63 lines
1.9 KiB
JavaScript
63 lines
1.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const utils_1 = require("../utils");
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class ZIndexManager {
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constructor() {
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this.elementZIndex = new Map();
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this.nextZIndex = 2000;
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}
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get elementCount() {
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return this.elementZIndex.size;
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}
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ensureZIndex(el, zIndex) {
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const { elementZIndex } = this;
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if (zIndex !== undefined) {
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el.style.zIndex = `${zIndex}`;
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elementZIndex.delete(el);
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return;
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}
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const { nextZIndex } = this;
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if (elementZIndex.has(el)) {
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const currentZIndex = elementZIndex.get(el);
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if (currentZIndex + 1 === this.nextZIndex)
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return;
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}
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el.style.zIndex = `${nextZIndex}`;
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elementZIndex.set(el, nextZIndex);
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this.nextZIndex = nextZIndex + 1;
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this.squashState();
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}
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unregister(el, zIndex) {
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const { elementZIndex } = this;
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if (elementZIndex.has(el)) {
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elementZIndex.delete(el);
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}
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else if (zIndex === undefined) {
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(0, utils_1.warn)('z-index-manager/unregister-element', 'Element not found when unregistering.');
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}
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this.squashState();
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}
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squashState() {
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const { elementCount } = this;
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if (!elementCount) {
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this.nextZIndex = 2000;
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}
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if (this.nextZIndex - elementCount > 2500)
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this.rearrange();
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}
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rearrange() {
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const elementZIndexPair = Array.from(this.elementZIndex.entries());
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elementZIndexPair.sort((pair1, pair2) => {
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return pair1[1] - pair2[1];
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});
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this.nextZIndex = 2000;
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elementZIndexPair.forEach((pair) => {
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const el = pair[0];
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const zIndex = this.nextZIndex++;
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if (`${zIndex}` !== el.style.zIndex)
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el.style.zIndex = `${zIndex}`;
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});
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}
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}
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exports.default = new ZIndexManager();
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