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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)
})
)
}