onQueryChange property Null safety

(void Function?(Map? next, {Map? prev})?) onQueryChange
final

It is a callback function which accepts widget's prevQuery and nextQuery as parameters.

It is called everytime the widget's query changes. This property is handy in cases where you want to generate a side-effect whenever the widget's query would change.

Implementation

final void Function(Map? /*?*/ next, {Map? prev})? onQueryChange;