feat: 实现 OnDragItemEndAsync 逻辑

Author: ArgoZhang

src/BootstrapBlazor/Components/TreeView/TreeView.razor.cs

@@ -278,7 +278,7 @@ public partial class TreeView<TItem> : IModelEqualityComparer<TItem>
     /// 获得/设置 拖动标签页结束回调方法
     /// </summary>
     [Parameter]
-    public Func<TreeViewItem<TItem>, Task>? OnDragItemEndAsync { get; set; }
+    public Func<TreeViewDragContext<TItem>, Task>? OnDragItemEndAsync { get; set; }
 
     [Inject]
     [NotNull]
@@ -427,7 +427,15 @@ public async ValueTask TriggerKeyDown(string key)
     [JSInvokable]
     public async ValueTask TriggerDragEnd(int originIndex, int currentIndex, bool isChildren)
     {
-
+        if (OnDragItemEndAsync != null)
+        {
+            var context = new TreeViewDragContext<TItem>(
+                source: Rows[originIndex],
+                target: Rows[currentIndex],
+                children: isChildren
+            );
+            await OnDragItemEndAsync(context);
+        }
     }
 
     /// <summary>

src/BootstrapBlazor/Components/TreeView/TreeViewDragContext.cs

@@ -0,0 +1,27 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License
+// See the LICENSE file in the project root for more information.
+// Maintainer: Argo Zhang([email protected]) Website: https://www.blazor.zone
+
+namespace BootstrapBlazor.Components;
+
+/// <summary>
+/// <see cref="TreeView{TItem}"/> 组件拖动上下文类
+/// </summary>
+public class TreeViewDragContext<TItem>(TreeViewItem<TItem> source, TreeViewItem<TItem> target, bool children = false)
+{
+    /// <summary>
+    /// 获得 源节点
+    /// </summary>
+    public TreeViewItem<TItem> Source => source;
+
+    /// <summary>
+    /// 获得 目标节点
+    /// </summary>
+    public TreeViewItem<TItem> Target => target;
+
+    /// <summary>
+    /// 获得 是否未目标节点的子节点
+    /// </summary>
+    public bool IsChildren => children;
+}