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I have little issue in one of my sample app.
If anyone can help me to sort this out , that would be a great help.
i have created sample application and i use streams to load data to screen , i have one screen to save data , and same screen is used to edit the saved data.At bottom navigation bar i have 3 options to select , lets call them "Option A","Option B" and "Option C" , user tap on "Option B" and save the data. i store them in database.once user loads edit screen i have to load all option and previously saved option. i load master data (all options) using bloc and bind data to bottom navigation bar , How do i set the previously selected option when form load ?
Widget _buildBottomNavigationBar() {
List<BottomNavigationBarItem> items = List();
int iconIdex = 1;
return StreamBuilder(
stream: _ratioBloC.inputObservable(),
builder:
(context, AsyncSnapshot<List<CementSandAggregateView>> snapshot) {
_scaffoldContext = context;
if (snapshot.hasData) {
snapshot.data.forEach((mix) => {
items.add(BottomNavigationBarItem(
icon: iconIdex == 1
? Icon(Icons.filter_1)
: iconIdex == 2
? Icon(Icons.filter_2)
: Icon(Icons.filter_3),
title: Column(
children: <Widget>[Text(mix.name), Text(mix.ratio)],
))),
ratioArr[iconIdex - 1] = mix.id,
iconIdex++
});
return BottomNavigationBar(
items: items,
currentIndex: _selectedRatio,
fixedColor: Theme.of(context).buttonColor,
onTap: _onItemTapped);
} else {
return Container(
height: 0.0,
width: 0.0,
);
}
},
);
}class CementSandAggregateMixBloC {
BehaviorSubject<List<CementSandAggregateView>> _cSAMixController;
BLoCProvider provider;
CementSandAggregateMixBloC(){
provider = new BLoCProvider();
_cSAMixController = new BehaviorSubject<List<CementSandAggregateView>>();
_init();
}
_init() async{
List<CementSandAggregateView> data = await provider.getAllRatios();
_cSAMixController.add(data);
}
Observable<List<CementSandAggregateView>> inputObservable() => _cSAMixController.stream;
void dispose() {
_cSAMixController.close();
}
}
