openreplay/tracker/tracker-assist/src/Mouse.ts

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No EOL
2.7 KiB
TypeScript

type XY = [number, number]
export default class Mouse {
private mouse: HTMLDivElement
private position: [number,number] = [0,0]
constructor() {
this.mouse = document.createElement('div');
Object.assign(this.mouse.style, {
width: "20px",
height: "20px",
opacity: ".4",
borderRadius: "50%",
position: "absolute",
zIndex: "999998",
background: "radial-gradient(red, transparent)",
});
document.body.appendChild(this.mouse);
window.addEventListener("scroll", this.handleWScroll)
window.addEventListener("resize", this.resetLastScrEl)
}
move(pos: XY) {
if (this.position[0] !== pos[0] || this.position[1] !== pos[1]) {
this.resetLastScrEl()
}
this.position = pos;
Object.assign(this.mouse.style, {
left: `${pos[0] || 0}px`,
top: `${pos[1] || 0}px`
})
}
getPosition(): XY {
return this.position;
}
click(pos: XY) {
const el = document.elementFromPoint(pos[0], pos[1])
if (el instanceof HTMLElement) {
el.click()
el.focus()
}
}
private readonly pScrEl = document.scrollingElement || document.documentElement // Is it always correct
private lastScrEl: Element | "window" | null = null
private resetLastScrEl = () => { this.lastScrEl = null }
private handleWScroll = e => {
if (e.target !== this.lastScrEl &&
this.lastScrEl !== "window") {
this.resetLastScrEl()
}
}
scroll(delta: XY) {
// what would be the browser-like logic?
const [mouseX, mouseY] = this.position
const [dX, dY] = delta
let el = this.lastScrEl
// Scroll the same one
if (el instanceof Element) {
el.scrollLeft += dX
el.scrollTop += dY
return // TODO: if not scrolled
}
if (el === "window") {
window.scroll(this.pScrEl.scrollLeft + dX, this.pScrEl.scrollTop + dY)
return
}
el = document.elementFromPoint(
mouseX-this.pScrEl.scrollLeft,
mouseY-this.pScrEl.scrollTop,
)
while (el) {
//if(el.scrollWidth > el.clientWidth) // - This check doesn't work in common case
const esl = el.scrollLeft
el.scrollLeft += dX
const est = el.scrollTop
el.scrollTop += dY
if (esl !== el.scrollLeft || est !== el.scrollTop) {
this.lastScrEl = el
return
} else {
el = el.parentElement
}
}
// If not scrolled
window.scroll(this.pScrEl.scrollLeft + dX, this.pScrEl.scrollTop + dY)
this.lastScrEl = "window"
}
remove() {
if (this.mouse.parentElement) {
document.body.removeChild(this.mouse);
}
window.removeEventListener("scroll", this.handleWScroll)
window.removeEventListener("resize", this.resetLastScrEl)
}
}