How do I make widgets not rebuild in flutter?

The ultimate solution to prevent widget rebuild by flutter

A nice way to rebuild only a child widget when a value in the parent changes is to use ValueNotifier and ValueListenableBuilder . Add an instance of ValueNotifier to the parent’s state class, and wrap the widget you want to rebuild in a ValueListenableBuilder .

When setState() is called on a State, all descendent widgets rebuild . Therefore, localize the setState() call to the part of the subtree whose UI actually needs to change.

If you call setState() on WidgetB it’ll rebuild itself and it’s descendants, no matter if they are Stateless or Stateful Widgets.