Flutter TextField( controller)

Listener class Null safety. A widget that calls callbacks in response to common pointer events . It listens to events that can construct gestures, such as when the pointer is pressed, moved, then released or canceled.

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 provider package is an easy to use package which is basically a wrapper around the InheritedWidgets that makes it easier to use and manage . It provides a state management technique that is used for managing a piece of data around the app.

ValueNotifier is a special type of class that extends Changenotifier, which can hold a single value and notifies the widgets which are listening to it whenever its holding value gets change .15 Eki 2021