source stringlengths 14 113 | code stringlengths 10 21.3k |
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application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ComponentV2
struct Comp {
@Trace message: string = "Hello World"; // Incorrect usage. An error is reported at compile time.
build() {
}
} |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @Observed
class User {
@Trace name: string = "Tom"; // Incorrect usage. An error is reported at compile time.
}
@ObservedV2
class Person {
@Track name: string = "Jack"; // Incorrect usage. An error is reported at compile time.
} |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | // @State is used as an example.
@ObservedV2
class Job {
@Trace jobName: string = "Teacher";
}
@ObservedV2
class Info {
@Trace name: string = "Tom";
@Trace age: number = 25;
job: Job = new Job();
}
@Entry
@Component
struct Index {
@State info: Info = new Info(); // As @State is not allowed here, an error is r... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | // @State is used as an example.
@ObservedV2
class Job {
@Trace jobName: string = "Teacher";
}
@ObservedV2
class Info {
@Trace name: string = "Tom";
@Trace age: number = 25;
job: Job = new Job();
}
class Message extends Info {
constructor() {
super();
}
}
@Entry
@Component
struct Index {
@Stat... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Pencil {
@Trace length: number = 21; // If length changes, the bound component is re-rendered.
}
class Bag {
width: number = 50;
height: number = 60;
pencil: Pencil = new Pencil();
}
class Son {
age: number = 5;
school: string = "some";
bag: Bag = new Bag();
}
@Entry
@ComponentV2
struct... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class GrandFather {
@Trace age: number = 0;
constructor(age: number) {
this.age = age;
}
}
class Father extends GrandFather{
constructor(father: number) {
super(father);
}
}
class Uncle extends GrandFather {
constructor(uncle: number) {
super(uncle);
}
}
class Son extends Father {... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | let nextId: number = 0;
@ObservedV2
class Arr {
id: number = 0;
@Trace numberArr: number[] = [];
constructor() {
this.id = nextId++;
this.numberArr = [0, 1, 2];
}
}
@Entry
@ComponentV2
struct Index {
arr: Arr = new Arr();
build() {
Column() {
Text(`length: ${this.arr.numberArr.length}`... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | let nextId: number = 0;
@ObservedV2
class Person {
@Trace age: number = 0;
constructor(age: number) {
this.age = age;
}
}
@ObservedV2
class Info {
id: number = 0;
@Trace personList: Person[] = [];
constructor() {
this.id = nextId++;
this.personList = [new Person(0), new Person(1), new Person... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Info {
@Trace memberMap: Map<number, string> = new Map([[0, "a"], [1, "b"], [3, "c"]]);
}
@Entry
@ComponentV2
struct MapSample {
info: Info = new Info();
build() {
Row() {
Column() {
ForEach(Array.from(this.info.memberMap.entries()), (item: [number, string]) => {
Te... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Info {
@Trace memberSet: Set<number> = new Set([0, 1, 2, 3, 4]);
}
@Entry
@ComponentV2
struct SetSample {
info: Info = new Info();
build() {
Row() {
Column() {
ForEach(Array.from(this.info.memberSet.entries()), (item: [number, string]) => {
Text(`${item[0]}`)
... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Info {
@Trace selectedDate: Date = new Date('2021-08-08')
}
@Entry
@ComponentV2
struct DateSample {
info: Info = new Info()
build() {
Column() {
Button('set selectedDate to 2023-07-08')
.margin(10)
.onClick(() => {
this.info.selectedDate = new Date('2023-07-... |
application-dev\ui\state-management\arkts-new-once.md | @ComponentV2
struct MyComponent {
@Param @Once onceParam: string = "onceParam"; // Correct usage.
@Once onceStr: string = "Once"; // Incorrect usage. @Once cannot be used independently.
@Local @Once onceLocal: string = "onceLocal"; // Incorrect usage. @Once cannot be used with @Local.
}
@Component
s... |
application-dev\ui\state-management\arkts-new-once.md | @ComponentV2
struct MyComponent {
@Param @Once param1: number;
@Once @Param param2: number;
} |
application-dev\ui\state-management\arkts-new-once.md | @ComponentV2
struct ChildComponent {
@Param @Once onceParam: string = "";
build() {
Column() {
Text(`onceParam: ${this.onceParam}`)
}
}
}
@Entry
@ComponentV2
struct MyComponent {
@Local message: string = "Hello World";
build() {
Column() {
Text(`Parent message: ${this.message}`)
Butt... |
application-dev\ui\state-management\arkts-new-once.md | @ObservedV2
class Info {
@Trace name: string;
constructor(name: string) {
this.name = name;
}
}
@ComponentV2
struct Child {
@Param @Once onceParamNum: number = 0;
@Param @Once @Require onceParamInfo: Info;
build() {
Column() {
Text(`Child onceParamNum: ${this.onceParamNum}`)
Text(`Child... |
application-dev\ui\state-management\arkts-new-param.md | @Observed
class Region {
x: number;
y: number;
constructor(x: number, y: number) {
this.x = x;
this.y = y;
}
}
@Observed
class Info {
region: Region;
constructor(x: number, y: number) {
this.region = new Region(x, y);
}
}
@Entry
@Component
struct Index {
@State info: Info = new Info(0, 0);
... |
application-dev\ui\state-management\arkts-new-param.md | @Entry
@ComponentV2
struct Index {
@Local count: number = 0;
@Local message: string = "Hello";
@Local flag: boolean = false;
build() {
Column() {
Text(`Local ${this.count}`)
Text(`Local ${this.message}`)
Text(`Local ${this.flag}`)
Button("change Local")
... |
application-dev\ui\state-management\arkts-new-param.md | class RawObject {
name: string;
constructor(name: string) {
this.name = name;
}
}
@ObservedV2
class ObservedObject {
@Trace name: string;
constructor(name: string) {
this.name = name;
}
}
@Entry
@ComponentV2
struct Index {
@Local rawObject: RawObject = new RawObject... |
application-dev\ui\state-management\arkts-new-param.md | @Entry
@ComponentV2
struct Index {
@Local numArr: number[] = [1,2,3,4,5];
@Local dimensionTwo: number[][] = [[1,2,3],[4,5,6]];
build() {
Column() {
Text(`${this.numArr[0]}`)
Text(`${this.numArr[1]}`)
Text(`${this.numArr[2]}`)
Text(`${this.dimensionTwo[0][0]}`)
... |
application-dev\ui\state-management\arkts-new-param.md | @ObservedV2
class Region {
@Trace x: number;
@Trace y: number;
constructor(x: number, y: number) {
this.x = x;
this.y = y;
}
}
@ObservedV2
class Info {
@Trace region: Region;
@Trace name: string;
constructor(name: string, x: number, y: number) {
this.name = name;
... |
application-dev\ui\state-management\arkts-new-param.md | @ComponentV2
struct MyComponent {
@Param message: string = "Hello World"; // Correct usage.
build() {
}
}
@Component
struct TestComponent {
@Param message: string = "Hello World"; // Incorrect usage. An error is reported during compilation.
build() {
}
} |
application-dev\ui\state-management\arkts-new-param.md | @ComponentV2
struct ChildComponent {
@Param param1: string = "Initialize local";
@Param param2: string = "Initialize local and put in";
@Require @Param param3: string;
@Param param4: string; // Incorrect usage. The external initialization is not performed and no initial value exists in the local host.... |
application-dev\ui\state-management\arkts-new-param.md | @ObservedV2
class Info {
@Trace name: string;
constructor(name: string) {
this.name = name;
}
}
@Entry
@ComponentV2
struct Index {
@Local info: Info = new Info("Tom");
build() {
Column() {
Text(`Parent info.name ${this.info.name}`)
Button("Parent change info")
... |
application-dev\ui\state-management\arkts-new-param.md | @ObservedV2
class Region {
@Trace x: number;
@Trace y: number;
constructor(x: number, y: number) {
this.x = x;
this.y = y;
}
}
@ObservedV2
class Info {
@Trace name: string;
@Trace age: number;
@Trace region: Region;
constructor(name: string, age: number, x: number, y: number) {
this.name = n... |
application-dev\ui\state-management\arkts-new-param.md | @ComponentV2
struct DateComponent {
@Param selectedDate: Date = new Date('2024-01-01');
build() {
Column() {
DatePicker({
start: new Date('1970-1-1'),
end: new Date('2100-1-1'),
selected: this.selectedDate
})
}
}
}
@Entry
@ComponentV2
struct ParentComponent {
@Local... |
application-dev\ui\state-management\arkts-new-param.md | @ComponentV2
struct Child {
@Param value: Map<number, string> = new Map()
build() {
Column() {
ForEach(Array.from(this.value.entries()), (item: [number, string]) => {
Text(`${item[0]}`).fontSize(30)
Text(`${item[1]}`).fontSize(30)
Divider()
})
}
}
}
@Entry
@ComponentV2... |
application-dev\ui\state-management\arkts-new-param.md | @ComponentV2
struct Child {
@Param message: Set<number> = new Set()
build() {
Column() {
ForEach(Array.from(this.message.entries()), (item: [number, string]) => {
Text(`${item[0]}`).fontSize(30)
Divider()
})
}
.width('100%')
}
}
@Entry
@ComponentV2
struct SetSample11 {
@... |
application-dev\ui\state-management\arkts-new-param.md | @Entry
@ComponentV2
struct Index {
@Local count: number | undefined = 0;
build() {
Column() {
MyComponent({ count: this.count })
Button('change')
.onClick(() => {
this.count = undefined;
})
}
}
}
@ComponentV2
struct MyComponent {
@Param count: number | undefined =... |
application-dev\ui\state-management\arkts-new-persistencev2.md | // globalConnect API
static globalConnect<T extends object>(
type: ConnectOptions<T>
): T | undefined; |
application-dev\ui\state-management\arkts-new-persistencev2.md | // ConnectOptions parameters
class ConnectOptions<T extends object> {
type: TypeConstructorWithArgs<T>; // (Mandatory) Specified type.
key?: string; // (Optional) Input key. If no key is specified, the name of the type is used as the key.
defaultCreator?: StorageDefaultCreator<T> // Default constructor. You are a... |
application-dev\ui\state-management\arkts-new-persistencev2.md | static remove<T>(keyOrType: string | TypeConstructorWithArgs<T>): void; |
application-dev\ui\state-management\arkts-new-persistencev2.md | static keys(): Array<string>; |
application-dev\ui\state-management\arkts-new-persistencev2.md | static save<T>(keyOrType: string | TypeConstructorWithArgs<T>): void; |
application-dev\ui\state-management\arkts-new-persistencev2.md | static notifyOnError(callback: PersistenceErrorCallback | undefined): void; |
application-dev\ui\state-management\arkts-new-persistencev2.md | // Sample.ets
import { Type } from '@kit.ArkUI';
// Data center
@ObservedV2
class SampleChild {
@Trace p1: number = 0;
p2: number = 10;
}
@ObservedV2
export class Sample {
// Complex objects need to be decorated by @Type to ensure successful serialization.
@Type(SampleChild)
@Trace f: SampleChild = new Samp... |
application-dev\ui\state-management\arkts-new-persistencev2.md | // Page1.ets
import { PersistenceV2 } from '@kit.ArkUI';
import { Sample } from '../Sample';
// Callback used to receive serialization failure.
PersistenceV2.notifyOnError((key: string, reason: string, msg: string) => {
console.error(`error key: ${key}, reason: ${reason}, message: ${msg}`);
});
@Entry
@ComponentV2
... |
application-dev\ui\state-management\arkts-new-persistencev2.md | // Page2.ets
import { PersistenceV2 } from '@kit.ArkUI';
import { Sample } from '../Sample';
@Builder
export function Page2Builder() {
Page2()
}
@ComponentV2
struct Page2 {
// Create a KV pair whose key is Sample in PersistenceV2 (if the key exists, the data in PersistenceV2 is returned) and associate it with pro... |
application-dev\ui\state-management\arkts-new-persistencev2.md | import { PersistenceV2, Type, ConnectOptions } from '@kit.ArkUI';
import { contextConstant } from '@kit.AbilityKit';
// Callback used to receive serialization failure.
PersistenceV2.notifyOnError((key: string, reason: string, msg: string) => {
console.error(`error key: ${key}, reason: ${reason}, message: ${msg}`);
}... |
application-dev\ui\state-management\arkts-new-persistencev2.md | // Module 1
import { PersistenceV2, Type } from '@kit.ArkUI';
import { contextConstant, common, Want } from '@kit.AbilityKit';
// Callback used to receive serialization failure.
PersistenceV2.notifyOnError((key: string, reason: string, msg: string) => {
console.error(`error key: ${key}, reason: ${reason}, message: $... |
application-dev\ui\state-management\arkts-new-persistencev2.md | // Module 2
import { PersistenceV2, Type } from '@kit.ArkUI';
import { contextConstant } from '@kit.AbilityKit';
// Callback used to receive serialization failure.
PersistenceV2.notifyOnError((key: string, reason: string, msg: string) => {
console.error(`error key: ${key}, reason: ${reason}, message: ${msg}`);
});
... |
application-dev\ui\state-management\arkts-new-persistencev2.md | // Use connect to store data.
import { PersistenceV2, Type } from '@kit.ArkUI';
// Callback used to receive serialization failure.
PersistenceV2.notifyOnError((key: string, reason: string, msg: string) => {
console.error(`error key: ${key}, reason: ${reason}, message: ${msg}`);
});
@ObservedV2
class SampleChild {
... |
application-dev\ui\state-management\arkts-new-persistencev2.md | // Migrate to GlobalConnect.
import { PersistenceV2, Type } from '@kit.ArkUI';
// Callback used to receive serialization failure.
PersistenceV2.notifyOnError((key: string, reason: string, msg: string) => {
console.error(`error key: ${key}, reason: ${reason}, message: ${msg}`);
});
@ObservedV2
class SampleChild {
... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @ComponentV2
struct Parent {
// The aliasName is not defined. Use the property name "str" as the aliasName.
@Provider() str: string = 'hello';
}
@ComponentV2
struct Child {
// Define aliasName as"str" and use it to search.
// If the value can be found on the Parent component, use the value "hello" of @Provider... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @ComponentV2
struct Parent {
// Define aliasName as "alias".
@Provider('alias') str: string = 'hello';
}
@ComponentV2 struct Child {
// Define aliasName as "alias", find out @Provider, and obtain the value "hello".
@Consumer('alias') str: string = 'world';
} |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @ComponentV2
struct Parent {
// Define aliasName as "alias".
@Provider('alias') str: string = 'hello';
}
@ComponentV2
struct Child {
// The aliasName is not defined. Use the property name "str" as the aliasName.
// The corresponding @Provider is not found, use the local value "world".
@Consumer() str: string... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @Entry
@ComponentV2
struct Parent {
@Provider() str: string = 'hello';
build() {
Column() {
Button(this.str)
.onClick(() => {
this.str += '0';
})
Child()
}
}
}
@ComponentV2
struct Child {
@Consumer() str: string = 'world';
build() {
Column() {
Button(... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @Entry
@ComponentV2
struct Parent {
@Provider() str1: string = 'hello';
build() {
Column() {
Button(this.str1)
.onClick(() => {
this.str1 += '0';
})
Child()
}
}
}
@ComponentV2
struct Child {
@Consumer() str: string = 'world';
build() {
Column() {
Butt... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @Entry
@ComponentV2
struct Parent {
@Local childX: number = 0;
@Local childY: number = 1;
@Provider() onDrag: (x: number, y: number) => void = (x: number, y: number) => {
console.log(`onDrag event at x=${x} y:${y}`);
this.childX = x;
this.childY = y;
}
build() {
Column() {
Text(`child p... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @ObservedV2
class User {
@Trace name: string;
@Trace age: number;
constructor(name: string, age: number) {
this.name = name;
this.age = age;
}
}
const data: User[] = [new User('Json', 10), new User('Eric', 15)];
@Entry
@ComponentV2
struct Parent {
@Provider('data') users: User[] = data;
build() {
... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @Entry
@ComponentV2
struct Index {
@Provider() val: number = 10;
build() {
Column() {
Parent()
}
}
}
@ComponentV2
struct Parent {
@Provider() val: number = 20;
@Consumer("val") val2: number = 0; // 10
build() {
Column() {
Text(`${this.val2}`)
Child()
}
}
}
@ComponentV... |
application-dev\ui\state-management\arkts-new-Provider-and-Consumer.md | @Entry
@ComponentV2
struct Index {
@Provider() val: number = 10;
build() {
Column() {
Parent({ val2: this.val })
}
}
}
@ComponentV2
struct Parent {
@Consumer() val: number = 0;
@Param val2: number = 0;
build() {
Column() {
Text(`Parent @Consumer val: ${this.val}`).fontSize(30).onC... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | // Use the virtualScroll mode in the List container component.
@Entry
@ComponentV2 // The decorator of V2 is recommended.
struct RepeatExample {
@Local dataArr: Array<string> = []; // Data source
aboutToAppear(): void {
for (let i = 0; i < 50; i++) {
this.dataArr.push(`data_${i}`); // Add data to the arr... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @Entry
@ComponentV2
struct Parent {
@Local simpleList: Array<string> = ['one', 'two', 'three'];
build() {
Row() {
Column() {
Text('Click to change the value of the third array item')
.fontSize(24)
.fontColor(Color.Red)
.onClick(() => {
this.simpleList[2] ... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @Entry
@ComponentV2
struct Parent {
@Local simpleList: Array<string> = ['one', 'two', 'three'];
build() {
Row() {
Column() {
Text('Exchange array items 1 and 2')
.fontSize(24)
.fontColor(Color.Red)
.onClick(() => {
let temp: string = this.simpleList[2]
... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @ObservedV2
class Repeat005Clazz {
@Trace message: string = '';
constructor(message: string) {
this.message = message;
}
}
@Entry
@ComponentV2
struct RepeatVirtualScroll {
@Local simpleList: Array<Repeat005Clazz> = [];
private exchange: number[] = [];
private counter: number = 0;
@Local selectOption... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @ObservedV2
class Repeat006Clazz {
@Trace message: string = '';
constructor(message: string) {
this.message = message;
}
}
@Entry
@ComponentV2
struct RepeatVirtualScroll2T {
@Local simpleList: Array<Repeat006Clazz> = [];
private exchange: number[] = [];
private counter: number = 0;
@Local selectOpti... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @Entry
@ComponentV2
struct RepeatLazyLoading {
// Assume that the total length of the data source is 1000. The initial array does not provide data.
@Local arr: Array<string> = [];
scroller: Scroller = new Scroller();
build() {
Column({ space: 5 }) {
// The initial index displayed on the screen is 100.... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @Entry
@ComponentV2
struct RepeatLazyLoading {
@Local arr: Array<string> = [];
build() {
Column({ space: 5 }) {
List({ space: 5 }) {
Repeat(this.arr)
.virtualScroll({
onTotalCount: () => { return 100; },
// Implement lazy loading.
onLazyLoading: (index... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @Entry
@ComponentV2
struct RepeatLazyLoading {
@Local arr: Array<string> = [];
// Provide the initial data required for the first screen display.
aboutToAppear(): void {
for (let i = 0; i < 15; i++) {
this.arr.push(i.toString());
}
}
build() {
Column({ space: 5 }) {
List({ space: 5 }) ... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | // Repeat can be nested in other components.
@Entry
@ComponentV2
struct RepeatNest {
@Local outerList: string[] = [];
@Local innerList: number[] = [];
aboutToAppear(): void {
for (let i = 0; i < 20; i++) {
this.outerList.push(i.toString());
this.innerList.push(i);
}
}
build() {
Colum... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | class DemoListItemInfo {
name: string;
icon: Resource;
constructor(name: string, icon: Resource) {
this.name = name;
this.icon = icon;
}
}
@Entry
@ComponentV2
struct DemoList {
@Local videoList: Array<DemoListItemInfo> = [];
aboutToAppear(): void {
for (let i = 0; i < 10; i++) {
// app.... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | class DemoGridItemInfo {
name: string;
icon: Resource;
constructor(name: string, icon: Resource) {
this.name = name;
this.icon = icon;
}
}
@Entry
@ComponentV2
struct DemoGrid {
@Local itemList: Array<DemoGridItemInfo> = [];
@Local isRefreshing: boolean = false;
private layoutOptions: GridLayoutO... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | const remotePictures: Array<string> = [
'https://www.example.com/xxx/0001.jpg', // Set the specific network image address.
'https://www.example.com/xxx/0002.jpg',
'https://www.example.com/xxx/0003.jpg',
'https://www.example.com/xxx/0004.jpg',
'https://www.example.com/xxx/0005.jpg',
'https://www.example.com/... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @Entry
@ComponentV2
struct RepeatVirtualScrollOnMove {
@Local simpleList: Array<string> = [];
aboutToAppear(): void {
for (let i = 0; i < 100; i++) {
this.simpleList.push(`${i}`);
}
}
build() {
Column() {
List() {
Repeat<string>(this.simpleList)
// Set onMove to enabl... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @ObservedV2
class RepeatData {
@Trace id: string;
@Trace msg: string;
constructor(id: string, msg: string) {
this.id = id;
this.msg = msg;
}
}
@Entry
@ComponentV2
struct RepeatRerender {
@Local dataArr: Array<RepeatData> = [];
aboutToAppear(): void {
for (let i = 0; i < 10; i++) {
this.... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @ObservedV2
class RepeatData {
@Trace id: string;
@Trace msg: string;
constructor(id: string, msg: string) {
this.id = id;
this.msg = msg;
}
}
@Entry
@ComponentV2
struct RepeatRerender {
@Local dataArr: Array<RepeatData> = [];
aboutToAppear(): void {
for (let i = 0; i < 10; i++) {
this.... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | // Define a class and mark it as observable.
// Customize an array in the class and mark it as traceable.
@ObservedV2
class ArrayHolder {
@Trace arr: Array<number> = [];
// constructor, used to initialize arrays.
constructor(count: number) {
for (let i = 0; i < count; i++) {
this.arr.push(i);
}
}... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | // The definition of ArrayHolder is the same as that in the demo code.
@Entry
@ComponentV2
struct RepeatTemplateSingle {
@Local arrayHolder: ArrayHolder = new ArrayHolder(100);
@Local totalCount: number = this.arrayHolder.arr.length;
scroller: Scroller = new Scroller();
private start: number = 1;
private en... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @ObservedV2
class VehicleData {
@Trace name: string;
@Trace price: number;
constructor(name: string, price: number) {
this.name = name;
this.price = price;
}
}
@ObservedV2
class VehicleDB {
public vehicleItems: VehicleData[] = [];
constructor() {
// The initial size of the array is 20.
fo... |
application-dev\ui\state-management\arkts-new-rendering-control-repeat.md | @Entry
@ComponentV2
struct RepeatBuilderPage {
@Local simpleList1: Array<number> = [];
@Local simpleList2: Array<number> = [];
aboutToAppear(): void {
for (let i = 0; i < 100; i++) {
this.simpleList1.push(i)
this.simpleList2.push(i)
}
}
build() {
Column({ space: 20 }) {
Text('U... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @ReusableV2 // Decorates @ComponentV2 decorated custom components.
@ComponentV2
struct ReusableV2Component {
@Local message: string = 'Hello World';
build () {
Column() {
Text(this.message)
}
}
} |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
build() {
Column() {
ReusableV2Component()
.reuse({reuseId: () => 'reuseComponent'}) // Use 'reuseComponent' as reuseId.
ReusableV2Component()
.reuse({reuseId: () => ''}) // If an empty string is used, the component name 'ReusableV2Component' is used ... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
build() {
Column() {
ReusableV2Component() // Correct usage.
V1Component()
}
}
}
@ReusableV2
@ComponentV2
struct ReusableV2Component {
build() {
}
}
@Builder
function V2ReusableBuilder() {
ReusableV2Component()
}
@C... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
@Local arr: number[] = [1, 2, 3, 4, 5];
build() {
Column() {
List() {
Repeat(this.arr)
.each(() => {})
.virtualScroll()
.templateId(() => 'a')
.template('a', (ri) => {
ListItem() {
... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
@Local condition1: boolean = false;
@Local condition2: boolean = true;
build() {
Column() {
Button('step1. appear')
.onClick(() => {
this.condition1 = true;
})
Button('step2. recycle')
.onClick(() => {
this.condition2... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @ObservedV2
class Info {
@Trace age: number = 25;
}
const info: Info = new Info();
@Entry
@ComponentV2
struct Index {
@Local condition: boolean = true;
build() {
Column() {
Button('Reuse/Recycle').onClick(()=>{this.condition=!this.condition;})
Button('Change value').onClick(()=>{info.age++;})
... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @ObservedV2
class Info {
@Trace age: number;
constructor(age: number) {
this.age = age;
}
}
@Entry
@ComponentV2
struct Index {
@Local local: number = 0;
@Provider('inherit') inheritProvider: number = 100;
@Local condition: boolean = true;
build() {
Column() {
Button('Recycle/Reuse').onClick(... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @ObservedV2
class Info {
@Trace age: number;
constructor(age: number) {
this.age = age;
}
}
@Entry
@ComponentV2
struct Index {
@Local condition: boolean = true;
build() {
Column() {
Button('Recycle/Reuse').onClick(()=>{this.condition=!this.condition;})
if (this.condition) {
Reusabl... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
@Local condition: boolean = true;
build() {
Column() {
Button('Recycle/Reuse').onClick(()=>{this.condition=!this.condition;}) // Click to switch the recycle/reuse state.
if (this.condition) {
ReusableV2Component()
}
}
}
}
@ReusableV2
@ComponentV... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
@Local simpleList: number[] = [1, 2, 3, 4, 5];
@Local condition: boolean = true;
build() {
Column() {
Button('Delete/Create Repeat').onClick(()=>{this.condition=!this.condition;})
Button('Add element').onClick(()=>{this.simpleList.push(this.simpleList.length+1);}... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
@Local condition: boolean = true;
@Local simpleList: number[] = [];
aboutToAppear(): void {
for (let i = 0; i < 100; i++) {
this.simpleList.push(i)
}
}
build() {
Column() {
Button('Change condition').onClick(()=>{this.condition=!this.condition;})
... |
application-dev\ui\state-management\arkts-new-reusableV2.md | @Entry
@ComponentV2
struct Index {
@Local simpleList: number[] = [0, 1, 2, 3, 4, 5];
build() {
Column() {
ForEach(this.simpleList, (num: number, index) => {
Row() {
Button('Click to change').onClick (()=>{this.simpleList[index]++;})
ReusableV2Component({ num: num })
}
... |
application-dev\ui\state-management\arkts-new-reusableV2.md | class BasicDataSource implements IDataSource {
private listeners: DataChangeListener[] = [];
private originDataArray: StringData[] = [];
public totalCount(): number {
return 0;
}
public getData(index: number): StringData {
return this.originDataArray[index];
}
registerDataChangeListener(listene... |
application-dev\ui\state-management\arkts-new-type.md | class Sample {
data: number = 0;
}
@ObservedV2
class Info {
@Type(Sample)
@Trace sample: Sample = new Sample(); // Correct usage.
}
@Observed
class Info2 {
@Type(Sample)
sample: Sample = new Sample(); // Incorrect usage. @Type cannot be used in the @Observed decorated class. Otherwise, an error is reported du... |
application-dev\ui\state-management\arkts-new-type.md | import { Type } from '@kit.ArkUI';
// Data center
@ObservedV2
class SampleChild {
@Trace p1: number = 0;
p2: number = 10;
}
@ObservedV2
export class Sample {
// Complex objects need to be decorated by @Type to ensure successful serialization.
@Type(SampleChild)
@Trace f: SampleChild = new SampleChild();
} |
application-dev\ui\state-management\arkts-new-type.md | import { PersistenceV2 } from '@kit.ArkUI';
import { Sample } from '../Sample';
@Entry
@ComponentV2
struct Page {
prop: Sample = PersistenceV2.connect(Sample, () => new Sample())!;
build() {
Column() {
Text(`Page1 add 1 to prop.p1: ${this.prop.f.p1}`)
.fontSize(30)
.onClick(() => {
... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | // Allowed: assigning a value to a property of an @ObjectLink decorated variable
this.objLink.a= ...
// Not allowed: assigning a new value to the @ObjectLink decorated variable itself
this.objLink= ... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | class Child {
public num: number;
constructor(num: number) {
this.num = num;
}
}
@Observed
class Parent {
public child: Child;
public count: number;
constructor(child: Child, count: number) {
this.child = child;
this.count = count;
}
} |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @ObjectLink parent: Parent;
// Value changes can be observed.
this.parent.child = new Child(5);
this.parent.count = 5;
// Child is not decorated by @Observed, therefore, its property changes cannot be observed.
this.parent.child.num = 5; |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class DateClass extends Date {
constructor(args: number | string) {
super(args);
}
}
@Observed
class NewDate {
public data: DateClass;
constructor(data: DateClass) {
this.data = data;
}
}
@Component
struct Child {
label: string = 'date';
@ObjectLink data: DateClass;
build() {
C... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class Info {
count: number;
constructor(count: number) {
this.count = count;
}
}
class Test {
msg: number;
constructor(msg: number) {
this.msg = msg;
}
}
// Incorrect format. The count type is not specified, leading to a compilation error.
@ObjectLink count;... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class Info {
count: number;
constructor(count: number) {
this.count = count;
}
}
// Incorrect format. An error is reported during compilation.
@ObjectLink count: Info = new Info(10);
// Correct format.
@ObjectLink count: Info; |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class Info {
count: number;
constructor(count: number) {
this.count = count;
}
}
@Component
struct Child {
@ObjectLink num: Info;
build() {
Column() {
Text(`Value of num: ${this.num.count}`)
.onClick(() => {
// Incorrect format. The vari... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class Info {
count: number;
constructor(count: number) {
this.count = count;
}
}
@Component
struct Child {
@ObjectLink num: Info;
build() {
Column() {
Text(`Value of num: ${this.num.count}`)
.onClick(() => {
// Correct format, which is u... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class Animal {
name: string;
age: number;
constructor(name: string, age: number) {
this.name = name;
this.age = age;
}
}
@Observed
class Dog extends Animal {
kinds: string;
constructor(name: string, age: number, kinds: string) {
super(name, age);
this.kinds = kinds;
}
}
@Entr... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class Book {
name: string;
constructor(name: string) {
this.name = name;
}
}
@Observed
class Bag {
book: Book;
constructor(book: Book) {
this.book = book;
}
}
@Component
struct BookCard {
@ObjectLink book: Book;
build() {
Column() {
Text(`BookCard: ${this.book.name}`) //... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | let NextID: number = 1;
@Observed
class Info {
public id: number;
public info: number;
constructor(info: number) {
this.id = NextID++;
this.info = info;
}
}
@Component
struct Child {
// The type of the Child's @ObjectLink is Info.
@ObjectLink info: Info;
label: string = 'ViewChild';
build() ... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class ObservedArray<T> extends Array<T> {
} |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | @Observed
class ObservedArray<T> extends Array<T> {
}
@Component
struct Item {
@ObjectLink itemArr: ObservedArray<string>;
build() {
Row() {
ForEach(this.itemArr, (item: string, index: number) => {
Text(`${index}: ${item}`)
.width(100)
.height(100)
}, (item: string) => ... |
application-dev\ui\state-management\arkts-observed-and-objectlink.md | import { UIUtils } from '@kit.ArkUI';
@Component
struct Item {
@ObjectLink itemArr: Array<string>;
build() {
Row() {
ForEach(this.itemArr, (item: string, index: number) => {
Text(`${index}: ${item}`)
.width(100)
.height(100)
}, (item: string) => item)
}
}
}
@Entr... |
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