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Categories / C# / GUI Windows Form

 

Drag and drop Tree Node

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Form1 : Form {   private System.Windows.Forms.SplitContainer splitContainer1;   private System.Windows.Forms.TreeView treeOne;   private System.Windows.Forms.TreeView treeTwo;   public Form1() {         InitializeComponent();     TreeNode node = treeOne.Nodes.Add("A");     node.Nodes.Add("A1");     node.Nodes.Add("A2");     node.Expand();     node = treeTwo.Nodes.Add("B");     node.Nodes.Add("B1");     node.Nodes.Add("B2");     node.Expand();     treeTwo.AllowDrop = true;     treeOne.AllowDrop = true;   }   private void tree_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)   {     TreeView tree = (TreeView)sender;     TreeNode node = tree.GetNodeAt(e.X, e.Y);     tree.SelectedNode = node;     if (node != null)     {       tree.DoDragDrop(node, DragDropEffects.Copy);     }   }   private void tree_DragOver(object sender, System.Windows.Forms.DragEventArgs e)   {     TreeView tree = (TreeView)sender;     e.Effect = DragDropEffects.None;     TreeNode nodeSource = (TreeNode)e.Data.GetData(typeof(TreeNode));     if (nodeSource != null)     {       if (nodeSource.TreeView != tree)       {         Point pt = new Point(e.X, e.Y);         pt = tree.PointToClient(pt);         TreeNode nodeTarget = tree.GetNodeAt(pt);         if (nodeTarget != null)         {           e.Effect = DragDropEffects.Copy;           tree.SelectedNode = nodeTarget;         }       }     }   }   private void tree_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)   {     TreeView tree = (TreeView)sender;     Point pt = new Point(e.X, e.Y);     pt = tree.PointToClient(pt);     TreeNode nodeTarget = tree.GetNodeAt(pt);     TreeNode nodeSource = (TreeNode)e.Data.GetData(typeof(TreeNode));     nodeTarget.Nodes.Add((TreeNode)nodeSource.Clone());     nodeTarget.Expand();   }   private void InitializeComponent()   {         this.splitContainer1 = new System.Windows.Forms.SplitContainer();         this.treeOne = new System.Windows.Forms.TreeView();         this.treeTwo = new System.Windows.Forms.TreeView();         this.splitContainer1.Panel1.SuspendLayout();         this.splitContainer1.Panel2.SuspendLayout();         this.splitContainer1.SuspendLayout();         this.SuspendLayout();         //          // splitContainer1         //          this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;         this.splitContainer1.Location = new System.Drawing.Point(0, 0);         this.splitContainer1.Name = "splitContainer1";         //          // splitContainer1.Panel1         //          this.splitContainer1.Panel1.Controls.Add(this.treeOne);         //          // splitContainer1.Panel2         //          this.splitContainer1.Panel2.Controls.Add(this.treeTwo);         this.splitContainer1.Size = new System.Drawing.Size(456, 391);         this.splitContainer1.SplitterDistance = 238;         this.splitContainer1.TabIndex = 0;         this.splitContainer1.Text = "splitContainer1";         //          // treeOne         //          this.treeOne.Dock = System.Windows.Forms.DockStyle.Left;         this.treeOne.HideSelection = false;         this.treeOne.Location = new System.Drawing.Point(0, 0);         this.treeOne.Name = "treeOne";         this.treeOne.Size = new System.Drawing.Size(236, 391);         this.treeOne.TabIndex = 5;         this.treeOne.DragDrop += new System.Windows.Forms.DragEventHandler(this.tree_DragDrop);         this.treeOne.DragOver += new System.Windows.Forms.DragEventHandler(this.tree_DragOver);         this.treeOne.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tree_MouseDown);         //          // treeTwo         //          this.treeTwo.Dock = System.Windows.Forms.DockStyle.Fill;         this.treeTwo.Location = new System.Drawing.Point(0, 0);         this.treeTwo.Name = "treeTwo";         this.treeTwo.Size = new System.Drawing.Size(214, 391);         this.treeTwo.TabIndex = 7;         this.treeTwo.DragDrop += new System.Windows.Forms.DragEventHandler(this.tree_DragDrop);         this.treeTwo.DragOver += new System.Windows.Forms.DragEventHandler(this.tree_DragOver);         this.treeTwo.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tree_MouseDown);         //          // Form1         //          this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);         this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;         this.ClientSize = new System.Drawing.Size(456, 391);         this.Controls.Add(this.splitContainer1);         this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));         this.Name = "Form1";         this.Text = "TreeView Drag-And-Drop";         this.splitContainer1.Panel1.ResumeLayout(false);         this.splitContainer1.Panel2.ResumeLayout(false);         this.splitContainer1.ResumeLayout(false);         this.ResumeLayout(false);   }   [STAThread]   static void Main()   {     Application.EnableVisualStyles();     Application.Run(new Form1());   } }