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class ViewportGridService extends PubSubService {
public static readonly EVENTS = {
ACTIVE_VIEWPORT_ID_CHANGED: 'event::activeviewportidchanged',
LAYOUT_CHANGED: 'event::layoutChanged',
GRID_STATE_CHANGED: 'event::gridStateChanged',
GRID_SIZE_CHANGED: 'event::gridSizeChanged',
VIEWPORTS_READY: 'event::viewportsReady',
VIEWPORT_ONDROP_HANDLED: 'event::viewportOnDropHandled',
};
public static REGISTRATION = {
name: 'viewportGridService',
altName: 'ViewportGridService',
create: ({ configuration = {}, servicesManager }) => {
return new ViewportGridService({ servicesManager });
},
};
serviceImplementation = {};
servicesManager: AppTypes.ServicesManager;
presentationIdProviders: Map<
string,
(id: string, { viewport, viewports, isUpdatingSameViewport, servicesManager }) => unknown
>;
constructor({ servicesManager }) {
super(ViewportGridService.EVENTS);
this.servicesManager = servicesManager;
this.serviceImplementation = {};
this.presentationIdProviders = new Map();
}
public addPresentationIdProvider(
id: string,
provider: (id: string, { viewport, viewports, isUpdatingSameViewport }) => unknown
): void {
this.presentationIdProviders.set(id, provider);
}
public setIsReferenceViewable(viewportId: string, isReferenceViewable: boolean): void {
this.serviceImplementation._setIsReferenceViewable(viewportId, isReferenceViewable);
}
public getPresentationId(id: string, viewportId: string): string | null {
const state = this.getState();
const viewport = state.viewports.get(viewportId);
return this._getPresentationId(id, {
viewport,
viewports: state.viewports,
});
}
private _getPresentationId(id, { viewport, viewports }) {
const isUpdatingSameViewport = [...viewports.values()].some(
v =>
v.displaySetInstanceUIDs?.toString() === viewport.displaySetInstanceUIDs?.toString() &&
v.viewportId === viewport.viewportId
);
const provider = this.presentationIdProviders.get(id);
if (provider) {
const result = provider(id, {
viewport,
viewports,
isUpdatingSameViewport,
servicesManager: this.servicesManager,
});
return result;
}
return null;
}
public getPresentationIds({ viewport, viewports }) {
// Use the keys of the Map to get all registered provider IDs
const registeredPresentationProviders = Array.from(this.presentationIdProviders.keys());
return registeredPresentationProviders.reduce((acc, id) => {
const value = this._getPresentationId(id, {
viewport,
viewports,
});
if (value !== null) {
acc[id] = value;
}
return acc;
}, {});
}
public setServiceImplementation({
getState: getStateImplementation,
setActiveViewportId: setActiveViewportIdImplementation,
setDisplaySetsForViewports: setDisplaySetsForViewportsImplementation,
setLayout: setLayoutImplementation,
reset: resetImplementation,
onModeExit: onModeExitImplementation,
set: setImplementation,
getNumViewportPanes: getNumViewportPanesImplementation,
setViewportIsReady: setViewportIsReadyImplementation,
setIsReferenceViewable: setIsReferenceViewableImplementation,
getViewportState: getViewportStateImplementation,
}): void {
if (getViewportStateImplementation) {
this.serviceImplementation._getViewportState = getViewportStateImplementation;
}
if (getStateImplementation) {
this.serviceImplementation._getState = getStateImplementation;
}
if (setActiveViewportIdImplementation) {
this.serviceImplementation._setActiveViewport = setActiveViewportIdImplementation;
}
if (setDisplaySetsForViewportsImplementation) {
this.serviceImplementation._setDisplaySetsForViewports =
setDisplaySetsForViewportsImplementation;
}
if (setLayoutImplementation) {
this.serviceImplementation._setLayout = setLayoutImplementation;
}
if (resetImplementation) {
this.serviceImplementation._reset = resetImplementation;
}
if (onModeExitImplementation) {
this.serviceImplementation._onModeExit = onModeExitImplementation;
}
if (setImplementation) {
this.serviceImplementation._set = setImplementation;
}
if (getNumViewportPanesImplementation) {
this.serviceImplementation._getNumViewportPanes = getNumViewportPanesImplementation;
}
if (setViewportIsReadyImplementation) {
this.serviceImplementation._setViewportIsReady = setViewportIsReadyImplementation;
}
if (setIsReferenceViewableImplementation) {
this.serviceImplementation._setIsReferenceViewable = setIsReferenceViewableImplementation;
}
}
public publishViewportsReady() {
this._broadcastEvent(this.EVENTS.VIEWPORTS_READY, {});
}
public publishViewportOnDropHandled(eventData) {
this._broadcastEvent(this.EVENTS.VIEWPORT_ONDROP_HANDLED, { eventData });
}
public setActiveViewportId(id: string) {
Iif (id === this.getActiveViewportId()) {
return;
}
this.serviceImplementation._setActiveViewport(id);
// Use queueMicrotask to delay the event broadcast
setTimeout(() => {
this._broadcastEvent(this.EVENTS.ACTIVE_VIEWPORT_ID_CHANGED, {
viewportId: id,
});
}, 0);
}
public getState(): AppTypes.ViewportGrid.State {
return this.serviceImplementation._getState();
}
public getViewportState(viewportId: string) {
return this.serviceImplementation._getViewportState(viewportId);
}
public setViewportIsReady(viewportId, callback) {
this.serviceImplementation._setViewportIsReady(viewportId, callback);
}
public getActiveViewportId() {
const state = this.getState();
return state.activeViewportId;
}
public setViewportGridSizeChanged() {
const state = this.getState();
this._broadcastEvent(this.EVENTS.GRID_SIZE_CHANGED, {
state,
});
}
public setDisplaySetsForViewport(props) {
// Just update a single viewport, but use the multi-viewport update for it.
this.setDisplaySetsForViewports([props]);
}
public async setDisplaySetsForViewports(viewportsToUpdate) {
await this.serviceImplementation._setDisplaySetsForViewports(viewportsToUpdate);
const state = this.getState();
const updatedViewports = [];
const removedViewportIds = [];
for (const viewport of viewportsToUpdate) {
const updatedViewport = state.viewports.get(viewport.viewportId);
if (updatedViewport) {
updatedViewports.push(updatedViewport);
const updatedDisplaySetUIDs = updatedViewport.displaySetInstanceUIDs || [];
const isCleared = updatedDisplaySetUIDs.length === 0;
Iif (isCleared) {
removedViewportIds.push(viewport.viewportId);
}
} else E{
removedViewportIds.push(viewport.viewportId);
}
}
setTimeout(() => {
this._broadcastEvent(ViewportGridService.EVENTS.GRID_STATE_CHANGED, {
state,
viewports: updatedViewports,
removedViewportIds,
});
});
}
/**
* Retrieves the display set instance UIDs for a given viewport.
* @param viewportId The ID of the viewport.
* @returns An array of display set instance UIDs.
*/
public getDisplaySetsUIDsForViewport(viewportId: string) {
const state = this.getState();
const viewport = state.viewports.get(viewportId);
return viewport?.displaySetInstanceUIDs;
}
/**
*
* @param numCols, numRows - the number of columns and rows to apply
* @param findOrCreateViewport is a function which takes the
* index position of the viewport, the position id, and a set of
* options that is initially provided as {} (eg to store intermediate state)
* The function returns a viewport object to use at the given position.
*/
public async setLayout({
numCols,
numRows,
layoutOptions,
layoutType = 'grid',
activeViewportId = undefined,
findOrCreateViewport = undefined,
isHangingProtocolLayout = false,
}) {
// Get the previous state before the layout change
const prevState = this.getState();
const prevViewportIds = new Set(prevState.viewports.keys());
await this.serviceImplementation._setLayout({
numCols,
numRows,
layoutOptions,
layoutType,
activeViewportId,
findOrCreateViewport,
isHangingProtocolLayout,
});
// Use queueMicrotask to ensure the layout changed event is published after
setTimeout(() => {
// Get the new state after the layout change
const state = this.getState();
const currentViewportIds = new Set(state.viewports.keys());
// Determine which viewport IDs have been removed
const removedViewportIds = [...prevViewportIds].filter(id => !currentViewportIds.has(id));
this._broadcastEvent(this.EVENTS.LAYOUT_CHANGED, {
numCols,
numRows,
});
this._broadcastEvent(this.EVENTS.GRID_STATE_CHANGED, {
state,
removedViewportIds,
});
}, 0);
}
public reset() {
this.serviceImplementation._reset();
}
/**
* The onModeExit must set the state of the viewport grid to a standard/clean
* state. To implement store/recover of the viewport grid, perform
* a state store in the mode or extension onModeExit, and recover that
* data if appropriate in the onModeEnter of the mode or extension.
*/
public onModeExit(): void {
this.serviceImplementation._onModeExit();
}
public set(newState) {
const prevState = this.getState();
const prevViewportIds = new Set(prevState.viewports.keys());
this.serviceImplementation._set(newState);
const state = this.getState();
const currentViewportIds = new Set(state.viewports.keys());
const removedViewportIds = [...prevViewportIds].filter(id => !currentViewportIds.has(id));
setTimeout(() => {
this._broadcastEvent(this.EVENTS.GRID_STATE_CHANGED, {
state,
removedViewportIds,
});
}, 0);
}
public getNumViewportPanes() {
return this.serviceImplementation._getNumViewportPanes();
}
public getLayoutOptionsFromState(
state: any
): { x: number; y: number; width: number; height: number }[] {
return Array.from(state.viewports.entries()).map(([_, viewport]) => {
return {
x: viewport.x,
y: viewport.y,
width: viewport.width,
height: viewport.height,
};
});
}
}
export default ViewportGridService;
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