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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, | |
| Subject, | |
| noop, | |
| pipe | |
| } from "rxjs" | |
| import { | |
| distinctUntilKeyChanged, | |
| finalize, | |
| switchMap, | |
| tap | |
| } from "rxjs/operators" | |
| import { Viewport } from "browser" | |
| import { useComponent } from "../../_" | |
| import { Header } from "../../header" | |
| import { | |
| applyHeaderShadow, | |
| watchMain | |
| } from "../react" | |
| /* ---------------------------------------------------------------------------- | |
| * Types | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Main area | |
| */ | |
| export interface Main { | |
| offset: number /* Main area top offset */ | |
| height: number /* Main area visible height */ | |
| active: boolean /* Scrolled past top offset */ | |
| } | |
| /* ---------------------------------------------------------------------------- | |
| * Helper types | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Mount options | |
| */ | |
| interface MountOptions { | |
| header$: Observable<Header> /* Header observable */ | |
| viewport$: Observable<Viewport> /* Viewport observable */ | |
| } | |
| /* ---------------------------------------------------------------------------- | |
| * Functions | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Mount main area from source observable | |
| * | |
| * The header must be connected to the main area observable outside of the | |
| * operator function, as the header will persist in-between document switches | |
| * while the main area is replaced. However, the header observable must be | |
| * passed to this function, so we connect both via a long-living subject. | |
| * | |
| * @param options - Options | |
| * | |
| * @return Operator function | |
| */ | |
| export function mountMain( | |
| { header$, viewport$ }: MountOptions | |
| ): OperatorFunction<HTMLElement, Main> { | |
| const main$ = new Subject<Main>() | |
| /* Connect to main area observable via long-living subject */ | |
| useComponent("header") | |
| .pipe( | |
| switchMap(header => main$ | |
| .pipe( | |
| distinctUntilKeyChanged("active"), | |
| applyHeaderShadow(header) | |
| ) | |
| ) | |
| ) | |
| .subscribe(noop) | |
| /* Return operator */ | |
| return pipe( | |
| switchMap(el => watchMain(el, { header$, viewport$ })), | |
| tap(main => main$.next(main)), | |
| finalize(() => main$.complete()) | |
| ) | |
| } |