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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,
distinctUntilKeyChanged,
map
} from "rxjs"
import { Header } from "~/components"
import { getElementOffset } from "../../element"
import { Viewport } from "../_"
/* ----------------------------------------------------------------------------
* Helper types
* ------------------------------------------------------------------------- */
/**
* Watch options
*/
interface WatchOptions {
viewport$: Observable<Viewport> /* Viewport observable */
header$: Observable<Header> /* Header observable */
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Watch viewport relative to element
*
* @param el - Element
* @param options - Options
*
* @returns Viewport observable
*/
export function watchViewportAt(
el: HTMLElement, { viewport$, header$ }: WatchOptions
): Observable<Viewport> {
const size$ = viewport$
.pipe(
distinctUntilKeyChanged("size")
)
/* Compute element offset */
const offset$ = combineLatest([size$, header$])
.pipe(
map(() => getElementOffset(el))
)
/* Compute relative viewport, return hot observable */
return combineLatest([header$, viewport$, offset$])
.pipe(
map(([{ height }, { offset, size }, { x, y }]) => ({
offset: {
x: offset.x - x,
y: offset.y - y + height
},
size
}))
)
}
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