Draggable widget childWhenDragging not rendering updates
#39406
Labels
found in release: 3.3
Found to occur in 3.3
found in release: 3.6
Found to occur in 3.6
framework
flutter/packages/flutter repository. See also f: labels.
has reproducible steps
The issue has been confirmed reproducible and is ready to work on
P2
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Comments
BondarenkoStas
added
f: material design
|
The question is open at https://stackoverflow.com/questions/57472626/how-to-update-draggable-feedback-widget-while-dragging. But seems it's a bug with flutter itself. |
HansMuller
removed
the
f: material design
|
Persists with current master flutter doctor -v |
VladyslavBondarenko
added
found in release: 1.21
|
I was experiencing this issue and found that wrapping the feedback widget in a container with specified height and width fixed this problem. My guess is if the feedback widget does not have anything to render inside, it renders to 1 or 0 pixels because the widget sort of "breaks out" of the parent's constraints. |
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@dominic-deantonio No sure I follow. In my minimal example the feedback widget has a fixed width and height. It is displayed when dragging but its data (Text value) is not rerendered while dragging and clicking the button at the same time. Did you have the same issue? And if so how would you solve it in the minimal example? https://dartpad.dev/b6409e10de32b280b8938aa75364fa7b |
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I am able to reproduce the issue on the latest stable 3.3 and master 3.6. The Screen.Recording.2022-11-28.at.11.52.33.PM.movcode sampleimport 'package:flutter/material.dart';
void main() async {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Draggable Test',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
late int counter;
@override
void initState() {
counter = 0;
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Draggable Test'),
),
body: Column(
children: <Widget>[
Draggable(
feedback: Container(
color: Colors.red,
width: 100,
height: 100,
child: Text(counter.toString(),style: TextStyle(color: Colors.white),),
),
childWhenDragging: Container(
color: Colors.red,
width: 100,
height: 100,
child: Text(counter.toString(),style: TextStyle(color: Colors.white),),
),
child: Container(
color: Colors.red,
width: 100,
height: 100,
child: Text(counter.toString(),style: TextStyle(color: Colors.white),),
),
),
ElevatedButton(
onPressed: () {
setState(() {
counter += 1;
});
},
child: const Text("plus"),
)
],
),
);
}
}flutter doctor -v (mac) |
maheshj01
added
found in release: 3.3
maheshj01
changed the title
childWhenDragging not rendering updates
flutter-triage-bot
bot
added
team-framework
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Updates are rendered to the childWhenDragging widget but not to the feedback widget.
Steps to Reproduce
https://gist.github.com/mannfeldt/e33e2f8324b783a8fd5b5252f7eedc1b
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