dart

问题 I am trying to implement bloc pattern in rxdart . I am trying to build todo app type of app . I implemented showing all items in list but what I want is not to show completed and uncompleted items in different part . However I am not able to filter the items based on completed on rxdart . import 'package:rxdart/rxdart.dart'; import '../models/ShoppingItem.dart'; class ShoppingItemBloc { final _shoppingItems = BehaviorSubject<List<ShoppingItem>> (seedValue: []); Observable<List<ShoppingItem>>

问题 I've been building layout with both horizontal and vertical scrolling. Vertical scrollable Column is for main content and is populated by different views, including horizontal ListView which shows promo banners. I wanted to show scrollbar for vertical scrolling, but not for horizontal. I've wrapped the SingleChildScrollView which makes Column scrollable in ScrollBar , but the bar appeared on both vertical on horizontal scrolls. Is there any fine-tuning for these kinds of things? Sample to

问题 I have a program that I get a list of users from Firebase's cloud Firestore, and display them in a Listview using a StreamBuilder in Flutter. The number of users will be large, and I want to implement a search field in my streambuilder that will query results that match my search field. I want it to look like this: --photo credit: https://blog.usejournal.com/flutter-search-in-listview-1ffa40956685 My Streambuilder that looks like the following: StreamBuilder<QuerySnapshot>( stream: Firestore

问题 I am trying to make stack layout scrollable using SingleChildScrollView but it's not scrolling. Is SingleChildScrollView should be used here? I think I have given enough description to make anyone understand my question. More text here to satisfy StackOverflow's requirement to ask a question. Sorry about this. Here's example code. @override Widget build(BuildContext context) { return Scaffold( body: SafeArea( child: Container( child: Center( child: LayoutBuilder( builder: (BuildContext

问题 How do I write a byte array in Dart? I want to implement this function, but it is Java code with byte[] in it. Can it be written in Dart as well? public static byte[] encrypt(byte[] key, byte[] data) throws Exception { try { return performCipher(Cipher.ENCRYPT_MODE, key, data); } catch (Exception e) { throw new Exception(e); } } 回答1: What you are looking for is Uint8List . It is the equivalent of byte[] of Java in Dart. Every single value has an equivalent in another language, so byte[] in a

问题 How do I write a byte array in Dart? I want to implement this function, but it is Java code with byte[] in it. Can it be written in Dart as well? public static byte[] encrypt(byte[] key, byte[] data) throws Exception { try { return performCipher(Cipher.ENCRYPT_MODE, key, data); } catch (Exception e) { throw new Exception(e); } } 回答1: What you are looking for is Uint8List . It is the equivalent of byte[] of Java in Dart. Every single value has an equivalent in another language, so byte[] in a

问题 I'm using DataTable in my recent app and i need to change the color of the row line or make it invisible (i mean I don't want to my table shows any row line) If anyone knows please help! thanks 回答1: Use Theme widget and overriding the dividerColor as shown below. import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: MyHomePage(), ); } } class MyHomePage extends

问题 How can I create libraries using Dart? I want to start porting some JavaScript (and other languages) libraries I've created to Dart. 回答1: Just put this in your library file (first place): library mylibraryname; You can then import this lib with: import "path/to/mylibraryname.dart"; Other options are available, for example part which acts as include. For a more in-depth tutorial I recommend you this blog post from Dartwatch. 回答2: stagehand is the most simply. Usage mkdir fancy_project cd fancy

问题 How can I create libraries using Dart? I want to start porting some JavaScript (and other languages) libraries I've created to Dart. 回答1: Just put this in your library file (first place): library mylibraryname; You can then import this lib with: import "path/to/mylibraryname.dart"; Other options are available, for example part which acts as include. For a more in-depth tutorial I recommend you this blog post from Dartwatch. 回答2: stagehand is the most simply. Usage mkdir fancy_project cd fancy

问题 How can I create libraries using Dart? I want to start porting some JavaScript (and other languages) libraries I've created to Dart. 回答1: Just put this in your library file (first place): library mylibraryname; You can then import this lib with: import "path/to/mylibraryname.dart"; Other options are available, for example part which acts as include. For a more in-depth tutorial I recommend you this blog post from Dartwatch. 回答2: stagehand is the most simply. Usage mkdir fancy_project cd fancy