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https://github.com/vector-im/hydrogen-web.git
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83 lines
2.0 KiB
JavaScript
83 lines
2.0 KiB
JavaScript
/*
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Copyright 2021 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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export class ListObserver {
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constructor() {
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this._queuesPerType = new Map();
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}
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_nextEvent(type) {
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const queue = this._queuesPerType.get(type);
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if (!queue) {
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queue = [];
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this._queuesPerType.set(type, queue);
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}
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return new Promise(resolve => {
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queue.push(resolve);
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});
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}
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nextAdd() {
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return this._nextEvent("add");
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}
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nextUpdate() {
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return this._nextEvent("update");
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}
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nextRemove() {
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return this._nextEvent("remove");
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}
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nextMove() {
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return this._nextEvent("move");
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}
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nextReset() {
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return this._nextEvent("reset");
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}
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_popQueue(type) {
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const queue = this._queuesPerType.get(type);
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return queue?.unshift();
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}
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onReset(list) {
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const resolve = this._popQueue("reset");
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resolve && resolve();
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}
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onAdd(index, value) {
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const resolve = this._popQueue("add");
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resolve && resolve({index, value});
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}
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onUpdate(index, value, params) {
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const resolve = this._popQueue("update");
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resolve && resolve({index, value, params});
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}
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onRemove(index, value) {
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const resolve = this._popQueue("remove");
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resolve && resolve({index, value});
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}
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onMove(fromIdx, toIdx, value) {
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const resolve = this._popQueue("move");
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resolve && resolve({fromIdx, toIdx, value});
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}
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}
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