Use case

Forms and FormFieldhave an autoValidate property. But if set to true it will validate on every keystroke/change which is annoying if you start typing e.g. an email address and with the first press the message Not a valid email address is displayed
It would be much more user friendly if an autoValidate option existed that waits with validation till the user(focus) leaves the field when he has finished editing.

Proposal

add a new property

bool validateOnLostFocus

to the Form and FormField classes that allows this functionality