优化更新代码，添加界面功能并整合

WPFluent/Controls/Primitives/CustomPopupPlacementHelper.cs

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+using System;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+using System.Windows.Media;
+
+namespace WPFluent.Controls.Primitives;
+
+internal static class CustomPopupPlacementHelper
+{
+    public static readonly DependencyProperty PlacementProperty =
+        DependencyProperty.RegisterAttached("Placement", typeof(CustomPlacementMode), typeof(CustomPopupPlacementHelper), new PropertyMetadata(CustomPlacementMode.Top));
+
+    public static CustomPlacementMode GetPlacement(DependencyObject element)
+    {
+        return (CustomPlacementMode)element.GetValue(PlacementProperty);
+    }
+
+    public static void SetPlacement(DependencyObject element, CustomPlacementMode value)
+    {
+        element.SetValue(PlacementProperty, value);
+    }
+
+    internal static CustomPopupPlacement[] PositionPopup(
+        CustomPlacementMode placement,
+        Size popupSize,
+        Size targetSize,
+        Point offset,
+        FrameworkElement child = null!)
+    {
+        Matrix transformToDevice = default;
+        if (child != null)
+        {
+            Helper.TryGetTransformToDevice(child, out transformToDevice);
+        }
+
+        var preferredPlacement = CalculatePopupPlacement(placement, popupSize, targetSize, offset, child!, transformToDevice);
+
+        CustomPopupPlacement? alternativePlacement = null;
+        var alternativePlacementMode = GetAlternativePlacementMode(placement);
+        if (alternativePlacementMode.HasValue)
+        {
+            alternativePlacement = CalculatePopupPlacement(alternativePlacementMode.Value, popupSize, targetSize, offset, child!, transformToDevice);
+        }
+
+        if (alternativePlacement.HasValue)
+        {
+            return [preferredPlacement, alternativePlacement.Value];
+        }
+        else
+        {
+            return [preferredPlacement];
+        }
+    }
+
+    private static CustomPopupPlacement CalculatePopupPlacement(
+        CustomPlacementMode placement,
+        Size popupSize,
+        Size targetSize,
+        Point offset,
+        FrameworkElement child = null!,
+        Matrix transformToDevice = default)
+    {
+        Point point;
+        PopupPrimaryAxis primaryAxis;
+
+        switch (placement)
+        {
+            case CustomPlacementMode.Top:
+                point = new Point((targetSize.Width - popupSize.Width) / 2, -popupSize.Height);
+                primaryAxis = PopupPrimaryAxis.Horizontal;
+                break;
+
+            case CustomPlacementMode.Bottom:
+                point = new Point((targetSize.Width - popupSize.Width) / 2, targetSize.Height);
+                primaryAxis = PopupPrimaryAxis.Horizontal;
+                break;
+
+            case CustomPlacementMode.Left:
+                point = new Point(-popupSize.Width, (targetSize.Height - popupSize.Height) / 2);
+                primaryAxis = PopupPrimaryAxis.Vertical;
+                break;
+
+            case CustomPlacementMode.Right:
+                point = new Point(targetSize.Width, (targetSize.Height - popupSize.Height) / 2);
+                primaryAxis = PopupPrimaryAxis.Vertical;
+                break;
+
+            case CustomPlacementMode.Full:
+                point = new Point((targetSize.Width - popupSize.Width) / 2, (targetSize.Height - popupSize.Height) / 2);
+                primaryAxis = PopupPrimaryAxis.None;
+                break;
+
+            case CustomPlacementMode.TopEdgeAlignedLeft:
+                point = new Point(0, -popupSize.Height);
+                primaryAxis = PopupPrimaryAxis.Horizontal;
+                break;
+
+            case CustomPlacementMode.TopEdgeAlignedRight:
+                point = new Point(targetSize.Width - popupSize.Width, -popupSize.Height);
+                primaryAxis = PopupPrimaryAxis.Horizontal;
+                break;
+
+            case CustomPlacementMode.BottomEdgeAlignedLeft:
+                point = new Point(0, targetSize.Height);
+                primaryAxis = PopupPrimaryAxis.Horizontal;
+                break;
+
+            case CustomPlacementMode.BottomEdgeAlignedRight:
+                point = new Point(targetSize.Width - popupSize.Width, targetSize.Height);
+                primaryAxis = PopupPrimaryAxis.Horizontal;
+                break;
+
+            case CustomPlacementMode.LeftEdgeAlignedTop:
+                point = new Point(-popupSize.Width, 0);
+                primaryAxis = PopupPrimaryAxis.Vertical;
+                break;
+
+            case CustomPlacementMode.LeftEdgeAlignedBottom:
+                point = new Point(-popupSize.Width, targetSize.Height - popupSize.Height);
+                primaryAxis = PopupPrimaryAxis.Vertical;
+                break;
+
+            case CustomPlacementMode.RightEdgeAlignedTop:
+                point = new Point(targetSize.Width, 0);
+                primaryAxis = PopupPrimaryAxis.Vertical;
+                break;
+
+            case CustomPlacementMode.RightEdgeAlignedBottom:
+                point = new Point(targetSize.Width, targetSize.Height - popupSize.Height);
+                primaryAxis = PopupPrimaryAxis.Vertical;
+                break;
+            //case CustomPopupPlacementMode.Auto:
+            default:
+                throw new ArgumentOutOfRangeException(nameof(placement));
+        }
+
+        if (child != null)
+        {
+            var childOffset = VisualTreeHelper.GetOffset(child);
+            if (transformToDevice != default)
+            {
+                childOffset = transformToDevice.Transform(childOffset);
+            }
+            point -= childOffset;
+        }
+
+        return new CustomPopupPlacement(point, primaryAxis);
+    }
+
+    private static CustomPlacementMode? GetAlternativePlacementMode(CustomPlacementMode placement)
+    {
+        switch (placement)
+        {
+            case CustomPlacementMode.Top:
+                return CustomPlacementMode.Bottom;
+
+            case CustomPlacementMode.Bottom:
+                return CustomPlacementMode.Top;
+
+            case CustomPlacementMode.Left:
+                return CustomPlacementMode.Right;
+
+            case CustomPlacementMode.Right:
+                return CustomPlacementMode.Left;
+
+            case CustomPlacementMode.Full:
+                return null;
+
+            case CustomPlacementMode.TopEdgeAlignedLeft:
+                return CustomPlacementMode.BottomEdgeAlignedLeft;
+
+            case CustomPlacementMode.TopEdgeAlignedRight:
+                return CustomPlacementMode.BottomEdgeAlignedRight;
+
+            case CustomPlacementMode.BottomEdgeAlignedLeft:
+                return CustomPlacementMode.TopEdgeAlignedLeft;
+
+            case CustomPlacementMode.BottomEdgeAlignedRight:
+                return CustomPlacementMode.TopEdgeAlignedRight;
+
+            case CustomPlacementMode.LeftEdgeAlignedTop:
+                return CustomPlacementMode.RightEdgeAlignedTop;
+
+            case CustomPlacementMode.LeftEdgeAlignedBottom:
+                return CustomPlacementMode.RightEdgeAlignedBottom;
+
+            case CustomPlacementMode.RightEdgeAlignedTop:
+                return CustomPlacementMode.RightEdgeAlignedTop;
+
+            case CustomPlacementMode.RightEdgeAlignedBottom:
+                return CustomPlacementMode.LeftEdgeAlignedBottom;
+            //case CustomPopupPlacementMode.Auto:
+            default:
+                return null;
+        }
+    }
+}
+
+internal enum CustomPlacementMode
+{
+    Top = 0,
+    Bottom = 1,
+    Left = 2,
+    Right = 3,
+    Full = 4,
+    TopEdgeAlignedLeft = 5,
+    TopEdgeAlignedRight = 6,
+    BottomEdgeAlignedLeft = 7,
+    BottomEdgeAlignedRight = 8,
+    LeftEdgeAlignedTop = 9,
+    LeftEdgeAlignedBottom = 10,
+    RightEdgeAlignedTop = 11,
+    RightEdgeAlignedBottom = 12,
+    //Auto = 13
+}
+
+file static class Helper
+{
+    public static bool TryGetTransformToDevice(Visual visual, out Matrix value)
+    {
+        var presentationSource = PresentationSource.FromVisual(visual);
+        if (presentationSource != null)
+        {
+            value = presentationSource.CompositionTarget.TransformToDevice;
+            return true;
+        }
+
+        value = default;
+        return false;
+    }
+}