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import { getAnnotation } from './annotationState';
import { Events } from '../../enums';
import { Annotation } from '../../types';
import { AnnotationVisibilityChangeEventDetail } from '../../types/EventTypes';
import {
isAnnotationSelected,
deselectAnnotation,
} from './annotationSelection';
/*
* It stores all hidden annotation uids.
*/
const globalHiddenAnnotationUIDsSet: Set<string> = new Set();
/*
* Interface (Public API)
*/
/**
* Set the "visible" state of a given annotation instance.
*
* @event ANNOTATION_VISIBILITY_CHANGE
*
* @param annotationUID - The annotation uid which will have
* its visible state changed. An event will only be triggered if the visible state
* of the given annotation instance changed.
* @param visible - A boolean value indicating if the instance should
* be visible (true) or not (false)
*/
function setAnnotationVisibility(annotationUID: string, visible = true): void {
const detail = makeEventDetail();
if (annotationUID) {
Eif (visible) {
show(annotationUID, globalHiddenAnnotationUIDsSet, detail);
} else {
hide(annotationUID, globalHiddenAnnotationUIDsSet, detail);
}
}
publish(detail);
}
/**
* Clears all the hidden annotations.
*
*/
function showAllAnnotations(): void {
const detail = makeEventDetail();
globalHiddenAnnotationUIDsSet.forEach((annotationUID) => {
show(annotationUID, globalHiddenAnnotationUIDsSet, detail);
});
publish(detail);
}
/**
* Given an annotation UID, return true if it is visible, false if hidden and undefined if does not exist.
* @param annotationUID - The annotation uid to tell if is visible or not.
* @returns A boolean value or value if does not exist.
*/
function isAnnotationVisible(annotationUID: string): boolean | undefined {
const annotation = getAnnotation(annotationUID);
Eif (annotation) {
return !globalHiddenAnnotationUIDsSet.has(annotationUID);
}
}
/**
* It decorates given annotation with isVisible property.
* It properly initializes the isVisible on annotation(the property will be create if does not exist yet)
*
* @param annotation - The annotation object to be checked.
*/
function checkAndDefineIsVisibleProperty(annotation: Annotation): void {
Eif (annotation) {
const isVisible = annotation.isVisible ?? true;
Eif (shouldDefineIsVisibleProperty(annotation)) {
Object.defineProperty(annotation, 'isVisible', {
configurable: false,
enumerable: true,
set: setIsVisible,
get: getIsVisible,
});
}
setAnnotationVisibility(annotation.annotationUID, isVisible);
}
}
/*
* Private Helpers
*/
function makeEventDetail(): AnnotationVisibilityChangeEventDetail {
return Object.freeze({
lastVisible: [],
lastHidden: [],
hidden: [],
});
}
function show(
annotationUID: string,
annotationUIDsSet: Set<string>,
detail: AnnotationVisibilityChangeEventDetail
): void {
Iif (annotationUIDsSet.delete(annotationUID)) {
detail.lastVisible.push(annotationUID);
}
}
function hide(
annotationUID: string,
annotationUIDsSet: Set<string>,
detail: AnnotationVisibilityChangeEventDetail
): void {
if (!annotationUIDsSet.has(annotationUID)) {
annotationUIDsSet.add(annotationUID);
if (isAnnotationSelected(annotationUID)) {
deselectAnnotation(annotationUID);
}
detail.lastHidden.push(annotationUID);
}
}
function publish(detail: AnnotationVisibilityChangeEventDetail) {
Iif (detail.lastHidden.length > 0 || detail.lastVisible.length > 0) {
globalHiddenAnnotationUIDsSet.forEach(
(item) => void detail.hidden.push(item)
);
triggerEvent(eventTarget, Events.ANNOTATION_VISIBILITY_CHANGE, detail);
}
}
function shouldDefineIsVisibleProperty(annotation: Annotation): boolean {
const descriptor = Object.getOwnPropertyDescriptor(annotation, 'isVisible');
Iif (descriptor) {
return (
descriptor.configurable &&
(descriptor.set !== setIsVisible || descriptor.get !== getIsVisible)
);
}
return Object.isExtensible(annotation);
}
function setIsVisible(hidden: boolean) {
setAnnotationVisibility((this as Annotation).annotationUID, hidden);
}
function getIsVisible() {
return isAnnotationVisible((this as Annotation).annotationUID);
}
export {
setAnnotationVisibility,
showAllAnnotations,
isAnnotationVisible,
checkAndDefineIsVisibleProperty,
};
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