fix: Hanging protocol state fixes (#3242)

* fix: Some residual issues with hanging protocol after state sync

fix: Some issues introduced by the state syncing changes

* fix: PR fixes, mostly code cleanup

* Improve a race condition in an automated test

* Remove obsolete code

* PR fixes

extensions/cornerstone/src/Viewport/OHIFCornerstoneViewport.tsx

@@ -220,15 +220,27 @@ const OHIFCornerstoneViewport = React.memo(props => {
     const currentPresentation = cornerstoneViewportService.getPresentation(
       viewportIndex
     );
-    const { presentationSync } = stateSyncService.getState();
-    if (currentPresentation) {
-      stateSyncService.store({
-        presentationSync: {
-          ...presentationSync,
-          [currentPresentation.id]: currentPresentation,
-        },
-      });
+    if (!currentPresentation || !currentPresentation.presentationIds) return;
+    const {
+      lutPresentationStore,
+      positionPresentationStore,
+    } = stateSyncService.getState();
+    const { presentationIds } = currentPresentation;
+    const { lutPresentationId, positionPresentationId } = presentationIds || {};
+    const storeState = {};
+    if (lutPresentationId) {
+      storeState.lutPresentationStore = {
+        ...lutPresentationStore,
+        [lutPresentationId]: currentPresentation,
+      };
     }
+    if (positionPresentationId) {
+      storeState.positionPresentationStore = {
+        ...positionPresentationStore,
+        [positionPresentationId]: currentPresentation,
+      };
+    }
+    stateSyncService.store(storeState);
   };
 
   const cleanUpServices = useCallback(() => {
@@ -384,18 +396,25 @@ const OHIFCornerstoneViewport = React.memo(props => {
 
       storePresentation();
 
-      const { presentationSync } = stateSyncService.getState();
-      const { presentationId } = viewportOptions;
-      const presentation = presentationId
-        ? (presentationSync[presentationId] as Presentation)
-        : null;
+      const {
+        lutPresentationStore,
+        positionPresentationStore,
+      } = stateSyncService.getState();
+      const { presentationIds } = viewportOptions;
+      const presentations = {
+        positionPresentation:
+          positionPresentationStore[presentationIds?.positionPresentationId],
+        lutPresentation:
+          lutPresentationStore[presentationIds?.lutPresentationId],
+      };
+      console.log('Using presentations', presentations);
 
       cornerstoneViewportService.setViewportData(
         viewportIndex,
         viewportData,
         viewportOptions,
         displaySetOptions,
-        presentation
+        presentations
       );
     };
 

extensions/cornerstone/src/init.tsx

@@ -98,9 +98,15 @@ export default async function init({
     _showCPURenderingModal(uiModalService, hangingProtocolService);
   }
 
-  // Stores a map from `presentationId` to a Presentation object so that
-  // an OHIFCornerstoneViewport can be redisplayed with the same attributes
-  stateSyncService.register('presentationSync', { clearOnModeExit: true });
+  // Stores a map from `lutPresentationId` to a Presentation object so that
+  // an OHIFCornerstoneViewport can be redisplayed with the same LUT
+  stateSyncService.register('lutPresentationStore', { clearOnModeExit: true });
+
+  // Stores a map from `positionPresentationId` to a Presentation object so that
+  // an OHIFCornerstoneViewport can be redisplayed with the same position
+  stateSyncService.register('positionPresentationStore', {
+    clearOnModeExit: true,
+  });
 
   const labelmapRepresentation =
     cornerstoneTools.Enums.SegmentationRepresentations.Labelmap;

extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts

@@ -1591,7 +1591,7 @@ class SegmentationService {
 
     segmentInfo.isVisible = isVisible;
 
-    cstSegmentation.config.visibility.setVisibilityForSegmentIndex(
+    cstSegmentation.config.visibility.setSegmentVisibility(
       toolGroupId,
       segmentationRepresentationUID,
       segmentIndex,

extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts

@@ -21,11 +21,7 @@ import {
   StackViewportData,
   VolumeViewportData,
 } from '../../types/CornerstoneCacheService';
-import {
-  Presentation,
-  StackPresentation,
-  VolumePresentation,
-} from '../../types/Presentation';
+import { Presentation, Presentations } from '../../types/Presentation';
 import {
   setColormap,
   setLowerUpperColorTransferFunction,
@@ -173,23 +169,30 @@ class CornerstoneViewportService extends PubSubService
     this.viewportsById.delete(viewportId);
   }
 
+  public setPresentations(viewport, presentations?: Presentations): void {
+    const properties = presentations.lutPresentation?.properties;
+    if (properties) viewport.setProperties(properties);
+    const camera = presentations.positionPresentation?.camera;
+    if (camera) viewport.setCamera(camera);
+  }
+
   public getPresentation(viewportIndex: number): Presentation {
     const viewportInfo = this.viewportsInfo.get(viewportIndex);
     if (!viewportInfo) return;
-    const {
-      presentationId: id,
-      viewportType,
-    } = viewportInfo.getViewportOptions();
-    if (!id) return;
+    const { viewportType, presentationIds } = viewportInfo.getViewportOptions();
 
     const csViewport = this.getCornerstoneViewportByIndex(viewportIndex);
     if (!csViewport) return;
 
     const properties = csViewport.getProperties();
+    if (properties.isComputedVOI) {
+      delete properties.voiRange;
+      delete properties.VOILUTFunction;
+    }
     const initialImageIndex = csViewport.getCurrentImageIdIndex();
     const camera = csViewport.getCamera();
     return {
-      id,
+      presentationIds,
       viewportType:
         !viewportType || viewportType === 'stack' ? 'stack' : 'volume',
       properties,
@@ -211,7 +214,7 @@ class CornerstoneViewportService extends PubSubService
     viewportData: StackViewportData | VolumeViewportData,
     publicViewportOptions: PublicViewportOptions,
     publicDisplaySetOptions: DisplaySetOptions[],
-    presentation?: Presentation
+    presentations?: Presentations
   ): void {
     const renderingEngine = this.getRenderingEngine();
     const viewportId =
@@ -276,7 +279,7 @@ class CornerstoneViewportService extends PubSubService
     renderingEngine.enableElement(viewportInput);
 
     const viewport = renderingEngine.getViewport(viewportId);
-    this._setDisplaySets(viewport, viewportData, viewportInfo, presentation);
+    this._setDisplaySets(viewport, viewportData, viewportInfo, presentations);
   }
 
   public getCornerstoneViewport(
@@ -340,7 +343,7 @@ class CornerstoneViewportService extends PubSubService
     viewport: Types.IStackViewport,
     viewportData: StackViewportData,
     viewportInfo: ViewportInfo,
-    presentation?: StackPresentation
+    presentations: Presentations
   ): void {
     const displaySetOptions = viewportInfo.getDisplaySetOptions();
 
@@ -353,7 +356,8 @@ class CornerstoneViewportService extends PubSubService
     this.viewportsDisplaySets.set(viewport.id, [displaySetInstanceUID]);
 
     let initialImageIndexToUse =
-      presentation?.initialImageIndex ?? initialImageIndex;
+      presentations?.positionPresentation?.initialImageIndex ??
+      initialImageIndex;
 
     if (
       initialImageIndexToUse === undefined ||
@@ -363,8 +367,8 @@ class CornerstoneViewportService extends PubSubService
         this._getInitialImageIndexForStackViewport(viewportInfo, imageIds) || 0;
     }
 
-    const properties = presentation?.properties || {};
-    if (!presentation?.properties) {
+    const properties = { ...presentations.lutPresentation?.properties };
+    if (!presentations.lutPresentation?.properties) {
       const { voi, voiInverted } = displaySetOptions[0];
       if (voi && (voi.windowWidth || voi.windowCenter)) {
         const { lower, upper } = csUtils.windowLevel.toLowHighRange(
@@ -385,7 +389,8 @@ class CornerstoneViewportService extends PubSubService
       // The scroll, however, works fine in CS3D
       viewport.scroll(initialImageIndexToUse);
       viewport.setProperties(properties);
-      if (presentation?.camera) viewport.setCamera(presentation.camera);
+      const camera = presentations.positionPresentation?.camera;
+      if (camera) viewport.setCamera(camera);
     });
   }
 
@@ -441,7 +446,7 @@ class CornerstoneViewportService extends PubSubService
     viewport: Types.IVolumeViewport,
     viewportData: VolumeViewportData,
     viewportInfo: ViewportInfo,
-    presentation: VolumePresentation
+    presentations: Presentations
   ): Promise<void> {
     // TODO: We need to overhaul the way data sources work so requests can be made
     // async. I think we should follow the image loader pattern which is async and
@@ -514,10 +519,18 @@ class CornerstoneViewportService extends PubSubService
     });
 
     // This returns the async continuation only
-    return this.setVolumesForViewport(viewport, volumeInputArray, presentation);
+    return this.setVolumesForViewport(
+      viewport,
+      volumeInputArray,
+      presentations
+    );
   }
 
-  public async setVolumesForViewport(viewport, volumeInputArray, presentation) {
+  public async setVolumesForViewport(
+    viewport,
+    volumeInputArray,
+    presentations
+  ) {
     const {
       displaySetService,
       segmentationService,
@@ -525,9 +538,7 @@ class CornerstoneViewportService extends PubSubService
     } = this.servicesManager.services;
 
     await viewport.setVolumes(volumeInputArray);
-    const { properties, camera } = presentation || {};
-    if (properties) viewport.setProperties(properties);
-    if (camera) viewport.setCamera(camera);
+    this.setPresentations(viewport, presentations);
 
     // load any secondary displaySets
     const displaySetInstanceUIDs = this.viewportsDisplaySets.get(viewport.id);
@@ -703,21 +714,21 @@ class CornerstoneViewportService extends PubSubService
     viewport: StackViewport | VolumeViewport,
     viewportData: StackViewportData | VolumeViewportData,
     viewportInfo: ViewportInfo,
-    presentation?: Presentation
+    presentations: Presentations = {}
   ): void {
     if (viewport instanceof StackViewport) {
       this._setStackViewport(
         viewport,
         viewportData as StackViewportData,
         viewportInfo,
-        presentation as StackPresentation
+        presentations
       );
     } else if (viewport instanceof VolumeViewport) {
       this._setVolumeViewport(
         viewport,
         viewportData as VolumeViewportData,
         viewportInfo,
-        presentation as VolumePresentation
+        presentations
       );
     } else {
       throw new Error('Unknown viewport type');

extensions/cornerstone/src/services/ViewportService/Viewport.ts

@@ -1,4 +1,5 @@
 import { Types, Enums } from '@cornerstonejs/core';
+import { Types as UITypes } from '@ohif/ui';
 import getCornerstoneBlendMode from '../../utils/getCornerstoneBlendMode';
 import getCornerstoneOrientation from '../../utils/getCornerstoneOrientation';
 import getCornerstoneViewportType from '../../utils/getCornerstoneViewportType';
@@ -15,12 +16,13 @@ export type InitialImageOptions = {
 };
 
 export type ViewportOptions = {
+  id?: string;
   viewportType: Enums.ViewportType;
   toolGroupId: string;
   viewportId: string;
   // Presentation ID to store/load presentation state from
-  presentationId?: string;
-  orientation?: Types.Orientation;
+  presentationIds?: UITypes.PresentationIds;
+  orientation?: Enums.OrientationAxis;
   background?: Types.Point3;
   syncGroups?: SyncGroup[];
   initialImageOptions?: InitialImageOptions;
@@ -33,11 +35,12 @@ export type ViewportOptions = {
 };
 
 export type PublicViewportOptions = {
+  id?: string;
   viewportType?: string;
   toolGroupId?: string;
-  presentationId?: string;
+  presentationIds?: UITypes.PresentationIds;
   viewportId?: string;
-  orientation?: string;
+  orientation?: Enums.OrientationAxis;
   background?: Types.Point3;
   syncGroups?: SyncGroup[];
   initialImageOptions?: InitialImageOptions;
@@ -51,6 +54,10 @@ export type DisplaySetSelector = {
 };
 
 export type PublicDisplaySetOptions = {
+  /** The display set options can have an id in order to distinguish
+   * it from other similar items.
+   */
+  id?: string;
   voi?: VOI;
   voiInverted?: boolean;
   blendMode?: string;
@@ -59,6 +66,7 @@ export type PublicDisplaySetOptions = {
 };
 
 export type DisplaySetOptions = {
+  id?: string;
   voi?: VOI;
   voiInverted: boolean;
   blendMode?: Enums.BlendModes;
@@ -177,7 +185,7 @@ class ViewportInfo {
     let viewportType = viewportOptionsEntry.viewportType;
     const {
       toolGroupId = DEFAULT_TOOLGROUP_ID,
-      presentationId,
+      presentationIds,
     } = viewportOptionsEntry;
     let orientation;
 
@@ -202,7 +210,7 @@ class ViewportInfo {
       viewportType: viewportType as Enums.ViewportType,
       orientation,
       toolGroupId,
-      presentationId,
+      presentationIds,
     });
   }
 

extensions/cornerstone/src/tools/CalibrationLineTool.ts

@@ -1,9 +1,10 @@
 import { metaData } from '@cornerstonejs/core';
-import { LengthTool } from '@cornerstonejs/tools';
-import { calibrateImageSpacing } from '@cornerstonejs/tools/dist/esm/utilities';
+import { LengthTool, utilities } from '@cornerstonejs/tools';
 import callInputDialog from '../utils/callInputDialog';
 import getActiveViewportEnabledElement from '../utils/getActiveViewportEnabledElement';
 
+const { calibrateImageSpacing } = utilities;
+
 /**
  * Calibration Line tool works almost the same as the
  */

extensions/cornerstone/src/types/Presentation.ts

@@ -1,23 +1,23 @@
 /** Store presentation data for either stack viewports or volume viewports */
 import { Types } from '@cornerstonejs/core';
+import { Types as UITypes } from '@ohif/ui';
 
-export interface BasePresentation {
-  id: string;
-  properties: Record<string, unknown>;
-  initialImageIndex?: number;
+/**
+ * Has information on the presentation of the viewport.
+ */
+export interface Presentation extends Types.StackViewportProperties {
+  presentationIds: UITypes.PresentationIds;
+  viewportType: string;
+  initialImageIndex: number;
   camera: Types.ICamera;
+  properties: Types.StackViewportProperties | Types.VolumeViewportProperties;
+  zoom?: number;
+  pan?: [number, number];
 }
 
-export interface StackPresentation extends BasePresentation {
-  viewportType: 'stack';
-}
-
-export interface VolumePresentation extends BasePresentation {
-  viewportType: 'volume';
-}
-
-// Currently it seems like the entire presentation state can be shared between
-// Stack and Volume, but is setup to allow differences
-export type Presentation = StackPresentation | VolumePresentation;
+export type Presentations = {
+  positionPresentation?: Presentation;
+  lutPresentation?: Presentation;
+};
 
 export default Presentation;

extensions/default/src/commandsModule.ts

@@ -153,8 +153,8 @@ const commandsModule = ({ servicesManager, commandsManager }) => {
         const restoreProtocol = !!viewportGridStore[storedHanging];
 
         if (
-          protocolId === hpInfo.hangingProtocolId &&
-          useStageIdx === hpInfo.stageIdx &&
+          protocolId === hpInfo.protocolId &&
+          useStageIdx === hpInfo.stageIndex &&
           !activeStudyUID
         ) {
           // Clear the HP setting to reset them

extensions/default/src/utils/reuseCachedLayouts.ts

@@ -58,7 +58,7 @@ const reuseCachedLayout = (
       }
       if (displaySetOptions[i]?.id) {
         displaySetSelectorMap[
-          `${activeStudyUID}: ${displaySetOptions[i].id}: ${displaySetOptions[i]
+          `${activeStudyUID}:${displaySetOptions[i].id}:${displaySetOptions[i]
             .matchedDisplaySetsIndex || 0}`
         ] = displaySetUID;
       }

extensions/test-extension/src/hp/hpMN.ts

@@ -186,7 +186,6 @@ const hpMN: Types.HangingProtocol.Protocol = {
         },
       },
       viewportStructure: {
-        layoutType: 'grid',
         layoutType: 'grid',
         properties: {
           rows: 1,
@@ -245,7 +244,6 @@ const hpMN: Types.HangingProtocol.Protocol = {
           },
           displaySets: [
             {
-              matchedDisplaySetsIndex: 1,
               id: 'defaultDisplaySetId',
             },
           ],

platform/core/src/services/StateSyncService/StateSyncService.ts

@@ -42,6 +42,12 @@ export default class StateSyncService extends PubSubService {
 
   public init(extensionManager: ExtensionManager): void { }
 
+  /** Registers a new sync store called `id`.  The state
+   * defines how the state is stored, and any default clearing of the
+   * state.
+   * A default store has the lifetime of the application.
+   * The other available store is cleared `onModeExit`
+   */
   public register(id: string, config: StateConfig): void {
     this.registeredStateSets[id] = config;
     this.store({ [id]: {} });

platform/core/src/types/HangingProtocol.ts

@@ -141,8 +141,8 @@ export type initialImageOptions = {
 };
 
 export type ViewportOptions = {
-  toolGroupId: string;
-  viewportType: string;
+  toolGroupId?: string;
+  viewportType?: string;
   id?: string;
   orientation?: string;
   viewportId?: string;

platform/docs/docs/platform/services/data/StateSyncService.md

@@ -60,13 +60,18 @@ clears all states registered with `clearOnModeExit: true`.
 To avoid clearing the state, the mode definition should store any transient
 state in the mode onModeExit and recover it in the `mode.onModeEnter`.
 
-## OHIF Registered State
-There are a number of defined states here.  It is recommended to update this
-list as states are added:
+## OHIF Registered State Sync Stores
+There are a number of defined stores here.  It is recommended to update this
+list as state stores are added:
+
+### Default Extension Stores
 
 * `viewportGridStore` has viewport grid restore information for returning to an earlier grid layout.
 * `reuseIdMap` has a map of names to display sets for preserving user changes to hp display set selections.
 * `hanging` has a map of the hanging protocol stage information applied (HPInfo)
-* `presentationSync` has the cornerstone presentation state information
 * `toggleHangingProtocol` has the previously applied hanging protocol, to toggle an HP off.
-* `querySync` has the previously applied query information.  Not fully implemented yet.
+
+### Cornerstone Extension Stores
+
+* `lutPresentationStore` has the cornerstone LUT (window level) presentation state information
+* `positionPresentationStore` has the cornerstone viewport position (camera, initial image) information

platform/ui/src/contextProviders/ViewportGridProvider.tsx

@@ -8,7 +8,7 @@ import React, {
 import PropTypes from 'prop-types';
 import isEqual from 'lodash.isequal';
 import viewportLabels from '../utils/viewportLabels';
-import getPresentationId from './getPresentationId';
+import getPresentationIds from './getPresentationIds';
 
 const DEFAULT_STATE = {
   activeViewportIndex: 0,
@@ -69,7 +69,7 @@ const reuseViewport = (idSet, viewport, stateViewports) => {
     // };
   }
   // Find a viewport instance number different from earlier viewports having
-  // the same presentationId as this one would - will be less than 10k
+  // the same presentationIds as this one would - will be less than 10k
   // viewports hopefully :-)
   for (let i = 0; i < 10000; i++) {
     const viewportId = 'viewport-' + i;
@@ -121,7 +121,10 @@ export function ViewportGridProvider({ children, service }) {
           displaySetOptions,
           viewportLabel: viewportLabels[viewportIndex],
         };
-        viewportOptions.presentationId = getPresentationId(newView, viewports);
+        viewportOptions.presentationIds = getPresentationIds(
+          newView,
+          viewports
+        );
 
         // Make sure we assign a viewport id
         newView = reuseViewport({}, newView, state.viewports);
@@ -207,8 +210,8 @@ export function ViewportGridProvider({ children, service }) {
             viewports[viewportIndex],
             state.viewports
           );
-          if (!viewport.viewportOptions.presentationId) {
-            viewport.viewportOptions.presentationId = getPresentationId(
+          if (!viewport.viewportOptions.presentationIds) {
+            viewport.viewportOptions.presentationIds = getPresentationIds(
               viewport,
               viewports
             );

platform/ui/src/contextProviders/getPresentationId.ts

@@ -1,73 +0,0 @@
-/**
- * Selects a presentation ID to use for this viewport.
- * This is done to allow the same display set to be displayed more than once
- * on screen, with different attributes such as window level and initial position.
- * Then, when redisplaying that, the nearest/most common attribute is re-used.
- *
- * For example, for display set <displaySetUID>, in a viewport of type volume,
- * the generated presentationID might be
- * `volume:axial:<displaySetUID>`.  This can then be used to store and retrieve
- * presentation information in state sync service 'presentationSync' state.
- *
- * The generated value attempts to generate a unique value for every type
- * of viewport which should have it's own presentation information.  Thus, the
- * following values are used for presentation ID:
- *
- * 1. viewportType - since the presentation information for a volume is different than for a stack
- * 2. orientation - since the camera is different for different orientations
- * 3. display set instance UID - since different display sets should get displayed differently
- * 4. instance count - since displaying the same series twice should allow applying different window level etc
- *
- * @param viewport requiring a presentation Id
- * @param viewports is the list of viewports being shown.  Any presentation ID's
- *         among them must not be re-used in order to have each viewport have it's own presentation ID.
- * @returns Presentation ID id, or undefined if nothing displayed
- */
-const getPresentationId = (viewport, viewports): string => {
-  if (!viewport) return;
-  const { viewportOptions, displaySetInstanceUIDs } = viewport;
-  if (!viewportOptions || !displaySetInstanceUIDs?.length) {
-    console.log('No viewport type or display sets in', viewport);
-    return;
-  }
-
-  const viewportType = viewportOptions.viewportType || 'stack';
-  const idArr = [viewportType, 0, ...displaySetInstanceUIDs];
-  if (viewportOptions.orientation) {
-    idArr.splice(2, 0, viewportOptions.orientation);
-  }
-
-  // Allow setting a custom presentation prefix in the hanging protocol
-  // This allows defining new
-  // presentation groups to be set automatically when one knows that the
-  // same display set will be displayed in different ways.
-  // This is the recommended way to manage a hanging protocol which displays
-  // multiple views of a single display set, eg to display brain, bone, soft
-  // tissue views in different viewports.
-  if (viewportOptions.presentationPrefix) {
-    idArr.push(viewportOptions.presentationPrefix);
-  }
-  if (!viewports) {
-    console.log('viewports not defined', idArr.join(','));
-    return idArr.join('&');
-  }
-
-  // This code finds the first unique index to add to the presentation id so that
-  // two viewports containing the same display set in the same type of viewport
-  // can have different presentation information.  This allows comparison of
-  // a single display set in two or more viewports, when the user has simply
-  // dragged and dropped the view in twice.  For example, it allows displaying
-  // bone, brain and soft tissue views of a single display set, and to still
-  // remember the specific changes to each viewport.
-  for (let displayInstance = 0; displayInstance < 128; displayInstance++) {
-    idArr[1] = displayInstance;
-    const testId = idArr.join('&');
-    if (!viewports.find(it => it.viewportOptions?.presentationId === testId)) {
-      break;
-    }
-  }
-  const id = idArr.join('&');
-  return id;
-};
-
-export default getPresentationId;

platform/ui/src/contextProviders/getPresentationIds.ts

@@ -0,0 +1,120 @@
+const JOIN_STR = '&';
+
+// The default lut presentation id if none defined
+const DEFAULT = 'default';
+
+// This code finds the first unique index to add to the presentation id so that
+// two viewports containing the same display set in the same type of viewport
+// can have different presentation information.  This allows comparison of
+// a single display set in two or more viewports, when the user has simply
+// dragged and dropped the view in twice.  For example, it allows displaying
+// bone, brain and soft tissue views of a single display set, and to still
+// remember the specific changes to each viewport.
+const addUniqueIndex = (arr, key, viewports) => {
+  arr.push(0);
+  // The 128 is just a value that is larger than how many viewports we
+  // display at once, used as an upper bound on how many unique presentation
+  // ID's might exist for a single display set at once.
+  for (let displayInstance = 0; displayInstance < 128; displayInstance++) {
+    arr[arr.length - 1] = displayInstance;
+    const testId = arr.join(JOIN_STR);
+    if (
+      !viewports.find(
+        viewport => viewport.viewportOptions?.presentationIds?.[key] === testId
+      )
+    ) {
+      break;
+    }
+  }
+};
+
+const getLutId = (ds): string => {
+  if (!ds || !ds.options) return DEFAULT;
+  if (ds.options.id) return ds.options.id;
+  const arr = Object.entries(ds.options).map(([key, val]) => `${key}=${value}`);
+  if (!arr.length) return DEFAULT;
+  return arr.join(JOIN_STR);
+};
+
+export type PresentationIds = {
+  positionPresentationId?: string;
+  lutPresentationId?: string;
+};
+
+/**
+ * Gets a set of presentation IDs for a viewport.  The presentation IDs are
+ * used to remember the presentation state of the viewport when it is navigated
+ * to different layouts.
+ *
+ * The design of this is setup to allow preserving the view information in the
+ * following cases:
+ *
+ *
+ *      * If a set of display sets was previously displayed in the same initial
+ *        position as it is currently being asked to be displayed,
+ *        then remember the camera position as previously displayed
+ *
+ *      * If a set of display sets was previously displayed with the same initial
+ *        LUT conditions, then remember the last LUT displayed for that display set
+ *        and re-apply it.
+ *
+ *      * Otherwise, apply the initial hanging protocol specified LUT and camera
+ *        position to new display sets.
+ *
+ * This means generating two presentationId keys:
+ *
+ *  `positionPresentationId`
+ *
+ *  Used for getting the camera/initial position state sync values.
+ *  This is a combination of:
+ *      * `viewportOptions.id`
+ *      * `viewportOptions.orientation`
+ *      * display set UID's - as displayed for this viewport, excluding seg
+ *      * a unique index number if the previous key is already displayed
+ *
+ * `lutPresentationId`
+ *
+ * Used for getting the voi LUT information.  Generated from:
+ *
+ *       * `displaySetOption[0].options` - including the id if present
+ *       * displaySetUID's
+ *       * a unique index number if the previously generated key is already
+ *         displayed.
+ *
+ * @param viewport requiring a presentation Id
+ * @param viewports is the list of viewports being shown.  Any presentation ID's
+ *         among them must not be re-used in order to have each viewport have it's own presentation ID.
+ * @returns PresentationIds
+ */
+const getPresentationIds = (viewport, viewports): PresentationIds => {
+  if (!viewport) return;
+  const {
+    viewportOptions,
+    displaySetInstanceUIDs,
+    displaySetOptions,
+  } = viewport;
+  if (!viewportOptions || !displaySetInstanceUIDs?.length) {
+    return;
+  }
+
+  const { id, orientation } = viewportOptions;
+  const lutId = getLutId(displaySetOptions[0]);
+  const lutPresentationArr = [lutId];
+
+  const positionPresentationArr = [orientation || 'acquisition'];
+  if (id) positionPresentationArr.push(id);
+
+  for (const uid of displaySetInstanceUIDs) {
+    positionPresentationArr.push(uid);
+    lutPresentationArr.push(uid);
+  }
+
+  addUniqueIndex(positionPresentationArr, 'positionPresentationId', viewports);
+  addUniqueIndex(lutPresentationArr, 'lutPresentationId', viewports);
+
+  const lutPresentationId = lutPresentationArr.join(JOIN_STR);
+  const positionPresentationId = positionPresentationArr.join(JOIN_STR);
+  return { lutPresentationId, positionPresentationId };
+};
+
+export default getPresentationIds;

platform/ui/src/types/index.ts

@@ -1,5 +1,6 @@
 import PropTypes from 'prop-types';
 import ThumbnailType from './ThumbnailType';
+import { PresentationIds } from '../contextProviders/getPresentationIds';
 
 // A few miscellaneous types declared inline here.
 
@@ -14,4 +15,4 @@ const StringNumber = PropTypes.oneOfType([PropTypes.string, PropTypes.number]);
  */
 const StringArray = PropTypes.oneOfType([PropTypes.string, PropTypes.array]);
 
-export { StringNumber, StringArray, ThumbnailType };
+export { StringNumber, StringArray, ThumbnailType, PresentationIds };

platform/viewer/cypress/integration/measurement-tracking/OHIFStudyBrowser.spec.js

@@ -51,6 +51,8 @@ describe('OHIF Study Viewer Page', function() {
   });
 
   it('performs double-click to load thumbnail in active viewport', () => {
+    // Have to finish rendering the image before this works
+    cy.wait(250);
     cy.get('[data-cy="study-browser-thumbnail"]:nth-child(2)').dblclick();
 
     //cy.get('@viewportInfoBottomLeft').should('contains.text', expectedText);

platform/viewer/src/components/ViewportGrid.tsx

@@ -1,6 +1,6 @@
 import React, { useEffect, useCallback } from 'react';
 import PropTypes from 'prop-types';
-import { ServicesManager } from '@ohif/core';
+import { ServicesManager, Types } from '@ohif/core';
 import { ViewportGrid, ViewportPane, useViewportGrid } from '@ohif/ui';
 import { utils } from '@ohif/core';
 import EmptyViewport from './EmptyViewport';
@@ -23,15 +23,6 @@ const ORIENTATION_MAP = {
   },
 };
 
-const createHpInfo = (protocol, stage, activeStudyUID) => {
-  return {
-    hangingProtocolId: protocol.id,
-    stageId: stage.stageId,
-    stageIdx: protocol.stages.findIndex(it => it === stage),
-    activeStudyUID,
-  };
-};
-
 const compareViewportOptions = (opts1, opts2) => {
   if ((opts1.viewportType || 'stack') != opts2.viewportType) {
     return false;
@@ -62,7 +53,7 @@ function ViewerViewportGrid(props) {
 
    */
   const updateDisplaySetsFromProtocol = (
-    protocol,
+    protocol: Types.HangingProtocol.Protocol,
     stage,
     activeStudyUID,
     viewportMatchDetails
@@ -119,7 +110,6 @@ function ViewerViewportGrid(props) {
       numCols,
       layoutType,
       layoutOptions,
-      hpInfo: createHpInfo(protocol, stage, activeStudyUID),
       findOrCreateViewport,
     });
   };