NumField constructor
NumField()
Implementation
NumField() : super('NumField') {
numberInput.style
..width = '100%'
..flexGrow = '1';
nodeRoot.children.add(numberInput);
numberInput.onInput.listen((event) {
fireValueChange(value, value);
});
numberInput.onBlur.listen((event) => numberInput.value = value.toString());
}