电脑端窗口预关闭实现

import AbilityConstant from '@ohos.app.ability.AbilityConstant'; 
import hilog from '@ohos.hilog'; 
import UIAbility from '@ohos.app.ability.UIAbility'; 
import Want from '@ohos.app.ability.Want'; 
import promptAction from '@ohos.promptAction'; 
 
 
export default class EntryAbility extends UIAbility { 
 
 
  onWindowStageCreate(windowStage: window.WindowStage) { 
    // Main window is created, set main page for this ability 
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate'); 
 
 
    windowStage.loadContent('pages/Index', (err, data) => { 
      if (err.code) { 
        hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? ''); 
        return; 
      } 
      hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? ''); 
    }); 
  } 
 
 
  onPrepareToTerminate() { 
    this.showPrompt() 
    console.log("demoTest 进入回调") 
    //开发者定义预关闭 
    return true //确定停止关闭 
  } 
 
 
  showPrompt() { 
    try { 
      promptAction.showDialog({ 
        title: '是否关闭窗口', 
        buttons: [ 
          { 
            text: '确认', 
            color: '#000000', 
          }, 
          { 
            text: '取消', 
            color: '#000000', 
          }, 
        ], 
      }) 
        .then(data => { 
          console.info('showActionMenu success, click button: ' + data.index); 
          //目前是两个按钮 
          if (data.index == 0) { 
            //确认销毁 
            this.context.terminateSelf() 
          } 
          //取消不做处理 
          if (data.index == 1) { 
          } 
        }) 
        .catch(err => { 
          console.info('showActionMenu error: ' + err); 
        }) 
    } catch (error) { 
      console.error(`showActionMenu args error code is ${error.code}, message is ${error.message}`); 
    } 
  } 
}