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libui-node widgets events

Many widgets have events that are raised when their properties changed, because user interacts with GUI or because programmer has invoked a property setter.

All events are methods that accepts a single callback that receive 0 arguments.

var widget = new libui.UiEntry();

widget.onChanged(function() {
	console.log(widget.text);
});

// set the text contained in the entry
widget.text = 'sample text';

Widgets don't keep an internal list of event listener. If you register more that one callbacks, previous one are lost and never get called. This is implemented directly in libui, maybe we implement Node.js style event emitter in a future release.