Flutter

问题 I have a text field in flutter and an emoji picker button. On selecting an emoji I need to insert it at the current cursor position. How can I achieve this? Currently using TextEditingController I'm only able to append the emoji. I'm not able to get the current cursor offset. emojiPicker() { return EmojiPicker( rows: 3, columns: 7, recommendKeywords: null, indicatorColor: flujoAccentColor, onEmojiSelected: (emoji, category) { print(emoji); _messageInputController.text =

问题 I can't find this in the official documentation for the provider package, does streamprovider automatically handle disposing of streams they are providing or do you have to do this manually? If so, what is the best practice of where to dispose a stream exposed using stream provider? 回答1: No, it is not necessary to manually clean up streams when using StreamProvider. StreamProvider extends DeferredInheritedProvider, whose documentation states that the object being listened to will be

问题 I can't find this in the official documentation for the provider package, does streamprovider automatically handle disposing of streams they are providing or do you have to do this manually? If so, what is the best practice of where to dispose a stream exposed using stream provider? 回答1: No, it is not necessary to manually clean up streams when using StreamProvider. StreamProvider extends DeferredInheritedProvider, whose documentation states that the object being listened to will be

问题 I can't find this in the official documentation for the provider package, does streamprovider automatically handle disposing of streams they are providing or do you have to do this manually? If so, what is the best practice of where to dispose a stream exposed using stream provider? 回答1: No, it is not necessary to manually clean up streams when using StreamProvider. StreamProvider extends DeferredInheritedProvider, whose documentation states that the object being listened to will be

问题 Open issue at GitHub I am using HTML/CSS to create PDF views. So, In some cases we need render images from the local asset-folder. When we try to render the file from assets folder image is not displaying. How to resolve this issue? iOS-Screenshot: Full Source Code: RenderHtml.dart import 'package:flutter/material.dart'; import 'dart:async'; import 'dart:io'; import 'package:flutter_full_pdf_viewer/flutter_full_pdf_viewer.dart'; import 'package:flutter_html_to_pdf/flutter_html_to_pdf.dart';

问题 I am a beginner in Dart language development. I try to create a sample flutter application BLOC pattern inspired by this GitHub repo, but I got some error message related to the class inheritance. I am already familiar with the inheritance and superclass and subclass programming in the dot net C# language. But in the case of the dart, I need some advice. Here is my code: class UserRegBloc extends Bloc<UserRegEvent, UserRegState> { UserRepository userRepository; UserRegBloc({@required

问题 I am a beginner in Dart language development. I try to create a sample flutter application BLOC pattern inspired by this GitHub repo, but I got some error message related to the class inheritance. I am already familiar with the inheritance and superclass and subclass programming in the dot net C# language. But in the case of the dart, I need some advice. Here is my code: class UserRegBloc extends Bloc<UserRegEvent, UserRegState> { UserRepository userRepository; UserRegBloc({@required

问题 I have a simple grid, that takes more space than the screen real-state, and can be scrolled up and down. Each cell has an onTap() method that changes the cell color. The problem is that once I scroll the changed cell out of view, the state is not kept. Any ideas? class GridWidget extends StatefulWidget { @override _GridWidgetState createState() => new _GridWidgetState(); } class _GridWidgetState extends State<GridWidget> { @override Widget build(BuildContext context) { Color cellColor =

问题 I develop a flutter app, define serveral models in 'model' package. Then I declare a class Example in 'model' for example. model/example.dart class Example { @override String toString() { return 'class example'; } } test_a.dart import 'package:example/model/example.dart' Example testA() { return Example() } test.dart import 'model/example.dart' import 'test_a.dart' test() { Example example = testA(); if (example is Example) { print('this class is Example'); } else { print('$example'); } } I

问题 I develop a flutter app, define serveral models in 'model' package. Then I declare a class Example in 'model' for example. model/example.dart class Example { @override String toString() { return 'class example'; } } test_a.dart import 'package:example/model/example.dart' Example testA() { return Example() } test.dart import 'model/example.dart' import 'test_a.dart' test() { Example example = testA(); if (example is Example) { print('this class is Example'); } else { print('$example'); } } I