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import {
cache as cornerstoneCache,
Enums,
eventTarget,
utilities,
VolumeViewport3D,
} from '@cornerstonejs/core';
import { useByteArray } from '@ohif/ui-next';
import { getImageIdFromCacheEvent, getImageIndexFromEvent, isProgressFullMode } from './helpers';
import { ImageSliceData, ViewportData } from './types';
export function useProgressScrollbarMode({
viewportData,
viewportId,
element,
cornerstoneViewportService,
}: {
viewportData: ViewportData;
viewportId: string;
element: HTMLElement;
cornerstoneViewportService: AppTypes.CornerstoneViewportService;
}) {
const [isFullMode, setIsFullMode] = useState(false);
const lastViewPlaneNormalRef = useRef<number[] | null>(null);
/**
* Tracks whether this viewport should render full progress UI (stack or acquisition-plane
* orthographic volume) versus minimal UI. We compute once on setup and recompute on each
* CAMERA_MODIFIED event so stack->MPR transitions and acquisition-plane changes are reflected
* immediately.
*/
useEffect(() => {
if (!viewportData) {
return;
}
const updateMode = () => {
const viewport = cornerstoneViewportService.getCornerstoneViewport(viewportId);
const viewportImageData = viewport?.getImageData?.();
const nextViewPlaneNormal = viewport?.getCamera?.()?.viewPlaneNormal as number[] | undefined;
// Do not update the lastViewPlaneNormalRef until we have a valid viewportImageData.
// Without viewportImageData, the viewport is not fully initialized and the isAcquisitionPlane
// check will not be accurate.
if (viewportImageData && nextViewPlaneNormal) {
lastViewPlaneNormalRef.current = [...nextViewPlaneNormal];
}
const nextMode = isProgressFullMode(viewportData, viewport);
setIsFullMode(prevMode => (prevMode === nextMode ? prevMode : nextMode));
};
updateMode();
const onCameraModified = () => {
const viewport = cornerstoneViewportService.getCornerstoneViewport(viewportId);
const nextViewPlaneNormal = viewport?.getCamera?.()?.viewPlaneNormal as number[] | undefined;
const previousViewPlaneNormal = lastViewPlaneNormalRef.current;
// Ignore camera updates that keep the same orientation (pan/zoom/scroll).
if (nextViewPlaneNormal && previousViewPlaneNormal) {
if (utilities.isEqual(nextViewPlaneNormal, previousViewPlaneNormal)) {
return;
}
}
updateMode();
};
element.addEventListener(Enums.Events.CAMERA_MODIFIED, onCameraModified);
return () => {
element.removeEventListener(Enums.Events.CAMERA_MODIFIED, onCameraModified);
};
}, [viewportData, viewportId, cornerstoneViewportService, element]);
return isFullMode;
}
export function useViewportSliceSync({
viewportData,
viewportId,
element,
cornerstoneViewportService,
setImageSliceData,
}: {
viewportData: ViewportData;
viewportId: string;
element: HTMLElement;
cornerstoneViewportService: AppTypes.CornerstoneViewportService;
setImageSliceData: (data: ImageSliceData) => void;
}) {
/**
* Keeps shared slice state in sync: first initialize from the live viewport snapshot, then
* subscribe to navigation/render events for incremental updates while users scroll.
*/
useEffect(() => {
if (!viewportData) {
return;
}
const viewport = cornerstoneViewportService.getCornerstoneViewport(viewportId);
if (viewport && !(viewport instanceof VolumeViewport3D)) {
try {
const currentImageIndex = viewport.getCurrentImageIdIndex();
const currentNumberOfSlices = viewport.getNumberOfSlices();
setImageSliceData({
imageIndex: currentImageIndex,
numberOfSlices: currentNumberOfSlices,
});
} catch (error) {
console.warn(error);
}
}
const { viewportType } = viewportData;
const eventId =
(viewportType === Enums.ViewportType.STACK && Enums.Events.STACK_NEW_IMAGE) ||
(viewportType === Enums.ViewportType.ORTHOGRAPHIC && Enums.Events.VOLUME_NEW_IMAGE) ||
Enums.Events.IMAGE_RENDERED;
const updateIndex = event => {
const viewport = cornerstoneViewportService.getCornerstoneViewport(viewportId);
Iif (!viewport || viewport instanceof VolumeViewport3D) {
return;
}
const nextImageIndex = getImageIndexFromEvent(event);
Iif (nextImageIndex == null) {
return;
}
const nextNumberOfSlices = viewport.getNumberOfSlices();
setImageSliceData({
imageIndex: nextImageIndex,
numberOfSlices: nextNumberOfSlices,
});
};
element.addEventListener(eventId, updateIndex);
return () => {
element.removeEventListener(eventId, updateIndex);
};
}, [viewportData, element, viewportId, cornerstoneViewportService, setImageSliceData]);
}
export function useLoadedSliceBytes({
isFullMode,
numberOfSlices,
viewportData,
imageIds,
imageIdToIndex,
loadedBatchIntervalMs,
}: {
isFullMode: boolean;
numberOfSlices: number;
viewportData: ViewportData;
imageIds: string[];
imageIdToIndex: Map<string, number>;
loadedBatchIntervalMs: number;
}) {
const loadedState = useByteArray(numberOfSlices || 0, loadedBatchIntervalMs);
const {
resetWith: resetLoaded,
setByte: setLoadedByte,
clearByte: clearLoadedByte,
} = loadedState;
/**
* Keeps the loaded byte array in sync with Cornerstone cache: seed from cache whenever stack /
* mode / slice count changes, then subscribe so cache add/remove updates stay incremental.
* Seeding runs immediately before registering listeners in the same effect.
*/
useEffect(() => {
if (isFullMode && numberOfSlices) {
resetLoaded(bytes => {
for (let i = 0; i < bytes.length; i++) {
const imageId = imageIds[i];
if (imageId && cornerstoneCache.isLoaded(imageId)) {
bytes[i] = 1;
}
}
});
}
if (!isFullMode || !viewportData) {
return;
}
const markLoaded = event => {
const imageId = getImageIdFromCacheEvent(event);
Iif (!imageId) {
return;
}
const index = imageIdToIndex.get(imageId);
if (index !== undefined) {
setLoadedByte(index);
}
};
const markRemoved = event => {
const imageId = getImageIdFromCacheEvent(event);
Iif (!imageId) {
return;
}
const index = imageIdToIndex.get(imageId);
Iif (index !== undefined) {
clearLoadedByte(index);
}
};
eventTarget.addEventListener(Enums.Events.IMAGE_CACHE_IMAGE_ADDED, markLoaded);
eventTarget.addEventListener(Enums.Events.IMAGE_CACHE_IMAGE_REMOVED, markRemoved);
return () => {
eventTarget.removeEventListener(Enums.Events.IMAGE_CACHE_IMAGE_ADDED, markLoaded);
eventTarget.removeEventListener(Enums.Events.IMAGE_CACHE_IMAGE_REMOVED, markRemoved);
};
}, [
imageIds,
isFullMode,
numberOfSlices,
viewportData,
imageIdToIndex,
resetLoaded,
setLoadedByte,
clearLoadedByte,
]);
return loadedState;
}
export function useViewedSliceBytes({
isFullMode,
numberOfSlices,
imageIndex,
imageIds,
imageIdToIndex,
viewedDwellMs,
viewedDataService,
}: {
isFullMode: boolean;
numberOfSlices: number;
imageIndex: number;
imageIds: string[];
imageIdToIndex: Map<string, number>;
viewedDwellMs: number;
viewedDataService: AppTypes.ViewedDataService;
}) {
const viewedState = useByteArray(numberOfSlices || 0);
const { resetWith: resetViewed, setByte: setViewedByte } = viewedState;
/**
* Keeps the viewed byte array in sync with the global viewed-data store: seed from the store
* whenever stack / mode / slice count changes, then subscribe so `markDataViewed` updates stay
* incremental. Seeding runs immediately before registering the listener in the same effect.
*/
useEffect(() => {
if (isFullMode && numberOfSlices) {
resetViewed(bytes => {
for (let i = 0; i < bytes.length; i++) {
const imageId = imageIds[i];
if (imageId && viewedDataService?.isDataViewed(imageId)) {
bytes[i] = 1;
}
}
});
}
Iif (!viewedDataService) {
return;
}
const subscription = viewedDataService.subscribeViewedDataChanges(
({
viewedDataId,
viewedDataCleared,
}: {
viewedDataId?: string;
viewedDataCleared?: boolean;
}) => {
if (!isFullMode || !numberOfSlices) {
return;
}
Iif (viewedDataCleared) {
resetViewed(bytes => {
bytes.fill(0);
});
return;
}
const index = imageIdToIndex.get(viewedDataId);
if (index !== undefined) {
setViewedByte(index);
}
}
);
return () => {
subscription.unsubscribe();
};
}, [
imageIds,
isFullMode,
numberOfSlices,
imageIdToIndex,
resetViewed,
setViewedByte,
viewedDataService,
]);
/**
* Marks slices as viewed in full mode. With `viewedDwellMs === 0`, marking is immediate on
* index change; otherwise a dwell timer is used and cleaned up on subsequent changes/unmount.
*/
useEffect(() => {
if (!isFullMode || !numberOfSlices) {
return;
}
const markViewed = (targetIndex: number) => {
setViewedByte(targetIndex);
const imageId = imageIds[targetIndex];
if (imageId) {
viewedDataService?.markDataViewed(imageId);
}
};
if (viewedDwellMs === 0) {
markViewed(imageIndex || 0);
return;
}
const timerId = window.setTimeout(() => {
markViewed(imageIndex || 0);
}, viewedDwellMs);
return () => {
window.clearTimeout(timerId);
};
}, [
isFullMode,
numberOfSlices,
imageIndex,
imageIds,
setViewedByte,
viewedDwellMs,
viewedDataService,
]);
return viewedState;
}
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