source stringlengths 14 113 | code stringlengths 10 21.3k |
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application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/pages/10-Builder.ets
import { AppStorageV2, PersistenceV2, Type } from '@kit.ArkUI';
import { common, Want } from '@kit.AbilityKit';
import { Setting } from './SettingPage';
import util from '@ohos.util';
@ObservedV2
class Task {
// The constructor is not implemented because @Type does not support c... |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/model/TaskModel.ets
export default class TaskModel {
taskName: string = 'Todo';
isFinish: boolean = false;
} |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/model/TaskListModel.ets
import { common } from '@kit.AbilityKit';
import util from '@ohos.util';
import TaskModel from'./TaskModel';
export default class TaskListModel {
tasks: TaskModel[] = [];
constructor(tasks: TaskModel[]) {
this.tasks = tasks;
}
async loadTasks(context: common.UIAbi... |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/viewmodel/TaskViewModel.ets
import TaskModel from '../model/TaskModel';
@ObservedV2
export default class TaskViewModel {
@Trace taskName: string = 'Todo';
@Trace isFinish: boolean = false;
updateTask(task: TaskModel) {
this.taskName = task.taskName;
this.isFinish = task.isFinish;
}
... |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/viewmodel/TaskListViewModel.ets
import { common } from '@kit.AbilityKit';
import { Type } from '@kit.ArkUI';
import TaskListModel from '../model/TaskListModel';
import TaskViewModel from'./TaskViewModel';
@ObservedV2
export default class TaskListViewModel {
@Type(TaskViewModel)
@Trace tasks: TaskV... |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/view/TitleView.ets
@ComponentV2
export default struct TitleView {
@Param tasksUnfinished: number = 0;
build() {
Column() {
Text('To-Dos')
.fontSize(40)
.margin(10)
Text(`Unfinished: ${this.tasksUnfinished}`)
.margin({ left: 10, bottom: 10 })
}
}
} |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/view/ListView.ets
import TaskViewModel from '../viewmodel/TaskViewModel';
import TaskListViewModel from '../viewmodel/TaskListViewModel';
import { Setting } from '../pages/SettingPage';
import { ActionButton } from './BottomView';
@ComponentV2
struct TaskItem {
@Param task: TaskViewModel = new TaskV... |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/view/BottomView.ets
import { common, Want } from '@kit.AbilityKit';
import TaskViewModel from '../viewmodel/TaskViewModel';
import TaskListViewModel from '../viewmodel/TaskListViewModel';
@Builder export function ActionButton(text: string, onClick:() => void) {
Button(text, { buttonStyle: ButtonStyl... |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/pages/TodoListPage.ets
import TaskListViewModel from '../viewmodel/TaskListViewModel';
import { common } from '@kit.AbilityKit';
import { AppStorageV2, PersistenceV2 } from '@kit.ArkUI';
import { Setting } from '../pages/SettingPage';
import TitleView from '../view/TitleView';
import ListView from '../... |
application-dev\ui\state-management\arkts-mvvm-V2.md | // src/main/ets/pages/SettingPage.ets
import { AppStorageV2 } from '@kit.ArkUI';
import { common } from '@kit.AbilityKit';
@ObservedV2
export class Setting {
@Trace showCompletedTask: boolean = true;
}
@Entry
@ComponentV2
struct SettingPage {
@Local setting: Setting = AppStorageV2.connect(Setting, 'Setting', () ... |
application-dev\ui\state-management\arkts-new-appstoragev2.md | // Data center
// Sample.ets
@ObservedV2
export class Sample {
@Trace p1: number = 0;
p2: number = 10;
} |
application-dev\ui\state-management\arkts-new-appstoragev2.md | // Page1.ets
import { AppStorageV2 } from '@kit.ArkUI';
import { Sample } from '../Sample';
@Entry
@ComponentV2
struct Page1 {
// Create a KV pair whose key is Sample in AppStorageV2 (if the key exists, the data in AppStorageV2 is returned) and associate it with prop.
@Local prop: Sample = AppStorageV2.connect(Sam... |
application-dev\ui\state-management\arkts-new-appstoragev2.md | // Page2.ets
import { AppStorageV2 } from '@kit.ArkUI';
import { Sample } from '../Sample';
@Builder
export function Page2Builder() {
Page2()
}
@ComponentV2
struct Page2 {
// Create a KV pair whose key is Sample in AppStorageV2 (if the key exists, the data in AppStorageV2 is returned) and associate it with prop.
... |
application-dev\ui\state-management\arkts-new-binding.md | @Entry
@ComponentV2
struct Index {
@Local value: number = 0;
build() {
Column() {
Text(`${this.value}`)
Button(`change value`).onClick(() => {
this.value++;
})
Star({ value: this.value!! })
}
}
}
@ComponentV2
struct Star {
@Param value: number = 0;
@Event $value: (va... |
application-dev\ui\state-management\arkts-new-binding.md | @Entry
@ComponentV2
struct BindMenuInterface {
@Local isShow: boolean = false;
build() {
Column() {
Row() {
Text('click show Menu')
.bindMenu(this.isShow!!, // Two-way binding.
[
{
value: 'Menu1',
action: () => {
... |
application-dev\ui\state-management\arkts-new-componentV2.md | @ComponentV2 // Decorator
struct Index { // Data declared by the struct
build() { // UI defined by build
}
} |
application-dev\ui\state-management\arkts-new-Computed.md | @Computed
get varName(): T {
return value;
} |
application-dev\ui\state-management\arkts-new-Computed.md | @Computed
get fullName() { // Correct format.
return this.firstName + ' ' + this.lastName;
}
@Computed val: number = 0; // Incorrect format. An error is reported during compilation.
@Computed
func() { // Incorrect usage. An error is reported during compilation.
} |
application-dev\ui\state-management\arkts-new-Computed.md | @Computed
get fullName() {
this.lastName += 'a'; // Error. The properties involved in computation cannot be changed.
return this.firstName + ' ' + this.lastName;
} |
application-dev\ui\state-management\arkts-new-Computed.md | @ComponentV2
struct Child {
@Param double: number = 100;
@Event $double: (val: number) => void;
build() {
Button('ChildChange')
.onClick(() => {
this.$double(200);
})
}
}
@Entry
@ComponentV2
struct Index {
@Local count: number = 100;
@Computed
... |
application-dev\ui\state-management\arkts-new-Computed.md | @Local a : number = 1;
@Computed
get b() {
return this.a + ' ' + this.c; // Incorrect format. A loop b -> c -> b exists.
}
@Computed
get c() {
return this.a + ' ' + this.b; // Incorrect format. A loop c -> b -> c exists.
} |
application-dev\ui\state-management\arkts-new-Computed.md | @Entry
@ComponentV2
struct Index {
@Local firstName: string = 'Li';
@Local lastName: string = 'Hua';
age: number = 20; // Computed cannot be triggered.
@Computed
get fullName() {
console.info("---------Computed----------");
return this.firstName + ' ' + this.lastName + this.age;
}
build() {
... |
application-dev\ui\state-management\arkts-new-Computed.md | @ObservedV2
class Name {
@Trace firstName: string = 'Li';
@Trace lastName: string = 'Hua';
@Computed
get fullName() {
console.info('---------Computed----------');
return this.firstName + ' ' + this.lastName;
}
}
const name: Name = new Name();
@Entry
@ComponentV2
struct Index {
name1: Name = name;... |
application-dev\ui\state-management\arkts-new-Computed.md | @Entry
@ComponentV2
struct MyView {
@Local celsius: number = 20;
@Computed
get fahrenheit(): number {
return this.celsius * 9 / 5 + 32; // C -> F
}
@Computed
get kelvin(): number {
return (this.fahrenheit - 32) * 5 / 9 + 273.15; // F -> K
}
@Monitor("kelvin")
onKelvinMonitor(mon: IMonitor) ... |
application-dev\ui\state-management\arkts-new-Computed.md | @ObservedV2
class Article {
@Trace quantity: number = 0;
unitPrice: number = 0;
constructor(quantity: number, unitPrice: number) {
this.quantity = quantity;
this.unitPrice = unitPrice;
}
}
@Entry
@ComponentV2
struct Index {
@Local shoppingBasket: Article[] = [new Article(1, 20), new Article(5, 2)];
... |
application-dev\ui\state-management\arkts-new-event.md | @ComponentV2
struct Index {
@Event changeFactory: ()=>void = ()=>{}; // Correct usage.
@Event message: string = "abcd"; // Incorrect usage. Variable of the non-function type is decorated.
}
@Component
struct Index {
@Event changeFactory: ()=>void = ()=>{}; // Incorrect usage. An error is reported du... |
application-dev\ui\state-management\arkts-new-event.md | @Entry
@ComponentV2
struct Index {
@Local title: string = "Title One";
@Local fontColor: Color = Color.Red;
build() {
Column() {
Child({
title: this.title,
fontColor: this.fontColor,
changeFactory: (type: number) => {
if (type == 1) {
this.title = "Title On... |
application-dev\ui\state-management\arkts-new-event.md | @ComponentV2
struct Child {
@Param index: number = 0;
@Event changeIndex: (val: number) => void;
build() {
Column() {
Text(`Child index: ${this.index}`)
.onClick(() => {
this.changeIndex(20);
console.log(`after changeIndex ${this.index}`);
})
}
}
}
@Entry
@Comp... |
application-dev\ui\state-management\arkts-new-getTarget.md | import { UIUtils } from '@kit.ArkUI'; |
application-dev\ui\state-management\arkts-new-getTarget.md | import { UIUtils } from '@kit.ArkUI';
let res = UIUtils.getTarget(2); // Incorrect usage. The input parameter is of the non-object type.
@Observed
class Info {
name: string = "Tom";
}
let info: Info = new Info();
let rawInfo: Info = UIUtils.getTarget (info); // Correct usage. |
application-dev\ui\state-management\arkts-new-getTarget.md | import { UIUtils } from '@kit.ArkUI';
@Observed
class Info {
name: string = "Tom";
}
@Entry
@Component
struct Index {
@State info: Info = new Info();
build() {
Column() {
Text(`info.name: ${this.info.name}`)
Button(`Change the attributes of the proxy object`)
... |
application-dev\ui\state-management\arkts-new-getTarget.md | @Observed
class ObservedClass {
name: string = "Tom";
}
class NonObservedClass {
name: string = "Tom";
}
let observedClass: ObservedClass = new ObservedClass(); // Proxied.
let nonObservedClass: NonObservedClass = new NonObservedClass(); // Not proxied. |
application-dev\ui\state-management\arkts-new-getTarget.md | @Observed
class ObservedClass {
name: string = "Tom";
}
class NonObservedClass {
name: string = "Tom";
}
let observedClass: ObservedClass = new ObservedClass(); // Proxied.
let nonObservedClass: NonObservedClass = new NonObservedClass(); // Not proxied.
@Entry
@Component
struct Index {
@State observedObject: Obse... |
application-dev\ui\state-management\arkts-new-getTarget.md | import { UIUtils } from '@kit.ArkUI';
@Observed
class ObservedClass {
name: string = "Tom";
}
class NonObservedClass {
name: string = "Tom";
}
let observedClass: ObservedClass = new ObservedClass(); // Proxied.
let nonObservedClass: NonObservedClass = new NonObservedClass(); // Not proxied.
let globalNumberList: nu... |
application-dev\ui\state-management\arkts-new-getTarget.md | @ObservedV2
class ObservedClass {
@Trace name: string = "Tom";
}
let globalObservedObject: ObservedClass = new ObservedClass(); // Not proxied.
let globalNumberList: number[] = [1, 2, 3]; // Not proxied.
let globalSampleMap: Map<number, string> = new Map([[0, "a"], [1, "b"], [3, "c"]]); // Not proxied.
let globalSamp... |
application-dev\ui\state-management\arkts-new-getTarget.md | import { UIUtils } from '@kit.ArkUI';
@ObservedV2
class ObservedClass {
@Trace name: string = "Tom";
}
let globalObservedObject: ObservedClass = new ObservedClass(); // Not proxied.
let globalNumberList: number[] = [1, 2, 3]; // Not proxied.
let globalSampleMap: Map<number, string> = new Map([[0, "a"], [1, "b"], [3, ... |
application-dev\ui\state-management\arkts-new-getTarget.md | // Class decorated by @ObservedV2.
@ObservedV2
class Info {
@Trace name: string = "Tom";
@Trace age: number = 24;
}
let info: Info = new Info(); // info instance passed in through Node-APIs. |
application-dev\ui\state-management\arkts-new-local.md | class ComponentInfo {
name: string;
count: number;
message: string;
constructor(name: string, count: number, message: string) {
this.name = name;
this.count = count;
this.message = message;
}
}
@Component
struct Child {
@State componentInfo: ComponentInfo = new ComponentInfo("Child", 1, "Hello W... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct Index {
@Local count: number = 0;
@Local message: string = "Hello";
@Local flag: boolean = false;
build() {
Column() {
Text(`${this.count}`)
Text(`${this.message}`)
Text(`${this.flag}`)
Button("change Local")
.onClick(()=>{
... |
application-dev\ui\state-management\arkts-new-local.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 rawO... |
application-dev\ui\state-management\arkts-new-local.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.di... |
application-dev\ui\state-management\arkts-new-local.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-local.md | @ComponentV2
struct MyComponent {
@Local message: string = "Hello World"; // Correct usage.
build() {
}
}
@Component
struct TestComponent {
@Local message: string = "Hello World"; // Incorrect usage. An error is reported during compilation.
build() {
}
} |
application-dev\ui\state-management\arkts-new-local.md | @ComponentV2
struct ChildComponent {
@Local message: string = "Hello World";
build() {
}
}
@ComponentV2
struct MyComponent {
build() {
ChildComponent({ message: "Hello" }) // Incorrect usage. An error is reported during compilation.
}
} |
application-dev\ui\state-management\arkts-new-local.md | @ObservedV2
class Info {
@Trace name: string;
@Trace age: number;
constructor(name: string, age: number) {
this.name = name;
this.age = age;
}
}
@Entry
@ComponentV2
struct Index {
info: Info = new Info("Tom", 25);
@Local localInfo: Info = new Info("Tom", 25);
build() {
Column() {
Text(`i... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct DatePickerExample {
@Local selectedDate: Date = new Date('2021-08-08');
build() {
Column() {
Button('set selectedDate to 2023-07-08')
.margin(10)
.onClick(() => {
this.selectedDate = new Date('2023-07-08');
})
Button('increase the year by... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct MapSample {
@Local message: Map<number, string> = new Map([[0, "a"], [1, "b"], [3, "c"]]);
build() {
Row() {
Column() {
ForEach(Array.from(this.message.entries()), (item: [number, string]) => {
Text(`${item[0]}`).fontSize(30)
Text(`${item[1]}`).fontS... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct SetSample {
@Local message: Set<number> = new Set([0, 1, 2, 3, 4]);
build() {
Row() {
Column() {
ForEach(Array.from(this.message.entries()), (item: [number, string]) => {
Text(`${item[0]}`).fontSize(30)
Divider()
})
Button('init set')... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct Index {
@Local count: number | undefined = 10;
build() {
Column() {
Text(`count(${this.count})`)
Button("change to undefined")
.onClick(() => {
this.count = undefined;
})
Button("change to number")
.onClick(() => {
this.co... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct Index {
list: string[][] = [['a'], ['b'], ['c']];
@Local dataObjFromList: string[] = this.list[0];
@Monitor("dataObjFromList")
onStrChange(monitor: IMonitor) {
console.log("dataObjFromList has changed");
}
build() {
Column() {
Button('change to self').onClick(() =>... |
application-dev\ui\state-management\arkts-new-local.md | import { UIUtils } from '@ohos.arkui.StateManagement';
@Entry
@ComponentV2
struct Index {
list: string[][] = [['a'], ['b'], ['c']];
@Local dataObjFromList: string[] = this.list[0];
@Monitor("dataObjFromList")
onStrChange(monitor: IMonitor) {
console.log("dataObjFromList has changed");
}
build() {
... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct Index {
@Local w: number = 50; // Width.
@Local h: number = 50; // Height.
@Local message: string = 'Hello';
build() {
Column() {
Button('change size')
.margin(20)
.onClick(() => {
// Values are changed additionally before the animation is executed... |
application-dev\ui\state-management\arkts-new-local.md | @Entry
@ComponentV2
struct Index {
@Local w: number = 50; // Width.
@Local h: number = 50; // Height.
@Local message: string = 'Hello';
build() {
Column() {
Button('change size')
.margin(20)
.onClick(() => {
// Values are changed additionally before the animation is executed... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI'; |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI';
let res1 = UIUtils.makeObserved(2); // Invalid input parameter. An error is reported during compilation.
let res2 = UIUtils.makeObserved(undefined); // Invalid input parameter. The parameter itself is returned, that is, res2 = = = undefined.
let res3 = UIUtils.makeObserved(nu... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI';
@ObservedV2
class Info {
@Trace id: number = 0;
}
// Incorrect usage: If makeObserved finds that the input instance is an instance of a class decorated by @ObservedV2, makeObserved returns the input object itself.
let observedInfo: Info = UIUtils.makeObserved(new Info... |
application-dev\ui\state-management\arkts-new-makeObserved.md | // Incorrect usage. An exception occurs during running.
@State message: Info = UIUtils.makeObserved(new Info(20)); |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI';
class Person {
age: number = 10;
}
class Info {
id: number = 0;
person: Person = new Person();
}
@Entry
@Component
struct Index {
@State message: Info = new Info();
@State message2: Info = UIUtils.makeObserved(this.message); // An exception does no... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI';
class Info {
id: number = 0;
constructor(id: number) {
this.id = id;
}
}
@Entry
@ComponentV2
struct Index {
@Local message: Info = UIUtils.makeObserved(new Info(20));
build() {
Column() {
Button(`change id`).onClick(() => {
... |
application-dev\ui\state-management\arkts-new-makeObserved.md | // SendableData.ets
@Sendable
export class SendableData {
name: string = 'Tom';
age: number = 20;
gender: number = 1;
// Other attributes are omitted here.
likes: number = 1;
follow: boolean = false;
} |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { taskpool } from '@kit.ArkTS';
import { SendableData } from './SendableData';
import { UIUtils } from '@kit.ArkUI';
@Concurrent
function threadGetData(param: string): SendableData {
// Process data in the subthread.
let ret = new SendableData();
console.info(`Concurrent threadGetData, param ${param}`);
... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { collections } from '@kit.ArkTS';
import { UIUtils } from '@kit.ArkUI';
@Sendable
class Info {
id: number = 0;
name: string = 'cc';
constructor(id: number) {
this.id = id;
}
}
@Entry
@ComponentV2
struct Index {
scroller: Scroller = new Scroller();
@Local arrCollect: collections.Array<Info> =... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { collections } from '@kit.ArkTS';
import { UIUtils } from '@kit.ArkUI';
@Sendable
class Info {
id: number = 0;
constructor(id: number) {
this.id = id;
}
}
@Entry
@ComponentV2
struct CollectionMap {
mapCollect: collections.Map<string, Info> = UIUtils.makeObserved(new collections.Map<string, Info>... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { collections } from '@kit.ArkTS';
import { UIUtils } from '@kit.ArkUI';
@Sendable
class Info {
id: number = 0;
constructor(id: number) {
this.id = id;
}
}
@Entry
@ComponentV2
struct Index {
set: collections.Set<Info> = UIUtils.makeObserved(new collections.Set<Info>([new Info(10), new Info(20)]));... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { JSON } from '@kit.ArkTS';
import { UIUtils } from '@kit.ArkUI';
class Info {
id: number = 0;
constructor(id: number) {
this.id = id;
}
}
let test: Record<string, number> = { "a": 123 };
let testJsonStr: string = JSON.stringify(test);
let test2: Record<string, Info> = { "a": new Info(20) };
let tes... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI';
class Info {
id: number = 0;
age: number = 20;
constructor(id: number) {
this.id = id;
}
}
@Entry
@ComponentV2
struct Index {
@Local message: Info = UIUtils.makeObserved(new Info(20));
@Monitor('message.id')
onStrChange(monitor: IMonitor) {
console.log(`na... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI';
class Info {
id: number = 0;
constructor(id: number) {
this.id = id;
}
}
@Entry
@Component
struct Index {
// Using makeObserved together with @State, a runtime exception is thrown.
message: Info = UIUtils.makeObserved(new Info(20));
build() {
RelativeContain... |
application-dev\ui\state-management\arkts-new-makeObserved.md | import { UIUtils } from '@kit.ArkUI';
class Info {
id: number = 0;
}
@Entry
@Component
struct Index {
observedObj: Info = UIUtils.makeObserved(new Info());
build() {
Column() {
Text(`${this.observedObj.id}`)
.fontSize(50)
.onClick(() => {
// Use getTarget to obtain the origina... |
application-dev\ui\state-management\arkts-new-monitor.md | @Observed
class Info {
name: string = "Tom";
age: number = 25;
}
@Entry
@Component
struct Index {
@State @Watch('onInfoChange') info: Info = new Info();
@State @Watch('onNumArrChange') numArr: number[] = [1,2,3,4,5];
onInfoChange() {
console.log(`info after change name: ${this.info.name}, age: ${this.inf... |
application-dev\ui\state-management\arkts-new-monitor.md | @Entry
@ComponentV2
struct Index {
@Local message: string = "Hello World";
@Local name: string = "Tom";
@Local age: number = 24;
@Monitor("message", "name")
onStrChange(monitor: IMonitor) {
monitor.dirty.forEach((path: string) => {
console.log(`${path} changed from ${monitor.value(... |
application-dev\ui\state-management\arkts-new-monitor.md | class Info {
name: string;
age: number;
constructor(name: string, age: number) {
this.name = name;
this.age = age;
}
}
@Entry
@ComponentV2
struct Index {
@Local info: Info = new Info("Tom", 25);
@Monitor("info")
infoChange(monitor: IMonitor) {
console.log(`info chan... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace name: string = "Tom";
@Trace region: string = "North";
@Trace job: string = "Teacher";
age: number = 25;
// name is decorated by @Trace. Can listen for the change.
@Monitor("name")
onNameChange(monitor: IMonitor) {
console.log(`name change from ${monitor.value()?.before... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Inner {
@Trace num: number = 0;
}
@ObservedV2
class Outer {
inner: Inner = new Inner();
@Monitor("inner.num")
onChange(monitor: IMonitor) {
console.log(`inner.num change from ${monitor.value()?.before} to ${monitor.value()?.now}`);
}
}
@Entry
@ComponentV2
struct Index {
outer: Outer = ... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Base {
@Trace name: string;
// Listen for the name property of the base class.
@Monitor("name")
onBaseNameChange(monitor: IMonitor) {
console.log(`Base Class name change`);
}
constructor(name: string) {
this.name = name;
}
}
@ObservedV2
class Derived extends Base {
// Listen fo... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace name: string;
@Trace age: number;
constructor(name: string, age: number) {
this.name = name;
this.age = age;
}
}
@ObservedV2
class ArrMonitor {
@Trace dimensionTwo: number[][] = [[1,1,1],[2,2,2],[3,3,3]];
@Trace dimensionThree: number[][][] = [[[1],[2],[3]],[[4],[5... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace person: Person;
@Monitor("person.name")
onNameChange(monitor: IMonitor) {
console.log(`name change from ${monitor.value()?.before} to ${monitor.value()?.now}`);
}
@Monitor("person.age")
onAgeChange(monitor: IMonitor) {
console.log(`age change from ${monitor.value()?.b... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Frequence {
@Trace count: number = 0;
@Monitor("count")
onCountChange(monitor: IMonitor) {
console.log(`count change from ${monitor.value()?.before} to ${monitor.value()?.now}`);
}
}
@Entry
@ComponentV2
struct Index {
frequence: Frequence = new Frequence();
build() {
Column() {
... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace name: string = "Tom";
@Monitor("name")
onNameChange(monitor: IMonitor) {
console.log(`onNameChange`);
}
@Monitor("name")
onNameChangeDuplicate(monitor: IMonitor) {
console.log(`onNameChangeDuplicate`);
}
}
@Entry
@ComponentV2
struct Index {
info: Info = new Info()... |
application-dev\ui\state-management\arkts-new-monitor.md | const t2: string = "t2"; // Constant
enum ENUM {
T3 = "t3" // Enum
};
let t4: string = "t4"; // Variable
@ObservedV2
class Info {
@Trace t1: number = 0;
@Trace t2: number = 0;
@Trace t3: number = 0;
@Trace t4: number = 0;
@Trace t5: number = 0;
@Monitor("t1") // String literal
onT1Change(monitor: IMonit... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace count: number = 0;
@Monitor("count")
onCountChange(monitor: IMonitor) {
this.count++; // Avoid using this method because it may cause infinite loops.
}
} |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace value: number = 50;
}
@ObservedV2
class UIStyle {
info: Info = new Info();
@Trace color: Color = Color.Black;
@Trace fontSize: number = 45;
@Monitor("info.value")
onValueChange(monitor: IMonitor) {
let lastValue: number = monitor.value()?.before as number;
let curValu... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace message: string = "not initialized";
constructor() {
console.log("in constructor message change to initialized");
this.message = "initialized";
}
}
@ComponentV2
struct Child {
@Param info: Info = new Info();
@Monitor("info.message")
onMessageChange(monitor: IMonitor)... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
@Trace message: string = "not initialized";
constructor() {
this.message = "initialized";
}
@Monitor("message")
onMessageChange(monitor: IMonitor) {
console.log(`message change from ${monitor.value()?.before} to ${monitor.value()?.now}`);
}
}
@Entry
@ComponentV2
struct Ind... |
application-dev\ui\state-management\arkts-new-monitor.md | message change from initialized to Index aboutToAppear
message change from Index aboutToAppear to Index click to change message |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class InfoWrapper {
info?: Info;
constructor(info: Info) {
this.info = info;
}
@Monitor("info.age")
onInfoAgeChange(monitor: IMonitor) {
console.log(`age change from ${monitor.value()?.before} to ${monitor.value()?.now}`)
}
}
@ObservedV2
class Info {
@Trace age: number;
constructor(a... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class InfoWrapper {
info?: Info;
constructor(info: Info) {
this.info = info;
}
}
@ObservedV2
class Info {
@Trace age: number;
constructor(age: number) {
this.age = age;
}
}
@ComponentV2
struct Child {
@Param @Require infoWrapper: InfoWrapper;
@Monitor("infoWrapper.info.age")
onInfo... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class InfoWrapper {
info?: Info;
constructor(info: Info) {
this.info = info;
}
@Monitor("info.age")
onInfoAgeChange(monitor: IMonitor) {
console.log(`age change from ${monitor.value()?.before} to ${monitor.value()?.now}`)
}
}
@ObservedV2
class Info {
@Trace age: number;
constructor(a... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
name: string = "John";
@Trace age: number = 24;
@Monitor("age", "name") // Listen for the state variable "age" and non-state variable "name" at the same time.
onPropertyChange(monitor: IMonitor) {
monitor.dirty.forEach((path: string) => {
console.log(`property path:${path} cha... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
name: string = "John";
@Trace age: number = 24;
@Monitor("age") // Only listen for the state variable "age".
onPropertyChange(monitor: IMonitor) {
monitor.dirty.forEach((path: string) => {
console.log(`property path:${path} change from ${monitor.value(path)?.before} to ${monit... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
name: string = "John";
@Trace age: number = 24;
get myAge() {
return this.age; // age is a state variable.
}
@Monitor("myAge") // Listen for non-@Computed decorated getter accessor.
onPropertyChange() {
console.log("age changed");
}
}
@Entry
@ComponentV2
struct Index {
i... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
name: string = "John";
@Trace age: number = 24;
@Computed // Add @Computed to myAge as a state variable.
get myAge() {
return this.age;
}
@Monitor("myAge") // Listen for @Computed decorated getter accessor.
onPropertyChange() {
console.log("age changed");
}
}
@Entry
@Com... |
application-dev\ui\state-management\arkts-new-monitor.md | @ObservedV2
class Info {
name: string = "John";
@Trace age: number = 24;
@Monitor("age") // Only listen for the state variable "age".
onPropertyChange() {
console.log("age changed");
}
}
@Entry
@ComponentV2
struct Index {
info: Info = new Info();
build() {
Column() {
Button("change age")
... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @Observed
class Father {
son: Son;
constructor(name: string, age: number) {
this.son = new Son(name, age);
}
}
@Observed
class Son {
name: string;
age: number;
constructor(name: string, age: number) {
this.name = name;
this.age = age;
}
}
@Entry
@Component
struct Index {
@State father: Fat... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @Observed
class Father {
son: Son;
constructor(name: string, age: number) {
this.son = new Son(name, age);
}
}
@Observed
class Son {
name: string;
age: number;
constructor(name: string, age: number) {
this.name = name;
this.age = age;
}
}
@Component
struct Child {
@ObjectLink son: Son;
... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Son {
@Trace age: number = 100;
}
class Father {
son: Son = new Son();
}
@Entry
@ComponentV2
struct Index {
father: Father = new Father();
build() {
Column() {
// If age is changed, the Text component is re-rendered.
Text(`${this.father.son.age}`)
.onClick(() => {
... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Father {
@Trace name: string = "Tom";
}
class Son extends Father {
}
@Entry
@ComponentV2
struct Index {
son: Son = new Son();
build() {
Column() {
// If name is changed, the Text component is re-rendered.
Text(`${this.son.name}`)
.onClick(() => {
this.son.name ... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Manager {
@Trace static count: number = 1;
}
@Entry
@ComponentV2
struct Index {
build() {
Column() {
// If count is changed, the Text component is re-rendered.
Text(`${Manager.count}`)
.onClick(() => {
Manager.count++;
})
}
}
} |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2
class Person {
id: number = 0;
@Trace age: number = 8;
}
@Entry
@ComponentV2
struct Index {
person: Person = new Person();
build() {
Column() {
// age is decorated by @Trace and can trigger re-renders when used in the UI.
Text(`${this.person.age}`)
.onClick(() => {
... |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | @ObservedV2 // Incorrect usage. An error is reported during compilation.
struct Index {
build() {
}
} |
application-dev\ui\state-management\arkts-new-observedV2-and-trace.md | class User {
id: number = 0;
@Trace name: string = "Tom"; // Incorrect usage. An error is reported at compile time.
} |
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