布局約束

通過組件的寬高比和顯示優(yōu)先級(jí)約束組件顯示效果。

說明：
開發(fā)前請(qǐng)熟悉鴻蒙開發(fā)指導(dǎo)文檔 ：[gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md]
從API Version 7開始支持。后續(xù)版本如有新增內(nèi)容，則采用上角標(biāo)單獨(dú)標(biāo)記該內(nèi)容的起始版本。

屬性

示例

示例1

// xxx.ets
@Entry
@Component
struct AspectRatioExample {
  private children: string[] = ['1', '2', '3', '4', '5', '6']

  build() {
    Column({ space: 20 }) {
      Text('using container: row').fontSize(14).fontColor(0xCCCCCC).width('100%')
      Row({ space: 10 }) {
        ForEach(this.children, (item:string) = > {
          // 組件寬度 = 組件高度*1.5 = 90
          Text(item)
            .backgroundColor(0xbbb2cb)
            .fontSize(20)
            .aspectRatio(1.5)
            .height(60)
          // 組件高度 = 組件寬度/1.5 = 60/1.5 = 40
          Text(item)
            .backgroundColor(0xbbb2cb)
            .fontSize(20)
            .aspectRatio(1.5)
            .width(60)
        }, (item:string) = > item)
      }
      .size({ width: "100%", height: 100 })
      .backgroundColor(0xd2cab3)
      .clip(true)

      // grid子元素width/height=3/2
      Text('using container: grid').fontSize(14).fontColor(0xCCCCCC).width('100%')
      Grid() {
        ForEach(this.children, (item:string) = > {
          GridItem() {
            Text(item)
              .backgroundColor(0xbbb2cb)
              .fontSize(40)
              .width('100%')
              .aspectRatio(1.5)
          }
        }, (item:string) = > item)
      }
      .columnsTemplate('1fr 1fr 1fr')
      .columnsGap(10)
      .rowsGap(10)
      .size({ width: "100%", height: 165 })
      .backgroundColor(0xd2cab3)
    }.padding(10)
  }
}

圖1 豎屏顯示

圖2 橫屏顯示

示例2

class ContainerInfo {
  label: string = '';
  size: string = '';
}

class ChildInfo {
  text: string = '';
  priority: number = 0;
}

@Entry
@Component
struct DisplayPriorityExample {
  // 顯示容器大小
  private container: ContainerInfo[] = [
    { label: 'Big container', size: '90%' },
    { label: 'Middle container', size: '50%' },
    { label: 'Small container', size: '30%' }
  ]
  private children: ChildInfo[] = [
    { text: '1n(priority:2)', priority: 2 },
    { text: '2n(priority:1)', priority: 1 },
    { text: '3n(priority:3)', priority: 3 },
    { text: '4n(priority:1)', priority: 1 },
    { text: '5n(priority:2)', priority: 2 }
  ]
  @State currentIndex: number = 0;

  build() {
    Column({ space: 10 }) {
      // 切換父級(jí)容器大小
      Button(this.container[this.currentIndex].label).backgroundColor(0x317aff)
        .onClick(() = > {
          this.currentIndex = (this.currentIndex + 1) % this.container.length;
        })
      // 通過變量設(shè)置Flex父容器寬度
      Flex({ justifyContent: FlexAlign.SpaceBetween }) {
        ForEach(this.children, (item:ChildInfo) = > {
          // 使用displayPriority給子組件綁定顯示優(yōu)先級(jí)
          Text(item.text)
            .width(120)
            .height(60)
            .fontSize(24)
            .textAlign(TextAlign.Center)
            .backgroundColor(0xbbb2cb)
            .displayPriority(item.priority)
        }, (item:ChildInfo) = > item.text)
      }
      .width(this.container[this.currentIndex].size)
      .backgroundColor(0xd2cab3)
    }.width("100%").margin({ top: 50 })
  }
}

`HarmonyOS與OpenHarmony鴻蒙文檔籽料：mau123789是v直接拿`

橫屏顯示

審核編輯 黃宇