dart

问题 I need to implement scrolling bars in form. This is for web users by clicking on scrolling bar, they can navigate. Scrollbar class in flutter works for touch device, but not with mouse based input. I've tried using "draggable_scrollbar" library from pub.dev, however it only accepts ListView as child. My code: Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('My form'), ), body: Padding( padding: const EdgeInsets.all(16.0), child: Scrollbar( child:

问题 I need to implement scrolling bars in form. This is for web users by clicking on scrolling bar, they can navigate. Scrollbar class in flutter works for touch device, but not with mouse based input. I've tried using "draggable_scrollbar" library from pub.dev, however it only accepts ListView as child. My code: Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('My form'), ), body: Padding( padding: const EdgeInsets.all(16.0), child: Scrollbar( child:

问题 I'm trying to understand Streams and wrote some code. Everything seems to work, the program exits with status code 0. But it doesn't print the 'loop done' and 'main done' strings. I can't figure out why. import 'dart:async'; Stream<int> countStream(int to) async* { for (int i = 1; i <= to; i++) { yield i; } } class Retry { StreamController<int> _outgoing; Retry(Stream<int> incoming) { _outgoing = StreamController<int>(); _outgoing.addStream(incoming); } Future<void> process() async { await

问题 ListTile OnTap is working when I use ListView. But when i use ListWheelScrollView it doesn't work. I mean it doesn't get tapped. The view changes. But i can't seem to tap it. I looked for the solution in a lot of places and links but still couldn't find the solutions. These are the code I did. @override Widget build(BuildContext context) { return new ListWheelScrollView( physics:FixedExtentScrollPhysics(), children: getPostList(), itemExtent: 100.0, ); } List<PostListItem> getPostList() {

问题 This is about Flutter Firebase Authentication plugin. I am trying to send a verification email after creating a new user, but sendEmailVerification() internally uses currentUser(). This looks like a bug to me, but just in case, I am posting a question to stackoverflow. The error is the same on Android and IOS. First two lines return FirebaseUser. The third returns null. Forth, if third is commented throws a null reference error. Thanks, Boris user = await _auth.createUserWithEmailAndPassword

问题 This is about Flutter Firebase Authentication plugin. I am trying to send a verification email after creating a new user, but sendEmailVerification() internally uses currentUser(). This looks like a bug to me, but just in case, I am posting a question to stackoverflow. The error is the same on Android and IOS. First two lines return FirebaseUser. The third returns null. Forth, if third is commented throws a null reference error. Thanks, Boris user = await _auth.createUserWithEmailAndPassword

问题 ListTile OnTap is working when I use ListView. But when i use ListWheelScrollView it doesn't work. I mean it doesn't get tapped. The view changes. But i can't seem to tap it. I looked for the solution in a lot of places and links but still couldn't find the solutions. These are the code I did. @override Widget build(BuildContext context) { return new ListWheelScrollView( physics:FixedExtentScrollPhysics(), children: getPostList(), itemExtent: 100.0, ); } List<PostListItem> getPostList() {

问题 ListTile OnTap is working when I use ListView. But when i use ListWheelScrollView it doesn't work. I mean it doesn't get tapped. The view changes. But i can't seem to tap it. I looked for the solution in a lot of places and links but still couldn't find the solutions. These are the code I did. @override Widget build(BuildContext context) { return new ListWheelScrollView( physics:FixedExtentScrollPhysics(), children: getPostList(), itemExtent: 100.0, ); } List<PostListItem> getPostList() {

问题 I'm trying to understand Streams and wrote some code. Everything seems to work, the program exits with status code 0. But it doesn't print the 'loop done' and 'main done' strings. I can't figure out why. import 'dart:async'; Stream<int> countStream(int to) async* { for (int i = 1; i <= to; i++) { yield i; } } class Retry { StreamController<int> _outgoing; Retry(Stream<int> incoming) { _outgoing = StreamController<int>(); _outgoing.addStream(incoming); } Future<void> process() async { await

问题 I'm trying to understand Streams and wrote some code. Everything seems to work, the program exits with status code 0. But it doesn't print the 'loop done' and 'main done' strings. I can't figure out why. import 'dart:async'; Stream<int> countStream(int to) async* { for (int i = 1; i <= to; i++) { yield i; } } class Retry { StreamController<int> _outgoing; Retry(Stream<int> incoming) { _outgoing = StreamController<int>(); _outgoing.addStream(incoming); } Future<void> process() async { await