matrix-react-sdk/lib/stores/RoomScrollStateStore.js

SDK for matrix.org using React

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = exports.RoomScrollStateStore = void 0;
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
/*
Copyright 2017-2024 New Vector Ltd.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

/**
 * Stores where the user has scrolled to in each room
 */
class RoomScrollStateStore {
  constructor() {
    // A map from room id to scroll state.
    //
    // If there is no special scroll state (ie, we are following the live
    // timeline), the scroll state is null. Otherwise, it is an object with
    // the following properties:
    //
    //    focussedEvent: the ID of the 'focussed' event. Typically this is
    //        the last event fully visible in the viewport, though if we
    //        have done an explicit scroll to an explicit event, it will be
    //        that event.
    //
    //    pixelOffset: the number of pixels the window is scrolled down
    //        from the focussedEvent.
    (0, _defineProperty2.default)(this, "scrollStateMap", new Map());
  }
  getScrollState(roomId) {
    return this.scrollStateMap.get(roomId);
  }
  setScrollState(roomId, scrollState) {
    if (scrollState === null) {
      this.scrollStateMap.delete(roomId);
    } else {
      this.scrollStateMap.set(roomId, scrollState);
    }
  }
}
exports.RoomScrollStateStore = RoomScrollStateStore;
if (window.mxRoomScrollStateStore === undefined) {
  window.mxRoomScrollStateStore = new RoomScrollStateStore();
}
var _default = exports.default = window.mxRoomScrollStateStore;
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