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| /* | |
| * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com> | |
| * | |
| * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| * of this software and associated documentation files (the "Software"), to | |
| * deal in the Software without restriction, including without limitation the | |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
| * sell copies of the Software, and to permit persons to whom the Software is | |
| * furnished to do so, subject to the following conditions: | |
| * | |
| * The above copyright notice and this permission notice shall be included in | |
| * all copies or substantial portions of the Software. | |
| * | |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE | |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
| * IN THE SOFTWARE. | |
| */ | |
| import { | |
| MonoTypeOperatorFunction, | |
| Observable, | |
| animationFrameScheduler, | |
| pipe | |
| } from "rxjs" | |
| import { | |
| finalize, | |
| map, | |
| mapTo, | |
| observeOn, | |
| scan, | |
| switchMap, | |
| withLatestFrom | |
| } from "rxjs/operators" | |
| import { getElementOrThrow } from "browser" | |
| import { SearchResult } from "integrations/search" | |
| import { renderSearchResult } from "templates" | |
| import { SearchQuery } from "../../query" | |
| import { | |
| addToSearchResultList, | |
| resetSearchResultList, | |
| resetSearchResultMeta, | |
| setSearchResultMeta | |
| } from "../set" | |
| /* ---------------------------------------------------------------------------- | |
| * Helper types | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Apply options | |
| */ | |
| interface ApplyOptions { | |
| query$: Observable<SearchQuery> /* Search query observable */ | |
| ready$: Observable<boolean> /* Search ready observable */ | |
| fetch$: Observable<boolean> /* Result fetch observable */ | |
| } | |
| /* ---------------------------------------------------------------------------- | |
| * Functions | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Apply search results | |
| * | |
| * This function will perform a lazy rendering of the search results, depending | |
| * on the vertical offset of the search result container. When the scroll offset | |
| * reaches the bottom of the element, more results are fetched and rendered. | |
| * | |
| * @param el - Search result element | |
| * @param options - Options | |
| * | |
| * @return Operator function | |
| */ | |
| export function applySearchResult( | |
| el: HTMLElement, { query$, ready$, fetch$ }: ApplyOptions | |
| ): MonoTypeOperatorFunction<SearchResult[]> { | |
| const list = getElementOrThrow(".md-search-result__list", el) | |
| const meta = getElementOrThrow(".md-search-result__meta", el) | |
| return pipe( | |
| /* Apply search result metadata */ | |
| withLatestFrom(query$, ready$), | |
| map(([result, query]) => { | |
| if (query.value) { | |
| setSearchResultMeta(meta, result.length) | |
| } else { | |
| resetSearchResultMeta(meta) | |
| } | |
| return result | |
| }), | |
| /* Apply search result list */ | |
| switchMap(result => { | |
| const thresholds = [...result.map(([best]) => best.score), 0] | |
| return fetch$ | |
| .pipe( | |
| /* Defer repaint to next animation frame */ | |
| observeOn(animationFrameScheduler), | |
| scan(index => { | |
| const container = el.parentElement! | |
| while (index < result.length) { | |
| addToSearchResultList(list, renderSearchResult( | |
| result[index++], thresholds[index] | |
| )) | |
| if (container.scrollHeight - container.offsetHeight > 16) | |
| break | |
| } | |
| return index | |
| }, 0), | |
| /* Re-map to search result */ | |
| mapTo(result), | |
| /* Reset on complete or error */ | |
| finalize(() => { | |
| resetSearchResultList(list) | |
| }) | |
| ) | |
| } | |
| ) | |
| ) | |
| } |