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Diffstat (limited to 'vendor/twbs/bootstrap/js/src/util/scrollbar.js')
-rw-r--r-- | vendor/twbs/bootstrap/js/src/util/scrollbar.js | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/vendor/twbs/bootstrap/js/src/util/scrollbar.js b/vendor/twbs/bootstrap/js/src/util/scrollbar.js new file mode 100644 index 000000000..fad9766ac --- /dev/null +++ b/vendor/twbs/bootstrap/js/src/util/scrollbar.js @@ -0,0 +1,97 @@ +/** + * -------------------------------------------------------------------------- + * Bootstrap (v5.0.2): util/scrollBar.js + * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) + * -------------------------------------------------------------------------- + */ + +import SelectorEngine from '../dom/selector-engine' +import Manipulator from '../dom/manipulator' +import { isElement } from './index' + +const SELECTOR_FIXED_CONTENT = '.fixed-top, .fixed-bottom, .is-fixed, .sticky-top' +const SELECTOR_STICKY_CONTENT = '.sticky-top' + +class ScrollBarHelper { + constructor() { + this._element = document.body + } + + getWidth() { + // https://developer.mozilla.org/en-US/docs/Web/API/Window/innerWidth#usage_notes + const documentWidth = document.documentElement.clientWidth + return Math.abs(window.innerWidth - documentWidth) + } + + hide() { + const width = this.getWidth() + this._disableOverFlow() + // give padding to element to balance the hidden scrollbar width + this._setElementAttributes(this._element, 'paddingRight', calculatedValue => calculatedValue + width) + // trick: We adjust positive paddingRight and negative marginRight to sticky-top elements to keep showing fullwidth + this._setElementAttributes(SELECTOR_FIXED_CONTENT, 'paddingRight', calculatedValue => calculatedValue + width) + this._setElementAttributes(SELECTOR_STICKY_CONTENT, 'marginRight', calculatedValue => calculatedValue - width) + } + + _disableOverFlow() { + this._saveInitialAttribute(this._element, 'overflow') + this._element.style.overflow = 'hidden' + } + + _setElementAttributes(selector, styleProp, callback) { + const scrollbarWidth = this.getWidth() + const manipulationCallBack = element => { + if (element !== this._element && window.innerWidth > element.clientWidth + scrollbarWidth) { + return + } + + this._saveInitialAttribute(element, styleProp) + const calculatedValue = window.getComputedStyle(element)[styleProp] + element.style[styleProp] = `${callback(Number.parseFloat(calculatedValue))}px` + } + + this._applyManipulationCallback(selector, manipulationCallBack) + } + + reset() { + this._resetElementAttributes(this._element, 'overflow') + this._resetElementAttributes(this._element, 'paddingRight') + this._resetElementAttributes(SELECTOR_FIXED_CONTENT, 'paddingRight') + this._resetElementAttributes(SELECTOR_STICKY_CONTENT, 'marginRight') + } + + _saveInitialAttribute(element, styleProp) { + const actualValue = element.style[styleProp] + if (actualValue) { + Manipulator.setDataAttribute(element, styleProp, actualValue) + } + } + + _resetElementAttributes(selector, styleProp) { + const manipulationCallBack = element => { + const value = Manipulator.getDataAttribute(element, styleProp) + if (typeof value === 'undefined') { + element.style.removeProperty(styleProp) + } else { + Manipulator.removeDataAttribute(element, styleProp) + element.style[styleProp] = value + } + } + + this._applyManipulationCallback(selector, manipulationCallBack) + } + + _applyManipulationCallback(selector, callBack) { + if (isElement(selector)) { + callBack(selector) + } else { + SelectorEngine.find(selector, this._element).forEach(callBack) + } + } + + isOverflowing() { + return this.getWidth() > 0 + } +} + +export default ScrollBarHelper |