I have a custom FieldItem with a method doing a calculation on the field’s values:
class MyFieldItem extends FieldItemBase { ... public function getAmountInEuros() { $amount = $this->get('amount')->getValue(); $currency = $this->get('currency')->getValue(); $exchange_rate = $this->getExchangeRate($currency); return $exchange_rate * $amount; } ... I have a custom widget for that FieldItem where I need to do exactly the same calculation.
class MyWidget extends WidgetBase { ... public function getAmountInEuros() { ... } ... } Of course, I would prefer to write down this logic only in one place, preferably in the FieldItem definition.
How can I access the corresponding FieldItem from within the widget?
(The code is just a minimal example that should show the principal problem with a complex field and widget that work otherwise.)
