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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 { Observable, OperatorFunction, pipe } from "rxjs" | |
| import { | |
| distinctUntilChanged, | |
| filter, | |
| map, | |
| mapTo, | |
| startWith, | |
| switchMap | |
| } from "rxjs/operators" | |
| import { WorkerHandler, watchElementOffset } from "browser" | |
| import { | |
| SearchMessage, | |
| SearchResult, | |
| isSearchReadyMessage, | |
| isSearchResultMessage | |
| } from "integrations" | |
| import { SearchQuery } from "../../query" | |
| import { applySearchResult } from "../react" | |
| /* ---------------------------------------------------------------------------- | |
| * Helper types | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Mount options | |
| */ | |
| interface MountOptions { | |
| query$: Observable<SearchQuery> /* Search query observable */ | |
| } | |
| /* ---------------------------------------------------------------------------- | |
| * Functions | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Mount search result from source observable | |
| * | |
| * @param handler - Worker handler | |
| * @param options - Options | |
| * | |
| * @return Operator function | |
| */ | |
| export function mountSearchResult( | |
| { rx$ }: WorkerHandler<SearchMessage>, { query$ }: MountOptions | |
| ): OperatorFunction<HTMLElement, SearchResult[]> { | |
| return pipe( | |
| switchMap(el => { | |
| const container = el.parentElement! | |
| /* Compute if search is ready */ | |
| const ready$ = rx$ | |
| .pipe( | |
| filter(isSearchReadyMessage), | |
| mapTo(true) | |
| ) | |
| /* Compute whether there are more search results to fetch */ | |
| const fetch$ = watchElementOffset(container) | |
| .pipe( | |
| map(({ y }) => { | |
| return y >= container.scrollHeight - container.offsetHeight - 16 | |
| }), | |
| distinctUntilChanged(), | |
| filter(Boolean) | |
| ) | |
| /* Apply search results */ | |
| return rx$ | |
| .pipe( | |
| filter(isSearchResultMessage), | |
| map(({ data }) => data), | |
| applySearchResult(el, { query$, ready$, fetch$ }), | |
| startWith([]) | |
| ) | |
| }) | |
| ) | |
| } |