You just need to add a field to child widget then in parent widget change value of that field and call setState() .
Read moreHow do I stop widgets from rebuilding my Flutter?
The ultimate solution to prevent widget rebuild by flutter
Read moreHow do you rebuild the child widget in Flutter?
The solution is to pass a new Key to WidgetB every time we need it to be rebuilt : WidgetA will see that WidgetB has changed and will rebuild it when setState is called. In other words, whenever a stateful widget’s Key property changes, calling setState on its parent will force a rebuild of the stateful widget.12 Tem 2021
Read moreDoes setState rebuild entire widget tree?
If you call setState() on WidgetB it’ll rebuild itself and it’s descendants , no matter if they are Stateless or Stateful Widgets.
Read moreHow do you rebuild a specific widget in flutter?
The solution is to pass a new Key to WidgetB every time we need it to be rebuilt : WidgetA will see that WidgetB has changed and will rebuild it when setState is called. In other words, whenever a stateful widget’s Key property changes, calling setState on its parent will force a rebuild of the stateful widget.12 Tem 2021
Read moreWhy do we need stateless widget?
Stateless widget are useful when the part of the user interface you are describing does not depend on anything other than the configuration information in the object itself and the BuildContext in which the widget is inflated .
Read moreWhat is the difference between a stateless widget and a stateful widget in flutter?
A widget is either stateful or stateless. If a widget can change—when a user interacts with it, for example—it’s stateful. A stateless widget never changes . Icon , IconButton , and Text are examples of stateless widgets.
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