dialog底部弹起动画，想问下arkts如何实现控制dialog弹起收回的动画效果

let anmDuration: number = 800;  
  
// 弹窗交互  
@CustomDialog  
struct CustomDialogExample {  
  
  controller: CustomDialogController = new CustomDialogController({  
    builder: CustomDialogExample({}),  
    autoCancel:false  
  })  
  
  @State showFlag: Visibility = Visibility.Visible;  
  @State isAutoCancel: boolean = false;  
  
  build() {  
    Column() {  
      Text('点我关闭弹窗').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: anmDuration}).combine(TransitionEffect.translate({y: 100})))  
  }  
  
  cancel(){  
    this.showFlag=Visibility.Hidden  
    setTimeout(()=>{  
      this.controller.close()  
    }, anmDuration)  
  }  
}  
@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(()=>{  
    })  
  }  
}