forked from EVOgeek/Vmeda.Online
102 lines
2.4 KiB
TypeScript
102 lines
2.4 KiB
TypeScript
// (C) Copyright 2015 Moodle Pty Ltd.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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import { CoreItemsManagerSource } from './items-manager-source';
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/**
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* Items collection source data for "swipe slides".
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*/
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export abstract class CoreSwipeSlidesItemsManagerSource<Item = unknown> extends CoreItemsManagerSource<Item> {
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protected initialItem?: Item;
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constructor(initialItem?: Item) {
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super();
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this.initialItem = initialItem;
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}
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/**
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* @inheritdoc
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*/
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async load(): Promise<void> {
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const items = await this.loadItems();
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this.setItems(items);
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}
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/**
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* Load items.
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*
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* @returns Items list.
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*/
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protected abstract loadItems(): Promise<Item[]>;
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/**
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* Get a certain item.
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*
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* @param id Item ID.
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* @returns Item, null if not found.
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*/
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getItem(id: string | number): Item | null {
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const index = this.getItemIndexById(id);
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return this.items?.[index] ?? null;
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}
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/**
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* Get a certain item index.
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*
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* @param item Item.
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* @returns Item index, -1 if not found.
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*/
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getItemIndex(item: Item): number {
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return this.getItemIndexById(this.getItemId(item));
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}
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/**
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* Get a certain item index.
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*
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* @param id Item ID.
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* @returns Item index, -1 if not found.
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*/
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getItemIndexById(id: string | number): number {
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const index = this.items?.findIndex((listItem) => id === this.getItemId(listItem));
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return index ?? -1;
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}
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/**
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* Get initial item index.
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*
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* @returns Initial item index.
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*/
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getInitialItemIndex(): number {
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if (!this.initialItem) {
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return 0;
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}
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return this.getItemIndex(this.initialItem);
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}
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/**
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* Get the ID of an item.
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*
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* @param item Item.
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* @returns Item ID.
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*/
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abstract getItemId(item: Item): string | number;
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}
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