ValueChangeEvent Support

[chrisw73]

Hi!

Here #44 someone requested an "isEmpty" feature.
I think it would be even nicer to attach a ValueChangeListener.

We have a next-button on the same screen as the signature-pad, which just should become enabled, if a signature has been done.
Currently we use:
signatureField.getElement().addEventListener("click", domEvent -> this.nextButton.setEnabled(true));

which does the job quite well.

Have you considered extending AbstractField instead of Component and add ValueChangeListener Support?

Regards,
Chris

[F0rce]

This has been implented as today with Version v3.1.0. Sorry for the late reply.

If you have any question about the new listener please re-open or open a new one :)