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realtomaszkula/ng-reactive-sticky-header#direction-stream.ts

Last active June 18, 2018 12:49
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ng-reactive-sticky-header#direction-stream.ts
enum Direction {
Up = 'Up',
Down = 'Down'
}
const scroll$ = fromEvent(window, 'scroll').pipe(
throttleTime(10),
map(() => window.pageYOffset),
pairwise(),
map(([y1, y2]): Direction => (y2 < y1 ? Direction.Up : Direction.Down)),
);
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