68 lines
2.2 KiB
TypeScript
68 lines
2.2 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2017 Aviral Dasgupta
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SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
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Please see LICENSE files in the repository root for full details.
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*/
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import { clamp } from "lodash";
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import { MatrixEvent } from "matrix-js-sdk/src/matrix";
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import { logger } from "matrix-js-sdk/src/logger";
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import { SerializedPart } from "./editor/parts";
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import EditorModel from "./editor/model";
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interface IHistoryItem {
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parts: SerializedPart[];
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replyEventId?: string;
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}
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export default class SendHistoryManager {
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public history: Array<IHistoryItem> = [];
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public prefix: string;
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public lastIndex = 0; // used for indexing the storage
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public currentIndex = 0; // used for indexing the loaded validated history Array
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public constructor(roomId: string, prefix: string) {
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this.prefix = prefix + roomId;
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// TODO: Performance issues?
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let index = 0;
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let itemJSON;
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while ((itemJSON = sessionStorage.getItem(`${this.prefix}[${index}]`))) {
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try {
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this.history.push(JSON.parse(itemJSON));
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} catch (e) {
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logger.warn("Throwing away unserialisable history", e);
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break;
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}
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++index;
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}
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this.lastIndex = this.history.length - 1;
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// reset currentIndex to account for any unserialisable history
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this.currentIndex = this.lastIndex + 1;
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}
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public static createItem(model: EditorModel, replyEvent?: MatrixEvent): IHistoryItem {
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return {
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parts: model.serializeParts(),
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replyEventId: replyEvent ? replyEvent.getId() : undefined,
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};
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}
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public save(editorModel: EditorModel, replyEvent?: MatrixEvent): void {
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const item = SendHistoryManager.createItem(editorModel, replyEvent);
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this.history.push(item);
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this.currentIndex = this.history.length;
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this.lastIndex += 1;
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sessionStorage.setItem(`${this.prefix}[${this.lastIndex}]`, JSON.stringify(item));
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}
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public getItem(offset: number): IHistoryItem {
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this.currentIndex = clamp(this.currentIndex + offset, 0, this.history.length - 1);
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return this.history[this.currentIndex];
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}
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}
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