Issue
I am using typeahead package in flutter to get suggestions to users as they type, what I want is to color the suggestions while the user is typing as its shouwn in the picture Colored suggestions while typing
Here is a simple example that am trying to implement
Main.dart
import 'package:flutter/material.dart';
import 'package:flutter_typeahead/flutter_typeahead.dart';
import 'CitiesService.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Colored suggestions Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Colored suggestions Demo'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
final myControllerCity = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Form(
key: this._formKey,
child: Padding(
padding: EdgeInsets.all(32.0),
child: Column(
children: <Widget>[
//SizedBox(height: 50,),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Flexible(
child: TypeAheadFormField(
textFieldConfiguration: TextFieldConfiguration(
controller: myControllerCity,
decoration: InputDecoration(labelText: 'City')),
suggestionsCallback: (pattern) {
return CitiesService.getSuggestionsCities(pattern);
},
itemBuilder: (context, suggestion) {
//
List<String> splitted_names_of_cities = suggestion
.toString()
.toLowerCase()
.split(myControllerCity.text);
final children = <Widget>[];
for (var i = 1;
i < splitted_names_of_cities.length;
i++) {
children.add(new ListTile(
title: Text.rich(
TextSpan(
children: [
TextSpan(
text: myControllerCity.text,
style: TextStyle(color: Colors.red),
),
TextSpan(text: splitted_names_of_cities[i]),
],
),
)));
}
print("this is the list $splitted_names_of_cities");
return new ListView(
children: children,
);
},
transitionBuilder: (context, suggestionsBox, controller) {
return suggestionsBox;
},
onSuggestionSelected: (suggestion) {
myControllerCity.text = suggestion;
},
),
),
],
),
],
),
),
)),
);
}
}
And here is the function of the suggestions
static List<String> getSuggestionsCities(String query) {
List<String> wilayas = [];
algeria_cites.forEach((element) => wilayas.contains(element['wilaya_name_ascii']) ?
null : wilayas.add(element['wilaya_name_ascii']) );
wilayas.retainWhere((s) => s.toLowerCase().contains(query.toLowerCase()));
return wilayas;
}
Solution
In the previous code, for each item of the suggested cities name I was creating a full ListTile
but I had to create TextSpan instead of that.
But each item has its specific length, for that reason I used List<InlineSpan>
.
So here is the itemBuilder
after fixing the error.
itemBuilder: (context, suggestion) {
List<InlineSpan> temp = [];
String suggestion_in_lower_case = suggestion.toString().toLowerCase();
List<String> splitted_names_of_cities = suggestion_in_lower_case.split(myControllerCity.text.toLowerCase());
for (var i = 0; i < splitted_names_of_cities.length-1; i++) {
if(splitted_names_of_cities.contains(myControllerCity.text.toLowerCase()));{
temp.add(
TextSpan(
text: splitted_names_of_cities[i],
style: TextStyle(
height: 1.0,
color: Colors.black,
),
),
);
temp.add(
TextSpan(
text: myControllerCity.text.toLowerCase(),
style: TextStyle(
color: Colors.red,
),
),
);
}
}
temp.add(
TextSpan(
text: splitted_names_of_cities.last,
style: TextStyle(
color: Colors.black,
),
),
);
return ListTile(
title: Text.rich(
TextSpan(
children: temp,
),
)
);
},
So it is working as expected, here is the demo.
https://i.stack.imgur.com/Tfs95.gif
Answered By – Ishak Hari
Answer Checked By – Marie Seifert (FlutterFixes Admin)