state-management

问题 I have a class ViewTotalItemProvider which extends the ChangeNotifier. Inside the class, there is a list like this. class ViewTotalItemProvider extends ChangeNotifier{ List<CartPlantLists> cartPlantList3 = []; } Additionally, there are 3 screens including class like, PlantFeatureScreen1 , ParticularPlant2 , CartDetais3 . All are stateful widget and I am adding some items in second screen i.e. ParticularPlant2 class. When I try to show the items from list in the second screen and the third

问题 in my Flutter app I want to display multiple items inside a listView and I want to handle their state using Provider. but how can I handle the state in a way that if I edit one item in the listview only that item get rebuild. and the entire listview get rebuild only when I change the number of items either by adding or deleting. how can I do this 回答1: This is a working solution that is very close to what you want (It still rebuilds the whole ListView when one item is edited but have no

问题 guys, I'm starting with flutter and I decided to make a mini game like "cookie clicker" to train but I've just run into a problem with the state management... I use a provider to propagate the "GameController" which aims to update the player's resources and do the calculations. I manage to get the "GameController" everywhere but when I interact with a resource (object in the "GameController") and this one is up to date but not in the UI, it doesn't change... main.dart : import 'package

问题 Take this finite-state machine: { initial: "foo", states: { foo: { on: { BAR: "bar" } }, bar: { on: { FOO: "foo" } } } } And in my component, I do this: import { useMachine } from "@xstate/react"; export default function() { const [current, send] = useMachine(machine); useEffect(() => { send("BAR"); }, []); return ( <> Hello World </> ); } This is perfectly valid code and the machine will switch to the "bar" state. Now, what happens if I do this? useEffect(() => { send("QUX"); }, []); The QUX

问题 Take this finite-state machine: { initial: "foo", states: { foo: { on: { BAR: "bar" } }, bar: { on: { FOO: "foo" } } } } And in my component, I do this: import { useMachine } from "@xstate/react"; export default function() { const [current, send] = useMachine(machine); useEffect(() => { send("BAR"); }, []); return ( <> Hello World </> ); } This is perfectly valid code and the machine will switch to the "bar" state. Now, what happens if I do this? useEffect(() => { send("QUX"); }, []); The QUX

问题 Take this finite-state machine: { initial: "foo", states: { foo: { on: { BAR: "bar" } }, bar: { on: { FOO: "foo" } } } } And in my component, I do this: import { useMachine } from "@xstate/react"; export default function() { const [current, send] = useMachine(machine); useEffect(() => { send("BAR"); }, []); return ( <> Hello World </> ); } This is perfectly valid code and the machine will switch to the "bar" state. Now, what happens if I do this? useEffect(() => { send("QUX"); }, []); The QUX

问题 I have two BLoCs. EstateBloc EstateTryBloc My Application basically gets estates from an API and displays them in a similar fashion Now I wanted to add a sort functionality, but I could only access the List of Estates via a specific state. if(currentState is PostLoadedState){{ print(currentState.estates); } I wanted to make the List of estates available for whichever bloc, that needed that list. What I did was, I created the EstateTryBloc, which basically contains the List of estates as a

问题 I am using BotBuilder SDK v4. Here is the explanation below (ignoring some extra code). On my bot's OnTurnAsync I am calling one of my dialog like so. public async Task OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken = default(CancellationToken)) { var state = await _accessors.TurnStateAccessor.GetAsync(turnContext, () => new TurnState()).ConfigureAwait(false); var dialogContext = await _dialogs.CreateContextAsync(turnContext).ConfigureAwait(false); await

问题 I started a project based on LitElement There are many components nested in each other, Let us say we have this structure: the root component is my-app import { LitElement, html, customElement, query } from 'lit-element'; import './my-form'; import './my-view'; import { MyView } from './my-view'; @customElement('my-app') export class MyApp extends LitElement { @query('my-view') private myView?: MyView; private handleCountChange(e: CustomEvent<{ count: number }>) { if (!this.myView) throw 'my

问题 I am using NGXS for a while and found that if you use an object or array in @Select return it can break the immutability of the sate in the component. Example: state: AppStateModel = { justValue: true, complexObject: { a:1, b:2} } and then two selectors: // Here in a component we will get access to object by link and can modify it in state without patchState or setState @Selector() static getComplexObject(state: AppStateModel) { return state.complexObject; } // That will work fine since JS