HarmonyOS promptAction.openCustomDialog如何实现点击弹窗阴影区域时弹窗不关闭

可以使用 onWillDismiss方法。当用户执行点击遮障层关闭、左滑/右滑、三键back、键盘ESC关闭交互操作时，如果注册该回调函数，则不会立刻关闭弹窗。在回调函数中可以通过reason得到阻拦关闭弹窗的操作类型，从而根据原因选择是否能关闭弹窗。

参考示例如下：

import { BusinessError } from '@ohos.base';
import { ComponentContent } from "@ohos.arkui.node";
import { PromptAction } from '@kit.ArkUI';

//弹框属性
export class Params {
  text: string = ""
  backgroundColor: string = ""
  opacity: number = 1
  width: number = 0
  height: number = 0
  btnControl: string = ''
}

//自定义弹框
@Builder
function buildText(params: Params) {
  Column() {
    Text(params.text || '默认内容')
      .fontSize(50)
      .fontWeight(FontWeight.Bold)
      .margin({ bottom: 36 })
  }
  .width(params.width || 200)
  .height(params.height || 400)
  .backgroundColor(params.backgroundColor || '#FFF0F0F0')
  .opacity(params.opacity)
}

//弹框控制
export function setDialog(uiContext: UIContext, promptAction: PromptAction, params: Params) {
  let contentNode = new ComponentContent(uiContext, wrapBuilder(buildText), params);
  try {
    promptAction.openCustomDialog(contentNode, {
      onWillDismiss: (dismissDialogAction: DismissDialogAction) => {
        if (dismissDialogAction.reason == DismissReason.TOUCH_OUTSIDE) {
          console.log('点击遮罩层事件：',)
          if (params.btnControl !== '关闭控制') {
            dismissDialogAction.dismiss()
          }
        }
      }
    });
  } catch (error) {
    let message = (error as BusinessError).message;
    let code = (error as BusinessError).code;
    console.error(`OpenCustomDialog args error code is ${code}, message is ${message}`);
  }
}

@Entry
@Component
struct Index {
  @State message: string = "hello"
  private uiContext = this.getUIContext()
  private promptAction = this.getUIContext().getPromptAction()

  build() {
    Row() {
      Column() {
        Button("控制弹框关闭")
          .margin(10)
          .width('80%')
          .onClick(() => {
            let params: Params = new Params()
            params.btnControl = '关闭控制'
            setDialog(this.uiContext, this.promptAction, params)
          })
      }
      .width('100%')
      .height('100%')
    }
    .height('100%')
  }
}