rvx/dist/es/core/internals/set-class.js

A signal based rendering library

import { teardown, watch } from "../signals.js";
class ClassBucket {
    #target;
    #entries = [];
    #removeQueue = [];
    #addQueue = [];
    constructor(target) {
        this.#target = target;
    }
    a(token) {
        const entries = this.#entries;
        teardown(() => {
            const removeQueue = this.#removeQueue;
            for (let i = 0; i < entries.length; i++) {
                const entry = entries[i];
                if (entry.t === token) {
                    if (--entry.c === 0) {
                        entries.splice(i, 1);
                        removeQueue.push(token);
                    }
                    return;
                }
            }
        });
        for (let i = 0; i < entries.length; i++) {
            const entry = entries[i];
            if (entry.t === token) {
                entry.c++;
                return;
            }
        }
        entries.push({ t: token, c: 1 });
        this.#addQueue.push(token);
    }
    f() {
        const target = this.#target;
        const removeQueue = this.#removeQueue;
        const addQueue = this.#addQueue;
        if (removeQueue.length > 0) {
            target.classList.remove(...removeQueue);
            removeQueue.length = 0;
        }
        if (addQueue.length > 0) {
            if (target.hasAttribute("class")) {
                target.classList.add(...addQueue);
            }
            else {
                target.setAttribute("class", addQueue.join(" "));
            }
            addQueue.length = 0;
        }
    }
}
function watchClass(value, bucket, flush) {
    watch(value, value => {
        if (typeof value === "string") {
            bucket.a(value);
        }
        else if (value) {
            if (Array.isArray(value)) {
                for (let i = 0; i < value.length; i++) {
                    watchClass(value[i], bucket, false);
                }
            }
            else {
                for (const token in value) {
                    watch(value[token], enable => {
                        if (enable) {
                            bucket.a(token);
                        }
                        if (flush) {
                            bucket.f();
                        }
                    });
                }
            }
        }
        if (flush) {
            bucket.f();
        }
        else {
            flush = true;
        }
    });
}
export function setClass(elem, value) {
    watchClass(value, new ClassBucket(elem), true);
}
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