forked from mystiq/hydrogen-web
80 lines
2.5 KiB
JavaScript
80 lines
2.5 KiB
JavaScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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need better naming, but
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entry = event or gap from matrix layer
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tile = item on visual timeline like event, date separator?, group of joined events
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shall we put date separators as marker in EventViewItem or separate item? binary search will be complicated ...
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pagination ...
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on the timeline viewmodel (containing the TilesCollection?) we'll have a method to (un)load a tail or head of
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the timeline (counted in tiles), which results to a range in sortKeys we want on the screen. We pass that range
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to the room timeline, which unload entries from memory.
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when loading, it just reads events from a sortkey backwards or forwards...
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*/
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import {TilesCollection} from "./TilesCollection.js";
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import {ViewModel} from "../../../ViewModel.js";
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export class TimelineViewModel extends ViewModel {
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constructor(options) {
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super(options);
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const {timeline, tilesCreator} = options;
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this._timeline = this.track(timeline);
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this._tiles = new TilesCollection(timeline.entries, tilesCreator);
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}
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/**
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* @return {bool} startReached if the start of the timeline was reached
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*/
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async loadAtTop() {
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if (this.isDisposed) {
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// stop loading more, we switched room
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return true;
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}
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const firstTile = this._tiles.getFirst();
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if (firstTile?.shape === "gap") {
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return await firstTile.fill();
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} else {
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const topReached = await this._timeline.loadAtTop(10);
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return topReached;
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}
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}
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unloadAtTop(tileAmount) {
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// get lowerSortKey for tile at index tileAmount - 1
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// tell timeline to unload till there (included given key)
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}
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loadAtBottom() {
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}
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unloadAtBottom(tileAmount) {
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// get upperSortKey for tile at index tiles.length - tileAmount
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// tell timeline to unload till there (included given key)
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}
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get tiles() {
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return this._tiles;
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}
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}
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