harmony 鸿蒙@ohos.arkui.componentUtils (componentUtils)

2023-10-30
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@ohos.arkui.componentUtils (componentUtils)

The componentUtils module provides API for obtaining the coordinates and size of the drawing area of a component.

NOTE

The APIs of this module are supported since API version 10. Updates will be marked with a superscript to indicate their earliest API version.

The functionality of this module depends on UI context. This means that the APIs of this module cannot be used where the UI context is unclear. For details, see UIContext.

Since API version 10, you can use the getComponentUtils API in UIContext to obtain the ComponentUtils object associated with the current UI context. For this API to work correctly, call it after the notification indicating completion of component layout is received through @ohos.arkui.inspector (layout callback).

Modules to Import

import componentUtils from '@ohos.arkui.componentUtils'

componentUtils.getRectangleById

getRectangleById(id: string): ComponentInfo

Obtains a ComponentInfo object based on the component ID.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Component ID.

Return value

Type	Description
ComponentInfo	ComponentInfo object, which provides the size, position, translation, scaling, rotation, and affine matrix information of the component.

Example

import componentUtils from '@ohos.arkui.componentUtils';
let modePosition:componentUtils.ComponentInfo = componentUtils.getRectangleById("onClick");

ComponentInfo

System capability: SystemCapability.ArkUI.ArkUI.Full

Name	Type	Mandatory	Description
size	Size	Yes	Component size.
localOffset	Offset	Yes	Offset of the component relative to the parent component.
windowOffset	Offset	Yes	Offset of the component relative to the window.
screenOffset	Offset	Yes	Offset of the component relative to the screen.
translate	TranslateResult	Yes	Translation of the component.
scale	ScaleResult	Yes	Scaling of the component.
rotate	RotateResult	Yes	Rotation of the component.
transform	Matrix4Result	Yes	Affine matrix of the component, which is a 4x4 matrix object created based on the input parameter.

Size

System capability: SystemCapability.ArkUI.ArkUI.Full

Name	Type	Mandatory	Description
width	number	Yes	Component width. Unit: px
height	number	Yes	Component height. Unit: px

Offset

System capability: SystemCapability.ArkUI.ArkUI.Full

Name	Type	Mandatory	Description
x	number	Yes	X coordinate. Unit: px
y	number	Yes	Y coordinate. Unit: px

TranslateResult

System capability: SystemCapability.ArkUI.ArkUI.Full

Name	Type	Mandatory	Description
x	number	Yes	Translation distance along the x-axis. Unit: px
y	number	Yes	Translation distance along the y-axis. Unit: px
z	number	Yes	Translation distance along the z-axis. Unit: px

ScaleResult

System capability: SystemCapability.ArkUI.ArkUI.Full

Name	Type	Mandatory	Description
x	number	Yes	Scale factor along the x-axis. Unit: px
y	number	Yes	Scale factor along the y-axis. Unit: px
z	number	Yes	Scale factor along the z-axis. Unit: px
centerX	number	Yes	X coordinate of the center point. Unit: px
centerY	number	Yes	Y coordinate of the center point. Unit: px

RotateResult

System capability: SystemCapability.ArkUI.ArkUI.Full

Name	Type	Mandatory	Description
x	number	Yes	X coordinate of the rotation vector. Unit: px
y	number	Yes	Y coordinate of the rotation vector. Unit: px
z	number	Yes	Z coordinate of the rotation vector. Unit: px
angle	number	Yes	Rotation angle. Unit: px
centerX	number	Yes	X coordinate of the center point. Unit: px
centerY	number	Yes	Y coordinate of the center point. Unit: px

Matrix4Result

System capability: SystemCapability.ArkUI.ArkUI.Full

Value Range	Description
[number,number,number,number, number,number,number,number, number,number,number,number, number,number,number,number]	A number array whose length is 16 (4 x 4). The unit is px. For details, see 4 x 4 matrix description.

4 x 4 matrix description

Name	Type	Mandatory	Description
m00	number	Yes	Scale factor along the x-axis. Defaults to 1 for the identity matrix.
m01	number	Yes	The second value, which is affected by the rotation of the x, y, and z axes.
m02	number	Yes	The third value, which is affected by the rotation of the x, y, and z axes.
m03	number	Yes	Meaningless value.
m10	number	Yes	The fifth value, which is affected by the rotation of the x, y, and z axes.
m11	number	Yes	Scale factor along the y-axis. Defaults to 1 for the identity matrix.
m12	number	Yes	The seventh value, which is affected by the rotation of the x, y, and z axes.
m13	number	Yes	Meaningless value.
m20	number	Yes	The ninth value, which is affected by the rotation of the x, y, and z axes.
m21	number	Yes	The tenth value, which is affected by the rotation of the x, y, and z axes.
m22	number	Yes	Scale factor along the z-axis. Defaults to 1 for the identity matrix.
m23	number	Yes	Meaningless value.
m30	number	Yes	Translation value of the x-axis, in px. Defaults to 0 for the unit matrix.
m31	number	Yes	Translation value of the y-axis, in px. The default value is 0 for the identity matrix.
m32	number	Yes	Translation value of the z-axis, in px. The default value is 0 for the identity matrix.
m33	number	Yes	Valid in homogeneous coordinates, presenting the perspective projection effect.

Example

import matrix4 from '@ohos.matrix4';
import componentUtils from '@ohos.arkui.componentUtils';

@Entry
@Component
struct Utils{
  private getComponentRect(key:string) {
    console.info("Mode Key: " + key);
    let modePosition = componentUtils.getRectangleById(key);

    let localOffsetWidth = modePosition.size.width;
    let localOffsetHeight = modePosition.size.height;
    let localOffsetX = modePosition.localOffset.x;
    let localOffsetY = modePosition.localOffset.y;

    let windowOffsetX = modePosition.windowOffset.x;
    let windowOffsetY = modePosition.windowOffset.y;

    let screenOffsetX = modePosition.screenOffset.x;
    let screenOffsetY = modePosition.screenOffset.y;

    let translateX = modePosition.translate.x;
    let translateY = modePosition.translate.y;
    let translateZ = modePosition.translate.z;

    let scaleX = modePosition.scale.x;
    let scaleY = modePosition.scale.y;
    let scaleZ = modePosition.scale.z;
    let scaleCenterX = modePosition.scale.centerX;
    let scaleCenterY = modePosition.scale.centerY;

    let rotateX = modePosition.rotate.x;
    let rotateY = modePosition.rotate.y;
    let rotateZ = modePosition.rotate.z;
    let rotateCenterX = modePosition.rotate.centerX;
    let rotateCenterY = modePosition.rotate.centerY;
    let rotateAngle = modePosition.rotate.angle;

    let Matrix4_1 = modePosition.transform[0];
    let Matrix4_2 = modePosition.transform[1];
    let Matrix4_3 = modePosition.transform[2];
    let Matrix4_4 = modePosition.transform[3];
    let Matrix4_5 = modePosition.transform[4];
    let Matrix4_6 = modePosition.transform[5];
    let Matrix4_7 = modePosition.transform[6];
    let Matrix4_8 = modePosition.transform[7];
    let Matrix4_9 = modePosition.transform[8];
    let Matrix4_10 = modePosition.transform[9];
    let Matrix4_11 = modePosition.transform[10];
    let Matrix4_12 = modePosition.transform[11];
    let Matrix4_13 = modePosition.transform[12];
    let Matrix4_14 = modePosition.transform[13];
    let Matrix4_15 = modePosition.transform[14];
    let Matrix4_16 = modePosition.transform[15];
    console.info("[getRectangleById] current component obj is: " + modePosition );
  }
  @State x: number = 120;
  @State y: number = 10;
  @State z: number = 100;
  private matrix1 = matrix4.identity().translate({ x: this.x, y: this.y, z: this.z });
  build() {
    Column() {
        Image($r("app.media.icon"))
          .transform(this.matrix1)
          .translate({ x: 100, y: 10, z: 50})
          .scale({ x: 2, y: 0.5, z: 1 })
          .rotate({
            x: 1,
            y: 1,
            z: 1,
            centerX: '50%',
            centerY: '50%',
            angle: 300
          })
          .width("40%")
          .height(100)
          .key("image_01")
      Button() {
        Text('getRectangleById').fontSize(40).fontWeight(FontWeight.Bold);
      }.margin({ top: 20 })
      .onClick(() => {
        this.getComponentRect("image_01");
      }).id('onClick');
    }
  }
}