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import { Events } from '../../enums';
import { Annotation } from '../../types';
import { AnnotationLockChangeEventDetail } from '../../types/EventTypes';
/*
* Constants
*/
const globalLockedAnnotationsSet: Set<Annotation> = new Set();
/*
* Interface (Public API)
*/
/**
* Set the "Locked" state of a given annotation instance.
*
* @triggers ANNOTATION_LOCK_CHANGE
*
* @param annotation - The annotation instance which will have
* its locked state changed. An event will only be triggered if the locked state
* of the given annotation instance changed.
* @param locked - A boolean value indicating if the instance should
* be locked (true) or not (false)
*/
function setAnnotationLocked(annotation: Annotation, locked = true): void {
const detail = makeEventDetail();
Eif (annotation) {
Iif (locked) {
lock(annotation, globalLockedAnnotationsSet, detail);
} else {
unlock(annotation, globalLockedAnnotationsSet, detail);
}
}
publish(detail, globalLockedAnnotationsSet);
}
/**
* Clears all the locked annotation
*
*/
function unlockAllAnnotations(): void {
const detail = makeEventDetail();
clearLockedAnnotationsSet(globalLockedAnnotationsSet, detail);
publish(detail, globalLockedAnnotationsSet);
}
/**
* Returns an array of all the annotation that is currently locked
* @returns An array of tool specific annotation objects.
*
*/
function getAnnotationsLocked(): Array<Annotation> {
return Array.from(globalLockedAnnotationsSet);
}
/**
* Given a Annotation object, return true if it is locked.
* @param annotation - Annotation
* @returns A boolean value.
*/
function isAnnotationLocked(annotation: Annotation): boolean {
return globalLockedAnnotationsSet.has(annotation);
}
/**
* Get the number of locked annotation objects in the global set of locked annotation
* objects.
* @returns The number of locked annotation objects.
*
*/
function getAnnotationsLockedCount(): number {
return globalLockedAnnotationsSet.size;
}
/**
* Properly initialize the isLocked on annotation, and set it as locked if
* isLocked is true.
* @param annotation - The annotation object to be checked.
*/
function checkAndDefineIsLockedProperty(annotation: Annotation): void {
Eif (annotation) {
const isLocked = !!annotation.isLocked;
Eif (shouldDefineIsLockedProperty(annotation)) {
Object.defineProperty(annotation, 'isLocked', {
configurable: false,
enumerable: true,
set: setIsLocked,
get: getIsLocked,
});
}
setAnnotationLocked(annotation, isLocked);
}
}
/*
* Private Helpers
*/
function makeEventDetail(): AnnotationLockChangeEventDetail {
return Object.freeze({
added: [],
removed: [],
locked: [],
});
}
function lock(
annotation: Annotation,
lockedAnnotationsSet: Set<Annotation>,
detail: AnnotationLockChangeEventDetail
): void {
if (!lockedAnnotationsSet.has(annotation)) {
lockedAnnotationsSet.add(annotation);
detail.added.push(annotation);
}
}
function unlock(
annotation: Annotation,
lockedAnnotationsSet: Set<Annotation>,
detail: AnnotationLockChangeEventDetail
): void {
Iif (lockedAnnotationsSet.delete(annotation)) {
detail.removed.push(annotation);
}
}
function clearLockedAnnotationsSet(
lockedAnnotationsSet: Set<Annotation>,
detail: AnnotationLockChangeEventDetail
): void {
lockedAnnotationsSet.forEach((annotation) => {
unlock(annotation, lockedAnnotationsSet, detail);
});
}
function publish(
detail: AnnotationLockChangeEventDetail,
lockedAnnotationsSet: Set<Annotation>
) {
Iif (detail.added.length > 0 || detail.removed.length > 0) {
lockedAnnotationsSet.forEach((item) => void detail.locked.push(item));
triggerEvent(eventTarget, Events.ANNOTATION_LOCK_CHANGE, detail);
}
}
function shouldDefineIsLockedProperty(annotation: Annotation): boolean {
const descriptor = Object.getOwnPropertyDescriptor(annotation, 'isLocked');
Iif (descriptor) {
return (
descriptor.configurable &&
(descriptor.set !== setIsLocked || descriptor.get !== getIsLocked)
);
}
return Object.isExtensible(annotation);
}
function setIsLocked(locked: boolean) {
setAnnotationLocked(this as Annotation, locked);
}
function getIsLocked() {
return isAnnotationLocked(this as Annotation);
}
/*
* Exports
*/
export {
setAnnotationLocked,
getAnnotationsLocked,
getAnnotationsLockedCount,
unlockAllAnnotations,
isAnnotationLocked,
checkAndDefineIsLockedProperty,
};
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