diginext-utils/esm/EventDispatcher.js

README.md

class EventDispatcher {
    constructor() { }
    addEventListener(type, listener) {
        if (this._listeners === undefined)
            this._listeners = {};
        const listeners = this._listeners;
        if (listeners[type] === undefined) {
            listeners[type] = [];
        }
        if (listeners[type].indexOf(listener) === -1) {
            listeners[type].push(listener);
        }
    }
    hasEventListener(type, listener) {
        if (this._listeners === undefined)
            return false;
        const listeners = this._listeners;
        return listeners[type] !== undefined && listeners[type].indexOf(listener) !== -1;
    }
    removeEventListener(type, listener) {
        if (this._listeners === undefined)
            return;
        const listeners = this._listeners;
        const listenerArray = listeners[type];
        if (listenerArray !== undefined) {
            const index = listenerArray.indexOf(listener);
            if (index !== -1) {
                listenerArray.splice(index, 1);
            }
        }
    }
    dispatchEvent(event) {
        if (this._listeners === undefined)
            return;
        const listeners = this._listeners;
        const listenerArray = listeners[event.type];
        if (listenerArray !== undefined) {
            event.target = this;
            // Make a copy, in case listeners are removed while iterating.
            const array = listenerArray.slice(0);
            for (let i = 0, l = array.length; i < l; i++) {
                array[i].call(this, event);
            }
        }
    }
}
export { EventDispatcher };
export default EventDispatcher;
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