forked from mystiq/hydrogen-web
78 lines
2.3 KiB
JavaScript
78 lines
2.3 KiB
JavaScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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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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import {BaseObservableList} from "./BaseObservableList.js";
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import {findAndUpdateInArray} from "./common.js";
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export class BaseMappedList extends BaseObservableList {
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constructor(sourceList, mapper, updater, removeCallback) {
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super();
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this._sourceList = sourceList;
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this._mapper = mapper;
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this._updater = updater;
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this._removeCallback = removeCallback;
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this._mappedValues = null;
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this._sourceUnsubscribe = null;
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}
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findAndUpdate(predicate, updater) {
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return findAndUpdateInArray(predicate, this._mappedValues, this, updater);
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}
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get length() {
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return this._mappedValues.length;
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}
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[Symbol.iterator]() {
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return this._mappedValues.values();
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}
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}
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export function runAdd(list, index, mappedValue) {
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list._mappedValues.splice(index, 0, mappedValue);
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list.emitAdd(index, mappedValue);
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}
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export function runUpdate(list, index, value, params) {
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const mappedValue = list._mappedValues[index];
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if (list._updater) {
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list._updater(mappedValue, params, value);
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}
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list.emitUpdate(index, mappedValue, params);
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}
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export function runRemove(list, index) {
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const mappedValue = list._mappedValues[index];
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list._mappedValues.splice(index, 1);
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if (list._removeCallback) {
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list._removeCallback(mappedValue);
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}
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list.emitRemove(index, mappedValue);
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}
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export function runMove(list, fromIdx, toIdx) {
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const mappedValue = list._mappedValues[fromIdx];
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list._mappedValues.splice(fromIdx, 1);
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list._mappedValues.splice(toIdx, 0, mappedValue);
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list.emitMove(fromIdx, toIdx, mappedValue);
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}
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export function runReset(list) {
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list._mappedValues = [];
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list.emitReset();
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}
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