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/*
Records offset information for a set of elements, relative to an origin element.
Can record the left/right OR the top/bottom OR both.
Provides methods for querying the cache by position.
*/
export default class PositionCache {
originClientRect: ClientRect
els: HTMLElement[] // assumed to be siblings
originEl: HTMLElement // options can override the natural originEl
isHorizontal: boolean // whether to query for left/right/width
isVertical: boolean // whether to query for top/bottom/height
// arrays of coordinates (from topleft of originEl)
// caller can access these directly
lefts: any
rights: any
tops: any
bottoms: any
constructor(originEl: HTMLElement, els: HTMLElement[], isHorizontal: boolean, isVertical: boolean) {
this.originEl = originEl
this.els = els
this.isHorizontal = isHorizontal
this.isVertical = isVertical
}
// Queries the els for coordinates and stores them.
// Call this method before using and of the get* methods below.
build() {
let originEl = this.originEl
let originClientRect = this.originClientRect =
originEl.getBoundingClientRect() // relative to viewport top-left
if (this.isHorizontal) {
this.buildElHorizontals(originClientRect.left)
}
if (this.isVertical) {
this.buildElVerticals(originClientRect.top)
}
}
// Populates the left/right internal coordinate arrays
buildElHorizontals(originClientLeft: number) {
let lefts = []
let rights = []
for (let el of this.els) {
let rect = el.getBoundingClientRect()
lefts.push(rect.left - originClientLeft)
rights.push(rect.right - originClientLeft)
}
this.lefts = lefts
this.rights = rights
}
// Populates the top/bottom internal coordinate arrays
buildElVerticals(originClientTop: number) {
let tops = []
let bottoms = []
for (let el of this.els) {
let rect = el.getBoundingClientRect()
tops.push(rect.top - originClientTop)
bottoms.push(rect.bottom - originClientTop)
}
this.tops = tops
this.bottoms = bottoms
}
// Given a left offset (from document left), returns the index of the el that it horizontally intersects.
// If no intersection is made, returns undefined.
leftToIndex(leftPosition: number) {
let lefts = this.lefts
let rights = this.rights
let len = lefts.length
let i
for (i = 0; i < len; i++) {
if (leftPosition >= lefts[i] && leftPosition < rights[i]) {
return i
}
}
}
// Given a top offset (from document top), returns the index of the el that it vertically intersects.
// If no intersection is made, returns undefined.
topToIndex(topPosition: number) {
let tops = this.tops
let bottoms = this.bottoms
let len = tops.length
let i
for (i = 0; i < len; i++) {
if (topPosition >= tops[i] && topPosition < bottoms[i]) {
return i
}
}
}
// Gets the width of the element at the given index
getWidth(leftIndex: number) {
return this.rights[leftIndex] - this.lefts[leftIndex]
}
// Gets the height of the element at the given index
getHeight(topIndex: number) {
return this.bottoms[topIndex] - this.tops[topIndex]
}
}