I am a newbie to flutter, I am having a problem with passing the data to my search delegate class. The problem is that I have two tabs and I want to search within the active tab. So I am trying to send a variable that tells which tab is it and which table to look for value.
Here is what my code looks like:
class HomePage extends StatefulWidget {
static final String routeName = 'home';
@override
State<StatefulWidget> createState() {
return new _HomePageState();
}
}
class _HomePageState extends State<HomePage> with TickerProviderStateMixin {
var activeTab = "activity";
var _authToken, _id, _name, _emails, _userImage;
@override
void initState() {
super.initState();
tabController = TabController(vsync: this, length: 2)..addListener(() {
setState(() {
switch (tabController.index) {
case 0:
activeTab = "activity";
break;
case 1:
activeTab = "subparticipants";
break;
}
});
});
}
@override
Widget build(BuildContext context) {
return new Scaffold(
key: _scaffoldKey,
// appBar: new AppBar(
// title: Text('Dashboard'),
// ),
body: DefaultTabController(
length: 2,
child: Scaffold(
appBar: AppBar(
bottom: TabBar(
labelColor: Color(0xFFFFFFFF),
indicatorSize: TabBarIndicatorSize.tab,
tabs: [
//Tab(icon: Icon(Icons.directions_car)),
Tab(
text: "Activity Zone",
),
Tab(
text: "Sub Participant",
)
],
controller: tabController,
),
title: Text(
'Dashboard',
style: new TextStyle(
color: const Color(0xFFFFFFFF),
fontSize: 20.0,
fontWeight: FontWeight.w600,
letterSpacing: 0.3,
),
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.search),
onPressed: () {
showSearch(context: context, delegate: DataSearch(activeTab));
},
)
],
),
body: TabBarView(
controller: tabController,
children: [
TabActivity(),
TabSubparticipant(),
],
),
floatingActionButton: FloatingActionButton(
onPressed: () {
print(
'Current Index: $activeTab');
},
),
drawer: _buildDrawer(context),
),
),
);
}
}
class DataSearch extends SearchDelegate{
final String activeTab;
DataSearch(this.activeTab);
@override
List<Widget> buildActions(BuildContext context){
return [
IconButton(
icon: Icon(Icons.arrow_back),
onPressed: (){
query=activeTab;
},
)
];
}
@override
Widget buildLeading(BuildContext context) => IconButton(
icon: Icon(Icons.close),
onPressed: () => Navigator.of(context).pop(),
);
@override
Widget buildResults(BuildContext context) => Text('Result');
@override
Widget buildSuggestions(BuildContext context) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
'Search by job id, asset name, client name $query',
style: new TextStyle(
color: Colors.black, fontWeight: FontWeight.bold, fontSize: 22.0),
),
);
}
}
When I try to get $activeTab and show it in query or somewhere else, It just gives out the error:
flutter: The following assertion was thrown building _SearchPage<dynamic>(dirty, dependencies:
flutter: [_LocalizationsScope-[GlobalKey#a02e3], _InheritedTheme], state: _SearchPageState<dynamic>#eceaa):
flutter: 'package:flutter/src/widgets/basic.dart': Failed assertion: line 6173 pos 15: 'child != null': is
I am a bit confused how should I pass value to it. I have seen some of similar questions but they are no help. Like this or this question . None of these have any of these errors. Can you please let me know what am I doing wrong. Whats the issue? Please help.
Well, For someone who dumb as me and is having the same problem as I am, Here is how you can fix the issue, So I was not passing the correct value to Search delegate and was not picking it up properly. Here is the fixed part of code
class DataSearch extends SearchDelegate {
DataSearch({
@required this.activeTab,
});
final activeTab;
@override
Widget buildResults(BuildContext context) {
if (activeTab == "subparticipants") {
...... .
....
..
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