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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.             TreeNode n = this.GetNodeAt(this.PointToClient(Control.MousePosition));
  18.             if (n != overNode)
  19.             {
  20.                 overNode = n;
  21.                 this.Invalidate();
  22.             }
  23.             base.OnMouseMove(e);
  24.         }
  25.         protected override void OnDrawNode(DrawTreeNodeEventArgs e)
  26.         {
  27.             if (e.Node == overNode)
  28.             {
  29.                 e.Graphics.FillRectangle(Brushes.Red, e.Bounds);
  30.             }
  31.             TextRenderer.DrawText(e.Graphics, e.Node.Text, this.Font, e.Bounds, Color.Black, TextFormatFlags.GlyphOverhangPadding);
  32.         }
  33.     }
  34.  
  35.     public partial class Form1 : Form
  36.     {
  37.         public Form1()
  38.         {
  39.             InitializeComponent();
  40.         }
  41.  
  42.         private void Form1_Load(object sender, EventArgs e)
  43.         {
  44.             TreeViewMouseOver tv = new TreeViewMouseOver();
  45.             tv.Dock = DockStyle.Fill;
  46.             tv.DrawMode = TreeViewDrawMode.OwnerDrawText;
  47.             for (int i = 0; i < 100; i++)
  48.             {
  49.                 tv.Nodes.Add("node" + i.ToString());
  50.             }
  51.             this.Controls.Add(tv);
  52.         }
  53.     }
  54. }
  55.  
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https://ideone.com/Qqq7l
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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