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Flutter - How to correctly delete a tab in a TabBarView
I'm using TabBarView to create a browser-like multi-tab application with dynamic tab creation. I've been following this answer. However I run into a quite bizzare problem when trying to delete a tab. Since I'm a beginner, I'm not sure if I did the wrong way or it is a Flutter bug.
Overview of this problem: If there remains two tabs in TabBarView, and you deleted the second tab while you are viewing it, TabBarView throws a exception, complaining that it can not perform scroll animation when item number < 2. However, this exception keeps coming up even if I switched tab in advance in the function. And this exception screws tab management from that point on.
I'd really appreciate if someone can show me the correct way of implementing a dynamic tab system.
The demo code is as follows. The code is complete and ready to run. Create a few tabs, then delete them from back to front. An exception will occur when you delete the second last tab. After that the tab system will behave like a mess.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> with TickerProviderStateMixin {
List<Tab> tabs = ;TabController tabController;var count = 1;
void newTab() {
setState(() {
tabs.add(Tab(text: '$count',));count++;
tabController = TabController(length: tabs.length, vsync: this);
});
}
void closeCurrentTab() {
setState(() {
// A bunch of if-statement..........
// Even if you switch the tab before deletion, the error still occur.
//tabController.animateTo(tabController.index-1);
tabs.removeAt(tabController.index);
tabController = TabController(length: tabs.length, vsync: this);
});
}
@override void initState() {
super.initState();
tabs.add(Tab(text: '0',));
tabController = TabController(length: tabs.length, vsync: this);
}
@override void dispose() {
tabController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
actions: <Widget>[
IconButton(icon: Icon(Icons.add), onPressed: newTab),
IconButton(icon: Icon(Icons.close), onPressed: closeCurrentTab,)
],
bottom: TabBar(controller: tabController, tabs: tabs.map((tab) => tab).toList()),// A trick to trigger TabBar rebuild.
),
body: TabBarView(controller: tabController, children: tabs.map((tab) => Text(tab.text)).toList()),
),
);
}
}
It appears to me that the scroll animation after deletion is performed regardless of TabController.animateTo().
tabs widget
flutter flutter-layout asked Nov 15 '18 at 13:07
First_Strike
1128
add a comment |
I'm using TabBarView to create a browser-like multi-tab application with dynamic tab creation. I've been following this answer. However I run into a quite bizzare problem when trying to delete a tab. Since I'm a beginner, I'm not sure if I did the wrong way or it is a Flutter bug.
Overview of this problem: If there remains two tabs in TabBarView, and you deleted the second tab while you are viewing it, TabBarView throws a exception, complaining that it can not perform scroll animation when item number < 2. However, this exception keeps coming up even if I switched tab in advance in the function. And this exception screws tab management from that point on.
I'd really appreciate if someone can show me the correct way of implementing a dynamic tab system.
The demo code is as follows. The code is complete and ready to run. Create a few tabs, then delete them from back to front. An exception will occur when you delete the second last tab. After that the tab system will behave like a mess.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> with TickerProviderStateMixin {
List<Tab> tabs = ;TabController tabController;var count = 1;
void newTab() {
setState(() {
tabs.add(Tab(text: '$count',));count++;
tabController = TabController(length: tabs.length, vsync: this);
});
}
void closeCurrentTab() {
setState(() {
// A bunch of if-statement..........
// Even if you switch the tab before deletion, the error still occur.
//tabController.animateTo(tabController.index-1);
tabs.removeAt(tabController.index);
tabController = TabController(length: tabs.length, vsync: this);
});
}
@override void initState() {
super.initState();
tabs.add(Tab(text: '0',));
tabController = TabController(length: tabs.length, vsync: this);
}
@override void dispose() {
tabController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
actions: <Widget>[
IconButton(icon: Icon(Icons.add), onPressed: newTab),
IconButton(icon: Icon(Icons.close), onPressed: closeCurrentTab,)
],
bottom: TabBar(controller: tabController, tabs: tabs.map((tab) => tab).toList()),// A trick to trigger TabBar rebuild.
),
body: TabBarView(controller: tabController, children: tabs.map((tab) => Text(tab.text)).toList()),
),
);
}
}
It appears to me that the scroll animation after deletion is performed regardless of TabController.animateTo().
tabs widget
flutter flutter-layout asked Nov 15 '18 at 13:07
First_Strike
1128
Well, since there is currently no answer, I'm sharing my workaround. Customizing PageView instead of using TabBarView solved this problem. A great example to follow is package:simple_coverflow.
– First_Strike
Nov 17 '18 at 3:55
add a comment |
I'm using TabBarView to create a browser-like multi-tab application with dynamic tab creation. I've been following this answer. However I run into a quite bizzare problem when trying to delete a tab. Since I'm a beginner, I'm not sure if I did the wrong way or it is a Flutter bug.
Overview of this problem: If there remains two tabs in TabBarView, and you deleted the second tab while you are viewing it, TabBarView throws a exception, complaining that it can not perform scroll animation when item number < 2. However, this exception keeps coming up even if I switched tab in advance in the function. And this exception screws tab management from that point on.
I'd really appreciate if someone can show me the correct way of implementing a dynamic tab system.
The demo code is as follows. The code is complete and ready to run. Create a few tabs, then delete them from back to front. An exception will occur when you delete the second last tab. After that the tab system will behave like a mess.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> with TickerProviderStateMixin {
List<Tab> tabs = ;TabController tabController;var count = 1;
void newTab() {
setState(() {
tabs.add(Tab(text: '$count',));count++;
tabController = TabController(length: tabs.length, vsync: this);
});
}
void closeCurrentTab() {
setState(() {
// A bunch of if-statement..........
// Even if you switch the tab before deletion, the error still occur.
//tabController.animateTo(tabController.index-1);
tabs.removeAt(tabController.index);
tabController = TabController(length: tabs.length, vsync: this);
});
}
@override void initState() {
super.initState();
tabs.add(Tab(text: '0',));
tabController = TabController(length: tabs.length, vsync: this);
}
@override void dispose() {
tabController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
actions: <Widget>[
IconButton(icon: Icon(Icons.add), onPressed: newTab),
IconButton(icon: Icon(Icons.close), onPressed: closeCurrentTab,)
],
bottom: TabBar(controller: tabController, tabs: tabs.map((tab) => tab).toList()),// A trick to trigger TabBar rebuild.
),
body: TabBarView(controller: tabController, children: tabs.map((tab) => Text(tab.text)).toList()),
),
);
}
}
It appears to me that the scroll animation after deletion is performed regardless of TabController.animateTo().
tabs widget
flutter flutter-layout asked Nov 15 '18 at 13:07
First_Strike
1128
I'm using TabBarView to create a browser-like multi-tab application with dynamic tab creation. I've been following this answer. However I run into a quite bizzare problem when trying to delete a tab. Since I'm a beginner, I'm not sure if I did the wrong way or it is a Flutter bug.
Overview of this problem: If there remains two tabs in TabBarView, and you deleted the second tab while you are viewing it, TabBarView throws a exception, complaining that it can not perform scroll animation when item number < 2. However, this exception keeps coming up even if I switched tab in advance in the function. And this exception screws tab management from that point on.
I'd really appreciate if someone can show me the correct way of implementing a dynamic tab system.
The demo code is as follows. The code is complete and ready to run. Create a few tabs, then delete them from back to front. An exception will occur when you delete the second last tab. After that the tab system will behave like a mess.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> with TickerProviderStateMixin {
List<Tab> tabs = ;TabController tabController;var count = 1;
void newTab() {
setState(() {
tabs.add(Tab(text: '$count',));count++;
tabController = TabController(length: tabs.length, vsync: this);
});
}
void closeCurrentTab() {
setState(() {
// A bunch of if-statement..........
// Even if you switch the tab before deletion, the error still occur.
//tabController.animateTo(tabController.index-1);
tabs.removeAt(tabController.index);
tabController = TabController(length: tabs.length, vsync: this);
});
}
@override void initState() {
super.initState();
tabs.add(Tab(text: '0',));
tabController = TabController(length: tabs.length, vsync: this);
}
@override void dispose() {
tabController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
actions: <Widget>[
IconButton(icon: Icon(Icons.add), onPressed: newTab),
IconButton(icon: Icon(Icons.close), onPressed: closeCurrentTab,)
],
bottom: TabBar(controller: tabController, tabs: tabs.map((tab) => tab).toList()),// A trick to trigger TabBar rebuild.
),
body: TabBarView(controller: tabController, children: tabs.map((tab) => Text(tab.text)).toList()),
),
);
}
}
It appears to me that the scroll animation after deletion is performed regardless of TabController.animateTo().
tabs widget
flutter flutter-layout tabs widget
flutter flutter-layout asked Nov 15 '18 at 13:07
First_Strike
1128
asked Nov 15 '18 at 13:07
First_Strike
1128
asked Nov 15 '18 at 13:07
First_Strike
1128
asked Nov 15 '18 at 13:07
First_Strike
1128
asked Nov 15 '18 at 13:07
First_Strike
1128
1128
Well, since there is currently no answer, I'm sharing my workaround. Customizing PageView instead of using TabBarView solved this problem. A great example to follow is package:simple_coverflow.
– First_Strike
Nov 17 '18 at 3:55
add a comment |
Well, since there is currently no answer, I'm sharing my workaround. Customizing PageView instead of using TabBarView solved this problem. A great example to follow is package:simple_coverflow.
– First_Strike
Nov 17 '18 at 3:55
Well, since there is currently no answer, I'm sharing my workaround. Customizing PageView instead of using TabBarView solved this problem. A great example to follow is package:simple_coverflow.
– First_Strike
Nov 17 '18 at 3:55
Well, since there is currently no answer, I'm sharing my workaround. Customizing PageView instead of using TabBarView solved this problem. A great example to follow is package:simple_coverflow.
– First_Strike
Nov 17 '18 at 3:55
add a comment |
1 Answer
1
active
oldest
votes
Well it turns out to be a flutter widget bug. It should not throw this exception when deleting tabs.
As reported in this Github issue. It should be fixed sometime in the future.
Right now I'm using PageView as an alternative. PageView works just fine.
answered Nov 19 '18 at 15:40
First_Strike
1128
add a comment |
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1 Answer
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1 Answer
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active
oldest
votes
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oldest
votes
active
oldest
votes
Well it turns out to be a flutter widget bug. It should not throw this exception when deleting tabs.
As reported in this Github issue. It should be fixed sometime in the future.
Right now I'm using PageView as an alternative. PageView works just fine.
answered Nov 19 '18 at 15:40
First_Strike
1128
add a comment |
Well it turns out to be a flutter widget bug. It should not throw this exception when deleting tabs.
As reported in this Github issue. It should be fixed sometime in the future.
Right now I'm using PageView as an alternative. PageView works just fine.
answered Nov 19 '18 at 15:40
First_Strike
1128
add a comment |
Well it turns out to be a flutter widget bug. It should not throw this exception when deleting tabs.
As reported in this Github issue. It should be fixed sometime in the future.
Right now I'm using PageView as an alternative. PageView works just fine.
answered Nov 19 '18 at 15:40
First_Strike
1128
Well it turns out to be a flutter widget bug. It should not throw this exception when deleting tabs.
As reported in this Github issue. It should be fixed sometime in the future.
Right now I'm using PageView as an alternative. PageView works just fine.
answered Nov 19 '18 at 15:40
First_Strike
1128
answered Nov 19 '18 at 15:40
First_Strike
1128
answered Nov 19 '18 at 15:40
First_Strike
1128
answered Nov 19 '18 at 15:40
First_Strike
1128
1128
add a comment |
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Well, since there is currently no answer, I'm sharing my workaround. Customizing PageView instead of using TabBarView solved this problem. A great example to follow is package:simple_coverflow.
– First_Strike
Nov 17 '18 at 3:55