Function events

docs/app/js/sanddance-app.js:107811–107828

* Create a new event stream from an event source. * @param {object} source - The event source to monitor. The input must * support the addEventListener method. * @param {string} type - The event type. * @param {function(object): boolean} [filter] - Event filter function. * @param {function(obj

(source, type, filter4, apply)

 *   used as the downstream event value.
 * @return {EventStream}
 */ function events(source, type, filter4, apply) {
    const df = this, s = stream(filter4, apply), send = function(e) {
        e.dataflow = df;
        try {
            s.receive(e);
        } catch (error) {
            df.error(error);
        } finally{
            df.run();
        }
    };
    let sources;
    if (typeof source === "string" && typeof document !== "undefined") sources = document.querySelectorAll(source);
    else sources = (0, _vegaUtil.array)(source);
    const n = sources.length;
    for(let i = 0; i < n; ++i)sources[i].addEventListener(type, send);
    return s;
}
function parse(data, format) {
    const locale = this.locale();
    return (0, _vegaLoader.read)(data, format, locale.timeParse, locale.utcParse);