onDidChange property Null safety

OnDidChangeCallback<St, Model>? onDidChange

A function that will be run on State change, after the Widget is built. This function is passed the Model, and if distinct is true, it will only be called if the Model changes. This can be useful for running certain animations after the build is complete. Note: Using a BuildContext inside this callback can cause problems if the callback performs navigation. For navigation purposes, please use onWillChange.


final OnDidChangeCallback<St, Model>? onDidChange;