using Syncfusion.Windows.Forms.Tools;

namespace WinFormsTreeApp
{
    public partial class Form1 : Form
    {
        private TreeViewAdv treeViewAdv1;
        
        public Form1()
        {
            InitializeComponent();
            InitializeTreeView();
        }
        
        private void InitializeTreeView()
        {
            // Create TreeViewAdv instance
            treeViewAdv1 = new TreeViewAdv();
            treeViewAdv1.Location = new System.Drawing.Point(20, 20);
            treeViewAdv1.Size = new System.Drawing.Size(300, 400);
            
            // Create nodes
            TreeNodeAdv parentNode1 = new TreeNodeAdv("Parent 1");
            TreeNodeAdv childNode1 = new TreeNodeAdv("Child 1");
            TreeNodeAdv childNode2 = new TreeNodeAdv("Child 2");
            
            // Build hierarchy
            parentNode1.Nodes.AddRange(new TreeNodeAdv[] { childNode1, childNode2 });
            
            TreeNodeAdv parentNode2 = new TreeNodeAdv("Parent 2");
            TreeNodeAdv childNode3 = new TreeNodeAdv("Child 3");
            parentNode2.Nodes.Add(childNode3);
            
            // Add root nodes
            treeViewAdv1.Nodes.AddRange(new TreeNodeAdv[] { parentNode1, parentNode2 });
            
            // Customize appearance
            treeViewAdv1.ShowLines = true;
            treeViewAdv1.ShowRootLines = true;
            treeViewAdv1.ShowPlusMinus = true;
            
            // Add to form
            this.Controls.Add(treeViewAdv1);
        }
    }
}

// Self-referencing data binding
DataTable dataTable = CreateHierarchicalData();

treeViewAdv1.DataSource = dataTable;
treeViewAdv1.DisplayMember = "Name";
treeViewAdv1.ValueMember = "ID";
treeViewAdv1.ParentMember = "ParentID";
treeViewAdv1.ChildMember = "ID";
treeViewAdv1.SelfRelationRootValue = DBNull.Value;

// Create nodes with constructor
TreeNodeAdv node = new TreeNodeAdv("Node Text");

// Set properties
node.Text = "Updated Text";
node.ShowCheckBox = true;
node.Tag = customDataObject;

// Add children
node.Nodes.Add(new TreeNodeAdv("Child"));

// Add to tree
treeViewAdv1.Nodes.Add(node);

// Setup data source
treeViewAdv1.DataSource = employeeTable;
treeViewAdv1.DisplayMember = "EmployeeName";
treeViewAdv1.ValueMember = "EmployeeID";
treeViewAdv1.ParentMember = "ManagerID";
treeViewAdv1.ChildMember = "EmployeeID";
treeViewAdv1.SelfRelationRootValue = DBNull.Value; // Root nodes have null parent

// Enable load on demand
treeViewAdv1.LoadOnDemand = true;

// Handle BeforeExpand to load children
treeViewAdv1.BeforeExpand += (sender, e) => 
{
    TreeNodeAdv node = e.Node;
    
    // Check if children already loaded
    if (node.Nodes.Count == 0)
    {
        // Load children from data source
        var children = LoadChildNodesFromDatabase(node.Tag);
        
        foreach (var child in children)
        {
            TreeNodeAdv childNode = new TreeNodeAdv(child.Name);
            childNode.Tag = child;
            node.Nodes.Add(childNode);
        }
    }
};

// Enable drag-drop
treeViewAdv1.AllowDrop = true;

// Handle ItemDrag
treeViewAdv1.ItemDrag += (sender, e) => 
{
    if (e.Item is TreeNodeAdv node)
    {
        treeViewAdv1.DoDragDrop(node, DragDropEffects.Move);
    }
};

// Handle DragDrop
treeViewAdv1.DragDrop += (sender, e) => 
{
    TreeNodeAdv sourceNode = (TreeNodeAdv)e.Data.GetData(typeof(TreeNodeAdv));
    TreeNodeAdv targetNode = treeViewAdv1.GetNodeAtPoint(treeViewAdv1.PointToClient(new Point(e.X, e.Y)));
    
    if (targetNode != null && sourceNode != targetNode)
    {
        sourceNode.Remove();
        targetNode.Nodes.Add(sourceNode);
        targetNode.Expand();
    }
};

// Enable virtualization
treeViewAdv1.EnableVirtualization = true;

// Optimize expand/collapse
treeViewAdv1.SuspendExpandRecalculate = true;
treeViewAdv1.RecalculateExpansion = false;

// Suspend layout during bulk operations
treeViewAdv1.BeginUpdate();
try
{
    // Add thousands of nodes
    for (int i = 0; i < 10000; i++)
    {
        treeViewAdv1.Nodes.Add(new TreeNodeAdv($"Node {i}"));
    }
}
finally
{
    treeViewAdv1.EndUpdate();
}