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/*
* Copyright (c) 2016-2023 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,
combineLatest,
delay,
map,
of,
switchMap,
withLatestFrom
} from "rxjs"
import {
Viewport,
watchToggle
} from "~/browser"
/* ----------------------------------------------------------------------------
* Helper types
* ------------------------------------------------------------------------- */
/**
* Patch options
*/
interface PatchOptions {
viewport$: Observable<Viewport> /* Viewport observable */
tablet$: Observable<boolean> /* Media tablet observable */
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Patch the document body to lock when search is open
*
* For mobile and tablet viewports, the search is rendered full screen, which
* leads to scroll leaking when at the top or bottom of the search result. This
* function locks the body when the search is in full screen mode, and restores
* the scroll position when leaving.
*
* @param options - Options
*/
export function patchScrolllock(
{ viewport$, tablet$ }: PatchOptions
): void {
combineLatest([watchToggle("search"), tablet$])
.pipe(
map(([active, tablet]) => active && !tablet),
switchMap(active => of(active)
.pipe(
delay(active ? 400 : 100)
)
),
withLatestFrom(viewport$)
)
.subscribe(([active, { offset: { y }}]) => {
if (active) {
document.body.setAttribute("data-md-scrolllock", "")
document.body.style.top = `-${y}px`
} else {
const value = -1 * parseInt(document.body.style.top, 10)
document.body.removeAttribute("data-md-scrolllock")
document.body.style.top = ""
if (value)
window.scrollTo(0, value)
}
})
}
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