application-dev/ui/arkts-user-defined-arktsNode-frameNode.md

# FrameNode

## Overview

For third-party frameworks with custom frontend definitions, converting specific DSL to ArkUI declarative descriptions is required. This process, which relies on additional data-driven bindings to the [Builder](../quick-start/arkts-builder.md), is complex and can be performance-intensive. Such frameworks typically leverage ArkUI's layout and event handling, as well as basic node operations and customization capabilities. While most components are customized, some built-in components are needed for mixed display. This is where [FrameNode](../reference/apis-arkui/js-apis-arkui-frameNode.md) comes into the picture.

FrameNode represents an entity node in the component tree. When used with custom placeholder containers such as [NodeContainer](../reference/apis-arkui/arkui-ts/ts-basic-components-nodecontainer.md), it allows for mounting and dynamically managing a custom node tree in the containers, including node addition, modification, and removal. Basic FrameNodes enable universal attribute setting, event callback setting, and full customization for measurement, layout, and rendering.

Moreover, the ArkUI framework enables obtaining and traversing proxy FrameNode objects for built-in components, known as proxy nodes, which facilitate UI tree traversal and allow for obtaining specific information about built-in components or registering additional event listeners.

## Creating and Removing Nodes

You can create and remove nodes with **FrameNode**. You can create a custom instance of **FrameNode** using its constructor, and the instance thereby created corresponds to an entity node. You can use the [dispose](../reference/apis-arkui/js-apis-arkui-frameNode.md#dispose12) API in **FrameNode** to break the binding with the entity node.

> **NOTE**
>
> - A valid **UIContext** object is required for creating a FrameNode. If no **UIContext** object is provided or if the provided one is invalid, an exception will be thrown during node creation.
>
> - Maintain UI context consistency for custom placeholder components to prevent display issues.
>
> - **FrameNode** objects are subject to garbage collection (GC) if not retained.

## Checking Whether a Node is Modifiable

Use [isModifiable](../reference/apis-arkui/js-apis-arkui-frameNode.md#ismodifiable12) to check whether the current node is a proxy for a built-in component. If a FrameNode serves as a proxy, it cannot be modified, which means you cannot change its properties or the structure of its child nodes.

## Obtaining the Corresponding RenderNode

Use the [getRenderNode](../reference/apis-arkui/js-apis-arkui-frameNode.md#getrendernode) API to obtain the RenderNode associated with the FrameNode. You can then perform operations on the obtained RenderNode object to dynamically modify the drawing-related properties of the FrameNode. For details about the properties that can be modified, see the RenderNode API documentation.

> **NOTE**
>
> - You cannot obtain the RenderNode for a built-in component's proxy FrameNode.
>
> - In **BuilderNode**, you can use [getFrameNode](../reference/apis-arkui/js-apis-arkui-builderNode.md#getframenode) to get the FrameNode object, and then use **getRenderNode** to obtain the RenderNode object of the corresponding root node.

## Operating the Node Tree

With **FrameNode**, you can add, delete, query, and modify nodes, thereby changing the subtree structure of non-proxy nodes; you can also query the parent-child relationships to obtain the results.

> **NOTE**
>
> Illegal operations for adding, deleting, or modifying nodes result in exceptions.
>
> Proxy nodes obtained through queries can only be used to obtain node information and cannot modify node properties; they do not hold the component entity nodes, meaning they do not affect the lifecycle of the corresponding nodes.
>
> Node queries only return UI-related nodes and do not include syntax nodes.
>
> In scenarios using custom components, you may query and obtain newly added nodes of the custom components, with the node type being **__Common__**.

```ts
import { BuilderNode, FrameNode, NodeController, UIContext } from '@kit.ArkUI';
import { BusinessError } from '@kit.BasicServicesKit';

const TEST_TAG: string = "FrameNode"

class Params {
  text: string = "this is a text"
}

@Builder
function buttonBuilder(params: Params) {
  Column({ space: 10 }) {
    Button(params.text)
      .fontSize(12)
      .borderRadius(8)
      .borderWidth(2)
      .backgroundColor(Color.Orange)

    Button(params.text)
      .fontSize(12)
      .borderRadius(8)
      .borderWidth(2)
      .backgroundColor(Color.Pink)
  }
}

class MyNodeController extends NodeController {
  public buttonNode: BuilderNode<[Params]> | null = null;
  public frameNode: FrameNode | null = null;
  public childList: Array<FrameNode> = new Array<FrameNode>();
  public rootNode: FrameNode | null = null;
  private uiContext: UIContext | null = null;
  private wrapBuilder: WrappedBuilder<[Params]> = wrapBuilder(buttonBuilder);

  makeNode(uiContext: UIContext): FrameNode | null {
    this.uiContext = uiContext;
    if (this.rootNode == null) {
      this.rootNode = new FrameNode(uiContext);
      this.rootNode.commonAttribute
        .width("50%")
        .height(100)
        .borderWidth(1)
        .backgroundColor(Color.Gray)
    }

    if (this.frameNode == null) {
      this.frameNode = new FrameNode(uiContext);
      this.frameNode.commonAttribute
        .width("100%")
        .height(50)
        .borderWidth(1)
        .position({ x: 200, y: 0 })
        .backgroundColor(Color.Pink);
      this.rootNode.appendChild(this.frameNode);
    }
    if (this.buttonNode == null) {
      this.buttonNode = new BuilderNode<[Params]>(uiContext);
      this.buttonNode.build(this.wrapBuilder, { text: "This is a Button" })
      this.rootNode.appendChild(this.buttonNode.getFrameNode())
    }
    return this.rootNode;
  }

  operationFrameNodeWithFrameNode(frameNode: FrameNode | undefined | null) {
    if (frameNode) {
      console.log(TEST_TAG + " get ArkTSNode success.")
      console.log(TEST_TAG + " check rootNode whether is modifiable " + frameNode.isModifiable());
    }
    if (this.uiContext) {
      let frameNode1 = new FrameNode(this.uiContext);
      let frameNode2 = new FrameNode(this.uiContext);
      frameNode1.commonAttribute.size({ width: 50, height: 50 })
        .backgroundColor(Color.Black)
        .position({ x: 50, y: 60 })
      frameNode2.commonAttribute.size({ width: 50, height: 50 })
        .backgroundColor(Color.Orange)
        .position({ x: 120, y: 60 })
      try {
        frameNode?.appendChild(frameNode1);
        console.log(TEST_TAG + " appendChild success ");
      } catch (err) {
        console.log(TEST_TAG + " appendChild fail :" + (err as BusinessError).code + " : " + (err as BusinessError).message);
      }
      try {
        frameNode?.insertChildAfter(frameNode2, null);
        console.log(TEST_TAG + " insertChildAfter success ");
      } catch (err) {
        console.log(TEST_TAG + " insertChildAfter fail : " + (err as BusinessError).code + " : " + (err as BusinessError).message);
      }
      setTimeout(() => {
        try {
          frameNode?.removeChild(frameNode?.getChild(0))
          console.log(TEST_TAG + " removeChild success ");
        } catch (err) {
          console.log(TEST_TAG + " removeChild fail : " + (err as BusinessError).code + " : " + (err as BusinessError).message);
        }
      }, 2000)
      setTimeout(() => {
        try {
          frameNode?.clearChildren();
          console.log(TEST_TAG + " clearChildren success ");
        } catch (err) {
          console.log(TEST_TAG + " clearChildren fail : " + (err as BusinessError).code + " : " + (err as BusinessError).message);
        }
      }, 4000)
    }
  }

  testInterfaceAboutSearch(frameNode: FrameNode | undefined | null): string {
    let result: string = "";
    if (frameNode) {
      result = result + `current node is ${frameNode.getNodeType()} \n`;
      result = result + `parent node is ${frameNode.getParent()?.getNodeType()} \n`;
      result = result + `child count is ${frameNode.getChildrenCount()} \n`;
      result = result + `first child node is ${frameNode.getFirstChild()?.getNodeType()} \n`;
      result = result + `second child node is ${frameNode.getChild(1)?.getNodeType()} \n`;
      result = result + `previousSibling node is ${frameNode.getPreviousSibling()?.getNodeType()} \n`;
      result = result + `nextSibling node is ${frameNode.getNextSibling()?.getNodeType()} \n`;
    }
    return result;
  }

  checkAppendChild(parent: FrameNode | undefined | null, child: FrameNode | undefined | null) {
    try {
      if (parent && child) {
        parent.appendChild(child);
        console.log(TEST_TAG + " appendChild success ");
      }
    } catch (err) {
      console.log(TEST_TAG + " appendChild fail : " + (err as BusinessError).code + " : " + (err as BusinessError).message);
    }
  }
}

@Entry
@Component
struct Index {
  @State index: number = 0;
  @State result: string = ""
  private myNodeController: MyNodeController = new MyNodeController();

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.SpaceBetween }) {
      List({ space: 20, initialIndex: 0 }) {
        ListItem() {
          Column({ space: 5 }) {
            Text("Verify the add, delete, and modify features of the FrameNode")
            Button("Operate Custom FrameNode")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                // Add, delete, and modify FrameNode child nodes, which is properly implemented.
                this.myNodeController.operationFrameNodeWithFrameNode(this.myNodeController?.frameNode);
              })
            Button("Operate Proxy Node in BuilderNode")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                // Add, delete, and modify the BuilderNode proxy nodes, which results in an exception.
                this.myNodeController.operationFrameNodeWithFrameNode(this.myNodeController?.buttonNode?.getFrameNode());
              })
            Button("Operate Proxy Node in Built-in Component")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                // Add, delete, and modify the proxy nodes, which results in an exception.
                this.myNodeController.operationFrameNodeWithFrameNode(this.myNodeController?.rootNode?.getParent());
              })
          }
        }

        ListItem() {
          Column({ space: 5 }) {
            Text("Verify the feature to add subnodes to FrameNode")
            Button("Add BuilderNode Proxy Node")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                let buttonNode = new BuilderNode<[Params]>(this.getUIContext());
                buttonNode.build(wrapBuilder<[Params]>(buttonBuilder), { text: "BUTTON" })
                this.myNodeController.checkAppendChild(this.myNodeController?.frameNode, buttonNode?.getFrameNode());
              })
            Button("Add Built-in Component Proxy Node")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                this.myNodeController.checkAppendChild(this.myNodeController?.frameNode, this.myNodeController?.rootNode?.getParent());
              })
            Button("Add Custom Node with Existing Parent Node")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                this.myNodeController.checkAppendChild(this.myNodeController?.frameNode, this.myNodeController?.rootNode);
              })
          }
        }

        ListItem() {
          Column({ space: 5 }) {
            Text("Verify the query feature of the FrameNode")
            Button("Operate Custom FrameNode")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                // Query the FrameNode. The current node is a child of the NodeContainer.
                this.result = this.myNodeController.testInterfaceAboutSearch(this.myNodeController?.rootNode);
                setTimeout(() => {
                  // Query the FrameNode. The current node is the first child node under rootNode.
                  this.result = this.myNodeController.testInterfaceAboutSearch(this.myNodeController?.frameNode);
                }, 2000)
              })
            Button("Operate Proxy Node in BuilderNode")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                // Query the BuilderNode proxy nodes. The current node is the Column node within BuilderNode.
                this.result = this.myNodeController.testInterfaceAboutSearch(this.myNodeController?.buttonNode?.getFrameNode());
              })
            Button("Operate Proxy Node in Built-in Component")
              .fontSize(16)
              .width(400)
              .onClick(() => {
                // Query the proxy node. The current node is the NodeContainer.
                this.result = this.myNodeController.testInterfaceAboutSearch(this.myNodeController?.rootNode?.getParent());
              })
          }
        }
      }.height("50%")

      Text(`Result: \n${this.result}`)
        .fontSize(16)
        .width(400)
        .height(200)
        .padding(30)
        .borderWidth(1)
      Column() {
        Text("This is a NodeContainer.")
          .textAlign(TextAlign.Center)
          .borderRadius(10)
          .backgroundColor(0xFFFFFF)
          .width('100%')
          .fontSize(16)
        NodeContainer(this.myNodeController)
          .borderWidth(1)
          .width(400)
          .height(150)
      }
    }
    .padding({ left: 35, right: 35, top: 35, bottom: 35 })
    .width("100%")
    .height("100%")
  }
}
```

## Setting Universal Attributes and Event Callbacks

Use the [commonAttribute](../reference/apis-arkui/js-apis-arkui-frameNode.md#commonattribute12) and [commonEvent](../reference/apis-arkui/js-apis-arkui-frameNode.md#commonevent12) objects to set the [universal attributes](../reference/apis-arkui/arkui-ts/ts-universal-attributes-size.md) and [event callbacks](../reference/apis-arkui/arkui-ts/ts-uicommonevent.md), respectively.

> **NOTE**
>
> - Proxy node attributes are immutable. Therefore, **commonAttribute** is ineffective on proxy nodes.
>
> - The custom basic events that you define run in parallel with the events predefined in the built-in components, without overriding them. When two event callbacks are set, the built-in component event callback is prioritized.

```ts
import { BuilderNode, FrameNode, NodeController, UIContext } from '@kit.ArkUI'

class Params {
  text: string = "this is a text"
}

@Builder
function buttonBuilder(params: Params) {
  Button(params.text)
    .fontSize(12)
    .borderRadius(8)
    .borderWidth(2)
    .backgroundColor(Color.Orange)
    .onClick((event: ClickEvent) => {
      console.log(`Button ${JSON.stringify(event)}`);
    })
}

class MyNodeController extends NodeController {
  public buttonNode: BuilderNode<[Params]> | null = null;
  public frameNode: FrameNode | null = null;
  public rootNode: FrameNode | null = null;
  private wrapBuilder: WrappedBuilder<[Params]> = wrapBuilder(buttonBuilder);

  makeNode(uiContext: UIContext): FrameNode | null {
    if (this.rootNode == null) {
      this.rootNode = new FrameNode(uiContext);
      // Modify the attributes of rootNode, which is a custom FrameNode, and the changes take effect.
      this.rootNode.commonAttribute
        .width("100%")
        .height(100)
        .borderWidth(1)
        .backgroundColor(Color.Gray)
    }

    if (this.frameNode == null) {
      this.frameNode = new FrameNode(uiContext);
      // Modify the attributes of frameNode, which is a custom FrameNode, and the changes take effect.
      this.frameNode.commonAttribute
        .width("50%")
        .height(50)
        .borderWidth(1)
        .backgroundColor(Color.Pink);
      this.rootNode.appendChild(this.frameNode);
    }
    if (this.buttonNode == null) {
      this.buttonNode = new BuilderNode<[Params]>(uiContext);
      this.buttonNode.build(this.wrapBuilder, { text: "This is a Button" })
      // Modify the attributes of the FrameNode obtained from BuilderNode, which is not a custom FrameNode, and the changes do not take effect.
      this.buttonNode?.getFrameNode()?.commonAttribute.position({ x: 100, y: 100 })
      this.rootNode.appendChild(this.buttonNode.getFrameNode())
    }
    return this.rootNode;
  }

  modifyNode(frameNode: FrameNode | null | undefined, sizeValue: SizeOptions, positionValue: Position) {
    if (frameNode) {
      frameNode.commonAttribute.size(sizeValue).position(positionValue);
    }
  }

  addClickEvent(frameNode: FrameNode | null | undefined) {
    if (frameNode) {
      frameNode.commonEvent.setOnClick((event: ClickEvent) => {
        console.log(`FrameNode ${JSON.stringify(event)}`);
      })
    }
  }
}

@Entry
@Component
struct Index {
  private myNodeController: MyNodeController = new MyNodeController();

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.SpaceBetween }) {
      Column({ space: 10 }) {
        Text("Modify the universal node attributes: width and height.")
        Button("modify ArkTS-FrameNode")
          .onClick(() => {
            // The object obtained is the FrameNode created on the current page, which can be modified. That is, the size and position of the node can be changed.
            console.log("Check whether the node can be modified " + this.myNodeController?.frameNode
            ?.isModifiable());
            this.myNodeController.modifyNode(this.myNodeController?.frameNode, { width: 150, height: 100 }, {
              x: 100,
              y: 0
            })
          })
        Button("modify FrameNode get by BuilderNode")
          .onClick(() => {
            // The object obtained is the root node of the BuilderNode on the current page, which cannot be modified. That is, the size and position of the node remain unchanged.
            console.log("Check the weather the node can be modified " + this.myNodeController?.buttonNode?.getFrameNode()
            ?.isModifiable());
            this.myNodeController.modifyNode(this.myNodeController?.buttonNode?.getFrameNode(), {
              width: 100,
              height: 100
            }, { x: 50, y: 50 })
          })
        Button("modify proxyFrameNode get by search")
          .onClick(() => {
            // The rootNode object calling getParent() obtains the NodeContainer node on the current page, which cannot be modified. That is, the size and position of the node remain unchanged.
            console.log("Check the weather the node can be modified " + this.myNodeController?.rootNode?.getParent()
            ?.isModifiable());
            this.myNodeController.modifyNode(this.myNodeController?.rootNode?.getParent(), {
              width: 500,
              height: 500
            }, {
              x: 0,
              y: 0
            })
          })
      }.padding({ left: 35, right: 35, top: 35, bottom: 35 })

      Column({ space: 10 }) {
        Text("Modify the node click event.")
        Button("add click event to ArkTS-FrameNode")
          .onClick(() => {
            // The object obtained is the FrameNode created on the current page, to which click events can be added.
            // The added click event participates in event competition, meaning the click event will be consumed by this node and will no longer bubble up to the parent component.
            console.log("Check the weather the node can be modified " + this.myNodeController?.rootNode?.getParent()
            ?.isModifiable());
            this.myNodeController.addClickEvent(this.myNodeController?.frameNode)
          })
        Button("add click event to FrameNode get by BuilderNode")
          .onClick(() => {
            // The object obtained is the root node of the BuilderNode on the current page, to which click events can be added.
            // When the button is clicked, the click event callback set through the built-in component API is called first, followed by the click listener added through commonEvent.
            console.log("Check the weather the node can be modified " + this.myNodeController?.buttonNode?.getFrameNode()
            ?.isModifiable());
            this.myNodeController.addClickEvent(this.myNodeController?.buttonNode?.getFrameNode())
          })
        Button("add click event to proxyFrameNode get by search")
          .onClick(() => {
            // The rootNode object calling getParent() obtains the NodeContainer node on the current page, to which click events can be added.
            console.log("Check the weather the node can be modified " + this.myNodeController?.rootNode?.getParent()
            ?.isModifiable());
            this.myNodeController.addClickEvent(this.myNodeController?.rootNode?.getParent());
          })
      }.padding({ left: 35, right: 35, top: 35, bottom: 35 })

      NodeContainer(this.myNodeController)
        .borderWidth(1)
        .width("100%")
        .height(100)
        .onClick((event: ClickEvent) => {
          console.log(`NodeContainer ${JSON.stringify(event)}`);
        })
    }
    .padding({ left: 35, right: 35, top: 35, bottom: 35 })
    .width("100%")
    .height("100%")
  }
}
```

## Implementing Custom Measurement, Layout, and Drawing

By overriding the [onDraw](../reference/apis-arkui/js-apis-arkui-frameNode.md#ondraw12) API, you can customize the drawing content of the FrameNode. Use the [invalidate](../reference/apis-arkui/js-apis-arkui-frameNode.md#invalidate12) API to manually trigger a redraw of the node.

By overriding the [onMeasure](../reference/apis-arkui/js-apis-arkui-frameNode.md#onmeasure12) API, you can customize how the FrameNode measures its size. Use [measure](../reference/apis-arkui/js-apis-arkui-frameNode.md#measure12) to proactively pass layout constraints to initiate a remeasurement.

By overriding the [onLayout](../reference/apis-arkui/js-apis-arkui-frameNode.md#onlayout12) API, you can customize the layout of the FrameNode. Use [layout](../reference/apis-arkui/js-apis-arkui-frameNode.md#layout12) to proactively pass position information and initiate a re-layout.

Use [setNeedsLayout](../reference/apis-arkui/js-apis-arkui-frameNode.md#setneedslayout12) to mark the current node and trigger a re-layout in the next frame.

> **NOTE**
>
> - After a node is disposed and unbound, the FrameNode no longer represents an entity node. In this case, the **invalidate** call cannot update the previously bound node.
>
> - Custom drawings made through the **onDraw** API cannot exceed the component's size.

```ts
import { DrawContext, FrameNode, NodeController, Position, Size, UIContext, LayoutConstraint } from '@kit.ArkUI';
import { drawing } from '@kit.ArkGraphics2D';

function GetChildLayoutConstraint(constraint: LayoutConstraint, child: FrameNode): LayoutConstraint {
  const size = child.getUserConfigSize();
  const width = Math.max(
    Math.min(constraint.maxSize.width, size.width.value),
    constraint.minSize.width
  );
  const height = Math.max(
    Math.min(constraint.maxSize.height, size.height.value),
    constraint.minSize.height
  );
  const finalSize: Size = { width, height };
  const res: LayoutConstraint = {
    maxSize: finalSize,
    minSize: finalSize,
    percentReference: finalSize
  };

  return res;
}

class MyFrameNode extends FrameNode {
  public width: number = 100;
  public offsetY: number = 0;
  private space: number = 1;

  onMeasure(constraint: LayoutConstraint): void {
    let sizeRes: Size = { width: vp2px(100), height: vp2px(100) };
    for (let i = 0;i < this.getChildrenCount(); i++) {
      let child = this.getChild(i);
      if (child) {
        let childConstraint = GetChildLayoutConstraint(constraint, child);
        child.measure(childConstraint);
        let size = child.getMeasuredSize();
        sizeRes.height += size.height + this.space;
        sizeRes.width = Math.max(sizeRes.width, size.width);
      }
    }
    this.setMeasuredSize(sizeRes);
  }

  onLayout(position: Position): void {
    let y = 0;
    for (let i = 0;i < this.getChildrenCount(); i++) {
      let child = this.getChild(i);
      if (child) {
        child.layout({
          x: vp2px(100),
          y: vp2px(this.offsetY)
        });
        y += child.getMeasuredSize().height + this.space;
      }
    }
    this.setLayoutPosition(position);
  }

  onDraw(context: DrawContext) {
    const canvas = context.canvas;
    const pen = new drawing.Pen();
    pen.setStrokeWidth(15);
    pen.setColor({ alpha: 255, red: 255, green: 0, blue: 0 });
    canvas.attachPen(pen);
    canvas.drawRect({
      left: 50,
      right: this.width + 50,
      top: 50,
      bottom: this.width + 50,
    });
    canvas.detachPen();
  }

  addWidth() {
    this.width = (this.width + 10) % 50 + 100;
  }
}

class MyNodeController extends NodeController {
  public rootNode: MyFrameNode | null = null;

  makeNode(context: UIContext): FrameNode | null {
    this.rootNode = new MyFrameNode(context);
    this.rootNode?.commonAttribute?.size({ width: 100, height: 100 }).backgroundColor(Color.Green);
    let frameNode: FrameNode = new FrameNode(context);
    this.rootNode.appendChild(frameNode);
    frameNode.commonAttribute.width(10).height(10).backgroundColor(Color.Pink);
    return this.rootNode;
  }
}

@Entry
@Component
struct Index {
  private nodeController: MyNodeController = new MyNodeController();

  build() {
    Row() {
      Column() {
        NodeContainer(this.nodeController)
          .width('100%')
          .height(200)
          .backgroundColor('#FFF0F0F0')
        Button('Invalidate')
          .margin(10)
          .onClick(() => {
            this.nodeController?.rootNode?.addWidth();
            this.nodeController?.rootNode?.invalidate();
          })
        Button('UpdateLayout')
          .onClick(() => {
            let node = this.nodeController.rootNode;
            node!.offsetY = (node!.offsetY + 10) % 110;
            this.nodeController?.rootNode?.setNeedsLayout();
          })
      }
      .width('100%')
      .height('100%')
    }
    .height('100%')
  }
}
```

## Searching for Nodes and Obtaining Basic Information

**FrameNode** provides APIs for obtaining basic information about an entity node. For details about the returned information, see the FrameNode API documentation.

To obtain a FrameNode, use any of the following methods:

1. Use [getFrameNodeById](../reference/apis-arkui/js-apis-arkui-UIContext.md#getframenodebyid12).

2. Use [getFrameNodeByUniqueId](../reference/apis-arkui/js-apis-arkui-UIContext.md#getframenodebyuniqueid12).

3. Use an [observer](../reference/apis-arkui/js-apis-arkui-observer.md).

> **NOTE**
>
> Currently, the following information can be obtained:
>
> - Node size: **getMeasuredSize**, **getUserConfigSize**
>
> - Layout information: **getPositionToWindow**, **getPositionToParent**, **getLayoutPosition**, **getUserConfigBorderWidth**, **getUserConfigPadding**, **getUserConfigMargin**
>
> - Node information: **getId**, **getUniqueId**, **getNodeType**, **getOpacity**, **isVisible**, **isClipToFrame**, **isAttached**, **getInspectorInfo**, **getCustomProperty**