WIn_RustTools/Editor/EditorTreeView.cs


using System.Diagnostics;
using Microsoft.UI.Xaml.Controls;
namespace RustTools.Editor;

public class EditorTreeView : TreeView
{

    public EditorTreeView()
    {
        //点击事件
        this.ItemInvoked += TreeView_ItemInvoked;
//        TreeView.Expanding
//当用户点击小箭头展开节点时触发。

//TreeView.Collapsed
//当用户点击小箭头折叠节点时触发。
        this.Expanding += TreeView_Expanding;
        this.Collapsed += TreeView_Collapsed;
    }
    private async void TreeView_ItemInvoked(TreeView sender, TreeViewItemInvokedEventArgs args)
    {
        // 获取触发点击的 TreeViewItem
        var treeViewItem = sender.ContainerFromItem(args.InvokedItem) as TreeViewItem;


        if (args.InvokedItem is FileItem invokedItem)
        {
            if (invokedItem.IsFolder)
            {
                //invokedItem.Children.Clear();
                //Debug.WriteLine($"Folder clicked: {invokedItem.Name}");
                //// 异步加载子项数据
                //var newChildren = await Task.Run(() => EditorLoad.GetData(invokedItem.Dir));
                //// 更新 Children 集合
                //foreach (var child in newChildren)
                //{
                //    invokedItem.Children.Add(child);
                //}
                //// 展开 TreeViewItem
                //if (treeViewItem != null&&treeViewItem.IsExpanded==false)
                //{
                //    treeViewItem.IsExpanded = true;
                //}
            }
            else
            {
                Debug.WriteLine($"File clicked: {invokedItem.Name}");
                EditorWin.TabViewList.Add(new TabViewItem()
                {
                    Header = invokedItem.Name,
                });
            }
        }
    }



    // TreeView.Expanding 事件
    private async void TreeView_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
    {
        if (args.Item is FileItem expandingItem)
        {
            Debug.WriteLine($"Expanding: {expandingItem.Name}");

            // 如果需要动态加载子项（仅当没有加载过子项时）
            if (expandingItem.IsFolder)
            {
                expandingItem.Children.Clear();
                var newChildren = await Task.Run(() => EditorLoad.GetData(expandingItem.Dir));
                // 更新 Children 集合
                foreach (var child in newChildren)
                {
                    expandingItem.Children.Add(child);
                }
                Debug.WriteLine($"Loaded children for: {expandingItem.Name}");
            }
        }
    }

    // TreeView.Collapsed 事件
    private void TreeView_Collapsed(TreeView sender, TreeViewCollapsedEventArgs args)
    {
        if (args.Item is FileItem collapsedItem)
        {
            // 清空子节点集合
            if (collapsedItem.IsFolder && collapsedItem.Children != null)
            {
                // 设置当前项的所有子节点的 IsExpanded 为 false
                //SetIsExpandedForChildren(collapsedItem, false);
                Debug.WriteLine($"Children cleared for: {collapsedItem.Name}");
            }
            // 处理折叠事件（例如，清理子项、节省资源等）
        }
    }

    // 递归设置子节点的 IsExpanded 为 false
    private void SetIsExpandedForChildren(FileItem item, bool isExpanded)
    {
        foreach (var child in item.Children)
        {
            // 设置每个子项的 IsExpanded 状态
            child.IsExpanded = isExpanded;

            // 如果子项有子节点，递归处理
            if (child.IsFolder && child.Children.Count > 0)
            {
                SetIsExpandedForChildren(child, isExpanded);
            }
        }
    }
}