HarmonyOS CustomDialogController自定义弹窗，如何实现从下往上弹出动画

打开Dialog的autoCancel属性可以做到自定义出场动画，demo如下：

// 弹窗交互
@CustomDialog
@Component
struct CustomDialogExample {

  controller: CustomDialogController = new CustomDialogController({
    builder: CustomDialogExample({}),
    autoCancel:false
  })

  @State showFlag: Visibility = Visibility.Visible;
  @State isAutoCancel: boolean = false;

  build() {
    Column() {
      Text('我是内容').fontSize(20).margin({ top: 10, bottom: 10 })
        .backgroundColor('#FFFFFF')
        .textAlign(TextAlign.Center)
        .height(200)
        .width('100%')
        .margin({top:600})
        .onClick(()=>{
          this.cancel();
        })
    }
    .width('100%')
    .height('100%')
    .margin({
      bottom: -15
    })
    .onClick(()=>{
      if(this.isAutoCancel){
        this.cancel();
      }
    })
    .visibility(this.showFlag)
    .transition(TransitionEffect.OPACITY.animation({duration: 1000}).combine(TransitionEffect.translate({y: 100})))
  }

  cancel(){
    this.showFlag=Visibility.Hidden
    setTimeout(()=>{
      this.controller.close()
    }, 1000)
  }
}

@Entry
@Component
struct CustomDialogUser {
  @State isAutoCancel: boolean = false;

  dialogController: CustomDialogController = new CustomDialogController({
    builder: CustomDialogExample({ isAutoCancel: this.isAutoCancel }),
    autoCancel: this.isAutoCancel,
    customStyle:true
  })

  build() {
    Column() {
      Button('click me')
        .onClick(() => {
          this.dialogController.open()
        })
    }.width('100%').height('100%').margin({ top: 5 })
    .onClick(()=>{
    })
  }
}