Applicable to: OpenHarmony SDK 3.2.5.3, stage model of API version 9
Applicable to: OpenHarmony SDK 3.2.5.3, stage model of API version 9
The **\<List>** component is a scrollable container. By default, it taks up the entire screen height. When any component with a fixed height takes up part of the screen height, you need to explicitly specify **layoutWeight(1)** for the parent container of the **\<List>** component to take up the remaining height instead of the entire screen height.
The **\<List>** component is a scrollable container. By default, it takes up the entire screen height. When any component with a fixed height takes up part of the screen height, you need to explicitly specify **layoutWeight(1)** for the parent container of the **\<List>** component to take up the remaining height instead of the entire screen height.
## How do I center child components in a grid container?
## How do I center child components in a grid container?
The **config** module allows you to configure system accessibility features, including accessibility extension, high-contrast text, mouse buttons, and captions.
> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
>
> The APIs provided by this module are system APIs.
| invertColor | [Config](#config)\<boolean>| Yes| Yes| Whether to enable color inversion.|
| daltonizationColorFilter | [Config](#config)<[DaltonizationColorFilter](#daltonizationcolorfilter)>| Yes| Yes| Configuration of the daltonization filter.|
| contentTimeout | [Config](#config)\<number>| Yes| Yes| Recommended duration for content display. The value ranges from 0 to 5000, in milliseconds.|
| animationOff | [Config](#config)\<boolean>| Yes| Yes| Whether to enable animation.|
| brightnessDiscount | [Config](#config)\<number>| Yes| Yes| Brightness discount. The value ranges from 0 to 1.0.|
| mouseKey | [Config](#config)\<boolean>| Yes| Yes| Whether to enable the mouse button feature.|
| mouseAutoClick | [Config](#config)\<number>| Yes| Yes| Interval for the automatic mouse clicks. The value ranges from 0 to 5000, in milliseconds.|
| shortkey | [Config](#config)\<boolean>| Yes| Yes| Whether to enable the accessibility extension shortcut key.|
| shortkeyTarget | [Config](#config)\<string>| Yes| Yes| Target application for the accessibility extension shortcut key. The value format is bundleName/abilityName.|
| captions | [Config](#config)\<boolean>| Yes| Yes| Whether to enable captions.|
| type | string | Yes| Listening type. The value is fixed at **'enableAbilityListsStateChanged'**, indicating that the changes in the list of enabled accessibility extension abilities.|
| callback | Callback<void> | Yes| Callback invoked when the list of enabled accessibility extension abilities changes.|
**Example**
```typescript
config.on('enableAbilityListsStateChanged',()=>{
console.info('ax extension ability enable list changed');
| type | string | No| Listening type. The value is fixed at **'enableAbilityListsStateChanged'**, indicating that the changes in the list of enabled accessibility extension abilities.|
| callback | Callback<void> | No| Callback invoked when the list of enabled accessibility extension abilities changes.|
**Example**
```typescript
config.off('enableAbilityListsStateChanged');
```
## Config
Implements configuration, acquisition, and listening for attributes.
### set
set(value: T): Promise<void>;
Sets this attribute. This API uses a promise to return the result.
| enable | boolean | Yes | Whether to return a list of activated input methods. The value **true** means to return a list of activated input methods, and **false** means to return a list of deactivated input methods. |
| enable | boolean | Yes | Whether to return a list of activated input methods. The value **true** means to return a list of activated input methods, and **false** means to return a list of deactivated input methods. |
| callback | Array<[InputMethodProperty](#inputmethodproperty8)> | Yes | Callback used to return a list of activated or deactivated input methods.|
| callback | Array<[InputMethodProperty](#inputmethodproperty8)> | Yes | Callback used to return a list of activated or deactivated input methods.|
Displays a dialog box for selecting an input method. This API uses a promise to return the result. If any parameter is passed in, an exception is thrown.
Displays a dialog box for selecting an input method. This API uses a promise to return the result. If any parameter is passed in, an exception is thrown.
**System API**: This is a system API and cannot be called by third-party applications.
| Name| Description|
| -------- | -------- |
**Parameters**
| eventType | System event type.|
| params | System event parameters.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type.<br>- **"beginSleep"**: The screen enters sleep mode.<br>- **"endSleep"**: The screen exits sleep mode.<br>- **"changeUser"**: The user is switched.|
| callback | Callback\<number\> | Yes| Callback used to return the result. |
| parameter | number | Yes| Screen unlock status.<br>- **0**: The unlock is successful.<br>- **1**: The unlock failed.<br>- **2**: The unlock was canceled.|
| parameter | number | Yes| Screen unlock status.<br>- **0**: The unlock is successful.<br>- **1**: The unlock fails.<br>- **2**: The unlock is canceled.|
