ng-mat-select-infinite-scroll/esm2020/lib/infinite-scroll.service.mjs

Adds missing infinite scroll functionality for the angular material select component

import { Injectable } from '@angular/core';
import { fromEvent, Subject } from 'rxjs';
import { debounceTime, takeUntil, tap } from 'rxjs/operators';
import * as i0 from "@angular/core";
export class InfiniteScrollService {
    constructor(ngZone) {
        this.ngZone = ngZone;
        this.threshold = '15%';
        this.debounceTime = 150;
        this.thrPx = 0;
        this.thrPc = 0;
        this.destroyed$ = new Subject();
    }
    initialize(panel, selectItemHeightPx, config) {
        this.threshold = config.threshold;
        this.debounceTime = config.debounceTime;
        this.complete = config.complete;
        this.panel = panel;
        this.selectItemHeightPx = selectItemHeightPx;
        this.evaluateThreshold();
    }
    evaluateThreshold() {
        if (this.threshold.lastIndexOf('%') > -1) {
            this.thrPx = 0;
            this.thrPc = (parseFloat(this.threshold) / 100);
        }
        else {
            this.thrPx = parseFloat(this.threshold);
            this.thrPc = 0;
        }
    }
    registerScrollListener(infiniteScrollCallback) {
        fromEvent(this.panel, 'scroll').pipe(takeUntil(this.destroyed$), debounceTime(this.debounceTime), tap((event) => {
            this.handleScrollEvent(event, infiniteScrollCallback);
        })).subscribe();
    }
    handleScrollEvent(event, infiniteScrollCallback) {
        if (this.complete || !event.target) {
            return;
        }
        this.ngZone.runOutsideAngular(() => {
            const countOfRenderedOptions = Math.round(this.panel.scrollHeight / this.selectItemHeightPx);
            const infiniteScrollDistance = this.selectItemHeightPx * countOfRenderedOptions;
            const threshold = this.thrPc !== 0 ? (infiniteScrollDistance * this.thrPc) : this.thrPx;
            const scrolledDistance = this.panel.clientHeight + event.target.scrollTop;
            if ((scrolledDistance + threshold) >= infiniteScrollDistance) {
                this.ngZone.run(infiniteScrollCallback);
            }
        });
    }
    destroy() {
        this.destroyed$.next();
        this.destroyed$.complete();
    }
}
InfiniteScrollService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: InfiniteScrollService, deps: [{ token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Injectable });
InfiniteScrollService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: InfiniteScrollService, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: InfiniteScrollService, decorators: [{
            type: Injectable,
            args: [{
                    providedIn: 'root'
                }]
        }], ctorParameters: function () { return [{ type: i0.NgZone }]; } });
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