cocori-ng/esm2020/feature-core/service/scroll.service.mjs

Cocori-ng is an Angular full of great components & utilites based on Material

import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';
import * as i0 from "@angular/core";
export class ScrollService {
    constructor() {
        this.onScroll = new Subject();
    }
    currentScrollPosition() {
        // Firefox, Chrome, Opera, Safari
        if (self.pageYOffset)
            return self.pageYOffset;
        // Internet Explorer 6 - standards mode
        if (document.documentElement && document.documentElement.scrollTop) {
            return document.documentElement.scrollTop;
        }
        // Internet Explorer 6, 7 and 8
        if (document.body.scrollTop)
            return document.body.scrollTop;
        return 0;
    }
    getElementDomPosition(elm) {
        let y = elm.offsetTop - 100;
        let node = elm;
        while (node.offsetParent && node.offsetParent !== document.body) {
            node = node.offsetParent;
            y += node.offsetTop;
        }
        return y;
    }
    scrollToTop() {
        const that = this;
        let timeOut;
        if (document.body.scrollTop !== 0 || document.documentElement.scrollTop !== 0) {
            window.scrollBy(0, -50);
            timeOut = setTimeout(function () {
                that.scrollToTop();
            }, 10);
        }
        else {
            clearTimeout(timeOut);
        }
    }
    scrollToIdSmooth(eID) {
        const startY = this.currentScrollPosition();
        const elm = document.getElementById(eID);
        const stopY = this.getElementDomPosition(elm);
        const distance = stopY > startY ? stopY - startY : startY - stopY;
        if (distance < 100) {
            scrollTo(0, stopY);
            return;
        }
        let speed = Math.round(distance / 100);
        if (speed >= 20) {
            speed = 20;
        }
        const step = Math.round(distance / 25);
        let leapY = stopY > startY ? startY + step : startY - step;
        let timer = 0;
        if (stopY > startY) {
            for (let i = startY; i < stopY; i += step) {
                setTimeout("window.scrollTo(0, " + leapY + ")", timer * speed);
                leapY += step;
                if (leapY > stopY)
                    leapY = stopY;
                timer++;
            }
            return;
        }
        for (let i = startY; i > stopY; i -= step) {
            setTimeout("window.scrollTo(0, " + leapY + ")", timer * speed);
            leapY -= step;
            if (leapY < stopY)
                leapY = stopY;
            timer++;
        }
        return false;
    }
    getScrollDistanceTo(eID) {
        const elm = document.getElementById(eID);
        if (!elm)
            return -1; // element not found
        const stopY = this.getElementDomPosition(elm);
        return stopY;
    }
}
ScrollService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.1.1", ngImport: i0, type: ScrollService, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
ScrollService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.1.1", ngImport: i0, type: ScrollService, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.1.1", ngImport: i0, type: ScrollService, decorators: [{
            type: Injectable,
            args: [{
                    providedIn: 'root'
                }]
        }], ctorParameters: function () { return []; } });
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