HarmonyOS Button组件无法触发获取焦点和失去焦点事件？

Question

// xxx.ets
@Entry
@Component
struct FocusEventExample {
  @State oneButtonColor: string = '#FFC0CB'
  @State twoButtonColor: string = '#87CEFA'
  @State threeButtonColor: string = '#90EE90'

  build() {
    Column({ space: 20 }) {
      // 通过外接键盘的上下键可以让焦点在三个按钮间移动，按钮获焦时颜色变化，失焦时变回原背景色
      Button('First Button')
        .backgroundColor(this.oneButtonColor)
        .width(260)
        .height(70)
        .fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.oneButtonColor = '#FF0000'
        })
        .onBlur(() => {
          this.oneButtonColor = '#FFC0CB'
        })
      Button('Second Button')
        .backgroundColor(this.twoButtonColor)
        .width(260)
        .height(70)
        .fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.twoButtonColor = '#FF0000'
        })
        .onBlur(() => {
          this.twoButtonColor = '#87CEFA'
        })
      Button('Third Button')
        .backgroundColor(this.threeButtonColor)
        .width(260)
        .height(70)
        .fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.threeButtonColor = '#FF0000'
        })
        .onBlur(() => {
          this.threeButtonColor = '#90EE90'
        })
    }.width('100%').margin({ top: 20 })
  }
}

Answer 1

目前API可以使用defaultFocus(true)来设置当前组件是否为当前页面上的默认焦点，主动获焦/失焦使用focusControl中的方法requestFocus，而走焦需要按下TAB键来触发走焦，具体可参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/arkts-common-events-focus-event-V5