@webcomponents/webcomponentsjs/src/platform/custom-event.js

/**
 * @license
 * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */
// defaultPrevented is broken in IE.
// https://connect.microsoft.com/IE/feedback/details/790389/event-defaultprevented-returns-false-after-preventdefault-was-called
const workingDefaultPrevented = (() => {
    const e = document.createEvent('Event');
    e.initEvent('foo', true, true);
    e.preventDefault();
    return e.defaultPrevented;
})();
if (!workingDefaultPrevented) {
    const origPreventDefault = Event.prototype.preventDefault;
    Event.prototype.preventDefault = function () {
        if (!this.cancelable) {
            return;
        }
        origPreventDefault.call(this);
        Object.defineProperty(this, 'defaultPrevented', {
            get() {
                return true;
            },
            configurable: true
        });
    };
}
const isIE = /Trident/.test(navigator.userAgent);
// Event constructor shim
if (!window.Event || isIE && (typeof window.Event !== 'function')) {
    const origEvent = window.Event;
    window['Event'] =
        ((inType, params) => {
            params = params || {};
            const e = document.createEvent('Event');
            e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable));
            return e;
        });
    if (origEvent) {
        // tslint:disable-next-line:forin
        for (const i in origEvent) {
            // tslint:disable-next-line:no-any
            window['Event'][i] = origEvent[i];
        }
        window['Event'].prototype = origEvent.prototype;
    }
}
// CustomEvent constructor shim
if (!window.CustomEvent || isIE && (typeof window.CustomEvent !== 'function')) {
    window['CustomEvent'] =
        ((inType, params) => {
            params = params || {};
            const e = document.createEvent('CustomEvent');
            e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);
            return e;
        });
    window['CustomEvent'].prototype = window.Event.prototype;
}
if (!window.MouseEvent || isIE && (typeof window.MouseEvent !== 'function')) {
    const origMouseEvent = window.MouseEvent;
    window['MouseEvent'] =
        ((inType, params) => {
            params = params || {};
            const e = document.createEvent('MouseEvent');
            e.initMouseEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.view || window, params.detail, params.screenX, params.screenY, params.clientX, params.clientY, params.ctrlKey, params.altKey, params.shiftKey, params.metaKey, params.button, params.relatedTarget);
            return e;
        });
    if (origMouseEvent) {
        // tslint:disable-next-line:forin
        for (const j in origMouseEvent) {
            // tslint:disable-next-line:no-any
            window.MouseEvent[j] = origMouseEvent[j];
        }
    }
    window['MouseEvent'].prototype = origMouseEvent.prototype;
}
//# sourceMappingURL=custom-event.js.map