I have a statefull widget W1 which calls a stateless widget W2.
W2 has onTap functionality. I want to show an alert dialog in W2's onTap().
onTap:() {Alert(context: context, title:'Hi');},
I dont get any error, but no alert is shown on tap. I tried passing context as a parameter to W2 but I still dont see any dialog box.
What is the right way to show a dialog box from W2?
I am using rflutter_alert package Link
Thanks
You have to wrap your Alert(context: context, title:'Hi'); with showDialog(context: context, builder: (BuildContext context) => Alert(context: context, title:'Hi'));
Here is the cookbook sample:
Future<void> _neverSatisfied() async {
return showDialog<void>(
context: context,
barrierDismissible: false, // user must tap button!
builder: (BuildContext context) {
return AlertDialog(
title: Text('Rewind and remember'),
content: SingleChildScrollView(
child: ListBody(
children: <Widget>[
Text('You will never be satisfied.'),
Text('You\’re like me. I’m never satisfied.'),
],
),
),
actions: <Widget>[
FlatButton(
child: Text('Regret'),
onPressed: () {
Navigator.of(context).pop();
},
),
],
);
},
);
}
Anyway, for your question about how to pass context, If you are creating a Stateless or Stateful widget you dont need to pass the context, you can get it from build(BuildContext context) {}.
Adding .show() in end solved it.
onTap:() {Alert(context: context, title:'Hi').show();}
Its clearly documented in rflutter_alert package, but I somehow missed it.
Pass the context in the function call in onTap:
onTap:(context) {Alert(context: context, title:'Hi');},
Related
I have sigIn function that get data from Api and move to another screen if request is successful and if request is not successful then show alertDialog
I change state and before fetching data I show CircularProgressIndicator to make user know that data is fetching.
But when alertDialog window pops up and I close it then CircularProgressIndicator doesn't disappear. How to remove WaitingSignInAuth and show me Scaffold with inputs
When error comes then I emit ErrorSignInAuth but why there is WaitingSignInAuth to.. Why ErrorSignInAuth doesn't replace WaitingSignInAuth or it should work differently?
This is the code:
#override
Widget build(BuildContext context) {
return BlocConsumer<AuthCubit, AuthState>(
listener: (context, state) {
if (state is WaitingSignInAuth) {
showDialog(
context: context,
builder: (context) => Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height,
color: Colors.black.withOpacity(0.6),
child: const Center(
child: CircularProgressIndicator(
strokeWidth: 1,
color: Colors.black,
backgroundColor: Colors.white,
),
),
));
}
if (state is ErrorSignInAuth) {
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text("Bad request"),
content: SingleChildScrollView(
child: ListBody(
children: <Widget>[
Text("Error")
],
),
),
actions: <Widget>[
TextButton(
child: const Text("Close"),
onPressed: () {
Navigator.pop(context); // If i press it then alertDialog diappears but not the loading circle
},
)
],
);
}
);
}
},
);
}
This is how it looks like:
The issue is, that you showDialog() twice. First is shown when WaitingSignInAuth state is fired, and the second one when you receive ErrorSignInAuth.
So Navigator.pop(context); in the "error" alert dialog closes only the showDialog that you've triggered in if (state is ErrorSignInAuth), the second dialog, which contains progress indicator is still visible.
To easy fix it, you can change your code to:
TextButton(
child: const Text("Close"),
onPressed: () {
Navigator.pop(context);
Navigator.pop(context);
},
)
But in my opinion thats not the best fix to your issue. IMO you don't need to show ProgressIndicator for WaitingSignInAuth in the dialog. Adjust your UI in the way, that the container with progress indicator will be displayed over it, but this doesn't need to be a dialog.
I'm having an issue trying to pop a dialog that contains a circle loader. I actually pop fine once my data is loaded, but in debug mode it's showing an exception that I can't figure out how to fix.
I have a stateful screen that on init I use the following code:
WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
showLoading();
});
The method showLoading is as follows:
void showLoading() {
//let's show the loading bar
showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
dialogContext = context;
return AppLoader();
},
);
}
Where AppLoader simply returns:
class AppLoader extends StatelessWidget {
#override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
backgroundColor: Colors.transparent,
body: Center(
child: Stack(
alignment: Alignment.center,
children: <Widget>[
SizedBox(
child: new CircularProgressIndicator(),
height: 80.0,
width: 80.0,
),
],
),
),
);
}
}
dialogContent is defined in the initial of the class as:
late BuildContext dialogcontext;
The main bulk of my code looks like this:
#override
Widget build(BuildContext context) {
return Container(
color: ColorConstant.gray100,
child: Scaffold(
backgroundColor: ColorConstant.gray100,
body: Stack(
children: <Widget>[
getMainListViewUI(),
SizedBox(
height: MediaQuery.of(context).padding.bottom,
)
],
),
),
);
}
Widget getMainListViewUI() {
return FutureBuilder<bool>(
future: getData(),
builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
return ListView.builder(
itemCount: listViews.length,
scrollDirection: Axis.vertical,
itemBuilder: (BuildContext context, int index) {
return listViews[index];
},
);
},
);
}
Basically, the issue that I have is that when I finish getting the data from (getData()), I use:
Navigator.pop(dialogContext);
This works great: it removes the circle loader and I can see the screen behind it, no issues, no errors. However, if I run in debug mode, when I do a hotsync, it always shows me the error:
Looking up a deactivated widget's ancestor on dialog pop
I understand that this is because of the Navigator.pop that I am doing, but I don't get it. I've defined the dialogContext, which is what I am passing to the showDialog, and that's what I am popping. I've also tried setting a scheduled navigator, but again, same issue.
Any advice please?
You can check if widget is mounted or not. This problem is likely to occur when you pass a context and have async function. Can you add this before navigation and see if problem is solved
if(!mounted) return;
Problem solved. The issue is the my getData method was being called multiple times, the first time it pops the loading widget fine, after that it would throw the error which is correct since the loading widget no longer exists.
This is how we close a dialog from INSIDE
showSomeDialog() {
return showDialog(
context: context,
builder: (BuildContext contextPopup) {
return AlertDialog(
content: Center(
child: RaisedButton(
onPressed: () {
Navigator.of(contextPopup).pop();
},
child: Text('Close me inside'),
),
),);
}
);
}
How to close this dialog from OUTSIDE ? In other words, how does the stateful widget creating this dialog can access the variable contextPopup ? The problem with Navigator.of(context).pop() is that it will close the topmost widget on the Navigation stack, not this specific dialog.
In Android, to close a dialog programmatically from outside, you just do:
dialog.dismiss();
here is the widget I use it as the function to refresh my widgets (it is usually a floating button with onpressed capability), so I want to use key of my widget in here to refresh my widget
Widget floatingButton(int index){
if(index == 0){
return FloatingActionButton(
backgroundColor: Color.fromRGBO(29, 142, 41,1),
disabledElevation: 12,
child: Icon(Icons.refresh),
onPressed: () {
prefix0.Dashboard k = new prefix0.Dashboard();
k.createState().reassemble();
});
}
else return null;
}
and this is my widget which I want to refresh it, with its key "refresh" in the future builder
FutureBuilder(
key: refrKey,
future: model.tData(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.data == null) {
return Center(
child: Column(children: [
SizedBox(
height: MediaQuery.of(context).size.height / 6,),
Text('no data')
]));
} else { ...
I already got an answer ;
`
onPressed: () {
Navigator.push( context, new MaterialPageRoute(
builder: (context) => this.build(context)));
},
`
instead of using setState() which is not working as I want ,I rebuild the whole widget by call itself again and hance it get refreshed
The setState() method will initiate re-render the UI widget for whom the state actually belongs to. the setState() method does not initiate re-render whole UI as #Omi said. You can refer to the official article about Adding interactivity to your app. If you've managed the state correctly, it should reflect in UI automatically upon setState() call.
You don't refresh a widget. If, for instance, you want to change the text on the button, you use a string variable to hold the text and you change that variable in a setState. The system will do the rest.
Hi i am newbie into flutter, how can i achieve custom PopUpMenu as shown in below screenshot.
ScreenShot
Any help would be appreciated, Thanks..
You should use the method showDialog to display an AlertDialog Widget.
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text("PopUp title"),
content: Text("PopUp content text"),
actions: <Widget>[
FlatButton(child: Text("Close"), onPressed: () => Navigator.pop(context))
],
);
});