如何定义dialog动画，有人知道吗?

let anmDuration: number = 200; 
 
// 弹窗交互 
@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() { 
      Row() { 
        Text("自定义动画的弹窗") 
      } 
      .padding(8) 
      .backgroundColor('#FFFFFF') 
      .height(200) 
      .margin({ bottom: -5 }) 
      .width('100%') 
    } 
    .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) 
  } 
} 
 
@Entry 
@Component 
struct CustomDialogUser { 
  @State isAutoCancel: boolean = true; 
  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%') 
  } 
}