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import { Rect, intersectRects } from './geom'
import { sanitizeScrollbarWidth, getIsRtlScrollbarOnLeft } from './scrollbars'
export interface EdgeInfo {
borderLeft: number
borderRight: number
borderTop: number
borderBottom: number
scrollbarLeft: number
scrollbarRight: number
scrollbarBottom: number
paddingLeft?: number
paddingRight?: number
paddingTop?: number
paddingBottom?: number
}
export function computeEdges(el, getPadding = false): EdgeInfo {
let computedStyle = window.getComputedStyle(el)
let borderLeft = parseInt(computedStyle.borderLeftWidth, 10) || 0
let borderRight = parseInt(computedStyle.borderRightWidth, 10) || 0
let borderTop = parseInt(computedStyle.borderTopWidth, 10) || 0
let borderBottom = parseInt(computedStyle.borderBottomWidth, 10) || 0
let scrollbarLeftRight = sanitizeScrollbarWidth(el.offsetWidth - el.clientWidth - borderLeft - borderRight)
let scrollbarBottom = sanitizeScrollbarWidth(el.offsetHeight - el.clientHeight - borderTop - borderBottom)
let res: EdgeInfo = {
borderLeft,
borderRight,
borderTop,
borderBottom,
scrollbarBottom,
scrollbarLeft: 0,
scrollbarRight: 0
}
if (getIsRtlScrollbarOnLeft() && computedStyle.direction === 'rtl') { // is the scrollbar on the left side?
res.scrollbarLeft = scrollbarLeftRight
} else {
res.scrollbarRight = scrollbarLeftRight
}
if (getPadding) {
res.paddingLeft = parseInt(computedStyle.paddingLeft, 10) || 0
res.paddingRight = parseInt(computedStyle.paddingRight, 10) || 0
res.paddingTop = parseInt(computedStyle.paddingTop, 10) || 0
res.paddingBottom = parseInt(computedStyle.paddingBottom, 10) || 0
}
return res
}
export function computeInnerRect(el, goWithinPadding = false) {
let outerRect = computeRect(el)
let edges = computeEdges(el, goWithinPadding)
let res = {
left: outerRect.left + edges.borderLeft + edges.scrollbarLeft,
right: outerRect.right - edges.borderRight - edges.scrollbarRight,
top: outerRect.top + edges.borderTop,
bottom: outerRect.bottom - edges.borderBottom - edges.scrollbarBottom
}
if (goWithinPadding) {
res.left += edges.paddingLeft
res.right -= edges.paddingRight
res.top += edges.paddingTop
res.bottom -= edges.paddingBottom
}
return res
}
export function computeRect(el): Rect {
let rect = el.getBoundingClientRect()
return {
left: rect.left + window.pageXOffset,
top: rect.top + window.pageYOffset,
right: rect.right + window.pageXOffset,
bottom: rect.bottom + window.pageYOffset
}
}
function computeViewportRect(): Rect {
return {
left: window.pageXOffset,
right: window.pageXOffset + document.documentElement.clientWidth,
top: window.pageYOffset,
bottom: window.pageYOffset + document.documentElement.clientHeight
}
}
export function computeHeightAndMargins(el: HTMLElement) {
let computed = window.getComputedStyle(el)
return el.getBoundingClientRect().height +
parseInt(computed.marginTop, 10) +
parseInt(computed.marginBottom, 10)
}
// does not return window
export function getClippingParents(el: HTMLElement): HTMLElement[] {
let parents: HTMLElement[] = []
while (el instanceof HTMLElement) { // will stop when gets to document or null
let computedStyle = window.getComputedStyle(el)
if (computedStyle.position === 'fixed') {
break
}
if ((/(auto|scroll)/).test(computedStyle.overflow + computedStyle.overflowY + computedStyle.overflowX)) {
parents.push(el)
}
el = el.parentNode as HTMLElement
}
return parents
}
export function computeClippingRect(el: HTMLElement): Rect {
return getClippingParents(el)
.map(function(el) {
return computeInnerRect(el)
})
.concat(computeViewportRect())
.reduce(function(rect0, rect1) {
return intersectRects(rect0, rect1) || rect1 // should always intersect
})
}