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<string>	Yes	Name of the target bundle.

Return value

Type	Description
Promise<boolean>	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<AccessibilityElement>	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<AccessibilityElement>	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<Array<AccessibilityElement>>	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<void>	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<Array<T>>	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<Array<ElementAttributeValues[T]>>	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<Array<string>>	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<Array<boolean>>	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<Array<T>>	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);
}