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/**
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* --------------------------------------------------------------------------
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* Bootstrap util/scrollBar.js
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* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
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* --------------------------------------------------------------------------
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*/
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import Manipulator from '../dom/manipulator'
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import SelectorEngine from '../dom/selector-engine'
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import { isElement } from './index'
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/**
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* Constants
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*/
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const SELECTOR_FIXED_CONTENT = '.fixed-top, .fixed-bottom, .is-fixed, .sticky-top'
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const SELECTOR_STICKY_CONTENT = '.sticky-top'
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const PROPERTY_PADDING = 'padding-right'
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const PROPERTY_MARGIN = 'margin-right'
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/**
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* Class definition
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*/
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class ScrollBarHelper {
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constructor() {
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this._element = document.body
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}
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// Public
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getWidth() {
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// https://developer.mozilla.org/en-US/docs/Web/API/Window/innerWidth#usage_notes
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const documentWidth = document.documentElement.clientWidth
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return Math.abs(window.innerWidth - documentWidth)
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}
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hide() {
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const width = this.getWidth()
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this._disableOverFlow()
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// give padding to element to balance the hidden scrollbar width
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this._setElementAttributes(this._element, PROPERTY_PADDING, calculatedValue => calculatedValue + width)
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// trick: We adjust positive paddingRight and negative marginRight to sticky-top elements to keep showing fullwidth
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this._setElementAttributes(SELECTOR_FIXED_CONTENT, PROPERTY_PADDING, calculatedValue => calculatedValue + width)
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this._setElementAttributes(SELECTOR_STICKY_CONTENT, PROPERTY_MARGIN, calculatedValue => calculatedValue - width)
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}
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reset() {
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this._resetElementAttributes(this._element, 'overflow')
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this._resetElementAttributes(this._element, PROPERTY_PADDING)
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this._resetElementAttributes(SELECTOR_FIXED_CONTENT, PROPERTY_PADDING)
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this._resetElementAttributes(SELECTOR_STICKY_CONTENT, PROPERTY_MARGIN)
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}
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isOverflowing() {
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return this.getWidth() > 0
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}
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// Private
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_disableOverFlow() {
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this._saveInitialAttribute(this._element, 'overflow')
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this._element.style.overflow = 'hidden'
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}
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_setElementAttributes(selector, styleProperty, callback) {
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const scrollbarWidth = this.getWidth()
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const manipulationCallBack = element => {
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if (element !== this._element && window.innerWidth > element.clientWidth + scrollbarWidth) {
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return
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}
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this._saveInitialAttribute(element, styleProperty)
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const calculatedValue = window.getComputedStyle(element).getPropertyValue(styleProperty)
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element.style.setProperty(styleProperty, `${callback(Number.parseFloat(calculatedValue))}px`)
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}
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this._applyManipulationCallback(selector, manipulationCallBack)
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}
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_saveInitialAttribute(element, styleProperty) {
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const actualValue = element.style.getPropertyValue(styleProperty)
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if (actualValue) {
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Manipulator.setDataAttribute(element, styleProperty, actualValue)
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}
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}
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_resetElementAttributes(selector, styleProperty) {
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const manipulationCallBack = element => {
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const value = Manipulator.getDataAttribute(element, styleProperty)
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// We only want to remove the property if the value is `null`; the value can also be zero
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if (value === null) {
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element.style.removeProperty(styleProperty)
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return
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}
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Manipulator.removeDataAttribute(element, styleProperty)
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element.style.setProperty(styleProperty, value)
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}
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this._applyManipulationCallback(selector, manipulationCallBack)
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}
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_applyManipulationCallback(selector, callBack) {
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if (isElement(selector)) {
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callBack(selector)
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return
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}
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for (const sel of SelectorEngine.find(selector, this._element)) {
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callBack(sel)
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}
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}
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}
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export default ScrollBarHelper
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