Function prepareEvent

spec/helpers/util.js:133–193

* prepareEvent works with firePreparedEvent. * * It allows test to: * - create the event * - spy a method on this event * - fire the event * * Example: * var p = document.querySelector('p'); * var evt = prepareEvent(p, 'keydown', { keyCode: MediumEditor.util.keyCode.ENTE

(element, eventName, options)

 * You can see a live example for tests related to `disableDoubleReturn`
 */
function prepareEvent (element, eventName, options) {
    var evt;

    options = options || {};

    if (document.createEvent) {
        // dispatch for firefox + others
        evt = document.createEvent('HTMLEvents');
        evt.initEvent(eventName, true, true); // event type,bubbling,cancelable

        evt.currentTarget = options.currentTarget ? options.currentTarget : element;

        if (options.keyCode) {
            evt.keyCode = options.keyCode;
            evt.which = options.keyCode;
        }

        if (options.ctrlKey) {
            evt.ctrlKey = true;
        }

        if (options.metaKey) {
            evt.metaKey = true;
        }

        if (options.target) {
            evt.target = options.target;
        }

        if (options.relatedTarget) {
            evt.relatedTarget = options.relatedTarget;
        }

        if (options.shiftKey) {
            evt.shiftKey = true;
        }

        if (options.altKey) {
          evt.altKey = true;
        }

        if (eventName.indexOf('drag') !== -1 || eventName === 'drop') {
            evt.dataTransfer = {
                dropEffect: ''
            };
            // File API only allows access to 'files' on drop, not on any other event
            if (!isIE9() && eventName === 'drop') {
                var file = dataURItoBlob('data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7');
                if (!file.type) {
                    file.type = 'image/gif';
                }
                evt.dataTransfer.files = [file];
            }
        }
    } else {
        // dispatch for IE
        evt = document.createEventObject();
    }