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import { Events } from '../../enums';
import type { AnnotationSelectionChangeEventDetail } from '../../types/EventTypes';
import { getAnnotation } from './annotationState';
/*
* Constants
*/
const selectedAnnotationUIDs: Set<string> = new Set();
/*
* Interface (Public API)
*/
/**
* Set a given annotationUID as selected or deselected based on the provided
* selected value.
*
* @param annotationUID - The annotation UID to be selected
* @param selected - When true, the annotation is selected. When false, the annotation is deselected.
* @param preserveSelected - When true, preserves existing
* selections (i.e., the given annotation is appended to the selection set).
* When false (the default behavior) the currently selected items are discarded
* (i.e., the given annotation instance replaces the currently selected ones).
*/
function setAnnotationSelected(
annotationUID: string,
selected = true,
preserveSelected = false
): void {
if (selected) {
selectAnnotation(annotationUID, preserveSelected);
} else E{
deselectAnnotation(annotationUID);
}
}
/**
* Set a given annotation as selected.
*
* @param annotationUID - The annotation UID to be selected
* @param preserveSelected - When true, preserves existing
* selections (i.e., the given annotation is appended to the selection set).
* When false (the default behavior) the currently selected items are discarded
* (i.e., the given annotation instance replaces the currently selected ones).
*/
function selectAnnotation(
annotationUID: string,
preserveSelected = false
): void {
const detail = makeEventDetail();
Eif (!preserveSelected) {
clearSelectionSet(selectedAnnotationUIDs, detail);
const annotation = getAnnotation(annotationUID);
Eif (annotation) {
annotation.isSelected = true;
}
}
Eif (annotationUID && !selectedAnnotationUIDs.has(annotationUID)) {
selectedAnnotationUIDs.add(annotationUID);
detail.added.push(annotationUID);
const annotation = getAnnotation(annotationUID);
Eif (annotation) {
annotation.isSelected = true;
}
}
publish(detail, selectedAnnotationUIDs);
}
/**
* Deselect one or all annotations.
*
* @param annotationUID - If an annotation is provided that instance will be removed from
* the internal selection set. If none is given, ALL selections will be cleared.
*/
function deselectAnnotation(annotationUID?: string): void {
const detail = makeEventDetail();
if (annotationUID) {
if (selectedAnnotationUIDs.delete(annotationUID)) {
detail.removed.push(annotationUID);
const annotation = getAnnotation(annotationUID);
annotation.isSelected = false;
}
} else {
clearSelectionSet(selectedAnnotationUIDs, detail);
}
publish(detail, selectedAnnotationUIDs);
}
/**
* Return an array of ALL the selected annotationUIDs
* @returns An array of Annotation UIDs
*/
function getAnnotationsSelected(): Array<string> {
return Array.from(selectedAnnotationUIDs);
}
/**
* Given a tool name, return ALL the annotationUIDs for that tool that are selected
* @param toolName - The name of the tool you want to get the selected annotation for
* @returns An array of annotationUIDs
*/
function getAnnotationsSelectedByToolName(toolName: string): Array<string> {
return getAnnotationsSelected().filter((annotationUID) => {
const annotation = getAnnotation(annotationUID);
return annotation?.metadata?.toolName === toolName;
});
}
/**
* Given an annotationUID, return true if it is selected, false
* otherwise.
* @param annotationUID - Annotation UID
* @returns A boolean value.
*/
function isAnnotationSelected(annotationUID: string): boolean {
return selectedAnnotationUIDs.has(annotationUID);
}
/**
* Return the number of the selected annotation
* @returns The size of the selected annotation set
*/
function getAnnotationsSelectedCount(): number {
return selectedAnnotationUIDs.size;
}
/*
* Private Helpers
*/
function makeEventDetail(): AnnotationSelectionChangeEventDetail {
return Object.freeze({
added: [],
removed: [],
selection: [],
});
}
function clearSelectionSet(
selectionSet: Set<string>,
detail: AnnotationSelectionChangeEventDetail
): void {
selectionSet.forEach((value) => {
Eif (selectionSet.delete(value)) {
detail.removed.push(value);
const annotation = getAnnotation(value);
Eif (annotation) {
annotation.isSelected = false;
}
}
});
}
function publish(
detail: AnnotationSelectionChangeEventDetail,
selectionSet: Set<string>
) {
Eif (detail.added.length > 0 || detail.removed.length > 0) {
selectionSet.forEach((item) => void detail.selection.push(item));
triggerEvent(eventTarget, Events.ANNOTATION_SELECTION_CHANGE, detail);
}
}
/*
* Exports
*/
export {
setAnnotationSelected,
getAnnotationsSelected,
getAnnotationsSelectedByToolName,
getAnnotationsSelectedCount,
deselectAnnotation,
isAnnotationSelected,
};
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