import { hasPassiveEventSupport } from './env'; import { isObject } from './inspect'; // --- Constants --- export var EVENT_OPTIONS_PASSIVE = { passive: true }; export var EVENT_OPTIONS_NO_CAPTURE = { passive: true, capture: false }; // --- Utils --- // Normalize event options based on support of passive option // Exported only for testing purposes export var parseEventOptions = function parseEventOptions(options) { /* istanbul ignore else: can't test in JSDOM, as it supports passive */ if (hasPassiveEventSupport) { return isObject(options) ? options : { capture: !!options || false }; } else { // Need to translate to actual Boolean value return !!(isObject(options) ? options.capture : options); } }; // Attach an event listener to an element export var eventOn = function eventOn(el, evtName, handler, options) { if (el && el.addEventListener) { el.addEventListener(evtName, handler, parseEventOptions(options)); } }; // Remove an event listener from an element export var eventOff = function eventOff(el, evtName, handler, options) { if (el && el.removeEventListener) { el.removeEventListener(evtName, handler, parseEventOptions(options)); } }; // Utility method to add/remove a event listener based on first argument (boolean) // It passes all other arguments to the `eventOn()` or `eventOff` method export var eventOnOff = function eventOnOff(on) { var method = on ? eventOn : eventOff; for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) { args[_key - 1] = arguments[_key]; } method.apply(void 0, args); };