ListItemGroup

The <ListItemGroup> component is used to display list item groups. It must be used with the <List> component and, if not otherwise specified, takes up the entire width of the <List>.

NOTE

• This component is supported since API version 9. Updates will be marked with a superscript to indicate their earliest API version.
• This component can be used only as a child of <List>.

Usage Guidelines

If the listDirection attribute of the parent <List> component is set to Axis.Vertical, the height attribute of the <ListItemGroup> component is fixed at the sum of the component’s header height, footer height, and total height of the list items. If the listDirection attribute of the parent <List> component is set to Axis.Horizontal, the width attribute of the <ListItemGroup> component is fixed at the sum of the component’s header width, footer width, and total width of the list items.

The list items in the <ListItemGroup> component cannot be edited or dragged. That is, their editable attribute does not take effect.

Child Components

This component supports the <ListItem> child component.

APIs

ListItemGroup(options?: {header?: CustomBuilder, footer?: CustomBuilder, space?: number|string, style?: ListItemGroupStyle})

Parameters

Attributes

ListItemGroupStyle¹⁰⁺

NOTE

The <ListItemGroup> component does not support the universal attribute aspectRatio.

If the main axis of <ListItemGroup> runs in the vertical direction, the height setting does not take effect.

If the main axis of <ListItemGroup> runs in the horizontal direction, the width setting does not take effect.

Example

Example 1

// xxx.ets
@Entry
@Component
struct ListItemGroupExample {
  private timetable: TimeTable[] = [
    {
      title: 'Monday',
      projects: ['Language', 'Math', 'English']
    },
    {
      title: 'Tuesday',
      projects: ['Physics', 'Chemistry', 'Biologics']
    },
    {
      title: 'Wednesday',
      projects: ['History', 'Geography', 'Politics']
    },
    {
      title: 'Thursday',
      projects: ['Art', 'Music', 'Sports']
    }
  ]

  @Builder
  itemHead(text: string) {
    Text(text)
      .fontSize(20)
      .backgroundColor(0xAABBCC)
      .width("100%")
      .padding(10)
  }

  @Builder
  itemFoot(num: number) {
    Text(''Total lessons:'+ num")
      .fontSize(16)
      .backgroundColor(0xAABBCC)
      .width("100%")
      .padding(5)
  }

  build() {
    Column() {
      List({ space: 20 }) {
        ForEach(this.timetable, (item: TimeTable) => {
          ListItemGroup({ header: this.itemHead(item.title), footer: this.itemFoot(item.projects.length) }) {
            ForEach(item.projects, (project: string) => {
              ListItem() {
                Text(project)
                  .width("100%")
                  .height(100)
                  .fontSize(20)
                  .textAlign(TextAlign.Center)
                  .backgroundColor(0xFFFFFF)
              }
            }, (item: string) => item)
          }
          .divider ({ strokeWidth: 1,color:Color.Blue }) // Divider between lines
        })
      }
      .width('90%')
      .sticky(StickyStyle.Header|StickyStyle.Footer)
      .scrollBar(BarState.Off)
    }.width('100%').height('100%').backgroundColor(0xDCDCDC).padding({ top: 5 })
  }
}

interface TimeTable {
  title: string;
  projects: string[];
}

Example 2

// xxx.ets
@Entry
@Component
struct ListItemGroupExample2 {
  private arr: ArrObject[] = [
    {
      style: ListItemGroupStyle.CARD,
      itemStyles: [ListItemStyle.CARD, ListItemStyle.CARD, ListItemStyle.CARD]
    },
    {
      style: ListItemGroupStyle.CARD,
      itemStyles: [ListItemStyle.CARD, ListItemStyle.CARD, ListItemStyle.NONE]
    },
    {
      style: ListItemGroupStyle.CARD,
      itemStyles: [ListItemStyle.CARD, ListItemStyle.NONE, ListItemStyle.CARD]
    },
    {
      style: ListItemGroupStyle.NONE,
      itemStyles: [ListItemStyle.CARD, ListItemStyle.CARD, ListItemStyle.NONE]
    }
  ]

  build() {
    Column() {
      List({ space: "4vp", initialIndex: 0 }) {
        ForEach(this.arr, (item: ArrObject, index?: number) => {
          ListItemGroup({ style: item.style }) {
            ForEach(item.itemStyles, (itemStyle: number, itemIndex?: number) => {
              ListItem({ style: itemStyle }) {
                if (index != undefined && itemIndex != undefined) {
                  Text("Item" + (itemIndex + 1) +" in group" + (index + 1) +" ")
                    .width("100%")
                    .textAlign(TextAlign.Center)
                }
              }
            }, (item: string) => item)
          }
        })
      }
      .width('100%')
      .multiSelectable(true)
      .backgroundColor(0xDCDCDC) // List in light blue
    }
    .width('100%')
    .padding({ top: 5 })
  }
}

interface ArrObject {
  style: number;
  itemStyles: number[];
}

你可能感兴趣的鸿蒙文章

harmony 鸿蒙ArkTS-based Declarative Development Paradigm

harmony 鸿蒙@ohos.multimedia.avCastPicker (AVCastPicker)

harmony 鸿蒙Property Animation

harmony 鸿蒙Enums

harmony 鸿蒙Blank

harmony 鸿蒙Button

harmony 鸿蒙CalendarPicker

harmony 鸿蒙Checkbox

harmony 鸿蒙CheckboxGroup

harmony 鸿蒙DataPanel