Homepage-imsyy/js/cursor.js

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JavaScript
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var CURSOR;
Math.lerp = (a, b, n) => (1 - n) * a + n * b;
const getStyle = (el, attr) => {
try {
return window.getComputedStyle ?
window.getComputedStyle(el)[attr] :
el.currentStyle[attr];
} catch (e) {}
return "";
};
class Cursor {
constructor() {
this.pos = {
curr: null,
prev: null
};
this.pt = [];
this.create();
this.init();
this.render();
}
move(left, top) {
this.cursor.style["left"] = `${left}px`;
this.cursor.style["top"] = `${top}px`;
}
create() {
if (!this.cursor) {
this.cursor = document.createElement("div");
this.cursor.id = "cursor";
this.cursor.classList.add("hidden");
document.body.append(this.cursor);
}
var el = document.getElementsByTagName('*');
for (let i = 0; i < el.length; i++)
if (getStyle(el[i], "cursor") == "pointer")
this.pt.push(el[i].outerHTML);
document.body.appendChild((this.scr = document.createElement("style")));
this.scr.innerHTML = `* {cursor: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8' width='10px' height='10px'><circle cx='4' cy='4' r='4' fill='white' /></svg>") 4 4, auto !important}`;
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}
refresh() {
this.scr.remove();
this.cursor.classList.remove("hover");
this.cursor.classList.remove("active");
this.pos = {
curr: null,
prev: null
};
this.pt = [];
this.create();
this.init();
this.render();
}
init() {
document.onmouseover = e => this.pt.includes(e.target.outerHTML) && this.cursor.classList.add("hover");
document.onmouseout = e => this.pt.includes(e.target.outerHTML) && this.cursor.classList.remove("hover");
document.onmousemove = e => {
(this.pos.curr == null) && this.move(e.clientX - 8, e.clientY - 8);
this.pos.curr = {
x: e.clientX - 8,
y: e.clientY - 8
};
this.cursor.classList.remove("hidden");
};
document.onmouseenter = e => this.cursor.classList.remove("hidden");
document.onmouseleave = e => this.cursor.classList.add("hidden");
document.onmousedown = e => this.cursor.classList.add("active");
document.onmouseup = e => this.cursor.classList.remove("active");
}
render() {
if (this.pos.prev) {
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this.pos.prev.x = Math.lerp(this.pos.prev.x, this.pos.curr.x, 0.45);
this.pos.prev.y = Math.lerp(this.pos.prev.y, this.pos.curr.y, 0.45);
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this.move(this.pos.prev.x, this.pos.prev.y);
} else {
this.pos.prev = this.pos.curr;
}
requestAnimationFrame(() => this.render());
}
}
(() => {
CURSOR = new Cursor();
// 需要重新获取列表时,使用 CURSOR.refresh()
})();