Does buildSuggestions of showSearch method run continuously? - dart

Question

I'm new in flutter and I have a function to search working with API,and i have created a function called _fetchData() inside StatefulWidget:
_fetchData() async {
print("fetchData Run");
print(widget.query);
this.setState((){
isLoading=true;
});
final response = await http.get(URL+'search/keyword?api_key='+API_KEY+'&query='+widget.query);
if (response.statusCode == 200) {
print(response.body);
var list = json.decode(response.body)["results"] as List;
keywordList = list.map<Keyword>((json)=>Keyword.fromJson(json)).toList();
this.setState((){
isLoading=false;
});
} else {
throw Exception('Failed to load photos');
}
}
and i put my StatefulWidget in buildSuggestions like:
class SearchHome extends SearchDelegate {
#override
List<Widget> buildActions(BuildContext context) {
//widget
}
#override
Widget buildLeading(BuildContext context) {
//widget
}
#override
Widget buildResults(BuildContext context) {
//widget
}
#override
Widget buildSuggestions(BuildContext context) {
//SuggestKeyword is my statefullwidget with _fetchData() function inside
return SuggestKeyword(query: query);
}
}
but i'm confuse why _fetchData() keep running continuously, that's mean my apps keep hit an API, i think it's not good so i want to avoid it
I know i can put SuggestKeyword inside buildResults, but these method need user to submit/enter the keyboard to run, i want to search while the user is still typing, but buildSuggestions keep running even when user is not typing,
am i doing something wrong? any suggestion would appreciated!