frontend-admin / Daocheng-Yading

import { union, without } from './utils/js_utils.js';
export class EnterLeaveCounter {
    enter(enteringNode) {
        const previousLength = this.entered.length;
        const isNodeEntered = (node)=>this.isNodeInDocument(node) && (!node.contains || node.contains(enteringNode))
        ;
        this.entered = union(this.entered.filter(isNodeEntered), [
            enteringNode
        ]);
        return previousLength === 0 && this.entered.length > 0;
    }
    leave(leavingNode) {
        const previousLength = this.entered.length;
        this.entered = without(this.entered.filter(this.isNodeInDocument), leavingNode);
        return previousLength > 0 && this.entered.length === 0;
    }
    reset() {
        this.entered = [];
    }
    constructor(isNodeInDocument){
        this.entered = [];
        this.isNodeInDocument = isNodeInDocument;
    }
}

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