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import { computeEdges } from '../util/dom-geom'
import { removeElement, createElement, applyStyle, applyStyleProp } from '../util/dom-manip'
import { ElementScrollController } from './scroll-controller'
export interface ScrollbarWidths {
left: number
right: number
bottom: number
}
/*
Embodies a div that has potential scrollbars
*/
export default class ScrollComponent extends ElementScrollController {
overflowX: string
overflowY: string
constructor(overflowX: string, overflowY: string) {
super(
createElement('div', {
className: 'fc-scroller'
})
)
this.overflowX = overflowX
this.overflowY = overflowY
this.applyOverflow()
}
// sets to natural height, unlocks overflow
clear() {
this.setHeight('auto')
this.applyOverflow()
}
destroy() {
removeElement(this.el)
}
// Overflow
// -----------------------------------------------------------------------------------------------------------------
applyOverflow() {
applyStyle(this.el, {
overflowX: this.overflowX,
overflowY: this.overflowY
})
}
// Causes any 'auto' overflow values to resolves to 'scroll' or 'hidden'.
// Useful for preserving scrollbar widths regardless of future resizes.
// Can pass in scrollbarWidths for optimization.
lockOverflow(scrollbarWidths: ScrollbarWidths) {
let overflowX = this.overflowX
let overflowY = this.overflowY
scrollbarWidths = scrollbarWidths || this.getScrollbarWidths()
if (overflowX === 'auto') {
overflowX = (
scrollbarWidths.bottom || // horizontal scrollbars?
this.canScrollHorizontally() // OR scrolling pane with massless scrollbars?
) ? 'scroll' : 'hidden'
}
if (overflowY === 'auto') {
overflowY = (
scrollbarWidths.left || scrollbarWidths.right || // horizontal scrollbars?
this.canScrollVertically() // OR scrolling pane with massless scrollbars?
) ? 'scroll' : 'hidden'
}
applyStyle(this.el, { overflowX, overflowY })
}
setHeight(height: number | string) {
applyStyleProp(this.el, 'height', height)
}
getScrollbarWidths(): ScrollbarWidths {
let edges = computeEdges(this.el)
return {
left: edges.scrollbarLeft,
right: edges.scrollbarRight,
bottom: edges.scrollbarBottom
}
}
}