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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, | |
| of, | |
| pipe | |
| } from "rxjs" | |
| import { | |
| distinctUntilChanged, | |
| finalize, | |
| map, | |
| observeOn, | |
| shareReplay, | |
| switchMap, | |
| tap | |
| } from "rxjs/operators" | |
| import { watchElementSize } from "browser" | |
| import { Header, HeaderType } from "../_" | |
| import { | |
| resetHeaderTitleActive, | |
| setHeaderTitleActive | |
| } from "../set" | |
| /* ---------------------------------------------------------------------------- | |
| * Helper types | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Watch options | |
| */ | |
| interface WatchOptions { | |
| document$: Observable<Document> /* Document observable */ | |
| } | |
| /* ---------------------------------------------------------------------------- | |
| * Functions | |
| * ------------------------------------------------------------------------- */ | |
| /** | |
| * Watch header | |
| * | |
| * @param el - Header element | |
| * | |
| * @return Header observable | |
| */ | |
| export function watchHeader( | |
| el: HTMLElement, { document$ }: WatchOptions | |
| ): Observable<Omit<Header, "type">> { | |
| return document$ | |
| .pipe( | |
| map(() => { | |
| const styles = getComputedStyle(el) | |
| return [ | |
| "sticky", /* Modern browsers */ | |
| "-webkit-sticky" /* Safari */ | |
| ].includes(styles.position) | |
| }), | |
| distinctUntilChanged(), | |
| switchMap(sticky => { | |
| if (sticky) { | |
| return watchElementSize(el) | |
| .pipe( | |
| map(({ height }) => ({ | |
| sticky: true, | |
| height | |
| })) | |
| ) | |
| } else { | |
| return of({ | |
| sticky: false, | |
| height: 0 | |
| }) | |
| } | |
| }), | |
| shareReplay({ bufferSize: 1, refCount: true }) | |
| ) | |
| } | |
| /* ------------------------------------------------------------------------- */ | |
| /** | |
| * Apply header title type | |
| * | |
| * @param el - Header title element | |
| * | |
| * @return Operator function | |
| */ | |
| export function applyHeaderType( | |
| el: HTMLElement | |
| ): MonoTypeOperatorFunction<HeaderType> { | |
| return pipe( | |
| /* Defer repaint to next animation frame */ | |
| observeOn(animationFrameScheduler), | |
| tap(type => { | |
| setHeaderTitleActive(el, type === "page") | |
| }), | |
| /* Reset on complete or error */ | |
| finalize(() => { | |
| resetHeaderTitleActive(el) | |
| }) | |
| ) | |
| } |