wpf popup点击外部后自动关闭

通过InputManager.Current.PreProcessInput在触摸事件执行前检测popup状态
如果点击在Popup外部则关闭

    protected override void OnActivated(EventArgs e)
    {
        base.OnActivated(e);
        InputManager.Current.PreProcessInput += (s, args) =>
        {
            if (args.StagingItem.Input is TouchEventArgs touchEvent &&
                touchEvent.RoutedEvent == UIElement.PreviewTouchDownEvent)
            {
                var popList = new List<Popup>() { popIsFirstPage, popIsLastPage, popIsFirstQuestion, popIsLastQuestion,
                    popExit, popSelectPen,  popSelectErase, popClass, popWrongQuestion };
                foreach (var item in popList)
                {
                    if (item.IsOpen)
                    {
                        // 判断是否点击在 Popup 外部
                        if (!IsTouchWithinPopup(touchEvent.GetTouchPoint(item.Child), item))
                        {
                            item.IsOpen = false;
                        }
                    }
                }
            }
        };
    }
     private bool IsTouchWithinPopup(TouchPoint touchPoint, Popup popup)
     {
         if (popup.Child is FrameworkElement child)
         {
             // 获取Popup子元素的边界矩形
             Rect bounds = new Rect(0, 0, child.ActualWidth, child.ActualHeight);

             // 将触摸点坐标转换为相对于子元素的坐标
             Point relativePoint = touchPoint.Position;

             // 判断坐标是否在边界内
             return bounds.Contains(relativePoint);
         }
         return false;
     }