forked from mystiq/hydrogen-web
74 lines
2.4 KiB
TypeScript
74 lines
2.4 KiB
TypeScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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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 {BaseObservable} from "../BaseObservable";
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export interface IListObserver<T> {
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onReset(list: BaseObservableList<T>): void;
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onAdd(index: number, value:T, list: BaseObservableList<T>): void;
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onUpdate(index: number, value: T, params: any, list: BaseObservableList<T>): void;
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onRemove(index: number, value: T, list: BaseObservableList<T>): void
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onMove(from: number, to: number, value: T, list: BaseObservableList<T>): void
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}
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export function defaultObserverWith<T>(overrides: { [key in keyof IListObserver<T>]?: IListObserver<T>[key] }): IListObserver<T> {
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const defaults = {
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onReset(){},
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onAdd(){},
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onUpdate(){},
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onRemove(){},
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onMove(){},
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}
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return Object.assign(defaults, overrides);
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}
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export abstract class BaseObservableList<T> extends BaseObservable<IListObserver<T>> implements Iterable<T> {
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emitReset() {
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for(let h of this._handlers) {
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h.onReset(this);
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}
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}
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// we need batch events, mostly on index based collection though?
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// maybe we should get started without?
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emitAdd(index: number, value: T): void {
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for(let h of this._handlers) {
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h.onAdd(index, value, this);
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}
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}
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emitUpdate(index: number, value: T, params?: any): void {
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for(let h of this._handlers) {
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h.onUpdate(index, value, params, this);
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}
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}
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emitRemove(index: number, value: T): void {
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for(let h of this._handlers) {
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h.onRemove(index, value, this);
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}
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}
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// toIdx assumes the item has already
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// been removed from its fromIdx
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emitMove(fromIdx: number, toIdx: number, value: T): void {
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for(let h of this._handlers) {
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h.onMove(fromIdx, toIdx, value, this);
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}
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}
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abstract [Symbol.iterator](): Iterator<T>;
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abstract get length(): number;
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}
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