ngx-infinite-scroll/esm2022/lib/services/scroll-state.mjs

[](https://travis-ci.org/orizens/ngx-infinite-scroll) [](#backers) [![Sponso

export class ScrollState {
    constructor(attrs) {
        this.lastScrollPosition = 0;
        this.lastTotalToScroll = 0;
        this.totalToScroll = 0;
        this.triggered = {
            down: 0,
            up: 0,
        };
        Object.assign(this, attrs);
    }
    updateScrollPosition(position) {
        return (this.lastScrollPosition = position);
    }
    updateTotalToScroll(totalToScroll) {
        if (this.lastTotalToScroll !== totalToScroll) {
            this.lastTotalToScroll = this.totalToScroll;
            this.totalToScroll = totalToScroll;
        }
    }
    updateScroll(scrolledUntilNow, totalToScroll) {
        this.updateScrollPosition(scrolledUntilNow);
        this.updateTotalToScroll(totalToScroll);
    }
    updateTriggeredFlag(scroll, isScrollingDown) {
        if (isScrollingDown) {
            this.triggered.down = scroll;
        }
        else {
            this.triggered.up = scroll;
        }
    }
    isTriggeredScroll(totalToScroll, isScrollingDown) {
        return isScrollingDown
            ? this.triggered.down === totalToScroll
            : this.triggered.up === totalToScroll;
    }
}
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