forked from mystiq/hydrogen-web
86 lines
3 KiB
TypeScript
86 lines
3 KiB
TypeScript
/*
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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";
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import {findAndUpdateInArray} from "./common";
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export type Mapper<F,T> = (value: F) => T
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export type Updater<F,T> = (mappedValue: T, params: any, value: F) => void;
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export class BaseMappedList<F,T,R = T> extends BaseObservableList<T> {
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protected _sourceList: BaseObservableList<F>;
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protected _sourceUnsubscribe: (() => void) | null = null;
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_mapper: Mapper<F,R>;
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_updater?: Updater<F,T>;
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_removeCallback?: (value: T) => void;
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_mappedValues: T[] | null = null;
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constructor(sourceList: BaseObservableList<F>, mapper: Mapper<F,R>, updater?: Updater<F,T>, removeCallback?: (value: T) => void) {
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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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}
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findAndUpdate(predicate: (value: T) => boolean, updater: (value: T) => any | false) {
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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<F,T,R>(list: BaseMappedList<F,T,R>, index: number, mappedValue: T): void {
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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<F,T,R>(list: BaseMappedList<F,T,R>, index: number, value: F, params: any): void {
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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<F,T,R>(list: BaseMappedList<F,T,R>, index: number): void {
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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<F,T,R>(list: BaseMappedList<F,T,R>, fromIdx: number, toIdx: number): void {
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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<F,T,R>(list: BaseMappedList<F,T,R>): void {
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list._mappedValues = [];
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list.emitReset();
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}
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