ValueNotifier

live Holds a single observable value and notifies listeners when it changes. Use this to share reactive state between parts of the UI that are not directly related in the element tree. Pair with ValueListenableBuilder to rebuild a subtree whenever the value changes.

Constructor

ValueNotifier

Creates a new notifier with the given initial value.

Properties

Value

The current value. Setting this to a new value notifies all listeners. Setting it to a value that compares equal to the current value is a no-op.

Methods

AddListener

Registers a callback that is invoked whenever the value changes. The callback is invoked synchronously during the value assignment.

Dispose

Disposes this notifier, clearing all listeners and preventing further use.

RemoveListener

Removes a previously registered listener. If the listener was added more than once, only the first occurrence is removed. Does nothing if the listener is not found.