import { Injectable, Inject } from '@angular/core';
import { DOCUMENT } from '@angular/common';
import * as i0 from "@angular/core";
/**
 * Utility to handle the scrollbar.
 *
 * It allows to hide the scrollbar and compensate the lack of a vertical scrollbar
 * by adding an equivalent padding on the right of the body, and to revert this change.
 */
export class ScrollBar {
    constructor(_document) {
        this._document = _document;
    }
    /**
     * To be called to hide a potential vertical scrollbar:
     * - if a scrollbar is there and has a width greater than 0, adds some compensation
     * padding to the body to keep the same layout as when the scrollbar is there
     * - adds overflow: hidden
     *
     * @return a callback used to revert the change
     */
    hide() {
        const scrollbarWidth = Math.abs(window.innerWidth - this._document.documentElement.clientWidth);
        const body = this._document.body;
        const bodyStyle = body.style;
        const { overflow, paddingRight } = bodyStyle;
        if (scrollbarWidth > 0) {
            const actualPadding = parseFloat(window.getComputedStyle(body).paddingRight);
            bodyStyle.paddingRight = `${actualPadding + scrollbarWidth}px`;
        }
        bodyStyle.overflow = 'hidden';
        return () => {
            if (scrollbarWidth > 0) {
                bodyStyle.paddingRight = paddingRight;
            }
            bodyStyle.overflow = overflow;
        };
    }
}
ScrollBar.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.2.6", ngImport: i0, type: ScrollBar, deps: [{ token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable });
ScrollBar.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.2.6", ngImport: i0, type: ScrollBar, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.2.6", ngImport: i0, type: ScrollBar, decorators: [{
            type: Injectable,
            args: [{ providedIn: 'root' }]
        }], ctorParameters: function () { return [{ type: undefined, decorators: [{
                    type: Inject,
                    args: [DOCUMENT]
                }] }]; } });
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