Flutter: Dissmissible widgets disable Tabview drag detection
2
I have two tabs, the left tab having a list of tiles and the right tab having nothing. The user can drag the screen from right-to-left or left-to-right to get from one tab to the other.
The left tab has a list of dismissible tiles that only have "direction: DismissDirection.startToEnd" (from left-to-right) enabled so that the user can still theoretically drag (from right-to-left) to go to the right tab.
However, I believe the Dismissible widget still receives the right-to-left drag information which is disabling the TabView drag to change tabs.
In essence, how do I allow the right-to-left drag to be detected by only the TabView and not the Dismissible item?
If an explicit solution/example with code snippets can be given, I would very very much appreciate the help!
Here's a paste for your main.dart file:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/semantics.dart';
void main() {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.dark(),
home: MainPage(),
);
}
}
class MainPage extends StatefulWidget {
@override
State<StatefulWidget> createState() => _MainPageState();
}
class _MainPageState extends State<MainPage>
with SingleTickerProviderStateMixin {
TabController _tabController;
@override
void initState() {
_tabController = TabController(vsync: this, length: 2, initialIndex: 1);
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
color: Colors.black,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Expanded(
child: TabBarView(
controller: _tabController,
children: <Widget>[
TabWithSomething(),
TabWithNothing(),
],
),
),
],
),
),
),
);
}
}
class TabWithNothing extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Center(
child: Container(
child: Text("Swipe from left-to-right!"),
),
);
}
}
class TabWithSomethingItem implements Comparable<TabWithSomethingItem> {
TabWithSomethingItem({this.index, this.name, this.subject, this.body});
TabWithSomethingItem.from(TabWithSomethingItem item)
: index = item.index,
name = item.name,
subject = item.subject,
body = item.body;
final int index;
final String name;
final String subject;
final String body;
@override
int compareTo(TabWithSomethingItem other) => index.compareTo(other.index);
}
class TabWithSomething extends StatefulWidget {
const TabWithSomething({Key key}) : super(key: key);
static const String routeName = '/material/leave-behind';
@override
TabWithSomethingState createState() => TabWithSomethingState();
}
class TabWithSomethingState extends State<TabWithSomething> {
List<TabWithSomethingItem> TabWithSomethingItems;
void initListItems() {
TabWithSomethingItems =
List<TabWithSomethingItem>.generate(10, (int index) {
return TabWithSomethingItem(
index: index,
name: 'Item $index',
subject: 'Swipe from left-to-right to delete',
body: "Swipe from right-to-left to go back to old tab");
});
}
@override
void initState() {
super.initState();
initListItems();
}
void _handleDelete(TabWithSomethingItem item) {
setState(() {
TabWithSomethingItems.remove(item);
});
}
@override
Widget build(BuildContext context) {
Widget body;
body = ListView(
children:
TabWithSomethingItems.map<Widget>((TabWithSomethingItem item) {
return _TabWithSomethingListItem(
item: item,
onDelete: _handleDelete,
dismissDirection: DismissDirection.startToEnd,
);
}).toList());
return body;
}
}
class _TabWithSomethingListItem extends StatelessWidget {
const _TabWithSomethingListItem({
Key key,
@required this.item,
@required this.onDelete,
@required this.dismissDirection,
}) : super(key: key);
final TabWithSomethingItem item;
final DismissDirection dismissDirection;
final void Function(TabWithSomethingItem) onDelete;
void _handleDelete() {
onDelete(item);
}
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
return Semantics(
customSemanticsActions: <CustomSemanticsAction, VoidCallback>{
const CustomSemanticsAction(label: 'Delete'): _handleDelete,
},
child: Dismissible(
key: ObjectKey(item),
direction: dismissDirection,
onDismissed: (DismissDirection direction) => _handleDelete(),
background: Container(
color: theme.primaryColor,
child: const ListTile(
leading: Icon(Icons.delete, color: Colors.white, size: 36.0))),
child: Container(
decoration: BoxDecoration(
color: theme.canvasColor,
border: Border(bottom: BorderSide(color: theme.dividerColor))),
child: ListTile(
title: Text(item.name),
subtitle: Text('${item.subject}n${item.body}'),
isThreeLine: true),
),
),
);
}
}
UPDATE:
I'm thinking we could change the "dismissible.dart" file to change the "TabControlller", but i'm not sure how I might do that.
In the "dismissible.dart" file:
...
void _handleDragUpdate(DragUpdateDetails details) {
if (!_isActive || _moveController.isAnimating)
return;
final double delta = details.primaryDelta;
if (delta < 0) print(delta); // thinking of doing something here
...
flutter drag tabview asked Nov 12 at 0:15
Johnny Boy
956
add a comment |
2
I have two tabs, the left tab having a list of tiles and the right tab having nothing. The user can drag the screen from right-to-left or left-to-right to get from one tab to the other.
The left tab has a list of dismissible tiles that only have "direction: DismissDirection.startToEnd" (from left-to-right) enabled so that the user can still theoretically drag (from right-to-left) to go to the right tab.
However, I believe the Dismissible widget still receives the right-to-left drag information which is disabling the TabView drag to change tabs.
In essence, how do I allow the right-to-left drag to be detected by only the TabView and not the Dismissible item?
If an explicit solution/example with code snippets can be given, I would very very much appreciate the help!
Here's a paste for your main.dart file:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/semantics.dart';
void main() {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.dark(),
home: MainPage(),
);
}
}
class MainPage extends StatefulWidget {
@override
State<StatefulWidget> createState() => _MainPageState();
}
class _MainPageState extends State<MainPage>
with SingleTickerProviderStateMixin {
TabController _tabController;
@override
void initState() {
_tabController = TabController(vsync: this, length: 2, initialIndex: 1);
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
color: Colors.black,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Expanded(
child: TabBarView(
controller: _tabController,
children: <Widget>[
TabWithSomething(),
TabWithNothing(),
],
),
),
],
),
),
),
);
}
}
class TabWithNothing extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Center(
child: Container(
child: Text("Swipe from left-to-right!"),
),
);
}
}
class TabWithSomethingItem implements Comparable<TabWithSomethingItem> {
TabWithSomethingItem({this.index, this.name, this.subject, this.body});
TabWithSomethingItem.from(TabWithSomethingItem item)
: index = item.index,
name = item.name,
subject = item.subject,
body = item.body;
final int index;
final String name;
final String subject;
final String body;
@override
int compareTo(TabWithSomethingItem other) => index.compareTo(other.index);
}
class TabWithSomething extends StatefulWidget {
const TabWithSomething({Key key}) : super(key: key);
static const String routeName = '/material/leave-behind';
@override
TabWithSomethingState createState() => TabWithSomethingState();
}
class TabWithSomethingState extends State<TabWithSomething> {
List<TabWithSomethingItem> TabWithSomethingItems;
void initListItems() {
TabWithSomethingItems =
List<TabWithSomethingItem>.generate(10, (int index) {
return TabWithSomethingItem(
index: index,
name: 'Item $index',
subject: 'Swipe from left-to-right to delete',
body: "Swipe from right-to-left to go back to old tab");
});
}
@override
void initState() {
super.initState();
initListItems();
}
void _handleDelete(TabWithSomethingItem item) {
setState(() {
TabWithSomethingItems.remove(item);
});
}
@override
Widget build(BuildContext context) {
Widget body;
body = ListView(
children:
TabWithSomethingItems.map<Widget>((TabWithSomethingItem item) {
return _TabWithSomethingListItem(
item: item,
onDelete: _handleDelete,
dismissDirection: DismissDirection.startToEnd,
);
}).toList());
return body;
}
}
class _TabWithSomethingListItem extends StatelessWidget {
const _TabWithSomethingListItem({
Key key,
@required this.item,
@required this.onDelete,
@required this.dismissDirection,
}) : super(key: key);
final TabWithSomethingItem item;
final DismissDirection dismissDirection;
final void Function(TabWithSomethingItem) onDelete;
void _handleDelete() {
onDelete(item);
}
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
return Semantics(
customSemanticsActions: <CustomSemanticsAction, VoidCallback>{
const CustomSemanticsAction(label: 'Delete'): _handleDelete,
},
child: Dismissible(
key: ObjectKey(item),
direction: dismissDirection,
onDismissed: (DismissDirection direction) => _handleDelete(),
background: Container(
color: theme.primaryColor,
child: const ListTile(
leading: Icon(Icons.delete, color: Colors.white, size: 36.0))),
child: Container(
decoration: BoxDecoration(
color: theme.canvasColor,
border: Border(bottom: BorderSide(color: theme.dividerColor))),
child: ListTile(
title: Text(item.name),
subtitle: Text('${item.subject}n${item.body}'),
isThreeLine: true),
),
),
);
}
}
UPDATE:
I'm thinking we could change the "dismissible.dart" file to change the "TabControlller", but i'm not sure how I might do that.
In the "dismissible.dart" file:
...
void _handleDragUpdate(DragUpdateDetails details) {
if (!_isActive || _moveController.isAnimating)
return;
final double delta = details.primaryDelta;
if (delta < 0) print(delta); // thinking of doing something here
...
asked Nov 12 at 0:15
Johnny Boy
956
add a comment |
2
2
2
I have two tabs, the left tab having a list of tiles and the right tab having nothing. The user can drag the screen from right-to-left or left-to-right to get from one tab to the other.
The left tab has a list of dismissible tiles that only have "direction: DismissDirection.startToEnd" (from left-to-right) enabled so that the user can still theoretically drag (from right-to-left) to go to the right tab.
However, I believe the Dismissible widget still receives the right-to-left drag information which is disabling the TabView drag to change tabs.
In essence, how do I allow the right-to-left drag to be detected by only the TabView and not the Dismissible item?
If an explicit solution/example with code snippets can be given, I would very very much appreciate the help!
Here's a paste for your main.dart file:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/semantics.dart';
void main() {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.dark(),
home: MainPage(),
);
}
}
class MainPage extends StatefulWidget {
@override
State<StatefulWidget> createState() => _MainPageState();
}
class _MainPageState extends State<MainPage>
with SingleTickerProviderStateMixin {
TabController _tabController;
@override
void initState() {
_tabController = TabController(vsync: this, length: 2, initialIndex: 1);
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
color: Colors.black,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Expanded(
child: TabBarView(
controller: _tabController,
children: <Widget>[
TabWithSomething(),
TabWithNothing(),
],
),
),
],
),
),
),
);
}
}
class TabWithNothing extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Center(
child: Container(
child: Text("Swipe from left-to-right!"),
),
);
}
}
class TabWithSomethingItem implements Comparable<TabWithSomethingItem> {
TabWithSomethingItem({this.index, this.name, this.subject, this.body});
TabWithSomethingItem.from(TabWithSomethingItem item)
: index = item.index,
name = item.name,
subject = item.subject,
body = item.body;
final int index;
final String name;
final String subject;
final String body;
@override
int compareTo(TabWithSomethingItem other) => index.compareTo(other.index);
}
class TabWithSomething extends StatefulWidget {
const TabWithSomething({Key key}) : super(key: key);
static const String routeName = '/material/leave-behind';
@override
TabWithSomethingState createState() => TabWithSomethingState();
}
class TabWithSomethingState extends State<TabWithSomething> {
List<TabWithSomethingItem> TabWithSomethingItems;
void initListItems() {
TabWithSomethingItems =
List<TabWithSomethingItem>.generate(10, (int index) {
return TabWithSomethingItem(
index: index,
name: 'Item $index',
subject: 'Swipe from left-to-right to delete',
body: "Swipe from right-to-left to go back to old tab");
});
}
@override
void initState() {
super.initState();
initListItems();
}
void _handleDelete(TabWithSomethingItem item) {
setState(() {
TabWithSomethingItems.remove(item);
});
}
@override
Widget build(BuildContext context) {
Widget body;
body = ListView(
children:
TabWithSomethingItems.map<Widget>((TabWithSomethingItem item) {
return _TabWithSomethingListItem(
item: item,
onDelete: _handleDelete,
dismissDirection: DismissDirection.startToEnd,
);
}).toList());
return body;
}
}
class _TabWithSomethingListItem extends StatelessWidget {
const _TabWithSomethingListItem({
Key key,
@required this.item,
@required this.onDelete,
@required this.dismissDirection,
}) : super(key: key);
final TabWithSomethingItem item;
final DismissDirection dismissDirection;
final void Function(TabWithSomethingItem) onDelete;
void _handleDelete() {
onDelete(item);
}
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
return Semantics(
customSemanticsActions: <CustomSemanticsAction, VoidCallback>{
const CustomSemanticsAction(label: 'Delete'): _handleDelete,
},
child: Dismissible(
key: ObjectKey(item),
direction: dismissDirection,
onDismissed: (DismissDirection direction) => _handleDelete(),
background: Container(
color: theme.primaryColor,
child: const ListTile(
leading: Icon(Icons.delete, color: Colors.white, size: 36.0))),
child: Container(
decoration: BoxDecoration(
color: theme.canvasColor,
border: Border(bottom: BorderSide(color: theme.dividerColor))),
child: ListTile(
title: Text(item.name),
subtitle: Text('${item.subject}n${item.body}'),
isThreeLine: true),
),
),
);
}
}
UPDATE:
I'm thinking we could change the "dismissible.dart" file to change the "TabControlller", but i'm not sure how I might do that.
In the "dismissible.dart" file:
...
void _handleDragUpdate(DragUpdateDetails details) {
if (!_isActive || _moveController.isAnimating)
return;
final double delta = details.primaryDelta;
if (delta < 0) print(delta); // thinking of doing something here
...
asked Nov 12 at 0:15
Johnny Boy
956
I have two tabs, the left tab having a list of tiles and the right tab having nothing. The user can drag the screen from right-to-left or left-to-right to get from one tab to the other.
The left tab has a list of dismissible tiles that only have "direction: DismissDirection.startToEnd" (from left-to-right) enabled so that the user can still theoretically drag (from right-to-left) to go to the right tab.
However, I believe the Dismissible widget still receives the right-to-left drag information which is disabling the TabView drag to change tabs.
In essence, how do I allow the right-to-left drag to be detected by only the TabView and not the Dismissible item?
If an explicit solution/example with code snippets can be given, I would very very much appreciate the help!
Here's a paste for your main.dart file:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/semantics.dart';
void main() {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.dark(),
home: MainPage(),
);
}
}
class MainPage extends StatefulWidget {
@override
State<StatefulWidget> createState() => _MainPageState();
}
class _MainPageState extends State<MainPage>
with SingleTickerProviderStateMixin {
TabController _tabController;
@override
void initState() {
_tabController = TabController(vsync: this, length: 2, initialIndex: 1);
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
color: Colors.black,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Expanded(
child: TabBarView(
controller: _tabController,
children: <Widget>[
TabWithSomething(),
TabWithNothing(),
],
),
),
],
),
),
),
);
}
}
class TabWithNothing extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Center(
child: Container(
child: Text("Swipe from left-to-right!"),
),
);
}
}
class TabWithSomethingItem implements Comparable<TabWithSomethingItem> {
TabWithSomethingItem({this.index, this.name, this.subject, this.body});
TabWithSomethingItem.from(TabWithSomethingItem item)
: index = item.index,
name = item.name,
subject = item.subject,
body = item.body;
final int index;
final String name;
final String subject;
final String body;
@override
int compareTo(TabWithSomethingItem other) => index.compareTo(other.index);
}
class TabWithSomething extends StatefulWidget {
const TabWithSomething({Key key}) : super(key: key);
static const String routeName = '/material/leave-behind';
@override
TabWithSomethingState createState() => TabWithSomethingState();
}
class TabWithSomethingState extends State<TabWithSomething> {
List<TabWithSomethingItem> TabWithSomethingItems;
void initListItems() {
TabWithSomethingItems =
List<TabWithSomethingItem>.generate(10, (int index) {
return TabWithSomethingItem(
index: index,
name: 'Item $index',
subject: 'Swipe from left-to-right to delete',
body: "Swipe from right-to-left to go back to old tab");
});
}
@override
void initState() {
super.initState();
initListItems();
}
void _handleDelete(TabWithSomethingItem item) {
setState(() {
TabWithSomethingItems.remove(item);
});
}
@override
Widget build(BuildContext context) {
Widget body;
body = ListView(
children:
TabWithSomethingItems.map<Widget>((TabWithSomethingItem item) {
return _TabWithSomethingListItem(
item: item,
onDelete: _handleDelete,
dismissDirection: DismissDirection.startToEnd,
);
}).toList());
return body;
}
}
class _TabWithSomethingListItem extends StatelessWidget {
const _TabWithSomethingListItem({
Key key,
@required this.item,
@required this.onDelete,
@required this.dismissDirection,
}) : super(key: key);
final TabWithSomethingItem item;
final DismissDirection dismissDirection;
final void Function(TabWithSomethingItem) onDelete;
void _handleDelete() {
onDelete(item);
}
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
return Semantics(
customSemanticsActions: <CustomSemanticsAction, VoidCallback>{
const CustomSemanticsAction(label: 'Delete'): _handleDelete,
},
child: Dismissible(
key: ObjectKey(item),
direction: dismissDirection,
onDismissed: (DismissDirection direction) => _handleDelete(),
background: Container(
color: theme.primaryColor,
child: const ListTile(
leading: Icon(Icons.delete, color: Colors.white, size: 36.0))),
child: Container(
decoration: BoxDecoration(
color: theme.canvasColor,
border: Border(bottom: BorderSide(color: theme.dividerColor))),
child: ListTile(
title: Text(item.name),
subtitle: Text('${item.subject}n${item.body}'),
isThreeLine: true),
),
),
);
}
}
UPDATE:
I'm thinking we could change the "dismissible.dart" file to change the "TabControlller", but i'm not sure how I might do that.
In the "dismissible.dart" file:
...
void _handleDragUpdate(DragUpdateDetails details) {
if (!_isActive || _moveController.isAnimating)
return;
final double delta = details.primaryDelta;
if (delta < 0) print(delta); // thinking of doing something here
...
asked Nov 12 at 0:15
Johnny Boy
956
asked Nov 12 at 0:15
Johnny Boy
956
edited Nov 12 at 19:09
asked Nov 12 at 0:15
Johnny Boy
956
asked Nov 12 at 0:15
Johnny Boy
956
asked Nov 12 at 0:15
Johnny Boy
956
956
add a comment |
add a comment |
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