HarmonyOS 鸿蒙Next 跑马灯组件Marquee的使用

HarmonyOS 鸿蒙Next 跑马灯组件Marquee的使用 HarmonyOS 鸿蒙Next 跑马灯组件，用于滚动展示一段单行文本。仅当文本内容宽度超过跑马灯组件宽度时滚动，不超过时不滚动。 用法：

// xxx.ets
@Entry
@Component
struct MarqueeExample {
  @State start: boolean = false
  @State src: string = ''
  @State marqueeText: string = 'Running Marquee'
  private fromStart: boolean = true
  private step: number = 10
  private loop: number = Number.POSITIVE_INFINITY
  controller: TextClockController = new TextClockController()
  convert2time(value: number): string{
    let date = new Date(Number(value+'000'));
    let hours = date.getHours().toString().padStart(2, '0');
    let minutes = date.getMinutes().toString().padStart(2, '0');
    let seconds = date.getSeconds().toString().padStart(2, '0');
    return hours+ ":" + minutes + ":" + seconds;
  }

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Marquee({
        start: this.start,
        step: this.step,
        loop: this.loop,
        fromStart: this.fromStart,
        src: this.marqueeText + this.src
      })
        .marqueeUpdateStrategy(MarqueeUpdateStrategy.PRESERVE_POSITION)
        .width(300)
        .height(80)
        .fontColor('#FFFFFF')
        .fontSize(48)
        .fontWeight(700)
        .backgroundColor('#182431')
        .margin({ bottom: 40 })
        .onStart(() => {
          console.info('Marquee animation complete onStart')
        })
        .onBounce(() => {
          console.info('Marquee animation complete onBounce')
        })
        .onFinish(() => {
          console.info('Marquee animation complete onFinish')
        })
      Button('Start')
        .onClick(() => {
          this.start = true
          //启动文本时钟
          this.controller.start()
        })
        .width(120)
        .height(40)
        .fontSize(16)
        .fontWeight(500)
        .backgroundColor('#007DFF')
      TextClock({ timeZoneOffset: -8, controller: this.controller })
        .format('hms')
        .onDateChange((value: number) => {
          this.src = this.convert2time(value);
        })
        .margin(20)
        .fontSize(30)
    }
    .width('100%')
    .height('100%')
  }
}

HarmonyOS 鸿蒙Next 跑马灯组件Marquee官方文档：

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-basic-components-marquee-V5