HarmonyOS 弹窗从屏幕底部向上弹出展示的动画如何实现？

参考示例：

// 弹窗交互
@Component
@CustomDialog
struct CustomDialogExample {
  controller: CustomDialogController = new CustomDialogController({
    builder: CustomDialogExample({}),
    autoCancel: false
  })
  @State showFlag: Visibility = Visibility.Visible;
  @State isAutoCancel: boolean = false;
  textController: TextAreaController = new TextAreaController()

  build() {
    Column() {
      Button('cancel')
        .onClick(()=>{
          this.cancel();
        })

      Row() {
        Text("自定义动画的弹窗")
      }
      .padding(8)
      .backgroundColor('#FFFFFF')
      .height(200)
      .margin({ bottom: 30 })
      .width('80%')
      .borderRadius(10)
    }
    .justifyContent(FlexAlign.End)
    .width('100%')
    .height("100%")
    .onClick(() => {
      console.log("dialogClick")
      if (this.isAutoCancel) {
        console.log("dialogClick2")
        this.cancel();
      }
    })
    .visibility(this.showFlag)
    .transition(TransitionEffect.OPACITY.animation({ duration: anmDuration })
      .combine(TransitionEffect.translate({ y: 100 })))
  }

  cancel() {
    this.showFlag = Visibility.Hidden
    console.log("closeDialog")
    setTimeout(() => {
      this.controller.close()
    }, anmDuration)
  }
}