export class EventDispatcher {
    constructor() {
        this._listeners = new Map();
    }
    addEventListener(type, listener) {
        var _a;
        this.removeEventListener(type, listener);
        if (!this._listeners.get(type)) {
            this._listeners.set(type, []);
        }
        (_a = this._listeners.get(type)) === null || _a === void 0 ? void 0 : _a.push(listener);
    }
    dispatchEvent(type, args) {
        var _a;
        (_a = this._listeners.get(type)) === null || _a === void 0 ? void 0 : _a.forEach((handler) => handler(args));
    }
    hasEventListener(type) {
        return !!this._listeners.get(type);
    }
    removeAllEventListeners(type) {
        if (!type) {
            this._listeners = new Map();
        }
        else {
            this._listeners.delete(type);
        }
    }
    removeEventListener(type, listener) {
        const arr = this._listeners.get(type);
        if (!arr) {
            return;
        }
        const length = arr.length, idx = arr.indexOf(listener);
        if (idx < 0) {
            return;
        }
        if (length === 1) {
            this._listeners.delete(type);
        }
        else {
            arr.splice(idx, 1);
        }
    }
}