@ohos.arkui.advanced.TreeView（树视图）

树视图作为一种分层显示的列表，适合显示嵌套结构。拥有父列表项和子列表项，可展开或折叠。

用于效率型应用，如备忘录、电子邮件、图库中的侧边导航栏中。

说明：

该组件从API Version 10开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。

导入模块

import { TreeView } from "@ohos.arkui.advanced.TreeView"

子组件

无

属性

不支持通用属性

TreeView

TreeView({ treeController: TreeController })

装饰器类型：\@Component

系统能力： SystemCapability.ArkUI.ArkUI.Full

参数：

TreeController

树视图组件的控制器，可以将此对象绑定至树视图组件，然后通过它控制树的节点信息，同一个控制器不可以控制多个树视图组件。

addNode

addNode(nodeParam?: NodeParam): void

点击某个节点后，调用该方法可以触发新增孩子节点

参数：

removeNode

removeNode(): void

点击某个节点后，调用该方法可以触发删除该节点

modifyNode

modifyNode(): void

点击某个节点后，调用该方法可以触发修改该节点

buildDone

buildDone(): void

建立树视图。节点增加完毕后，必须调用该方法，触发树信息的保存

refreshNode

refreshNode(parentId: number, parentSubTitle: ResourceStr, currentSubtitle: ResourceStr): void

参数：

NodeParam

TreeListenerManager

树视图组件的监听器，可以将此对象绑定至树视图组件，然后通过它监听树的节点的变化，同一个监听器不可以控制多个树视图组件。

getInstance

getInstance(): TreeListenerManager

获取监听管理器单例对象

getTreeListener()

getTreeListener(): TreeListener

获取监听器

TreeListener

树视图组件的监听器，可以将此对象绑定至树视图组件，然后通过它监听树的节点的变化，同一个监听器不可以控制多个树视图组件。

on

on(type: TreeListenType, callback: (callbackParam: CallbackParam) => void): void;

注册监听

参数：

once

once(type: TreeListenType, callback: (callbackParam: CallbackParam) => void): void;

注册一次监听

参数：

off

off(type: TreeListenType, callback?: (callbackParam: CallbackParam) => void): void;

取消监听

参数：

TreeListenType

CallbackParam

事件

不支持通用事件

示例

import { TreeController, TreeListener, TreeListenerManager, TreeListenType, NodeParam, TreeView, CallbackParam } from '@ohos.arkui.advanced.TreeView'

@Entry
@Component
struct TreeViewDemo {
  private treeController: TreeController = new TreeController();
  private treeListener: TreeListener = TreeListenerManager.getInstance().getTreeListener();
  @State clickNodeId: number = 0;
  @State numbers: string[] = ['one', 'two', 'three', 'four', 'five', 'six'];

  aboutToDisappear(): void {
    this.treeListener.off(TreeListenType.NODE_CLICK, null);
    this.treeListener.off(TreeListenType.NODE_ADD, null);
    this.treeListener.off(TreeListenType.NODE_DELETE, null);
  }

  aboutToAppear(): void {
    this.treeListener.on(TreeListenType.NODE_MOVE, (callbackParam: CallbackParam) => {
    })
    this.treeListener.on(TreeListenType.NODE_CLICK, (callbackParam: CallbackParam) => {
    })

    let normalResource: Resource = $r('app.media.ic_public_collect_normal');
    let selectedResource: Resource = $r('app.media.ic_public_collect_selected');
    let editResource: Resource = $r('app.media.ic_public_collect_edit');
    let nodeParam: NodeParam = { parentNodeId:-1, currentNodeId: 1, isFolder: true, icon: normalResource, selectedIcon: selectedResource,
      editIcon: editResource, primaryTitle: "目录1验证悬浮框自适应效果是否OK",
      secondaryTitle: "6" };
    this.treeController
      .addNode(nodeParam)
      .addNode({parentNodeId:1, currentNodeId: 2, isFolder: false, primaryTitle: "项目1_1" })
      .addNode({ parentNodeId:-1, currentNodeId: 7, isFolder: true, primaryTitle: "目录2" })
      .addNode({ parentNodeId:-1, currentNodeId: 23, isFolder: true, icon: normalResource, selectedIcon: selectedResource,
        editIcon: editResource, primaryTitle: "目录3" })
      .addNode({ parentNodeId:-1, currentNodeId: 24, isFolder: false, primaryTitle: "项目4" })
      .addNode({ parentNodeId:-1, currentNodeId: 31, isFolder: true, icon: normalResource, selectedIcon: selectedResource,
        editIcon: editResource, primaryTitle: "目录5", secondaryTitle: "0" })
      .addNode({ parentNodeId:-1, currentNodeId: 32, isFolder: true, icon: normalResource, selectedIcon: selectedResource,
        editIcon: editResource, primaryTitle: "目录6", secondaryTitle: "0" })
      .addNode({ parentNodeId:32, currentNodeId: 35, isFolder: true, icon: normalResource, selectedIcon: selectedResource,
        editIcon: editResource, primaryTitle: "目录6-1", secondaryTitle: "0" })
      .addNode({ parentNodeId:-1, currentNodeId: 33, isFolder: true, icon: normalResource, selectedIcon: selectedResource,
        editIcon: editResource, primaryTitle: "目录7", secondaryTitle: "0" })
      .addNode({ parentNodeId:33, currentNodeId: 34, isFolder: false, primaryTitle: "项目8" })
      .addNode({ parentNodeId:-1, currentNodeId: 36, isFolder: false, primaryTitle: "项目9" })
      .buildDone();
  }

  build() {
    SideBarContainer(SideBarContainerType.Embed)
    {
      TreeView({ treeController: this.treeController })
      Row() {
        Divider().vertical(true).strokeWidth(2).color(0x000000).lineCap(LineCapStyle.Round)
        Column() {
          Row() {
            Text('ClickNodeId=' + this.clickNodeId).fontSize('16fp')
            Button('Add', { type: ButtonType.Normal, stateEffect: true })
              .borderRadius(8).backgroundColor(0x317aff).width(90)
              .onClick((event: ClickEvent) => {
                this.treeController.addNode();
              })
            Button('Modify', { type: ButtonType.Normal, stateEffect: true })
              .borderRadius(8).backgroundColor(0x317aff).width(90)
              .onClick((event: ClickEvent) => {
                this.treeController.modifyNode();
              })
            Button('Remove', { type: ButtonType.Normal, stateEffect: true })
              .borderRadius(8).backgroundColor(0x317aff).width(120)
              .onClick((event: ClickEvent) => {
                this.treeController.removeNode();
              })
          }
        }.height('100%').width('70%').alignItems(HorizontalAlign.Start)
      }
    }
    .focusable(true)
    .showControlButton(false)
    .showSideBar(true)
  }
}

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