harmony 鸿蒙xcomponent

2022-08-09
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xcomponent

NOTE

This component is supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.

The <xcomponent> displays the components to which the EGL/OpenGLES or media data is written.

Required Permissions

None

Child Components

Not supported

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Mandatory	Description
id	string	Yes	Unique ID of the component. The value can contain a maximum of 128 characters.
type	string	Yes	Type of the component. The options are as follows: - surface: The content of this type of component is displayed individually, without being combined with that of other components. - component: The content of this type of component is displayed after having been combined with that of other components.
libraryname	string	No	Name of the dynamic library generated after compilation at the application native layer.

Styles

The universal styles are supported.

Events

In addition to the universal events, the following events are supported.

Name	Description
onLoad(context?: object) => void	Triggered when the plug-in is loaded. context: context of an <XComponent> object. The APIs contained in the context are defined by developers.
onDestroy() => void	Triggered when the plug-in is destroyed.

Methods

In addition to the universal methods, the following methods are supported.

Name	Parameter	Return Value Type	Description
getXComponentSurfaceId	-	string	Obtains the ID of the surface held by the <XComponent>. The ID can be used for @ohos interfaces, such as camera-related interfaces.
setXComponentSurfaceSize	{ surfaceWidth: number, surfaceHeight: number }	-	Sets the width and height of the surface held by the <XComponent>.
getXComponentContext	-	object	Obtains the instance object of the xcomponent method extended by the developer.

Example

Provide a surface-type <XComponent> to support camera preview and other capabilities.

<!-- xxx.hml -->
<div style="height: 500px; width: 500px; flex-direction: column; justify-content: center; align-items: center;">
	<text id = 'camera' class = 'title'>camera_display</text>
	<xcomponent id = 'xcomponent' type = 'surface' onload = 'onload' ondestroy = 'ondestroy'></xcomponent>
</div>

// xxx.js
import camera from '@ohos.multimedia.camera';
export default {
    onload() {
        var surfaceId = this.$element('xcomponent').getXComponentSurfaceId();
        camera.createPreviewOutput(surfaceId).then((previewOutput) => {
            console.log('Promise returned with the PreviewOutput instance');
        })
    }
}