harmony(鸿蒙)AccessibilityExtensionContext

  • 2022-10-28
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AccessibilityExtensionContext

The AccessibilityExtensionContext module, inherited from ExtensionContext, provides context for Accessibility Extension abilities.

You can use the APIs of this module to configure the concerned information, obtain root information, and inject gestures.

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 of this module can be used only in the stage model.

Usage

Before using the AccessibilityExtensionContext module, you must define a child class that inherits from AccessibilityExtensionAbility.

import AccessibilityExtensionAbility from '@ohos.application.AccessibilityExtensionAbility'
class MainAbility extends AccessibilityExtensionAbility {
    onConnect(): void {
        console.log("AxExtensionAbility onConnect");
        let axContext = this.context;
    }
}

FocusDirection

Enumerates the focus directions.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Name Description
up Search for the next focusable item above the current item in focus.
down Search for the next focusable item below the current item in focus.
left Search for the next focusable item on the left of the current item in focus.
right Search for the next focusable item on the right of the current item in focus.
forward Search for the next focusable item before the current item in focus.
backward Search for the next focusable item after the current item in focus.

FocusType

Enumerates the focus types.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Name Description
accessibility Accessibility focus.
normal Normal focus.

Rect

Defines a rectangle.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Name Type Readable Writable Description
left number Yes No Left boundary of the rectangle.
top number Yes No Top boundary of the rectangle.
width number Yes No Width of the rectangle.
height number Yes No Height of the rectangle.

WindowType

Enumerates the window types.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Name Description
application Application window.
system System window.

AccessibilityExtensionContext.setTargetBundleName

setTargetBundleName(targetNames: Array<string>): Promise<void>;

Sets the concerned target bundle.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
targetNames Array&lt;string&gt; Yes Name of the target bundle.

Return value

Type Description
Promise&lt;boolean&gt; Promise used to return the result.

Example

this.context.setTargetBundleName(['com.ohos.mms']);

AccessibilityExtensionContext.getFocusElement

getFocusElement(isAccessibilityFocus?: boolean): Promise<AccessibilityElement>;

Obtains the focus element.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
isAccessibilityFocus boolean No Whether the obtained focus element is an accessibility focus. The default value is false.

Return value

Type Description
Promise&lt;AccessibilityElement&gt; Promise used to return the current focus element.

Example

this.context.getFocusElement().then(focusElement => {
    console.log("AxExtensionAbility getFocusElement success");
})

AccessibilityExtensionContext.getWindowRootElement

getWindowRootElement(windowId?: number): Promise<AccessibilityElement>;

Obtains the root element of a window.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
windowId number No Window for which you want to obtain the root element. If this parameter is not specified, it indicates the current active window.

Return value

Type Description
Promise&lt;AccessibilityElement&gt; Promise used to return the root element.

Example

this.context.getWindowRootElement().then(rootElement => {
    console.log("AxExtensionAbility getWindowRootElement success");
})

AccessibilityExtensionContext.getWindows

getWindows(displayId?: number): Promise>;

Obtains the list of windows visible to users.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
displayId number No Screen from which the window information is obtained. If this parameter is not specified, it indicates the default home screen.

Return value

Type Description
Promise&lt;Array&lt;AccessibilityElement&gt;&gt; Promise used to return the window list.

Example

this.context.getWindows().then(windows => {
    console.log("AxExtensionAbility getWindows success");
})

AccessibilityExtensionContext.injectGesture

injectGesture(gesturePath: GesturePath, callback: AsyncCallback<void>): void

Injects a gesture.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
gesturePath GesturePath Yes Path of the gesture to inject.
callback AsyncCallback&lt;void&gt; Yes Callback used to return the result.

Example

let gesturePath = new GesturePath(100);
for (let i = 0; i < 10; i++) {
    let gesturePoint = new GesturePosition(100, i * 200);
    gesturePath.positions.push(gesturePoint);
}
this.context.gestureInject(gesturePath, (result) => {
    console.info('gestureInject result: ' + result);
})

AccessibilityElement.attributeNames

attributeNames<T extends keyof ElementAttributeValues>(): Promise<Array<T>>;

Obtains all attribute names of this element.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Return value

Type Description
Promise&lt;Array&lt;T&gt;&gt; Promise used to return all attribute names of the element.

Example

let accessibilityElement;
try {
    accessibilityElement.attributeNames().then((values) => {
        console.log("get attribute names success");
    }).catch((err) => {
        console.log("get attribute names err: "  + JSON.stringify(err));
    });
} catch (e) {
    console.log("An unexpected error occurred. Error:" + e);
}

AccessibilityElement.attributeValue

attributeValue<T extends keyof ElementAttributeValues>(attributeName: T): Promise<ElementAttributeValues[T]>;

Obtains the attribute value based on an attribute name.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
attributeName T Yes Attribute name.

Return value

Type Description
Promise&lt;Array&lt;ElementAttributeValues[T]&gt;&gt; Promise used to return the attribute value.

Example

let accessibilityElement;
try {
    let attributeName = 'name';
    accessibilityElement.attributeValue(attributeName).then((value) => {
        console.log("get attribute value by name success");
    }).catch((err) => {
        console.log("get attribute value by name err: "  + JSON.stringify(err));
    });
} catch (e) {
    console.log("An unexpected error occurred. Error:" + e);
}

AccessibilityElement.actionNames

actionNames(): Promise<Array<string>>;

Obtains the names of all actions supported by this element.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Return value

Type Description
Promise&lt;Array&lt;string&gt;&gt; Promise used to return the names of all actions supported by the element.

Example

let accessibilityElement;
try {
    accessibilityElement.actionNames().then((values) => {
        console.log("get action names success");
    }).catch((err) => {
        console.log("get action names err: "  + JSON.stringify(err));
    });
} catch (e) {
    console.log("An unexpected error occurred. Error:" + e);
}

AccessibilityElement.performAction

performAction(actionName: string, parameters?: object): Promise<boolean>;

Performs an action based on the specified action name.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
actionName string Yes Action name.
parameters object No Parameter required for performing the target action.

Return value

Type Description
Promise&lt;Array&lt;boolean&gt;&gt; Promise used to return the result.

Example

let accessibilityElement;
try {

    accessibilityElement.performAction('action').then((result) => {
        console.info('perform action result: ' + result);
    }).catch((err) => {
        console.log("perform action err: "  + JSON.stringify(err));
    });
} catch (e) {
    console.log("An unexpected error occurred. Error:" + e);
}

AccessibilityElement.findElement

findElement(type: ‘content’, condition: string): Promise<Array<AccessibilityElement>>;

Queries the information about this element based on the specified information type and condition.

System capability: SystemCapability.BarrierFree.Accessibility.Core

Parameters

Name Type Mandatory Description
type string Yes Information type. The value is fixed at ‘content’.
condition string Yes Search criteria.

Return value

Type Description
Promise&lt;Array&lt;T&gt;&gt; Promise used to return the result.

Example

let accessibilityElement;
try {
    let condition = 'keyword';
    accessibilityElement.findElement('content', condition).then((values) => {
        console.log("find element success");
    }).catch((err) => {
        console.log("find element err: "  + JSON.stringify(err));
    });
} catch (e) {
    console.log("An unexpected error occurred. Error:" + e);
}

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