry from '../utils/DeletionRegistry';
 import useGetterRef from '../utils/useGetterRef';
 import { usePrevious } from '../utils/usePrevious';
 import useUnmount from '../utils/useUnmount';
-import { useDataset, useFieldData } from './contexts';
+import { useDatasetContext, useFieldDataContext } from './contexts';
 
 export interface DataArrayProps {
   /**
@@ -61,8 +61,8 @@ export default function DataArray(props: DataArrayProps) {
     return da;
   });
 
-  const getFieldData = useFieldData();
-  const dataset = useDataset();
+  const getFieldData = useFieldDataContext();
+  const dataset = useDatasetContext();
 
   const { registration = DefaultProps.registration } = props;
 

src/core/Dataset.tsx

@@ -1,14 +1,14 @@
 import { vtkObject } from '@kitware/vtk.js/interfaces';
 import { useEffect } from 'react';
-import { useDownstream, useRepresentation } from './contexts';
+import { useDownstreamContext, useRepresentationContext } from './contexts';
 
 export interface DatasetProps {
   dataset: vtkObject | null;
 }
 
 export default function Dataset(props: DatasetProps) {
-  const representation = useRepresentation();
-  const downstream = useDownstream();
+  const representation = useRepresentationContext();
+  const downstream = useDownstreamContext();
 
   const { dataset } = props;
 

src/core/FieldData.tsx

@@ -1,8 +1,8 @@
 import { PropsWithChildren, useCallback } from 'react';
-import { FieldDataContext, useDataset } from './contexts';
+import { FieldDataContext, useDatasetContext } from './contexts';
 
 export default function FieldData(props: PropsWithChildren) {
-  const dataset = useDataset();
+  const dataset = useDatasetContext();
   const getFieldData = useCallback(() => {
     return dataset.getDataSet().getFieldData();
   }, [dataset]);

src/core/ImageData.tsx

@@ -11,7 +11,11 @@ import { IDataset } from '../types';
 import deletionRegistry from '../utils/DeletionRegistry';
 import useGetterRef from '../utils/useGetterRef';
 import useUnmount from '../utils/useUnmount';
-import { DatasetContext, useDownstream, useRepresentation } from './contexts';
+import {
+  DatasetContext,
+  useDownstreamContext,
+  useRepresentationContext,
+} from './contexts';
 
 export interface ImageDataProps extends PropsWithChildren {
   /**
@@ -63,8 +67,8 @@ export default forwardRef(function PolyData(props: ImageDataProps, fwdRef) {
     return im;
   });
 
-  const representation = useRepresentation();
-  const downstream = useDownstream();
+  const representation = useRepresentationContext();
+  const downstream = useDownstreamContext();
 
   // dataset API
   const dataset = useMemo<IDataset<vtkImageData>>(

src/core/PointData.tsx

@@ -1,8 +1,8 @@
 import { PropsWithChildren, useCallback } from 'react';
-import { FieldDataContext, useDataset } from './contexts';
+import { FieldDataContext, useDatasetContext } from './contexts';
 
 export default function PointData(props: PropsWithChildren) {
-  const dataset = useDataset();
+  const dataset = useDatasetContext();
   const getPointData = useCallback(() => {
     return dataset.getDataSet().getPointData();
   }, [dataset]);

src/core/PolyData.tsx

@@ -17,7 +17,11 @@ import deletionRegistry from '../utils/DeletionRegistry';
 import useGetterRef from '../utils/useGetterRef';
 import { usePrevious } from '../utils/usePrevious';
 import useUnmount from '../utils/useUnmount';
-import { DatasetContext, useDownstream, useRepresentation } from './contexts';
+import {
+  DatasetContext,
+  useDownstreamContext,
+  useRepresentationContext,
+} from './contexts';
 
 export interface PolyDataProps extends PropsWithChildren {
   /**
@@ -103,8 +107,8 @@ export default forwardRef(function PolyData(props: PolyDataProps, fwdRef) {
     return pd;
   });
 
-  const representation = useRepresentation();
-  const downstream = useDownstream();
+  const representation = useRepresentationContext();
+  const downstream = useDownstreamContext();
 
   // dataset API
   const dataset = useMemo<IDataset<vtkPolyData>>(

src/core/Reader.tsx

@@ -4,7 +4,7 @@ import vtk from '@kitware/vtk.js/vtk';
 import { PropsWithChildren, useCallback, useEffect, useRef } from 'react';
 import { VtkConstructor } from '../types';
 import deletionRegistry from '../utils/DeletionRegistry';
-import { useDownstream, useRepresentation } from './contexts';
+import { useDownstreamContext, useRepresentationContext } from './contexts';
 
 export interface ReaderProps extends PropsWithChildren {
   /**
@@ -71,7 +71,7 @@ export default function Reader(props: ReaderProps) {
     );
   }
 
-  const representation = useRepresentation();
+  const representation = useRepresentationContext();
 
   const createReader = useCallback(() => {
     if (typeof vtkClass === 'string') {
@@ -138,7 +138,7 @@ export default function Reader(props: ReaderProps) {
 
   // --- downstream registration --- //
 
-  const downstream = useDownstream();
+  const downstream = useDownstreamContext();
   const { port } = props;
 
   useEffect(() => {

src/core/ShareDataSet.tsx

@@ -27,9 +27,9 @@ import {
   DownstreamContext,
   RepresentationContext,
   ShareDataSetContext,
-  useDownstream,
-  useRepresentation,
-  useShareDataSet,
+  useDownstreamContext,
+  useRepresentationContext,
+  useShareDataSetContext,
 } from './contexts';
 import useDataEvents from './modules/useDataEvents';
 
@@ -138,7 +138,7 @@ export interface RegisterDataSetProps extends PropsWithChildren {
 }
 
 export function RegisterDataSet(props: RegisterDataSetProps) {
-  const share = useShareDataSet();
+  const share = useShareDataSetContext();
   const { id } = props;
 
   // --- handle registrations --- //
@@ -206,10 +206,10 @@ export interface UseDataSetProps extends PropsWithChildren {
 
 export function UseDataSet(props: UseDataSetProps) {
   const { id, port = 0 } = props;
-  const share = useShareDataSet();
+  const share = useShareDataSetContext();
   // TODO if useDataSet is input to an algorithm, should representation be null?
-  const representation = useRepresentation();
-  const downstream = useDownstream();
+  const representation = useRepresentationContext();
+  const downstream = useDownstreamContext();
 
   useEffect(() => {
     return share.onDataAvailable(id, (ds) => {

src/core/View.tsx

@@ -24,6 +24,7 @@ export default forwardRef(function View(props: ViewProps, fwdRef) {
       multiViewRoot ? parentedViewRef.current : singleViewRef.current;
     return {
       isInMultiViewRoot: () => multiViewRoot,
+      isMounted: () => getView()?.isMounted() ?? false,
       getViewContainer: () => getView()?.getViewContainer() ?? null,
       getOpenGLRenderWindow: () => getView()?.getOpenGLRenderWindow() ?? null,
       getRenderWindow: () => getView()?.getRenderWindow() ?? null,

src/core/VolumeController.tsx

@@ -5,7 +5,7 @@ import { Contexts } from '..';
 import deletionRegistry from '../utils/DeletionRegistry';
 import useGetterRef from '../utils/useGetterRef';
 import useUnmount from '../utils/useUnmount';
-import { useRepresentation } from './contexts';
+import { useRepresentationContext } from './contexts';
 
 export interface VolumeControllerProps {
   /**
@@ -35,7 +35,7 @@ export default function VolumeController(props: VolumeControllerProps) {
   const view = useContext(Contexts.ViewContext);
   if (!view) throw new Error('Need view context');
 
-  const volumeRep = useRepresentation();
+  const volumeRep = useRepresentationContext();
 
   const updateWidget = useCallback(() => {
     const volume = volumeRep.getMapper()?.getInputData() as

src/core/contexts.ts

@@ -37,6 +37,12 @@ export const MultiViewRootContext = createContext<boolean>(false);
 
 export const ViewContext = createContext<IView | null>(null);
 
+export function useViewContext() {
+  const view = useContext(ViewContext);
+  if (!view) throw new Error('No View context!');
+  return view;
+}
+
 export function useRenderWindowContext() {
   const rw = useContext(RenderWindowContext);
   if (!rw) throw new Error('No RenderWindow context!');
@@ -49,31 +55,31 @@ export function useRendererContext() {
   return r;
 }
 
-export function useFieldData<T = vtkFieldData>() {
+export function useFieldDataContext<T = vtkFieldData>() {
   const fd = useContext(FieldDataContext);
   if (!fd) throw new Error('No FieldData context!');
   return fd as () => T;
 }
 
-export function useDataset<T = vtkDataSet>() {
+export function useDatasetContext<T = vtkDataSet>() {
   const ds = useContext(DatasetContext);
   if (!ds) throw new Error('No Dataset context!');
   return ds as IDataset<T>;
 }
 
-export function useRepresentation() {
+export function useRepresentationContext() {
   const rep = useContext(RepresentationContext);
   if (!rep) throw new Error('No Representation context!');
   return rep;
 }
 
-export function useDownstream() {
+export function useDownstreamContext() {
   const ds = useContext(DownstreamContext);
   if (!ds) throw new Error('No Downstream context!');
   return ds;
 }
 
-export function useShareDataSet() {
+export function useShareDataSetContext() {
   const share = useContext(ShareDataSetContext);
   if (!share) throw new Error('No ShareDataSet context!');
   return share;

src/core/internal/ParentedView.tsx

@@ -27,6 +27,7 @@ import {
 } from '../modules/useInteractorStyle';
 import useViewEvents, { ViewEvents } from '../modules/useViewEvents';
 import Renderer from '../Renderer';
+import { viewMountedEvent } from './events';
 import { DefaultProps, ViewProps } from './view-shared';
 
 /**
@@ -172,9 +173,16 @@ const ParentedView = forwardRef(function ParentedView(
 
   // --- api --- //
 
+  let mounted = false;
+  useMount(() => {
+    mounted = true;
+    viewMountedEvent.trigger();
+  });
+
   const api = useMemo<IView>(
     () => ({
       isInMultiViewRoot: () => true,
+      isMounted: () => mounted,
       getViewContainer: () => containerRef.current,
       getOpenGLRenderWindow: () => openGLRenderWindowAPI,
       getRenderWindow: () => renderWindowAPI,
@@ -187,6 +195,7 @@ const ParentedView = forwardRef(function ParentedView(
         rendererRef.current?.resetCamera(boundsToUse),
     }),
     [
+      mounted,
       openGLRenderWindowAPI,
       renderWindowAPI,
       getInteractorStyle,

src/core/internal/SingleView.tsx

@@ -24,6 +24,7 @@ import useViewEvents, { ViewEvents } from '../modules/useViewEvents';
 import OpenGLRenderWindow from '../OpenGLRenderWindow';
 import Renderer from '../Renderer';
 import RenderWindow from '../RenderWindow';
+import { viewMountedEvent } from './events';
 import { DefaultProps, ViewProps } from './view-shared';
 
 /**
@@ -84,9 +85,16 @@ const SingleView = forwardRef(function SingleView(props: ViewProps, fwdRef) {
 
   // --- api --- //
 
+  let mounted = false;
+  useMount(() => {
+    mounted = true;
+    viewMountedEvent.trigger();
+  });
+
   const api = useMemo<IView>(
     () => ({
       isInMultiViewRoot: () => false,
+      isMounted: () => mounted,
       getViewContainer: () =>
         openGLRenderWindowRef.current?.getContainer() ?? null,
       getOpenGLRenderWindow: () => openGLRenderWindowRef.current,
@@ -99,7 +107,7 @@ const SingleView = forwardRef(function SingleView(props: ViewProps, fwdRef) {
       resetCamera: (boundsToUse?: Bounds) =>
         rendererRef.current?.resetCamera(boundsToUse),
     }),
-    [getInteractorStyle, setInteractorStyle]
+    [mounted, getInteractorStyle, setInteractorStyle]
   );
 
   useImperativeHandle(fwdRef, () => api);

src/core/internal/events.ts

@@ -0,0 +1,33 @@
+export type EventListener = (...args: any[]) => void;
+
+function createEvent() {
+  const callbacks: EventListener[] = [];
+
+  const off = (callback: EventListener) => {
+    const idx = callbacks.indexOf(callback);
+    if (idx === -1) return;
+    callbacks.splice(idx, 1);
+  };
+
+  const on = (callback: EventListener) => {
+    callbacks.push(callback);
+    return () => off(callback);
+  };
+
+  const once = (callback: EventListener) => {
+    const stop = on(() => {
+      stop();
+      callback();
+    });
+  };
+
+  const trigger = (...args: any[]) => {
+    callbacks.forEach((cb) => {
+      cb(...args);
+    });
+  };
+
+  return { off, on, once, trigger };
+}
+
+export const viewMountedEvent = createEvent();

src/index.ts

@@ -6,6 +6,7 @@ import '@kitware/vtk.js/Rendering/OpenGL/Profiles/Volume';
 export { default as Algorithm } from './core/Algorithm';
 export type { AlgorithmProps } from './core/Algorithm';
 export { default as CellData } from './core/CellData';
+export * from './core/contexts';
 export * as Contexts from './core/contexts';
 export { default as DataArray } from './core/DataArray';
 export type { DataArrayProps } from './core/DataArray';
@@ -46,3 +47,4 @@ export { default as View } from './core/View';
 export type { ViewProps } from './core/View';
 export { default as VolumeController } from './core/VolumeController';
 export { default as VolumeRepresentation } from './core/VolumeRepresentation';
+export * from './suspense';

src/suspense/index.ts

@@ -0,0 +1 @@
+export * from './useViewReadySuspense';