未验证 提交 9a37d750 编写于 作者: O openharmony_ci 提交者: Gitee

!8639 翻译完成:7447+7519+7484 增加在ets页面中访问Context的指导说明

Merge pull request !8639 from wusongqing/TR7447
......@@ -6,13 +6,10 @@
The OpenHarmony application framework has two models: Feature Ability (FA) model and stage model. Correspondingly, there are two sets of context mechanisms. **application/BaseContext** is a common context base class. It uses the **stageMode** attribute to specify whether the context is used for the stage model.
- FA model
- FA model
Only the methods in **app/Context** can be used for the context in the FA model. Both the application-level context and ability-level context are instances of this type. If an ability-level method is invoked in the application-level context, an error occurs. Therefore, you must pay attention to the actual meaning of the **Context** instance.
Only the methods in **app/Context** can be used for the context in the FA model. Both the application-level context and ability-level context are instances of this type. If an ability-level method is invoked in the application-level context, an error occurs. Therefore, you must pay attention to the actual meaning of the **Context** instance.
- Stage model
The stage model has the following types of contexts: **application/Context**, **application/ApplicationContext**, **application/AbilityStageContext**, **application/ExtensionContext**, **application/AbilityContext**, and **application/FormExtensionContext**. For details about these contexts and how to use them, see [Context in the Stage Model](#context-in-the-stage-model).
![contextIntroduction](figures/contextIntroduction.png)
......@@ -108,11 +105,21 @@ export default class MyAbilityStage extends AbilityStage {
onAbilityCreate(ability){
console.log("AbilityLifecycleCallback onAbilityCreate ability:" + JSON.stringify(ability));
},
onAbilityWindowStageCreate(ability){
console.log("AbilityLifecycleCallback onAbilityWindowStageCreate ability:" + JSON.stringify(ability));
onWindowStageCreate(ability, windowStage){
console.log("AbilityLifecycleCallback onWindowStageCreate ability:" + JSON.stringify(ability));
console.log("AbilityLifecycleCallback onWindowStageCreate windowStage:" + JSON.stringify(windowStage));
},
onAbilityWindowStageDestroy(ability){
console.log("AbilityLifecycleCallback onAbilityWindowStageDestroy ability:" + JSON.stringify(ability));
onWindowStageActive(ability, windowStage){
console.log("AbilityLifecycleCallback onWindowStageActive ability:" + JSON.stringify(ability));
console.log("AbilityLifecycleCallback onWindowStageActive windowStage:" + JSON.stringify(windowStage));
},
onWindowStageInactive(ability, windowStage){
console.log("AbilityLifecycleCallback onWindowStageInactive ability:" + JSON.stringify(ability));
console.log("AbilityLifecycleCallback onWindowStageInactive windowStage:" + JSON.stringify(windowStage));
},
onWindowStageDestroy(ability, windowStage){
console.log("AbilityLifecycleCallback onWindowStageDestroy ability:" + JSON.stringify(ability));
console.log("AbilityLifecycleCallback onWindowStageDestroy windowStage:" + JSON.stringify(windowStage));
},
onAbilityDestroy(ability){
console.log("AbilityLifecycleCallback onAbilityDestroy ability:" + JSON.stringify(ability));
......@@ -226,6 +233,74 @@ export default class MainAbility extends Ability {
For details, see [FormExtensionContext](../reference/apis/js-apis-formextensioncontext.md).
### Obtaining the Context on an eTS Page
In the stage model, in the `onWindowStageCreate` lifecycle of an ability, you can call `SetUIContent` of `WindowStage` to load an eTS page. In some scenarios, you need to obtain the context on the page to call related APIs.
**How to Obtain**
Use the API described in the table below to obtain the context associated with an eTS page.
| API | Description |
| :------------------------------------ | :--------------------------- |
| getContext(component: Object): Object | Obtains the `Context` object associated with a component on the page.|
**Example**
```ts
// MainAbility.ts
import Ability from '@ohos.application.Ability'
export default class MainAbility extends Ability {
onCreate(want, launchParam) {
console.log("[Demo] MainAbility onCreate")
}
onDestroy() {
console.log("[Demo] MainAbility onDestroy")
}
onWindowStageCreate(windowStage) {
// Load the index page and pass the current Context object.
windowStage.setUIContent(this.context, "pages/index", null)
}
onWindowStageDestroy() {}
onForeground() {}
onBackground() {}
};
```
```ts
// pages/index.ets
import context from '@ohos.application.context'
type Context = context.Context
@Entry
@Component
struct Index {
build() {
Row() {
Column() {
Text('GetContext')
.fontSize(50)
.fontWeight(FontWeight.Bold)
.onClick(() => {
// Obtain the Context object associated with the current component.
var context : Context = getContext(this) as Context
console.info("CacheDir:" + context.cacheDir)
})
}
.width('100%')
}
.height('100%')
}
}
```
## Common Incorrect Usage
**Error 1: Use globalThis to obtain the context in the stage model.**
......
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