Event.eventType constructor Null safety
Creates a new Event object of the specified type.
This is analogous to document.createEvent. Normally events should be created via their constructors, if available.
var e = new Event.type('MouseEvent', 'mousedown', true, true);
Implementation
factory Event.eventType(String type, String name,
{bool canBubble: true, bool cancelable: true}) {
final Event e = document._createEvent(type);
e._initEvent(name, canBubble, cancelable);
return e;
}