state

How to add a custom button state

由 只谈情不闲聊 提交于 2019-11-26 09:27:34
For instance, the default button has the following dependencies between its states and background images: <?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_window_focused="false" android:state_enabled="true" android:drawable="@drawable/btn_default_normal" /> <item android:state_window_focused="false" android:state_enabled="false" android:drawable="@drawable/btn_default_normal_disable" /> <item android:state_pressed="true" android:drawable="@drawable/btn_default_pressed" /> <item android:state_focused="true" android

getting error: Cannot read property state of undefined

由 ╄→гoц情女王★ 提交于 2019-11-26 08:35:38
问题 import React, { Component } from \"react\"; import FormUpdate from \"../components/formUpdate\"; import { fetchClothingItem, updateClothingItem } from \"../actions/crud\"; export default class Update extends Component { constructor(props) { super(props); this.state = { updateClothingItem: {} }; } componentWillMount() { fetchClothingItem(this.props.match.params.postId) .then(data => { this.setState(state => { state.updateClothingItem = data; return state; }); console.log(\"data\", data); /

Android : How to update the selector(StateListDrawable) programmatically

由 别说谁变了你拦得住时间么 提交于 2019-11-26 08:07:49
问题 I want to update the selector for a button programmatically. I can do this with the xml file which is given below <?xml version=\"1.0\" encoding=\"UTF-8\"?> <selector xmlns:android=\"http://schemas.android.com/apk/res/android\"> <item android:state_enabled=\"false\" android:drawable=\"@drawable/btn_off\" /> <item android:state_pressed=\"true\" android:state_enabled=\"true\" android:drawable=\"@drawable/btn_off\" /> <item android:state_focused=\"true\" android:state_enabled=\"true\" android

How to implement a FSM - Finite State Machine in Java

由 有些话、适合烂在心里 提交于 2019-11-26 08:00:02
问题 I have something to do for work and I need your help. We want to implement a FSM - Finite State Machine , to identify char sequence(like: A, B, C, A, C), and tell if it accepted. We think to implement three classes: State , Event and Machine . The state class presents a node in the FSM , we thought to implement it with State design pattern , every node will extend from the abstract class state and every class would handle different types of events and indicate transitions to a new state. Is

Android save Checkbox State in ListView with Cursor Adapter

由 a 夏天 提交于 2019-11-26 07:42:46
问题 I cant find a way to save the checkbox state when using a Cursor adapter. Everything else works fine but if i click on a checkbox it is repeated when it is recycled. Ive seen examples using array adapters but because of my lack of experience im finding it hard to translate it into using a cursor adapter. Could someone give me an example of how to go about it. Any help appreciated. private class PostImageAdapter extends CursorAdapter { private static final int s = 0; private int layout; Bitmap

Advantages of stateless programming?

由 妖精的绣舞 提交于 2019-11-26 06:53:28
问题 I\'ve recently been learning about functional programming (specifically Haskell, but I\'ve gone through tutorials on Lisp and Erlang as well). While I found the concepts very enlightening, I still don\'t see the practical side of the \"no side effects\" concept. What are the practical advantages of it? I\'m trying to think in the functional mindset, but there are some situations that just seem overly complex without the ability to save state in an easy way (I don\'t consider Haskell\'s monads

React setState not Updating Immediately

由 无人久伴 提交于 2019-11-26 05:54:22
问题 I\'m working on a todo application. This is a very simplified version of the offending code. I have a checkbox: <p><input type=\"checkbox\" name=\"area\" checked={this.state.Pencil} onChange={this.checkPencil}/> Writing Item </p> Here\'s the function that calls the checkbox: checkPencil(){ this.setState({ pencil:!this.state.pencil, }); this.props.updateItem(this.state); } updateItem is a function that\'s mapped to dispatch to redux function mapDispatchToProps(dispatch){ return

See :hover state in Chrome Developer Tools

由 自闭症网瘾萝莉.ら 提交于 2019-11-26 03:28:51
问题 I want to see the :hover style for an anchor I\'m hovering on in Chrome. In Firebug, there\'s a style dropdown that allows me to select different states for an element. I can\'t seem to find anything similar in Chrome. Am I missing something? 回答1: Now you can see both the psuedo-class rules and force them on elements. To see the rules like :hover in the Styles pane click the small :hov text in the top right. To force an element into :hover state, right click it. Additional tips on the

How to add a custom button state

由 半世苍凉 提交于 2019-11-26 03:25:50
问题 For instance, the default button has the following dependencies between its states and background images: <?xml version=\"1.0\" encoding=\"utf-8\"?> <selector xmlns:android=\"http://schemas.android.com/apk/res/android\"> <item android:state_window_focused=\"false\" android:state_enabled=\"true\" android:drawable=\"@drawable/btn_default_normal\" /> <item android:state_window_focused=\"false\" android:state_enabled=\"false\" android:drawable=\"@drawable/btn_default_normal_disable\" /> <item

Where to write to localStorage in a Redux app?

由 牧云@^-^@ 提交于 2019-11-26 03:02:47
I want to persist some parts of my state tree to the localStorage. What is the appropriate place to do so? Reducer or action? Reducer is never an appropriate place to do this because reducers should be pure and have no side effects. I would recommend just doing it in a subscriber: store.subscribe(() => { // persist your state }) Before creating the store, read those persisted parts: const persistedState = // ... const store = createStore(reducer, persistedState) If you use combineReducers() you’ll notice that reducers that haven’t received the state will “boot up” as normal using their default
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