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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())
)
}