1 using System;
 2 using System.Collections.Generic;
 3 using System.Text;
 4 using System.Windows.Forms;
 5 using System.Drawing;
 6
 7 namespace WindowsFormsApplication1
 8 {
 9     public class DragableTabControl : TabControl
10     {
11         public DragableTabControl()
12         {
13         }
14
15         protected override void OnMouseDown(MouseEventArgs e)
16         {
17             base.OnMouseDown(e);
18             TabPage tabPage = GetTabPageByTab(new Point(e.X, e.Y));
19             if (tabPage != null)
20             {
21                 this.DoDragDrop(tabPage, DragDropEffects.All);
22             }
23         }
24
25         private TabPage GetTabPageByTab(Point point)
26         {
27             for (int i = 0; i < this.TabPages.Count; i++)
28             {
29                 if (GetTabRect(i).Contains(point))
30                 {
31                     return this.TabPages[i];
32                 }
33             }
34             return null;
35         }
36
37         protected override void OnDragOver(DragEventArgs e)
38         {
39             base.OnDragOver(e);
40             TabPage source = (TabPage)e.Data.GetData(typeof(TabPage));
41             if (source != null)
42             {
43                 TabPage target = GetTabPageByTab(PointToClient(new Point(e.X, e.Y)));
44                 if (target != null)
45                 {
46                     e.Effect = DragDropEffects.Move;
47                     MoveTabPage(source, target);
48                 }
49                 else
50                 {
51                     e.Effect = DragDropEffects.None;
52                 }
53             }
54             else
55             {
56                 e.Effect = DragDropEffects.None;
57             }
58         }
59
60         private void MoveTabPage(TabPage source, TabPage target)
61         {
62             if (source == target)
63                 return;
64
65             int targetIndex = -1;
66             List<TabPage> lstPages = new List<TabPage>();
67             for (int i = 0; i < this.TabPages.Count; i++)
68             {
69                 if (this.TabPages[i] == target)
70                 {
71                     targetIndex = i;
72                 }
73                 if (this.TabPages[i] != source)
74                 {
75                     lstPages.Add(this.TabPages[i]);
76                 }
77             }
78             this.TabPages.Clear();
79             this.TabPages.AddRange(lstPages.ToArray());
80             this.TabPages.Insert(targetIndex, source);
81             this.SelectedTab = source;
82         }
83     }
84 }