David LangleyandGitHub
491f0cd08a
* Copyright headers 1 * Licence headers 2 * Copyright Headers 3 * Copyright Headers 4 * Copyright Headers 5 * Copyright Headers 6 * Copyright headers 7 * Add copyright headers for html and config file * Replace license files and update package.json * Update with CLA * lint
49 lines
1.5 KiB
TypeScript
49 lines
1.5 KiB
TypeScript
/*
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Copyright 2017-2024 New Vector Ltd.
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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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export interface ScrollState {
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focussedEvent?: string;
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pixelOffset?: number;
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}
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/**
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* Stores where the user has scrolled to in each room
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*/
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export class RoomScrollStateStore {
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// A map from room id to scroll state.
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//
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// If there is no special scroll state (ie, we are following the live
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// timeline), the scroll state is null. Otherwise, it is an object with
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// the following properties:
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//
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// focussedEvent: the ID of the 'focussed' event. Typically this is
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// the last event fully visible in the viewport, though if we
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// have done an explicit scroll to an explicit event, it will be
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// that event.
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//
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// pixelOffset: the number of pixels the window is scrolled down
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// from the focussedEvent.
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private scrollStateMap = new Map<string, ScrollState>();
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public getScrollState(roomId: string): ScrollState | undefined {
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return this.scrollStateMap.get(roomId);
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}
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public setScrollState(roomId: string, scrollState: ScrollState | null): void {
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if (scrollState === null) {
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this.scrollStateMap.delete(roomId);
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} else {
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this.scrollStateMap.set(roomId, scrollState);
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}
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}
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}
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if (window.mxRoomScrollStateStore === undefined) {
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window.mxRoomScrollStateStore = new RoomScrollStateStore();
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}
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export default window.mxRoomScrollStateStore!;
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