vasille/lib/value/pointer.js

The same framework which is designed to build bulletproof frontends (core library).

import { Reference } from "./reference.js";
/**
 * Forward only link type
 * @class Forward
 * @extends Reference
 */
export class Forward extends Reference {
    /**
     * forwarded value
     * @type IValue
     */
    target;
    /**
     * Handler to receive updates from forwarded value
     */
    handler;
    /**
     * Constructs a value forwarder
     * @param value {IValue} is source of forwarded data
     * @param ctx lifetime context
     */
    constructor(value, ctx) {
        super(value.V);
        this.handler = (v) => {
            this.V = v;
        };
        this.target = value;
        value.on(this.handler);
        ctx?.bind(this);
    }
    destroy() {
        this.target.off(this.handler);
    }
}
/**
 * Backward only link type
 * @class Backward
 * @extends Reference
 */
export class Backward extends Reference {
    /**
     * target, which receive the updates
     * @type IValue
     */
    target;
    /**
     * Constructs a value backward stream
     * @param value {IValue} target, which receive the updates
     */
    constructor(value) {
        super(value.V);
        this.target = value;
    }
    get V() {
        return super.V;
    }
    set V(value) {
        super.V = value;
        this.target.V = value;
    }
}