58 lines
1.3 KiB
TypeScript
58 lines
1.3 KiB
TypeScript
import {
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ExcalidrawElement,
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NonDeletedExcalidrawElement,
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} from "../element/types";
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import { getNonDeletedElements } from "../element";
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export interface SceneStateCallback {
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(): void;
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}
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export interface SceneStateCallbackRemover {
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(): void;
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}
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class GlobalScene {
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private nonDeletedElements: readonly NonDeletedExcalidrawElement[] = [];
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private callbacks: Set<SceneStateCallback> = new Set();
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constructor(private _elements: readonly ExcalidrawElement[] = []) {}
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getElementsIncludingDeleted() {
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return this._elements;
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}
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getElements(): readonly NonDeletedExcalidrawElement[] {
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return this.nonDeletedElements;
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}
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replaceAllElements(nextElements: readonly ExcalidrawElement[]) {
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this._elements = nextElements;
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this.nonDeletedElements = getNonDeletedElements(this._elements);
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this.informMutation();
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}
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informMutation() {
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for (const callback of Array.from(this.callbacks)) {
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callback();
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}
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}
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addCallback(cb: SceneStateCallback): SceneStateCallbackRemover {
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if (this.callbacks.has(cb)) {
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throw new Error();
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}
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this.callbacks.add(cb);
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return () => {
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if (!this.callbacks.has(cb)) {
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throw new Error();
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}
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this.callbacks.delete(cb);
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};
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}
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}
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export const globalSceneState = new GlobalScene();
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