@inweb/eventemitter2/dist/eventemitter2.module.js

JavaScript event emitter

///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2002-2026, Open Design Alliance (the "Alliance").
// All rights reserved.
// 
// This software and its documentation and related materials are owned by
// the Alliance. The software may only be incorporated into application
// programs owned by members of the Alliance, subject to a signed
// Membership Agreement and Supplemental Software License Agreement with the
// Alliance. The structure and organization of this software are the valuable
// trade secrets of the Alliance and its suppliers. The software is also
// protected by copyright law and international treaty provisions. Application
// programs incorporating this software must include the following statement
// with their copyright notices:
// 
//   This application incorporates Open Design Alliance software pursuant to a
//   license agreement with Open Design Alliance.
//   Open Design Alliance Copyright (C) 2002-2026 by Open Design Alliance.
//   All rights reserved.
// 
// By use of this software, its documentation or related materials, you
// acknowledge and accept the above terms.
///////////////////////////////////////////////////////////////////////////////

class EventEmitter2 {
    constructor() {
        this._listeners = {};
    }
    addEventListener(type, listener) {
        if (this._listeners[type] === undefined)
            this._listeners[type] = [];
        this._listeners[type].push(listener);
        return this;
    }
    removeEventListener(type, listener) {
        if (this._listeners[type] === undefined)
            return this;
        const listeners = this._listeners[type].filter((x) => x !== listener);
        if (listeners.length !== 0)
            this._listeners[type] = listeners;
        else
            delete this._listeners[type];
        return this;
    }
    removeAllListeners(type) {
        if (type)
            delete this._listeners[type];
        else
            this._listeners = {};
        return this;
    }
    emitEvent(event) {
        if (this._listeners[event.type] === undefined)
            return false;
        const invoke = this._listeners[event.type].slice();
        invoke.forEach((listener) => listener.call(this, event));
        return true;
    }
    on(type, listener) {
        return this.addEventListener(type, listener);
    }
    off(type, listener) {
        return this.removeEventListener(type, listener);
    }
    emit(type, ...args) {
        if (typeof type === "string")
            return this.emitEvent({ type, args });
        else if (typeof type === "object")
            return this.emitEvent(type);
        else
            return false;
    }
}

export { EventEmitter2 };
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