How do you pass a function from one widget to another in Flutter?

Calling a method of child widget from a parent widget is discouraged in Flutter. Instead, Flutter encourages you to pass down the state of a child as constructor parameters. Instead of calling a method of the child, you just call setState in the parent widget to update its children .

There’s (at least) two ways to pass data from a child widget to a parent widget in Flutter; Shared object using Singleton pattern or callbacks .

In flutter, the inherited widget is a base class that allows those classes to extend the information under the tree from it. Inherited widgets are also a kind of state management technique. It works by telling registered build references when a change occurs .

In flutter, the inherited widget is a base class that allows those classes to extend the information under the tree from it. Inherited widgets are also a kind of state management technique. It works by telling registered build references when a change occurs .

The inherited widget works in conjunction with a stateful widget and allows you to pass that StatefulWidgets state to all of its ancestors . Its a convenience widget. So you don’t have to type the code in every class to pass state down to its children.