HarmonyOS 自定义弹窗怎么设置自定义动画？

let anmDuration: number = 1000; // 弹窗交互  
@CustomDialog  
struct CustomDialogExample1 {  
  controller: CustomDialogController =  
    new CustomDialogController({ builder: CustomDialogExample({}), autoCancel: false })  
  @State showFlag: Visibility = Visibility.Visible;  
  @State isAutoCancel: boolean = false;  
  textController: TextAreaController = new TextAreaController()  
  build() {  
    Column() {  
      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.move(TransitionEdge.START).animation({ duration: anmDuration }))  
  }  
  cancel() {  
    this.showFlag = Visibility.Hidden  
    console.log("closeDialog")  
    setTimeout(() => {  
      this.controller.close()  
    }, anmDuration)  
  }  
}  
@Entry  
@Component  
struct CustomDialogUser {  
  @State isAutoCancel: boolean = true;  
  dialogController: CustomDialogController = new CustomDialogController({  
    builder: CustomDialogExample1({ isAutoCancel: this.isAutoCancel }),  
    autoCancel: this.isAutoCancel,  
    customStyle: true  
  })  
  build() {  
    Column() {  
      Button('click me').onClick(() => {  
        this.dialogController.open()  
      })  
    }.width('100%').height('100%')  
  }  
}
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