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  1. using System;
  2. using System.Collections.Generic;
  3. using System.ComponentModel;
  4. using System.Data;
  5. using System.Drawing;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows.Forms;
  9.  
  10. namespace test28
  11. {
  12.     public class TreeViewMouseOver : TreeView
  13.     {
  14.         private TreeNode overNode;
  15.         protected override void OnMouseMove(MouseEventArgs e)
  16.         {
  17.             base.OnMouseMove(e);
  18.             TreeNode n = this.GetNodeAt(this.PointToClient(Control.MousePosition));
  19.             if (n != overNode)
  20.             {
  21.                 if (overNode != null)
  22.                 {
  23.                     this.Invalidate(overNode.Bounds);
  24.                 }
  25.                 overNode = n;
  26.                 this.Invalidate(n.Bounds);
  27.             }
  28.         }
  29.         protected override void OnDrawNode(DrawTreeNodeEventArgs e)
  30.         {
  31.             if (e.Node == overNode)
  32.             {
  33.                 e.Graphics.FillRectangle(Brushes.Red, e.Bounds);
  34.             }
  35.             TextRenderer.DrawText(e.Graphics, e.Node.Text, this.Font, e.Bounds, Color.Black, TextFormatFlags.GlyphOverhangPadding);
  36.         }
  37.  
  38.     }
  39.  
  40.     public partial class Form1 : Form
  41.     {
  42.         public Form1()
  43.         {
  44.             InitializeComponent();
  45.         }
  46.  
  47.         private void Form1_Load(object sender, EventArgs e)
  48.         {
  49.             TreeViewMouseOver tv = new TreeViewMouseOver();
  50.             tv.Dock = DockStyle.Fill;
  51.             tv.DrawMode = TreeViewDrawMode.OwnerDrawText;
  52.             for (int i = 0; i < 100; i++)
  53.             {
  54.                 tv.Nodes.Add("node" + i.ToString());
  55.             }
  56.             this.Controls.Add(tv);
  57.         }
  58.     }
  59. }
  60.  
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https://ideone.com/muqJt
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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